CN112127210A - Seedling raising paper pulp and preparation method thereof, and seedling raising paper and preparation method thereof - Google Patents

Seedling raising paper pulp and preparation method thereof, and seedling raising paper and preparation method thereof Download PDF

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Publication number
CN112127210A
CN112127210A CN202010937372.2A CN202010937372A CN112127210A CN 112127210 A CN112127210 A CN 112127210A CN 202010937372 A CN202010937372 A CN 202010937372A CN 112127210 A CN112127210 A CN 112127210A
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fiber
paper
mass
mixed
wet strength
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钟昆恒
杨仁党
陈通
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Dongguan Enzhuo Intelligent Technology Co ltd
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Dongguan Enzhuo Intelligent Technology Co ltd
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/224—Use of means other than pressure and temperature
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/18—Reinforcing agents
    • D21H21/20—Wet strength agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
    • D21H25/04—Physical treatment, e.g. heating, irradiating
    • D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper

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Abstract

The seedling raising paper pulp comprises mixed fibers, and further comprises a wet strength agent and a wet strength agent promoter, wherein the mass of the wet strength agent is 2% -15% of that of the mixed fibers, the mass of the wet strength agent promoter is 1% -10% of that of the mixed fibers, the mixed fibers comprise plant fibers, first reinforcing fibers and second reinforcing fibers, the mass percentage of the first reinforcing fibers in the mixed fibers is 20% -80%, the mass percentage of the second reinforcing fibers in the mixed fibers is less than or equal to 10%, the first reinforcing fibers are ES fibers, and the second reinforcing fibers comprise at least one of polylactic acid fibers, polybutylene succinate fibers, polyvinyl alcohol fibers and polybutylene adipate terephthalate fibers. The invention also provides a preparation method of the seedling raising paper pulp, the seedling raising paper and a preparation method of the seedling raising paper.

