CN114934405A

CN114934405A - Whole flax straw biological matrix paper mulching film, cow dung base paper mulching film and preparation method thereof

Info

Publication number: CN114934405A
Application number: CN202210645739.2A
Authority: CN
Inventors: 赵武云; 李璐; 张锋伟; 何强; 杨向莙; 赵一鸣; 张方圆; 李安玲; 曹晓庆; 杨智凯; 韩登仑
Original assignee: Gansu Agricultural University
Current assignee: Gansu Agricultural University
Priority date: 2021-11-17
Filing date: 2022-06-09
Publication date: 2022-08-23

Abstract

The invention belongs to the technical field of agricultural application, and discloses a whole flax straw biological matrix paper mulching film, a cow dung-based paper mulching film and a preparation method thereof, wherein flax straws with 40% of fibrilia content are used as raw materials, and are pretreated; pulping the pretreated flax straws by using a Bulboli pulping machine, and measuring the pulping degree of the flax straws by using a pulping degree tester; and (3) quantitatively pulping the flax straws according to the absolute dry pulp, defibering the absolute dry pulp in a standard defibering device, and making to obtain a paper mulching film sample. The invention takes cheap agricultural and pastoral waste flax straws as raw materials, prepares the full flax straw biological matrix paper mulching film with better chemical performance, has simple process and simple and convenient operation, and has the advantages of low cost, strong repeatability, high yield, degradability, no pollution, good air permeability, easy pilot-scale production and the like.

Description

Whole flax straw biological matrix paper mulching film, cow dung base paper mulching film and preparation method thereof

Technical Field

The invention belongs to the technical field of agricultural application, and particularly relates to a whole flax straw biological matrix paper mulching film and a preparation method thereof.

Background

At the end of the 70 s, the 'plastic film mulching cultivation' technology introduced in China creates a favorable small ecological environment for the growth of crops, and achieves the purposes of preserving soil moisture and water, accumulating temperature and killing weeds. The accumulated economic yield increase value brought by the application of the technology is over 800 billion yuan, but the technology causes serious pollution to soil. The polymer plastic mulching film is mostly used in the farmland at present, and plastic residues in the polymer plastic mulching film cannot be degraded in soil for decades, so that the soil is hardened, the air permeability is reduced, the growth and development of crops are influenced, and the yield of the crops is reduced. According to statistics, the usage amount of agricultural plastic mulching films in China is the first in the world and is 1.6 times of the total usage amount of agricultural plastic mulching films in other countries.

Therefore, the research of the degradable mulching film draws great attention at home and abroad, and at present, the research mainly focuses on the aspects of the photodegradable mulching film, the photodegradable/biodegradable mulching film, the plant fiber mulching film and the like:

the light degradation mulching film and the light/biological dual degradation mulching film: at present, China reaches the level of large-scale production, but both the problems exist, namely, after photolysis or biodegradation, the mulching film can only be degraded into small particles, and with the prolonging of the service time, plastic particles in soil are gradually accumulated and are difficult to remove, so that more serious pollution is brought than that caused by the use of the plastic mulching film.

And (3) biodegradable mulching film: mainly divided into two categories, natural polymer-based mulching film and chemically synthesized polymer-based mulching film. The natural polymer-based mulching film is mainly a starch-based mulching film, the degradability of the natural polymer-based mulching film is limited to the starch part of the natural polymer-based mulching film, and the plastic component of the natural polymer-based mulching film cannot be degraded, so that the natural polymer-based mulching film is an incomplete biodegradable film. At present, degradable Polycaprolactone (PCL) synthetic polymer is utilized in the United states to produce chemically synthesized high-molecular biodegradable mulching films of different grades. French researches are mostly carried out on polyester mulching films and starch and polyester mixed mulching films at present, raw materials of the polyester mulching films mainly come from petroleum products, and starch mainly adopts corn starch. In Japan, cellulose and chitin aqueous solution are used for preparing films. In germany amylose or high amylose starch and other natural high molecular weight materials are used to make films. Although these films are degradable, they have problems of difficult processing, poor mechanical properties and water resistance, and difficult popularization and application.

Plant fiber mulching film: the mulching film is prepared by using plant fiber as a raw material, adding auxiliary agents such as a wet strength agent, a preservative, a transparent agent and the like into paper pulp, making base paper by adopting a papermaking process, and then processing the base paper. According to reports, research units in northeast, northHu, Xinjiang and the like of China develop and develop the paper mulching film, but most of the paper mulching film is in an experimental stage, and the paper mulching film is not popularized and popularized due to the problems of cost and some technical indexes. A series of paper mulching film products are researched and developed in Japan at present, but the problems of dry and wet strength, breaking strength, degradability and the like of the paper mulching film still need to be solved.

In consideration of the wide application of agricultural mulching films, a preparation method of a mulching film which is controllable in cost, excellent in performance, completely degradable and harmless to soil is urgently needed.

Through the above analysis, the problems and defects of the prior art are as follows:

(1) the photodegradable mulching film and the photodegradable/biological double-degradable mulching film are agricultural mulching films with good degradation effect, but in order to improve the related performance, chemical reagents such as photosensitizer and the like are added in the process of preparing the paper film, in the degradation process, the degradable mulching film can not completely ensure whether the degraded small particles can generate negative influence on the structure and performance of soil and the growth of crops, and the photodegradable mulching film is carried out under the illumination condition, so that part of the mulching film buried in the soil can not be degraded, and the long-time use and accumulation can generate certain influence on the structure and the property of the soil, thereby influencing the healthy development of agriculture.

(2) The natural polymer-based mulching film in the biodegradable mulching film is mainly a starch-based mulching film, and tests show that the degradable part is only starch, so that the natural polymer-based mulching film is a mulching film which is not completely degradable, and certain environmental problems are inevitably caused. The existing chemical synthesis polymer-based mulching film is added with a polymer material in the preparation process, the component can possibly remain in soil for a long time and even be absorbed by roots and stems of crops, the residue of the component cannot be guaranteed not to threaten the life of human beings, and along with the long-term large-scale use of the mulching film, more and more residues in the soil have certain influence on the structure and microorganisms of the soil, so that the development of the environment and agriculture is influenced.

(3) The pure plant fiber mulching film is a green and environment-friendly degradable mulching film theoretically, but the prior art is not mature enough, the preparation cost is higher than that of a plastic mulching film, especially waste liquid generated in the early treatment of straws can cause serious pollution to the environment, and the pure plant fiber mulching film serving as a degradable agricultural mulching film has mechanical properties which cannot meet the relevant strength requirement of the plastic mulching film, is not obvious in heat preservation and moisture preservation effects, and is uncontrollable in degradability and degradation time.

(4) The existing photodegradation mulching film and the existing photodegradation/biodegradation mulching film can only degrade the mulching film into small particles after photodegradation or biodegradation, and along with the prolonging of the service time, plastic particles in soil are gradually accumulated and are difficult to remove, so that the pollution is more serious than that caused by using the plastic mulching film.

(5) In the existing biodegradable mulching film, the natural polymer-based mulching film is mainly a starch-based mulching film, the degradability of the natural polymer-based mulching film is limited to the starch part of the natural polymer-based mulching film, and the plastic components in the natural polymer-based mulching film cannot be degraded, so that the natural polymer-based mulching film is an incomplete biodegradable film; the existing chemical synthesis polymer-based mulching films have the problems of difficult processing, poor mechanical property and poor water resistance, and are difficult to popularize and apply.

(6) Most of the existing plant fiber mulching films are in an experimental stage, the mulching films are not popularized and popularized due to the problems of cost and some technical indexes, and the problems of dry and wet strength, breaking strength, degradability and the like of the researched and developed paper mulching film products still need to be solved.

The difficulty in solving the above problems and defects is:

the difficulty in solving the problems and the defects mainly focuses on the problems that the completeness of degradation in the use process of the degradable mulching film, the actual influence on soil and environment, the difficulty in controlling the cost, the difficulty in controlling the degradation time, the use performance, the recognition degree of farmers and the like are difficult to judge.

The plastic mulching film is mainly used in rural areas in China, in recent years, the usage amount of the plastic mulching film gradually increases at the rate of tens of thousands of tons every year, and other types of degradable mulching films have the characteristics of incomplete degradation, micro plastic residue, poor service performance, high cost and the like.

The significance of solving the problems and the defects is as follows:

experiments prove that the plant fiber film can achieve the effect of complete degradation, the plant fiber mulching film is purely natural plant fiber, no obvious negative influence is caused on the environment, and the application in the straw returning technology can sufficiently show that the straw can be used as a fertilizer, so that the completely degradable environment-friendly straw mulching film with controllable cost and meeting the use performance is prepared, the environmental problem can be solved, the healthy and rapid development of agriculture is promoted, the living standard of people is improved, and the sustainable development of social economy is promoted.

The full-biological matrix degradable mulching film can thoroughly solve the problems of white pollution and micro-plastic residue, protect the agricultural ecological environment, is a development trend of the mulching film industry in China in future and is also a necessary prerequisite for developing sustainable agriculture.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a whole flax straw biological matrix paper mulching film and a preparation method thereof.

The invention is realized in such a way that the whole flax straw biological matrix paper mulching film is prepared by taking 90-100% of flax straw and 0-10% of a small amount of waste paper pulp as auxiliaries according to the mass percentage.

The invention also aims to provide a preparation method of the whole-flax straw bio-matrix paper mulching film, which comprises the following steps:

firstly, flax straws with 40 percent of fibrilia content are taken as raw materials, and the flax straws with 40 percent of fibrilia content are pretreated;

secondly, pulping the pretreated flax straws by using a Wahler pulping machine, and measuring the pulping degree of the flax straws by using a pulping degree tester;

and step three, quantitatively pulping the flax straws according to absolute dry pulp, defibering the absolute dry pulp in a standard defibering device, and making to obtain paper mulching film sample sheets.

And step four, proportioning the pulped flax straws and waste paper pulp according to the mass percent of the waste paper pulp after the flax straws and the waste paper pulp are quantified, defibering the mixed waste paper pulp in a standard defibering device, and making paper mulching film sample sheets.

Further, in the step one, the pretreatment of the flax straws with the fibrilia content of 40% comprises the following steps:

(1) cutting flax straws with the fibrilia content of 40% into short straws of 2cm, weighing, adding plant ash accounting for 25% -35% of the weight of the straws, and placing in an electric heating cooking pot for cooking;

(2) washing the boiled flax straws with water, drying in a drying oven at a conventional drying temperature, weighing the flax straw absolute dry material according to the mass ratio of 1.3-1.7% of the flax straw absolute dry material to the pulping clear water, and soaking the flax straw absolute dry material overnight;

(3) slowly adding all the pulp and water for soaking the pulp according to the concentration of 1.3-1.7% until the total volume of the pulp and the water reaches above the lowest allowable working volume of the wary beater;

(4) a bottom knife is selected to untwist the slurry for 30min-45min, so that the slurry is fully dissociated;

(5) pulping the dissociated pulp, and respectively making the pulped flax straw pulp into flax straw pulp boards by adopting a paper sheet former.

Furthermore, the capacity of the Valley beater is 23L, and the capacity of the electric heating digester is 15L.

Further, the beating concentration is 1.3-1.7%, the defibering time is 30-45 min, the beating load is 2.5-4.5kg, the beating time is 90-180 min, the beating degree is 73-90 DEG SR, and the paper sheet forming and drying temperature is 80-90 ℃.

Further, in the step one, the pretreatment of the flax straws with the fibrilia content of 40% further comprises the following steps:

(1) cutting flax straws with the flax fiber content of 40 percent into short straws of 2cm, weighing, adding plant ash with the weight of 25 to 35 percent of that of the straws, and cooking in an electric heating cooking pot;

(2) in the cooking process, when the temperature rises to 120 ℃ and the corresponding pressure is 0.2MPa-0.3MPa, opening the air release valve, closing the air release valve when the pressure gauge returns to the zero position, continuing cooking until the temperature rises to the set temperature, and then preserving heat.

Furthermore, the cooking temperature of the flax straws is 160-170 ℃, the cooking pressure is not more than 0.8MPa, and the heat preservation time is 30-60 min.

Further, in the third step, the thickness of the paper mulching film is 0.098mm-0.15mm, and the gram weight is 40g/m ² -70g/m ² The tensile strength is 16.20MPa to 27.62MPa, and the tearing strength is 19.81kN/m to 40.24 kN/m.

Further, the preparation method of the whole flax straw bio-matrix paper mulching film further comprises the following steps:

(1) tearing flax straw pulp board with beating degree of 73-90 DEG SR and waste paper into small pieces, mixing according to the mass percentage of flax straw containing 100%, 95% and 90%, the thickness of the formed paper film is 0.098mm-0.15mm, and the gram weight is 40g/m ² -70g/m ² ；

(2) Thoroughly soaking flax straw pulp board and waste paper in a certain proportion in water at room temperature for more than 6h, stirring with magnetic stirrer for more than 1h, defibering in standard defibering device, and making into paper with thickness of 0.098-0.15 mm and gram weight of 40g/m ² -70g/m ² The paper mulching film sample sheet has paper sheet forming and drying temperature of 80-90 ℃.

(1) tearing flax straw pulp board with beating degree of 89.5 degree SR and waste paper into small pieces, and mixing according to the ratio of flax straw containing 100%, 95% and 90% by massThe thickness of the molded paper film is 0.098mm-0.15mm, and the gram weight is 40g/m ² -70g/m ² ；

(2) Contains flax straw 100%, 95% and 90% by mass, and has a thickness of 0.098-0.15 mm and a gram weight of 40g/m ² -70g/m ² The tensile strength of the paper mulching film is 16.20MPa to 27.62MPa, and the tearing strength is 19.81kN/m to 40.24 kN/m.

The invention also aims to provide a cow dung-based full-biological matrix paper mulching film which consists of 5-75% of flax straws and 100% of cow dung in percentage by mass, wherein the cow dung is the rest.

Further, the cow dung-based full-biological matrix paper mulching film is prepared from 50% of hemp and 50% of cow dung in percentage by mass.

The invention also aims to provide a preparation method of the cow dung-based full-biological matrix paper mulching film, which comprises the following steps:

taking cow dung and flax straws with the fibrilia content of 40% as raw materials, and pretreating the cow dung and the flax straws with the fibrilia content of 40%;

pulping the pretreated cow dung and the flax straws by using a Wahler pulping machine, and respectively measuring the pulping degree of the cow dung and the pulping degree of the flax straws by using a pulping degree measuring instrument;

and thirdly, quantitatively proportioning the pulped cow dung and the flax straws according to the absolute dry weight, proportioning according to the mass percent of the flax straws of 5-75%, defibering the mixed absolute dry pulp in a standard defibering device, and making into a paper mulching film sample sheet.

Further, in the step one, the pretreatment of the cow dung comprises the following steps:

(1) separating manure and water from cow dung in a mechanical extrusion mode, and separating dry substances in the cow dung;

(2) weighing the separated dry cow dung, adding plant ash accounting for 10-20% of the mass of the cow dung, and soaking the mixture of the cow dung and the plant ash for more than 10 hours by using clear water;

(3) washing the mixture of the cow dung and the plant ash for a plurality of times by water, and washing sand and sandy soil impurities in the cow dung;

(4) drying the cleaned cow dung in an oven at the drying temperature of 60-90 ℃, weighing a cow dung absolute dry material according to the mass ratio of 3-4% of the cow dung absolute dry mass to the pulping clear water, and thoroughly soaking the cow dung absolute dry material for more than 4 hours;

(5) slowly adding all the pulp and water for soaking the pulp according to the concentration of 3-4% until the total volume of the pulp and the water reaches above the lowest allowable working volume of the wary beater;

(6) a bottom knife is selected to untwist the slurry for 5min to 30min so that the slurry is fully dissociated;

(7) pulping the dissociated pulp, wherein the pulping load is 1.5kg-2.5kg, the pulping time is 60min-180min, and the pulping degree is measured to be 30-49 DEG SR by adopting a pulping degree tester;

(8) and (3) respectively manufacturing the cow dung slurry with the beating degree of 30-49 DEG SR into cow dung slurry plates by adopting a paper forming device, wherein the paper forming and drying temperature is 80-100 ℃.

(1) cutting flax straws with the flax fiber content of 40% into short straws of 2cm, weighing, adding plant ash accounting for 25% -35% of the weight of the straws, and placing the straws in an electric heating cooking pot for cooking;

(2) washing the boiled flax straws with water, drying in an oven at a conventional drying temperature, weighing absolute dry flax straw materials according to the mass ratio of the absolute dry flax straws to pulping clear water of 1.3-1.7%, and soaking the absolute dry flax straw materials overnight;

(3) slowly adding all the pulp and water for soaking the pulp according to the concentration of 1.3-1.7 percent until the total volume of the pulp and the water reaches above the lowest allowable working volume of the wary beater;

(5) pulping the dissociated pulp, wherein the pulping load is 2.5kg-4.5kg, the pulping time is 90min-180min, and the pulping degree is measured to be 73-90 DEG SR by adopting a pulping degree tester;

(6) respectively manufacturing the flax straw pulp with the beating degree of 73-90 DEG SR into the flax straw pulp boards by adopting a paper sheet former, wherein the paper sheet forming and drying temperature is 80-90 ℃.

Further, in the step one, the pretreatment of the flax straws with the flax fiber content of 40% also comprises the following steps:

(1) cutting flax straws with the fibrilia content of 40% into short straws of 2cm, weighing, adding plant ash accounting for 25% -35% of the weight of the straws, and steaming in an electric heating cooking pot;

(2) the cooking temperature is set to be 160-170 ℃, the cooking pressure is not more than 0.8MPa, and the heat preservation time is 30-60 min;

(3) in the cooking process, when the temperature rises to 120 ℃ and the corresponding pressure is about 0.2MPa-0.3MPa, the air release valve is opened, the air release valve is closed when the pressure gauge returns to the zero position, and the cooking is continued until the temperature rises to the set temperature and then the temperature is preserved.

Further, in the second step, the capacity of the wary beater is 23L, the capacity of the electric heating digester is 15L, and the addition amount of the plant ash is 25% -35% of the total mass of the materials.

The pulping concentration of the cow dung is 3-4%, the defibering time is 5-30 min, the pulping load is 1.5-2.5 kg, the pulping time is 60-180 min, the pulping degree is 30-49 DEG SR, and the forming and drying temperature of paper sheets is 80-100 ℃.

The flax straw cooking temperature is 160-170 ℃, the cooking pressure is not more than 0.8MPa, the heat preservation time is 30-60 min, the pulping concentration is 1.3-1.7%, the defibering time is 30-45 min, the pulping load is 2.5-4.5kg, the pulping time is 90-180 min, the pulping degree is 73-90 DEG SR, and the paper sheet forming and drying temperature is 80-90 ℃.

Further, in the third step, the paper mulching film contains 75% of flax straws, 50% of flax straws, 25% of flax straws, 10% of flax straws and 5% of flax straws, the thickness of the paper mulching film is 0.108-0.23 mm, and the gram weight of the paper mulching film is 22g/m ² -70g/m ² The tensile strength is 0.32MPa to 15.01MPa, and the tearing strength is 1.05kN/m to 26.97 kN/m.

Further, the preparation method of the cow dung-based full-biological matrix paper mulching film further comprises the following steps:

(1) tearing a cow dung pulp board with the beating degree of 30-49 DEG SR and a flax straw pulp board with the beating degree of 73-90 DEG SR into small pieces, and mixing according to the mass percentage of 75%, 50%, 25%, 10% and 5% of flax straws, wherein the thickness of a formed paper film is 0.108-0.23 mm, and the gram weight is 22g/m ² -70g/m ² ；

(2) Thoroughly soaking the mixed pulp board of cow dung pulp board and flax straw pulp board in a ratio for more than 6h at room temperature with water, stirring for more than 1h with a magnetic stirrer, defibering on a standard defibering device, and respectively making into pulp with thickness of 0.108-0.23 mm and gram weight of 22g/m with a paper former ² -70g/m ² The paper sheet of the paper mulching film sample sheet is formed and dried at the temperature of 80-90 ℃.

(1) tearing a cow dung pulp board with the beating degree of 49 DEG SR and a flax straw pulp board with the beating degree of 89.5 DEG SR into small pieces, and proportioning according to the mass percent of flax straws of 75%, 50%, 25%, 10% and 5%, wherein the thickness of the formed paper film is 0.108-0.23 mm, and the gram weight is 22g/m ² -70g/m ² ；

(2) Contains 75 percent, 50 percent, 25 percent, 10 percent and 5 percent of flax straws by mass, the thickness is 0.108mm-0.23mm, and the gram weight is 22g/m ² -70g/m ² The tensile strength of the paper mulching film is 0.32MPa-15.01MPa, and the tearing strength is 1.05kN/m-26.97 kN/m.

The invention also aims to provide a whole-flax straw biological matrix paper mulching film which is prepared by taking 90-100% of flax straws and 0-10% of cotton pulp oven-dried pulp as auxiliary agents in percentage by mass.

The invention also aims to provide a preparation method of the whole flax straw bio-matrix paper mulching film, which comprises the following steps:

And step four, proportioning the pulped flax straws and cotton pulp according to 0-10% of the absolute dry pulp mass percent after the absolute dry pulp is quantified, defibering the mixed absolute dry pulp in a standard defibering device, and pulping to obtain a paper mulching film sample sheet.

Further, in the step one, the pretreatment of the flax straws with the flax fiber content of 40% comprises the following steps:

(2) washing the boiled flax straws with water, drying the flax straws in an oven at a conventional drying temperature, weighing absolute dry flax straw materials according to the mass ratio of 1.3-1.7% of absolute dry flax straws to pulping clear water, and soaking the absolute dry flax straws overnight;

(1) tearing the flax straw pulp board with the beating degree of 73-90 DEG SR into small pieces, mixing the small pieces with cotton pulp oven dry pulp according to the mass percent of 100%, 95% and 90% of flax straw, and forming the paper film with the thickness of 0.100-0.122 mm and the gram weight of 40g/m ² -70g/m ² ；

(2) Thoroughly soaking flax straw pulp board and cotton pulp oven-dried pulp in a certain proportion in water at room temperature for more than 6h, stirring with magnetic stirrer for more than 1h, defibering in standard defibering device, and making into paper sheets with thickness of 0.100-0.122 mm and weight of 40g/m ² -70g/m ² The paper sheet of the paper film sample sheet is formed and dried at the temperature of 80-90 ℃.

(1) tearing the flax straw pulp board with the beating degree of 89.5 DEG SR into small pieces, mixing the small pieces with cotton pulp absolute dry pulp according to the mass percentage of 100 percent, 95 percent and 90 percent of flax straw, wherein the thickness of the formed paper film is 0.100mm-0.122mm, and the gram weight is 40g/m ² -70g/m ² ；

(2) Contains flax straw 100%, 95% and 90% by mass, has a thickness of 0.100-0.122 mm and a gram weight of 40g/m ² -70g/m ² The tensile strength of the paper mulching film is 16.16MPa-27.36MPa, and the tearing strength is 18.92kN/m-37.16 kN/m.

By combining all the technical schemes, the invention has the advantages and positive effects that: the invention provides a whole flax straw biological matrix paper mulching film, which takes cheap agricultural and pastoral waste flax straws as raw materials and selects a proper pretreatment method to treat the flax straws; pulping flax straws, and making a paper mulching film by using a simplified paper making process for reference; important influencing factors and reaction conditions are optimized, and the full flax straw bio-matrix paper mulching film with better chemical performance is manufactured. The raw materials of the invention are cheap agricultural and pastoral wastes, the process is simple, the operation is simple and convenient, the advantages of low cost, strong repeatability, high yield, large yield, easy pilot scale production and the like are achieved, the prepared whole flax straw bio-matrix paper mulching film has no negative influence on the environment after being degraded, has no pollution to the soil, is a green and environment-friendly fertilizer, and provides theoretical basis for industrial production and practical application.

The invention efficiently utilizes waste straw resources and reduces the pollution caused by straw burning; residual mulching films do not need to be recycled, degradation begins to occur in about 90 days, and the degraded mulching films not only have no pollution to soil, but also can be used as efficient fertilizers, so that excessive use of fertilizers is avoided; waste paper pulp is added as an auxiliary agent, so that the service performance of the mulching film is ensured, waste paper and garbage resources can be effectively utilized, the renewable and recyclable environment protection is met, and the occupation of precious land resources by garbage landfill is reduced; the cotton pulp is added as an auxiliary agent, so that the use performance of the mulching film is ensured, waste cotton resources can be effectively utilized, the cotton velvet has high transparency, toughness, folding resistance, softness and good absorption performance, has good air permeability, does not burn crops, has good weed removing effect, and can reduce the use amount of chemical pesticides; the usage amount of the polyethylene mulching film is reduced, and the problem of white pollution is solved; can be applied to the planting of high value-added economic crops.

The cow dung-based full-biological matrix paper mulching film provided by the invention takes cheap farming and pasturing wastes (cow dung and hemp straw) as raw materials, disinfects and cleans the cow dung, separates the manure and water by a mechanical extrusion mode, and separates dry substances in the cow dung; selecting a proper pretreatment method to treat the cow dung and the flax straws; pulping cow dung and flax straws, and making a paper mulching film by using a simplified papermaking process for reference; important influencing factors and reaction conditions are optimized, and the cow dung-based full-biological matrix paper mulching film with better chemical performance is manufactured. The raw materials of the invention are cheap agricultural and pastoral wastes, no chemical auxiliary agent is used, the process is simple, the operation is simple and convenient, the invention has the advantages of low cost, strong repeatability, high yield, large yield, easy pilot-scale production and the like, the prepared cow dung-based all-biological matrix paper mulch starts to degrade in about 70 days, and becomes good fertilizer after degradation, thereby providing theoretical basis for industrialization of the mulch.

The invention carries out resource utilization on the livestock and poultry manure, and solves the problem of solid manure pollution in livestock and poultry farms; the waste crop straws are effectively utilized, and the pollution caused by straw burning is reduced; residual mulching films do not need to be recycled, the mulching films begin to be degraded at about 70 degrees, and after complete degradation, the product is a high-quality organic fertilizer with good fertilizer efficiency, the soil matrix is improved, and excessive use of chemical fertilizers and pesticides is avoided; has good weed removing effect; the crop yield can be increased; the usage amount of the polyethylene mulching film is reduced, and the problem of white pollution is solved; the cow dung-based full-biological matrix paper mulching film is explored and tested in the aspects of seedling raising, pollution-free vegetable planting and organic planting, and the income of farmers can be increased.

In conclusion, the invention can improve the utilization value of agricultural and pastoral wastes, so that the agriculture can be developed in a green and sustainable healthy way, and is a necessary trend for constructing a resource environment harmonious development and a circular economy type society, and the trend is closely combined with the aims of responding to ' implementation opinions about the agriculture department on fighting against solid and solid by making agricultural non-point source pollution control ' (the total application amount of chemical fertilizers and pesticides is reduced) and ' three basic ' (the livestock and poultry manure, the agricultural film and the crop straws are basically recycled, comprehensively recycled and harmlessly treated) ', wherein the results of preparing the paper mulching film by taking the cow manure and the flax straws as raw materials are never reported.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a flow chart of a preparation method of the whole flax straw bio-matrix paper mulching film provided by the embodiment of the invention.

Fig. 2 is a photograph of the flax straw pre-treated with 40% flax fiber in the raw material of the whole flax straw bio-matrix paper mulching film and the preparation method thereof provided by the embodiment of the invention.

Fig. 3 is a photograph of a sample of the mulching film made of the whole flax straw bio-matrix paper according to the embodiment of the present invention.

Fig. 4 is a stress-strain curve of the prepared whole flax straw bio-matrix paper mulch film when stretched, which is provided by the embodiment 1 of the invention. The stress varied with the amount of strain, and when the amount of strain was about 0.030%, the sample broke and the breaking strength was 27.62 Mpa.

Fig. 5 is a load-displacement curve diagram when the mulching film of the prepared whole flax straw bio-matrix paper provided by the embodiment 1 of the invention is torn. Along with the movement of the loading machine, the loading load is continuously increased, when the load reaches a certain value, the right angle of the sample is torn, and the maximum tearing load is 2.92N.

FIG. 6 is a stress-strain curve diagram of the whole flax straw bio-matrix paper mulch film provided in example 4 of the present invention when stretched; the stress varied with the strain amount, and the sample was broken at a constant stress due to the low elasticity of the sample, and the tensile breaking strength was 19.74 MPa.

Fig. 7 is a schematic view of a load-displacement curve when the mulching film of the whole flax straw bio-matrix paper provided in embodiment 4 of the present invention is torn. The loading load is increased continuously along with the movement of the loading machine tool, when the load reaches a certain value, the right angle of the test sample is torn, and the maximum tearing load is 4.49N.

Fig. 8 is a flow chart of a preparation method of the cow dung-based full-biological matrix paper mulching film provided by the embodiment of the invention.

FIG. 9 is a photograph of cow dung after being pretreated in the cow dung-based full biological matrix paper mulch raw material provided by the invention.

Fig. 10 is a photograph of flax straw containing 40% of hemp fiber in the raw material of the cow dung-based full-biological matrix paper mulching film provided by the invention.

FIG. 11 is a photograph showing a sample of a prepared cow dung-based full-bio matrix paper mulch film.

Figure 12 is a thickness of a sample of prepared cow dung-based full bio-matrix paper mulch film (micrometer screw) provided by example 6 of the present invention.

Fig. 13 is a stress-strain curve of the cow dung-based total bio-matrix paper mulch film provided in example 6 of the present invention when stretched. The stress changes with the change of the strain quantity, and because the elastic property of the sample is small, when the dependent variable is about 0.033 percent, a stress peak value appears, the sample is broken by pulling, and the tensile breaking strength is 12.99 MPa.

FIG. 14 is a graph of load-displacement curve when the cow dung-based full bio-matrix paper mulch film provided by the embodiment 6 of the invention is torn. Along with the movement of the loading machine, the loading load is increased continuously, when the load reaches a certain value, the right angle of the test sample is torn, and the maximum tearing load is 4.09N.

FIG. 15 shows the grammage (mass of single sample, 0.0314m area) of a prepared cow dung-based total biological matrix paper mulch film sample provided in example 8 of the present invention ² )。

Fig. 16 is a stress-strain curve diagram of the cow dung-based full bio-matrix paper mulch film provided in example 9 of the present invention when stretched. The stress changes with the constant change of the strain amount, and the elastic property of the sample is small, so that the sample is broken when the stress reaches a certain value, and the tensile breaking strength is 19.93 Mpa.

Fig. 17 is a schematic view of a load-displacement curve when the cow dung-based full biological matrix paper mulching film provided by the embodiment 9 of the invention is torn. The loading load is continuously increased along with the movement of the loading machine tool, when the load reaches a certain value, the right angle of the test sample is torn, and the maximum tearing load is 2.82N.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not delimit the invention.

Aiming at the problems in the prior art, the invention provides a whole flax straw biological matrix paper mulching film and a preparation method thereof, and the invention is described in detail below with reference to the accompanying drawings.

The whole flax straw biological matrix paper mulching film provided by the embodiment of the invention is prepared by taking 90-100% of flax straw and 0-10% of a small amount of waste paper pulp as an auxiliary agent.

As shown in fig. 1, the preparation method of the whole flax straw bio-matrix paper mulching film provided by the embodiment of the invention comprises the following steps:

s101, flax straws with 40% of fibrilia content are used as raw materials, and the flax straws with 40% of fibrilia content are pretreated.

S102, pulping the preprocessed flax straws by using a Warley beater, and determining the beating degree of the flax straws by using a beating degree determinator. The specific parameters are as follows: the slurry is defibered for 40min by selecting a bed knife, the pulping load is selected to be 2.5kg, the pulping is carried out for 60min, the pulping load is increased to be 3.0kg, the pulping is continued for 30min, and the pulping degree of the slurry is 73 DEG SR; the slurry is defibered for 45min by selecting a bed knife, the pulping load is selected to be 2.5kg, the pulping is carried out for 60min, the pulping load is increased to be 3.0kg, the pulping is continued for 30min, the pulping load is increased to be 4.0kg, the pulping is continued for 15min, and the pulping degree of the slurry is 80 DEG SR; and (3) selecting a bed knife to untwist the pulp for 40min, selecting the pulping load of 2.5kg, pulping for 75min, then adding the pulping load to 4.5kg, and continuing pulping for 45min to obtain the pulp with the pulping degree of 89.5 DEG SR.

S103, quantifying the pulped flax straws according to the oven-dried pulp, defibering the oven-dried pulp in a standard defibering device, and making to obtain a paper mulching film sample.

S104, proportioning the pulped flax straws and waste paper pulp according to the mass percent of 0-10% of the waste paper pulp after quantifying the absolute dry pulp, defibering the mixed absolute dry pulp in a standard defibering device, and making paper mulching film sample pieces.

In step S101, the pretreatment of the flax straws with a fibrilia content of 40% comprises:

(2) washing the boiled flax straws with water, drying the flax straws in an oven at a conventional temperature, weighing absolute dry flax straw materials according to the mass ratio of 1.3-1.7% of absolute dry flax straws to pulping clear water, and soaking the absolute dry flax straws overnight;

The capacity of the Valley beater is 23L, and the capacity of the electric heating digester is 15L.

The beating concentration is 1.3-1.7%, the defibering time is 30-45 min, the beating load is 2.5-4.5kg, the beating time is 90-180 min, the beating degree is 73-90 DEG SR, and the paper sheet forming and drying temperature is 80-90 ℃.

In step S101, the pretreatment of the flax straws with a fibrilia content of 40% further comprises:

The cooking temperature of the flax straws is 160-170 ℃, the cooking pressure is not more than 0.8MPa, and the heat preservation time is 30-60 min.

In step S103, the thickness of the paper mulching film is 0.098mm-0.15mm, and the gram weight is 40g/m ² -70g/m ² The tensile strength is 16.20MPa to 27.62MPa, and the tearing strength is 19.81kN/m to 40.24 kN/m.

In step S104, the preparation method of the whole flax straw bio-matrix paper mulch film further comprises:

In the embodiment of the invention, the preparation method of the whole flax straw bio-matrix paper mulching film further comprises the following steps:

(1) tearing flax straw pulp board with beating degree of 89.5 degree SR and waste paper into small pieces, mixing according to the mass percentage of flax straw containing 100%, 95% and 90%, the thickness of formed paper film is 0.098mm-0.15mm, and the gram weight is 40g/m ² -70g/m ² ；

(2) Contains flax straw 100 wt%, flax straw 95 wt%, flax straw 90 wt%, flax straw 0.098-0.15 mm in thickness and flax straw 40g/m in gram weight ² -70g/m ² The tensile strength of the paper mulching film is 16.20MPa to 27.62MPa, and the tearing strength is 19.81kN/m to 40.24 kN/m.

The technical solution of the present invention is further described with reference to the specific embodiments.

Example 1

1. Flax straws with 40 percent of fibrilia content are used as raw materials.

2. Flax straws with the fibrilia content of 40 percent are cut into short straws of about 2cm and weighed, and plant ash with the weight of 25 percent of the straws is added to be cooked in an electric heating cooking pot (TD1-15 type). Setting the cooking temperature at 160 ℃, keeping the temperature for 30min, opening the air release valve when the temperature rises to about 120 ℃, closing the air release valve when the pressure gauge returns to the zero position, continuing to cook, and keeping the temperature after the temperature rises to 160 ℃.

3. Washing the boiled flax straws with water, drying, weighing 280g of flax straw absolute dry material, weighing 17L of clear water, soaking the flax straw absolute dry material overnight, and adding all the pulp and the water for soaking the pulp into a Wali beater (type TD 6-23).

4. And (4) selecting a bottom knife to untwist the slurry for 40min so as to fully dissociate the slurry. Pulping the dissociated pulp with a pulping load of 2.5kg and a pulping time of 75min, changing the pulping load to 4.5kg and a pulping time of 45min, and determining the pulping degree to be 89.5 DEG SR by adopting a pulping degree tester (TD 9-M).

5. The flax straw pulp with the beating degree of 89.5 DEG SR is made into flax straw pulp boards by a paper former (TD10-200 type), and the paper forming and drying temperature is 80 ℃.

6. Soaking flax straw pulp board 1.65g with beating degree of 89.5 ° SR thoroughly with water at room temperature for more than 6h, stirring with magnetic stirrer (85-2 type constant temperature magnetic stirrer) for more than 1h, defibering in standard fluffer (TD15-A type, rotation number 20000r, stirrer rotation speed 2900 + -100 r/min), and making into sheet with paper former with gram weight of 51.59g/m ² The paper sheet of the paper mulching film sample is formed and dried at the temperature of 90 ℃.

7. The gram weight of the formed paper film is 51.59g/m ² The tensile strength was 27.62MPa, and the tear strength was 25.81 kN/m.

The photo of the pretreated flax straws containing 40% of flax fibers in the raw materials is shown in fig. 2, the full-view photo of the prepared flax straw bio-matrix paper mulching film is shown in fig. 3, the stress-strain curve of the prepared flax straw bio-matrix paper mulching film in the stretching process is shown in fig. 4, and the load-displacement curve of the prepared flax straw bio-matrix paper mulching film in the tearing process is shown in fig. 5.

Example 2

1. Flax straws with 40 percent of fibrilia content are used as raw materials.

2. Flax straws with the fibrilia content of 40 percent are cut into short straws of about 2cm and weighed, and plant ash with the mass of 30 percent of the straws is added into an electric heating cooking pot for cooking. The cooking temperature is set to be 160 ℃, the heat preservation time is 30min, when the temperature rises to about 120 ℃, the air release valve is opened, the air release valve is closed when the pressure gauge returns to the zero position, and the heat preservation is carried out after the temperature is continuously cooked and rises to 160 ℃.

3. Cleaning and cooking flax straws with water, drying, weighing 260g of absolute dry flax straw, weighing 17L of clean water, soaking the absolute dry flax straw overnight, and adding all the pulp and the water for soaking the pulp into a Waley pulping machine.

4. And (4) selecting a bottom knife to untwist the slurry for 40min so as to fully dissociate the slurry. And (3) starting pulping the dissociated pulp, wherein the pulping load is 2.5kg, the pulping time is 75min, the pulping load is changed to 4.5kg, the pulping time is 45min, and the pulping degree is determined to be 89.5 DEG SR by adopting a pulping degree tester.

5. And (3) pulping the flax straw pulp with the beating degree of 89.5 DEG SR into a flax straw pulp board by adopting a paper sheet former, wherein the paper sheet forming and drying temperature is 85 ℃.

6. Soaking 2.1g of flax straw pulp board with beating degree of 89.5 ° SR in water at room temperature for more than 6 hr, stirring with magnetic stirrer for more than 1 hr, defibering in standard defibering device, and making into paper with a sheet former with a gram weight of 65.92g/m ² The paper sheet of the paper mulching film sample is formed and dried at the temperature of 85 ℃.

7. The gram weight of the formed paper film is 65.92g/m ² The tensile strength was 24.06MPa, and the tear strength was 38.51 kN/m.

Example 3

1. Flax straws with 40 percent of fibrilia content are used as raw materials.

2. Flax straws with the fibrilia content of 40 percent are cut into short straws of about 2cm and weighed, and plant ash accounting for 35 percent of the mass of the straws is added into an electric heating cooking pot for cooking. The cooking temperature is set to be 160 ℃, the heat preservation time is 30min, when the temperature rises to about 120 ℃, the air release valve is opened, the air release valve is closed when the pressure gauge returns to the zero position, and the heat preservation is carried out after the temperature rises to 160 ℃ after the cooking is continued.

3. Washing and cooking the flax straws with water, drying, weighing 220g of absolute dry material of the flax straws, weighing 13L of clear water, soaking the absolute dry material of the flax straws overnight, and adding all the pulp and the water for soaking the pulp into a Wali beater.

4. And (4) defibering the slurry for 40min by using a bottom knife so as to fully dissociate the slurry. And (3) starting pulping the dissociated pulp, wherein the pulping load is 2.5kg, the pulping time is 60min, the pulping load is changed to 3.0kg, the pulping time is 30min, and the pulping degree is measured to be 73 DEG SR by adopting a pulping degree tester.

5. And (3) pulping the flax straw pulp with the beating degree of 89.5 DEG SR into a flax straw pulp board by adopting a paper sheet former, wherein the paper sheet forming and drying temperature is 90 ℃.

6. Taking 1.8g of flax straw pulp board with the beating degree of 89.5 DEG SR, thoroughly soaking for more than 6h at room temperature with water, stirring for more than 1h with a magnetic stirrer, defibering on a standard defibering device, and pulping with a paper sheet former to obtain the product with the gram weight of 56.37g/m ² The paper sheet forming and drying temperature of the paper mulching film sample sheet is 90 ℃.

7. The gram weight of the formed paper film is 56.37g/m ² The tensile strength was 17.36MPa, and the tear strength was 19.81 kN/m.

Example 4

1. Flax straws with 40 percent of fibrilia content are used as raw materials.

2. Flax straws with the hemp fiber content of 40 percent are cut into short straws of about 2cm and weighed, and plant ash accounting for 35 percent of the mass of the straws is added into the short straws for cooking in an electric heating cooking pot. The cooking temperature is set to be 160 ℃, the heat preservation time is 30min, when the temperature rises to about 120 ℃, the air release valve is opened, the air release valve is closed when the pressure gauge returns to the zero position, and the heat preservation is carried out after the temperature is continuously cooked and rises to 160 ℃.

3. Washing and cooking the flax straws with water, drying, weighing 275g of absolute dry materials of the flax straws, weighing 17L of clear water, soaking the absolute dry materials of the flax straws overnight, and adding all the slurry and the water for soaking the slurry into a Wali beater.

4. And (4) defibering the slurry for 40min by using a bottom knife so as to fully dissociate the slurry. And (3) starting beating the dissociated slurry, wherein the beating load is 2.5kg, the beating time is 75min, the beating load is changed to 4.5kg, the beating time is 45min, and the beating degree is measured to be 89.5 DEG SR by adopting a beating degree tester.

6. Taking 1.7g of flax straw pulp board with the beating degree of 89.5 DEG SR and 0.2g of waste paper, thoroughly soaking the flax straw pulp board and the waste paper for more than 6 hours at room temperature by using water, stirring the mixture for more than 1 hour by using a magnetic stirrer, defibering the mixture on a standard defibering device, and making the mixture into paper with the gram weight of 58.60g/m by using a paper sheet former ² The paper sheet of the paper mulching film sample is formed and dried at the temperature of 90 ℃.

7. The gram weight of the formed paper film is 58.60g/m ² The tensile strength was 19.74MPa, and the tear strength was 32.3 kN/m.

The stress-strain curve of the mulching film of the whole flax straw bio-matrix paper prepared in the embodiment when stretched is shown in fig. 6, and the load-displacement curve of the mulching film of the whole flax straw bio-matrix paper when torn is shown in fig. 7.

Effects of the embodiment

The whole flax straw biological matrix paper mulching films 1 and 4 of the embodiment are used as field sample direct detection objects, and the detection results are as follows: the whole-flax straw biological matrix paper mulching film 1 is characterized in that an experimental variety is organic flax, the length of the main diameter is 62.5cm, the number of fruits is 22, the number of fruit grains is 10, the weight of thousand seeds is 6.87g, the number of branches is 31, the weed removing effect is good, the requirements of the organic flax on soil temperature, oxygen content and water content in the emergence period, the cotyledon period, the bud period, the flowering period and the mature period can be completely met, the whole-flax straw biological matrix paper mulching film gradually starts to degrade along with the increase of the number of days for film paving, within the first 38 days, the mulching film has certain change but no obvious degradation phenomenon, thus not only ensuring the growth of the crops in the seedling stage, but also achieving the effect of weeding, and being continuously degraded by microorganisms along with the growth of the crops, at 75 days, obvious degradation phenomenon exists, but the effect of the mulching film is still kept, and the growth of weeds can be inhibited. After complete degradation, the degradation products increase the organic matters of the soil by nearly 0.8 percent, promote the growth of crops and have the yield of 40.2 kg/mu.

The detection result is as follows: 4, the experimental variety is organic flax, the length of the main diameter is 62.1cm, the number of fruits is 23, the number of fruit grains is 10, the weight of thousand seeds is 6.97g, the number of branches is 32, the weed removing effect is good, the requirements of the organic flax on soil temperature, oxygen content and water content in the seedling emergence period, the cotyledon period, the bud period, the flowering period and the mature period can be completely met, the whole flax straw biological matrix paper mulching film gradually starts to degrade along with the increase of the number of days for film laying, within the first 36 days, the mulching film has certain change but no obvious degradation phenomenon, thus not only ensuring the growth of crops in the seedling stage, but also achieving the effect of weeding, and the mulching film is also degraded by microorganisms continuously along with the growth of crops, at 72 days, obvious degradation phenomenon exists, but the effect of the mulching film is still maintained, and the growth of weeds can be inhibited. After complete degradation, the degradation products increase the organic matters of the soil by nearly 1 percent, promote the growth of crops and have the yield of 39.8 kg/mu.

Example 5

The cow dung-based full-biological matrix paper mulching film provided by the embodiment of the invention consists of 5-75% of flax straws and cow dung in percentage by mass, and the balance of cow dung is 100%.

As shown in fig. 8, the preparation method of the cow dung-based full-biological matrix paper mulching film provided by the embodiment of the invention comprises the following steps:

s201, taking cow dung and flax straws with fibrilia content of 40% as raw materials, and pretreating the cow dung and the flax straws with fibrilia content of 40%;

s202, pulping the pretreated cow dung and the flax straws by using a Wahler pulping machine, and respectively measuring the pulping degree of the cow dung and the pulping degree of the flax straws by using a pulping degree measuring instrument. Wherein, for cow dung slurry, a bed knife is selected to untwist the slurry for 20min, the pulping load is selected to be 1.5kg, the pulping is carried out for 90min, the pulping load is increased to 2.5kg, the pulping is continued for 15min, and the pulping degree of the slurry is 31 DEG SR; loosening the pulp for 20min by using a bed knife, selecting 1.5kg of pulping load, pulping for 75min, increasing the pulping load to 2.5kg, and continuously pulping for 60min to obtain the pulp with the pulping degree of 43 DEG SR; and (3) selecting a bed knife to untwist the pulp for 30min, selecting 1.5kg of pulping load, pulping for 45min, then adding the pulping load to 2.5kg, and continuing pulping for 90min to obtain the pulp with the pulping degree of 49 DEG SR. Wherein, aiming at the flax straw pulp, a bed knife is selected to untwist the pulp for 40min, the pulping load is selected to be 2.5kg, the pulping is carried out for 60min, the pulping load is increased to be 3.0kg, the pulping is continued for 30min, and the pulping degree of the pulp is 73 DEG SR; the slurry is defibered for 45min by selecting a bed knife, the pulping load is selected to be 2.5kg, the pulping is carried out for 60min, the pulping load is increased to be 3.0kg, the pulping is continued for 30min, the pulping load is increased to be 4.0kg, the pulping is continued for 15min, and the pulping degree of the slurry is 80 DEG SR; and (3) selecting a bed knife to untwist the pulp for 40min, selecting the pulping load of 2.5kg, pulping for 75min, then adding the pulping load to 4.5kg, and continuing pulping for 45min to obtain the pulp with the pulping degree of 89.5 DEG SR.

S203, quantifying the pulped cow dung and the flax straws according to the absolute dry weight, proportioning according to the mass percent of the flax straws of 5-75%, defibering the mixed absolute dry pulp in a standard defibering device, and pulping to obtain a paper mulching film sample sheet.

Example 6

1. Cow dung and flax straws with the fibrilia content of 40 percent are used as raw materials.

2. And (3) separating the manure and water of the cow dung in a mechanical extrusion mode, and separating dry substances in the cow dung. And weighing the separated dry cow dung, adding plant ash accounting for 10% of the mass of the cow dung, and soaking the mixture of the cow dung and the plant ash for more than 10 hours by using clear water. And (3) washing the mixture of the cow dung and the plant ash for a plurality of times by using water, and washing sand, sandy soil and other impurities in the cow dung. And drying the cleaned cow dung in an oven at the drying temperature of 60 ℃.

3. Weighing 520g of cow dung dry matter, weighing 13L of clear water, thoroughly soaking the cow dung dry matter for more than 4h, and adding all the pulp and the water for soaking the pulp into a Waley pulping machine (TD6-23 type).

4. And (4) selecting a bottom knife to untwist the slurry for 30min so as to fully dissociate the slurry. And (3) starting pulping the dissociated pulp, selecting 1.5kg of pulping load, wherein the pulping time is 45min, increasing the pulping load to 2.5kg, continuing pulping for 90min, and determining the pulping degree to be 49 DEG SR by adopting a pulping degree tester (TD 9-M).

5. And (3) making the cow dung slurry with the beating degree of 49 DEG SR into a cow dung slurry plate by adopting a paper forming device, wherein the forming and drying temperature of the paper is 80 ℃.

6. Flax straws with the hemp fiber content of 40 percent are cut into short straws of about 2cm and weighed, and plant ash accounting for 25 percent of the mass of the straws is added to be cooked in an electric heating cooking pot (TD1-15 type). The cooking temperature is set to be 160 ℃, the heat preservation time is 30min, when the temperature rises to about 120 ℃, the air release valve is opened, the air release valve is closed after the pressure gauge returns to zero, and the heat preservation is carried out after the temperature is continuously cooked and rises to 160 ℃.

7. Washing and cooking the flax straws with water, drying, weighing 289g of absolute dry flax straw, weighing 17L of clear water, soaking the absolute dry flax straw overnight, and adding all the pulp and the water for soaking the pulp into a Wali beater.

8. And (4) defibering the slurry for 40min by using a bottom knife so as to fully dissociate the slurry. And (3) starting pulping the dissociated pulp, wherein the pulping load is 2.5kg, the pulping time is 75min, the pulping load is changed to 4.5kg, the pulping time is 45min, and the pulping degree is determined to be 89.5 DEG SR by adopting a pulping degree tester.

9. The flax straw pulp with the beating degree of 89.5 DEG SR is made into flax straw pulp boards by a paper former (TD10-200 type), and the paper forming and drying temperature is 80 ℃.

10. Taking 0.5g of cow dung pulp board with beating degree of 49 DEG SR and 1.5g of flax straw pulp board with beating degree of 89.5 DEG SR, mixing the two, soaking thoroughly in water at room temperature for more than 6h, stirring with a magnetic stirrer (85-2 type constant temperature magnetic stirrer) for more than 1h, defibering on a standard defibering device (TD15-A type, rotation number 20000r, stirrer rotation speed 2900 +/-100 r/min), and pulping with a paper sheet former to obtain pulp with gram weight of 63.38g/m ² The paper sheet of the paper mulching film sample is formed and dried at the temperature of 90 ℃.

11. The gram weight of the formed paper film is 63.38g/m ² The tensile strength is 12.99MPa, and the tear strength is 26.90 kN/m.

The invention relates to a picture of cow dung after the cow dung-based full biological matrix paper mulch raw material is pretreated. A photograph of cow dung is shown in fig. 9, a photograph of flax straws containing 40% of fibrilia in raw materials of the cow dung-based full biological matrix paper mulch film is shown in fig. 10, a photograph of a full appearance of a prepared cow dung-based full biological matrix paper mulch film sample is shown in fig. 11, a thickness (spiral micrometer) of the cow dung-based full biological matrix paper mulch film sample prepared in the embodiment is shown in fig. 12, a stress-strain curve of the prepared cow dung-based full biological matrix paper mulch film during stretching is shown in fig. 13, and a load-displacement curve of the cow dung-based full biological matrix paper mulch film during tearing is shown in fig. 14.

Example 7

1. Cow dung and flax straws with 40 percent of fibrilia content are used as raw materials.

2. And (3) separating the manure and water of the cow dung in a mechanical extrusion mode, and separating dry substances in the cow dung. And weighing the separated dry cow dung, adding plant ash accounting for 15% of the mass of the cow dung, and soaking the mixture of the cow dung and the plant ash in clear water for more than 10 hours. And (3) washing the mixture of the cow dung and the plant ash for a plurality of times by using water, and washing sand, sandy soil and other impurities in the cow dung. And drying the cleaned cow dung in an oven at the drying temperature of 70 ℃.

3. Weighing 540g of cow dung absolute dry material, weighing 17L of clear water, thoroughly soaking the cow dung absolute dry material for more than 4h, and adding all the pulp and the water for soaking the pulp into a Waley pulping machine.

4. And (4) selecting a bottom knife to untwist the slurry for 30min so as to fully dissociate the slurry. And (3) starting pulping the dissociated pulp, selecting 1.5kg of pulping load, wherein the pulping time is 45min, increasing the pulping load to 2.5kg, continuing pulping for 90min, and determining the pulping degree to be 49 DEG SR by adopting a pulping degree tester.

5. And (3) making the cow dung slurry with the beating degree of 49 DEG SR into a cow dung slurry plate by adopting a paper forming device, wherein the forming and drying temperature of the paper is 90 ℃.

6. Flax straws with the hemp fiber content of 40 percent are cut into short straws of about 2cm and weighed, and plant ash accounting for 30 percent of the mass of the straws is added into the short straws for cooking in an electric heating cooking pot. The cooking temperature is set to be 160 ℃, the heat preservation time is 30min, when the temperature rises to about 120 ℃, the air release valve is opened, the air release valve is closed when the pressure gauge returns to the zero position, and the heat preservation is carried out after the temperature is continuously cooked and rises to 160 ℃.

7. Washing and cooking the flax straws with water, drying, weighing 275g of absolute dry materials of the flax straws, weighing 17L of clear water, soaking the absolute dry materials of the flax straws overnight, and adding all the slurry and the water for soaking the slurry into a Wali beater.

8. And (4) selecting a bottom knife to untwist the slurry for 40min so as to fully dissociate the slurry. And (3) starting pulping the dissociated pulp, wherein the pulping load is 2.5kg, the pulping time is 75min, the pulping load is changed to 4.5kg, the pulping time is 45min, and the pulping degree is determined to be 89.5 DEG SR by adopting a pulping degree tester.

9. And (3) pulping the flax straw pulp with the beating degree of 89.5 DEG SR into a flax straw pulp board by adopting a paper sheet former, wherein the paper sheet forming and drying temperature is 90 ℃.

10. Mixing cow dung pulp board 1g with beating degree of 49 DEG SR and flax straw pulp board 1g with beating degree of 89.5 DEG SR, soaking thoroughly in water at room temperature for more than 6h, stirring with magnetic stirrer for more than 1h, defibering in standard defibering device, and making into paper with gram weight of 62.74g/m ² The paper sheet of the paper mulching film sample is formed and dried at the temperature of 90 ℃.

11. The gram weight of the formed paper film is 62.74g/m ² The tensile strength was 7.68MPa, and the tear strength was 15.42 kN/m.

Example 8

2. And (3) separating the manure and water of the cow dung in a mechanical extrusion mode, and separating dry substances in the cow dung. And weighing the separated dry cow dung, adding plant ash accounting for 20% of the mass of the cow dung, and soaking the mixture of the cow dung and the plant ash for more than 10 hours by using clear water. And (3) washing the mixture of the cow dung and the plant ash for a plurality of times by using water, and washing sand, sandy soil and other impurities in the cow dung. And drying the cleaned cow dung in an oven at the drying temperature of 80 ℃.

3. Weighing 520g of cow dung absolute dry material, weighing 13L of clear water, thoroughly soaking the cow dung absolute dry material for more than 4h, and adding all the pulp and the water for soaking the pulp into a Waley pulping machine.

4. And (4) selecting a bottom knife to untwist the slurry for 30min so as to fully dissociate the slurry. Pulping the dissociated slurry, selecting pulping load of 1.5kg, pulping for 45min, increasing the pulping load to 2.5kg, continuing pulping for 90min, and determining the pulping degree to be 49 ° SR by using a pulping degree tester.

5. And (3) making the cow dung slurry with the beating degree of 49 DEG SR into a cow dung slurry plate by adopting a paper forming device, wherein the forming and drying temperature of the paper is 100 ℃.

6. Flax straws with the fibrilia content of 40 percent are cut into short straws of about 2cm and weighed, and plant ash accounting for 35 percent of the mass of the straws is added into an electric heating cooking pot for cooking. The cooking temperature is set to be 160 ℃, the heat preservation time is 30min, when the temperature rises to about 120 ℃, the air release valve is opened, the air release valve is closed when the pressure gauge returns to the zero position, and the heat preservation is carried out after the temperature is continuously cooked and rises to 160 ℃.

7. Washing the boiled flax straws with water, drying, weighing 195g of flax straw absolute dry material, weighing 13L of clear water, soaking the flax straw absolute dry material overnight, and adding all the pulp and the water for soaking the pulp into a Wali beater.

10. Mixing 1.1g of cow dung pulp board with beating degree of 49 DEG SR and 0.25g of flax straw pulp board with beating degree of 89.5 DEG SR, soaking thoroughly in water at room temperature for more than 6h, stirring with magnetic stirrer for more than 1h, defibering on standard defibering device, and making into paper with paper former with gram weight of 33.74g/m ² The paper sheet of the paper mulching film sample is formed and dried at the temperature of 90 ℃.

11. The gram weight of the formed paper film is 33.74g/m ² The tensile strength is 1.36MPa, and the tear strength is 3.54 kN/m.

The total amount of the raw materials of the cow dung-based full-biological matrix paper mulch film is less, wherein the larger the mass percentage of cow dung is, the less film is formed, the minimum total amount of the raw materials capable of forming a film is provided by the implementation example, and the mass percentage of the cow dung is the maximum.

The gram weight of the cow dung-based full-biological matrix paper mulching film sample prepared in the embodiment (in terms of the mass of a single sample (the area is 0.0314 m) ² ) Meter) is shown in fig. 15.

Example 9

2. And (3) separating the manure and water of the cow dung in a mechanical extrusion mode, and separating dry substances in the cow dung. And weighing the separated dry cow dung, adding plant ash accounting for 15% of the mass of the cow dung, and soaking the mixture of the cow dung and the plant ash for more than 10 hours by using clear water. And (3) washing the mixture of the cow dung and the plant ash for a plurality of times by using water to wash off sand, sandy soil and other impurities in the cow dung. And drying the cleaned cow dung in an oven at the drying temperature of 60 ℃.

3. Weighing 520g of cow dung absolute dry material, weighing 13L of clear water, thoroughly soaking the cow dung absolute dry material for more than 4 hours, and adding all the pulp and the water for soaking the pulp into a Waley pulping machine.

4. And (4) selecting a bottom knife to untwist the slurry for 20min so as to fully dissociate the slurry. Pulping the dissociated pulp, selecting pulping load of 1.5kg, pulping for 75min, adding the pulping load to 2.5kg, continuing pulping for 60min, and determining the pulping degree to be 43 ° SR by using a pulping degree tester.

5. And (3) manufacturing the cow dung pulp with the beating degree of 43 DEG SR into a cow dung pulp board by adopting a paper forming device, wherein the paper forming and drying temperature is 90 ℃.

9. The flax straw pulp with the beating degree of 89.5 DEG SR is made into the flax straw pulp board by adopting a paper sheet former, and the paper sheet forming and drying temperature is 90 ℃.

10. Mixing cow dung pulp board 0.45g with beating degree of 43 degree SR and flax straw pulp board 1.35g with beating degree of 89.5 degree SR, soaking thoroughly in water at room temperature for more than 6 hr, stirring with magnetic stirrer for more than 1 hr, defibering in standard defibering device, and making into paper with paper former with gram weight of 55.41g/m ² The paper sheet of the paper mulching film sample is formed and dried at the temperature of 90 ℃.

11. The gram weight of the formed paper film is 55.41g/m ² The tensile strength was 13.93MPa, and the tear strength was 16.17 kN/m.

The stress-strain curve of the cow dung-based full-biological matrix paper mulching film prepared in the embodiment when the film is stretched is shown in fig. 16, and the load-displacement curve of the cow dung-based full-biological matrix paper mulching film when the film is torn is shown in fig. 17.

Example 10

The cow dung-based full-biological matrix paper mulching film provided by the embodiment of the invention consists of flax straws and cow dung, wherein the flax straws account for 5% and the balance is 95% of the cow dung in percentage by mass.

Example 11

The cow dung-based full-biological matrix paper mulching film provided by the embodiment of the invention consists of 50% of flax straws and 50% of cow dung in percentage by mass, and the balance is the cow dung.

Example 12

The cow dung-based full-biological matrix paper mulching film provided by the embodiment of the invention consists of 75% of flax straws and 25% of cow dung in percentage by mass.

The cow dung-based full-biological matrix paper mulching films 7 and 9 of the embodiment are used as field sample direct detection objects, and the detection results are as follows: the cow dung-based full-biological matrix paper mulching film 7 is characterized in that silage corns are selected as an experimental variety, the emergence rate is 92.1%, the plant height is 303.9cm, the stem diameter is 19.4cm, the ear position is 168.9cm, the weed removing effect is good, requirements of the silage corns on the growth emergence stage, the plant elongation stage, the emasculation stage and the mature stage on soil temperature, oxygen content and water content can be completely met, the cow dung-based fiber mulching film gradually starts to degrade along with the increase of the number of days of film laying, and the mulching film has a certain change in the previous 30 days but has no obvious degradation phenomenon, so that the growth of crops in the seedling stage can be guaranteed, the weed removing effect can be achieved, the mulching film is also continuously degraded by microorganisms along with the growth of the crops, the obvious degradation phenomenon exists in 65 days, the effect of the mulching film is still maintained, and the growth of weeds can be inhibited. After complete degradation, the degradation product increases the organic matter of soil by nearly 1 percent, promotes the growth of crops and has the yield of 5380 kg/mu.

The detection result is as follows: the cow dung-based full-biological matrix paper mulching film 9 is characterized in that silage corns are selected as an experimental variety, the emergence rate is 93.4%, the plant height is 304.2cm, the stem diameter is 19.6cm, the ear position is 169.1cm, the weed removing effect is good, requirements of the silage corns on the growth emergence stage, the jointing stage, the emasculation stage and the mature stage on soil temperature, oxygen content and water content can be completely met, the cow dung-based fiber mulching film gradually starts to degrade along with the increase of the number of days of film laying, and the mulching film has a certain change in the previous 32 days but has no obvious degradation phenomenon, so that the growth of crops in the seedling stage can be guaranteed, the weed removing effect can be achieved, the mulching film is also continuously degraded by microorganisms along with the growth of the crops, the obvious degradation phenomenon exists in 68 days, the effect of the mulching film is still kept, and the growth of weeds can be inhibited. After complete degradation, the degradation products increase the organic matters of the soil by nearly 1 percent, promote the growth of crops and have the yield of 5430 kg/mu.

Example 13

The embodiment of the invention also provides a whole flax straw bio-matrix paper mulching film which is prepared from 90-100% of flax straws and 0-10% of a small amount of cotton pulp oven-dried pulp as an auxiliary agent in percentage by mass.

The preparation method of the whole-flax straw bio-matrix paper mulching film provided by the embodiment of the invention comprises the following steps:

S102, pulping the preprocessed flax straws by using a Warley beater, and determining the beating degree of the flax straws by using a beating degree determinator. The specific parameters are as follows: selecting a bed knife to untwin the pulp for 40min, selecting the pulping load of 2.5kg, pulping for 60min, then adding the pulping load to 3.0kg, and continuing pulping for 30min to obtain the pulp with the pulping degree of 73 DEG SR; the slurry is defibered for 45min by selecting a bed knife, the pulping load is selected to be 2.5kg, the pulping is carried out for 60min, the pulping load is increased to be 3.0kg, the pulping is continued for 30min, the pulping load is increased to be 4.0kg, the pulping is continued for 15min, and the pulping degree of the slurry is 80 DEG SR; and (3) selecting a bed knife to untwist the pulp for 40min, selecting the pulping load of 2.5kg, pulping for 75min, then adding the pulping load to 4.5kg, and continuing pulping for 45min to obtain the pulp with the pulping degree of 89.5 DEG SR.

S104, quantifying the pulped flax straws and cotton pulp according to the absolute dry pulp, proportioning according to the mass percent of the absolute dry pulp containing the cotton pulp, defibering the mixed absolute dry pulp in a standard defibering device, and pulping to obtain a paper mulching film sample sheet.

In step S101, the pretreatment of flax straws with a flax fiber content of 40% comprises:

The capacity of the Wali beater is 23L, and the capacity of the electric heating cooking pot is 15L.

In step S101, the pretreatment of the flax straw having a flax fiber content of 40% further comprises:

The stewing temperature of the flax straws is 160-170 ℃, the stewing pressure is not more than 0.8MPa, and the heat preservation time is 30-60 min.

In step S103, the thickness of the paper mulching film0.098-0.15 mm, and gram weight of 40g/m ² -70g/m ² The tensile strength is 16.20MPa-27.62MPa, and the tearing strength is 19.81kN/m-40.24 kN/m.

(1) tearing the flax straw pulp board with the beating degree of 73-90 DEG SR into small pieces, mixing the small pieces with cotton pulp absolute dry pulp according to the mass percent of 100%, 95% and 90% of flax straw, wherein the thickness of the formed paper film is 0.100-0.122 mm, and the gram weight is 40g/m ² -70g/m ² ；

(2) Contains flax straw 100 wt%, flax straw 95 wt%, flax straw 90 wt%, flax straw 0.100-0.122 mm in thickness and flax straw 40g/m in gram weight ² -70g/m ² The tensile strength of the paper mulching film is 16.16MPa-27.36MPa, and the tearing strength is 18.92kN/m-37.16 kN/m.

For this example, the following specific processing method can be employed. The method comprises the following specific steps:

1. flax straws with 40 percent of fibrilia content are used as raw materials.

2. Flax straws with the fibrilia content of 40 percent are cut into short straws of about 2cm and weighed, and plant ash accounting for 35 percent of the mass of the straws is added into an electric heating cooking pot for cooking. The cooking temperature is set to be 160 ℃, the heat preservation time is 30min, when the temperature rises to about 120 ℃, the air release valve is opened, the air release valve is closed when the pressure gauge returns to the zero position, and the heat preservation is carried out after the temperature is continuously cooked and rises to 160 ℃.

6. Taking 1.8g of flax straw pulp board with beating degree of 89.5 DEG SR and 0.2g of cotton pulp oven-dried pulp, thoroughly soaking for more than 6h at room temperature with water, stirring for more than 1h with a magnetic stirrer, defibering on a standard defibering device, and making into paper with a paper sheet former with a gram weight of 56.30g/m ² The paper sheet of the paper mulching film sample is formed and dried at the temperature of 90 ℃.

7. The gram weight of the formed paper film is 56.30g/m ² The tensile strength was 17.36MPa, and the tear strength was 30.76 kN/m.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made by those skilled in the art within the technical scope of the present invention disclosed in the present invention should be covered within the scope of the present invention.

Claims

1. The full-flax straw bio-matrix paper mulching film is characterized by being prepared from 90-100% of flax straws and 0-10% of a small amount of waste paper pulp as an auxiliary agent in percentage by mass.

2. The preparation method of the whole flax straw bio-matrix paper mulching film according to claim 1, wherein the preparation method of the whole flax straw bio-matrix paper mulching film comprises the following steps:

firstly, flax straws with 40% of fibrilia content are used as raw materials, and the flax straws with 40% of fibrilia content are pretreated;

pulping the pretreated flax straws by using a Warley pulping machine, and measuring the pulping degree of the flax straws by using a pulping degree tester;

thirdly, quantitatively pulping the flax straws according to absolute dry pulp, defibering the absolute dry pulp in a standard defibering device, and making paper mulching film sample sheets;

and step four, proportioning the pulped flax straws and waste paper pulp according to the mass percent of the waste paper pulp after quantifying the absolute dry pulp, defibering the mixed absolute dry pulp in a standard defibering device, and making to obtain a paper mulching film sample sheet.

3. The preparation method of the whole flax straw bio-matrix paper mulching film according to claim 2, wherein in the first step, the pretreatment of the flax straw with the flax fiber content of 40% comprises:

(2) washing the boiled flax straws with water, drying the flax straws in an oven at a conventional drying temperature, weighing absolute dry flax straw materials according to the mass ratio of the absolute dry flax straws to pulping clear water of 1.3-1.7%, and soaking the absolute dry flax straw materials overnight;

(4) a bottom knife is selected to untwist the slurry for 30min to 45min so that the slurry is fully dissociated;

4. The preparation method of the whole flax straw bio-matrix paper mulch film according to claim 3, wherein the capacity of the pulping machine is 23L, and the capacity of the electric heating digester is 15L.

5. The preparation method of the whole flax straw bio-matrix paper mulching film according to claim 3, wherein the pulping concentration is 1.3-1.7%, the defibering time is 30-45 min, the pulping load is 2.5-4.5kg, the pulping time is 90-180 min, the pulping degree is 73-90 ° SR, and the paper sheet forming and drying temperature is 80-90 ℃.

6. The preparation method of the whole flax straw bio-matrix paper mulch film according to claim 2, wherein in the first step, the flax straw with a fibrilia content of 40% is pretreated, further comprising:

7. The preparation method of the whole flax straw bio-matrix paper mulching film according to claim 6, wherein the flax straw cooking temperature is 160-170 ℃, the cooking pressure is not more than 0.8MPa, and the heat preservation time is 30-60 min.

8. The preparation method of the whole flax straw bio-matrix paper mulching film according to claim 2, wherein in the third step, the thickness of the paper mulching film is thickThe weight is 0.098mm-0.15mm and the gram weight is 40g/m ² -70g/m ² The tensile strength is 16.20MPa to 27.62MPa, and the tearing strength is 19.81kN/m to 40.24 kN/m.

9. The preparation method of the whole flax straw bio-matrix paper mulching film according to claim 2, wherein the preparation method of the whole flax straw bio-matrix paper mulching film further comprises:

(2) Thoroughly soaking flax straw pulp board and waste paper in a certain proportion in water at room temperature for more than 6h, stirring with magnetic stirrer for more than 1h, defibering in standard defibering device, and making into paper with thickness of 0.098-0.15 mm and gram weight of 40g/m ² -70g/m ² The paper sheet of the paper mulching film sample is formed and dried at the temperature of 80-90 ℃.

10. The preparation method of the whole flax straw bio-matrix paper mulching film according to claim 2, wherein the preparation method of the whole flax straw bio-matrix paper mulching film further comprises:

(1) tearing flax straw pulp board with the beating degree of 89.5 DEG SR and waste paper into small pieces, and mixing the small pieces according to the mass percent of 100%, 95% and 90% of flax straw, wherein the thickness of the formed paper film is 0.098mm-0.15mm, and the gram weight is 40g/m ² -70g/m ² ；

11. The cow dung-based full-biological matrix paper mulching film is characterized by comprising, by mass, 5% -75% of flax straws and 100% of cow dung in balance.

12. The cow dung-based full biological matrix paper mulching film according to claim 11, wherein the cow dung-based full biological matrix paper mulching film is prepared from 50% of hemp and 50% of cow dung by mass percentage.

13. The preparation method of the cow dung-based full biological matrix paper mulching film according to any one of claims 11 to 12, wherein the preparation method of the cow dung-based full biological matrix paper mulching film comprises the following steps:

and thirdly, quantifying the pulped cow dung and the flax straws according to the absolute dry weight, proportioning according to the mass percent of the flax straws of 5-75%, defibering the mixed absolute dry pulp in a standard defibering device, and making to obtain a paper mulching film sample.

14. The method for preparing the cow dung-based full-biological matrix paper mulching film according to claim 13, wherein in the first step, the pretreatment of cow dung comprises the following steps:

(1) separating manure from water by a mechanical extrusion mode, and separating dry substances in the cow manure;

(2) weighing the separated dry cow dung, adding plant ash accounting for 10-20% of the mass of the cow dung, and soaking the mixture of the cow dung and the plant ash in clear water for more than 10 hours;

(4) drying the cleaned cow dung in an oven at the drying temperature of 60-90 ℃, weighing a cow dung absolute dry material according to the ratio of the cow dung absolute dry mass to the pulping clear water of 3-4%, and thoroughly soaking the cow dung absolute dry material for more than 4 hours;

(5) slowly adding all the pulp and water for soaking the pulp according to the concentration of 3-4 percent until the total volume of the pulp and the water reaches the lowest volume which is allowed to work by the Tile beater;

(7) pulping the dissociated slurry with a pulping load of 1.5kg-2.5kg for 60min-180min, and determining the pulping degree to be 30-49 ° SR by using a pulping degree tester;

(8) and (3) respectively manufacturing the cow dung pulp with the beating degree of 30-49 DEG SR into cow dung pulp boards by adopting a paper forming device, wherein the paper forming and drying temperature is 80-100 ℃.

15. The method for preparing the cow dung-based full-biological matrix paper mulching film as claimed in claim 13, wherein in the first step, the pretreatment of the flax straws with the fibrilia content of 40% comprises the following steps:

(2) washing the boiled flax straws with water, drying the flax straws in an oven at a conventional drying temperature, weighing absolute dry flax straw materials according to the mass ratio of 1.3-1.7% of the absolute dry flax straws to pulping clear water, and soaking the absolute dry flax straw materials overnight;

(3) slowly adding all the pulp and water for soaking the pulp according to the concentration of 1.3-1.7% until the total volume of the pulp and the water reaches the lowest volume allowed by the wary beater to work;

(6) respectively making the flax straw pulp with the beating degree of 73-90 DEG SR into flax straw pulp boards by adopting a paper sheet former, wherein the paper sheet forming and drying temperature is 80-90 ℃.

16. The method for preparing the cow dung-based full-biological matrix paper mulching film as claimed in claim 13, wherein in the first step, the pretreatment of the flax straws with the fibrilia content of 40% further comprises:

(3) in the cooking process, when the temperature rises to 120 ℃ and the corresponding pressure is about 0.2MPa-0.3MPa, the air release valve is opened, the air release valve is closed when the pressure gauge returns to the zero position, and the temperature is kept after the temperature rises to the set temperature.

17. The method for preparing the cow dung-based full-biological matrix paper mulching film according to claim 13, wherein in the second step, the capacity of the wary beater is 23L, the capacity of the electric heating digester is 15L, and the addition amount of plant ash is 25% -35% of the total mass of the materials;

the pulping concentration of the cow dung is 3-4%, the defibering time is 5-30 min, the pulping load is 1.5-2.5 kg, the pulping time is 60-180 min, the pulping degree is 30-49 DEG SR, and the forming and drying temperature of paper sheets is 80-100 ℃;

18. The method for preparing the cow dung-based full-biological matrix paper mulching film according to claim 13, wherein in the third step, the paper mulching filmThe film comprises 75 percent, 50 percent, 25 percent, 10 percent and 5 percent of flax straws in percentage by mass, the thickness of the paper mulching film is 0.108mm-0.23mm, and the gram weight is 22g/m ² -70g/m ² The tensile strength is 0.32MPa to 15.01MPa, and the tearing strength is 1.05kN/m to 26.97 kN/m.

19. The method for preparing the cow dung-based full bio-matrix paper mulch film according to claim 13, wherein the method for preparing the cow dung-based full bio-matrix paper mulch film further comprises:

(1) tearing a cow dung pulp board with the beating degree of 30-49 DEG SR and a flax straw pulp board with the beating degree of 73-90 DEG SR into small pieces, and proportioning according to the mass percent of 75%, 50%, 25%, 10% and 5% of flax straws, wherein the thickness of a formed paper film is 0.108-0.23 mm, and the gram weight is 22g/m ² -70g/m ² ；

(2) Thoroughly soaking the mixed pulp board of the cow dung pulp board and the flax straw pulp board in a ratio for more than 6 hours at room temperature by using water, stirring the mixed pulp board for more than 1 hour by using a magnetic stirrer, defibering the mixed pulp board on a standard defibering device, and respectively making the mixed pulp board into the mixed pulp board with the thickness of 0.108 to 0.23mm and the gram weight of 22g/m by using a paper sheet former ² -70g/m ² The paper sheet of the paper mulching film sample is formed and dried at the temperature of 80-90 ℃.

20. The method for preparing the cow dung-based full-bio matrix paper mulching film according to claim 13, wherein the method for preparing the cow dung-based full-bio matrix paper mulching film further comprises:

(1) tearing a cow dung pulp board with the beating degree of 49 DEG SR and a flax straw pulp board with the beating degree of 89.5 DEG SR into small pieces, and proportioning according to the mass percent of 75%, 50%, 25%, 10% and 5% of flax straws, wherein the thickness of the formed paper film is 0.108mm-0.23mm, and the gram weight is 22g/m ² -70g/m ² ；

(2) Contains 75 percent, 50 percent, 25 percent, 10 percent and 5 percent of flax straws in percentage by mass, the thickness is 0.108mm-0.23mm, and the gram weight is 22g/m ² -70g/m ² The tensile strength of the paper mulching film is 0.32MPa to 15.01MPa, and the tearing strength is 1.05kN/m to 26.97 kN/m.

21. The full-flax straw biological matrix paper mulching film is characterized by being prepared from 90-100% of flax straws and 0-10% of cotton pulp oven-dried pulp serving as auxiliaries in percentage by mass.

22. The preparation method of the full-flax straw bio-matrix paper mulching film according to claim 21, wherein the preparation method of the full-flax straw bio-matrix paper mulching film comprises the following steps:

and step four, proportioning the pulped flax straws and cotton pulp according to the mass percent of absolute dry pulp containing the cotton pulp after quantifying the absolute dry pulp, defibering the mixed absolute dry pulp in a standard defibering device, and making to obtain a paper mulching film sample sheet.

23. The method for preparing the whole flax straw bio-matrix paper mulch film according to claim 22, wherein in the first step, the pretreatment of the flax straw with the fibrilia content of 40% comprises:

24. The method for preparing a whole flax straw bio-matrix paper mulch film according to claim 22, wherein in step one, the pretreatment of flax straw with a fibrilia content of 40% further comprises:

25. The method for preparing the whole flax straw bio-matrix paper mulching film according to claim 22, wherein the method for preparing the whole flax straw bio-matrix paper mulching film further comprises:

(2) Thoroughly soaking flax straw pulp board and cotton pulp oven-dried pulp in a certain proportion in water at room temperature for more than 6h, stirring with magnetic stirrer for more than 1h, defibering in standard defibering device, and making into paper sheets with thickness of 0.100-0.122 mm and gram weight of 40g/m ² -70g/m ² The paper sheet of the paper mulching film sample is formed and dried at the temperature of 80-90 ℃.

26. The method for preparing the whole flax straw bio-matrix paper mulch film according to claim 22, wherein the method for preparing the whole flax straw bio-matrix paper mulch film further comprises:

(1) tearing the flax straw pulp board with the beating degree of 89.5 DEG SR into small pieces, mixing the small pieces with cotton pulp oven dry pulp according to the mass percent of 100 percent, 95 percent and 90 percent of flax straw, and forming a paper film with the thickness of 0.100mm-0.122mm and the gram weight of 40g/m ² -70g/m ² ；