Description

Seedling raising paper pulp and preparation method thereof, and seedling raising paper and preparation method thereof
Technical Field
The invention relates to the technical field of seedling raising, in particular to seedling raising paper pulp and a preparation method thereof, and seedling raising paper and a preparation method thereof.
Background
In the traditional seedling raising, both cutting seedlings and sowing seedlings have inherent defects. Because the seedbed is repeatedly used for many times and continuous cropping is frequent, the soil root-knot nematode is damaged. The sown seedlings are directly sown in the field, and the seedlings are thinned in the later period and frequently pulled out and transplanted in the grading process, so that the survival rate of the seedlings is greatly influenced. Because the seedling has only one main root, the root system is easy to be damaged by lifting the seedling, and the seedling does not contain soil, and a long seedling revival period is needed after transplanting. Later, people slowly changed the plastic nutrition bags as seedling raising paper to solve the problem of field seedling raising. Although the problems of continuous cropping and root breaking in the field are solved, the purchase cost of the plastic film is low, but a new problem is brought. Because the toughness of the plastic film is extremely strong, the root system can not penetrate through the film to grow out, bad root system conditions such as root nest and askew root are easily generated, the plastic film has poor air permeability, the plastic needs to be removed from a bag and transplanted during planting, the plastic needs to be recycled, the degradation time is long, and white pollution is generated to the environment. In addition, the plastic nutrition bagged soil is used, because the automation level is not high, a large amount of labor force is needed to complete the soil filling process every seedling growing season, and the difficulties that a requester is difficult and nobody is willing to do the work are raised nowadays.
Along with global warming, China gradually attaches importance to the environmental protection industry, and now many people slowly adopt non-woven fabrics to replace traditional plastic seedling raising bags for seedling raising. It should be explained that the non-woven fabric is also made of PP polypropylene plastic material through different processes, so the non-woven fabric is also plastic in nature, but is easier to be photolyzed into plastic powder compared with a plastic film, but finally exists in soil as a plastic powder component, takes at least one hundred years to complete degradation, and is easy to cause soil hardening.
Disclosure of Invention
In view of the above, the invention provides a seedling raising paper pulp capable of producing degradable seedling raising paper.
It is also necessary to provide a preparation method of the paper pulp for raising seedlings.
It is also necessary to provide a preparation method capable of preparing the degradable seedling raising paper.
It is also necessary to provide seedling raising paper manufactured by the preparation method of the seedling raising paper.
A paper pulp for raising seedlings comprises mixed fibers, a wet strength agent and a wet strength agent promoter, the mass of the wet strength agent is 2-15% of the mass of the mixed fiber, the mass of the wet strength agent promoter is 1-10% of the mass of the mixed fiber, the mixed fiber comprises plant fiber, first reinforced fiber and second reinforced fiber, the mass percentage of the first reinforced fiber in the mixed fiber is 20-80%, the mass percentage of the second reinforcing fibers in the mixed fibers is less than or equal to 10%, the first reinforcing fiber is ES fiber, and the second reinforcing fiber comprises at least one of polylactic acid fiber, polybutylene succinate fiber, polyvinyl alcohol fiber and polybutylene adipate terephthalate fiber.
Further, the plant fiber is at least one of pulped and unpulped hemp pulp fiber.
Further, the plant fiber is needle-leaved wood fiber which is pulped and hemp pulp fiber which is not pulped.
Further, the beating degree of the plant fiber is 20-50 DEG SR.
Further, the mass percentage of the first reinforcing fiber in the mixed fiber is 30%, the beating degree of the plant fiber is 28 DEG SR, the mass of the wet strength agent is 10% of the mass of the mixed fiber, and the mass of the wet strength agent promoter is not more than 2% of the mass of the mixed fiber.
Further, the mass percentage of the first reinforcing fiber in the mixed fiber is 45%, the mass percentage of the second reinforcing fiber in the mixed fiber is 5%, the mass of the wet strength agent is 10% of the mass of the mixed fiber, the mass of the wet strength agent accelerator is not more than 2% of the mass of the mixed fiber, and the beating degree of the plant fiber is 38 ° SR.
Further, the wet strength agent promoter is a carboxymethyl cellulose solution, the substitution degree of the carboxymethyl cellulose is 0.2-1.2, and the mass concentration of the carboxymethyl cellulose is 0.1-5%.
Further, the mass percentage of the second reinforcing fibers in the mixed fibers is less than or equal to 10%.
A preparation method of paper pulp for raising seedlings comprises the following steps: preparing mixed fibers: the mixed fiber comprises plant fiber, first reinforced fiber and second reinforced fiber, wherein the mass percentage of the first reinforced fiber in the mixed fiber is 20-80%, the mass percentage of the second reinforced fiber in the mixed fiber is less than or equal to 10%, the first reinforced fiber is ES fiber, and the second reinforced fiber comprises at least one of polylactic acid fiber, polybutylene succinate fiber, polyvinyl alcohol fiber and polybutylene adipate terephthalate fiber; adding a wet strength agent into the mixed fiber, adding water into the mixed fiber added with the wet strength agent, and defibering the slurry to obtain defibered slurry; the mass of the wet strength agent is 2-15% of the mass of the mixed fiber; and adding a prepared wet strength agent accelerator solution into the defibering pulp, and uniformly mixing to obtain the seedling raising pulp.
Further, the plant fiber is at least one of pulped and unpulped hemp pulp fiber.
Further, the plant fiber is needle-leaved wood fiber which is pulped and hemp pulp fiber which is not pulped.
Further, the beating degree of the plant fiber is 20-50 DEG SR.
Further, the wet strength agent promoter is a carboxymethyl cellulose solution, the substitution degree of the carboxymethyl cellulose is 0.2-1.2, and the mass concentration is 0.1% -5%.
Further, the mass percentage of the second reinforcing fibers in the mixed fibers is less than or equal to 10%.
A preparation method of seedling paper comprises the following steps: preparing the paper pulp for raising seedlings by adopting the preparation method of the paper pulp for raising seedlings; pouring the paper pulp slurry for seedling culture into a paper making forming net for dewatering, squeezing, drying and hot pressing to finally obtain a dry paper web; immersing the hot-pressed dry paper web in a diluted hydrophilic agent solution to perform hydrophilic modification on the dry paper web; and taking out the dry paper web after hydrophilic modification and drying to obtain the seedling paper.
Further, the temperature of the dryer is 60-100 ℃.
Further, the temperature of the hot pressing is 60-250 ℃.
Further, the paper basis weight of the seedling raising paper is 25g/m2～60g/m2。
The seedling raising paper is prepared by adopting the preparation method of the seedling raising paper.
The invention provides seedling raising paper pulp and a preparation method thereof, and seedling raising paper and a preparation method thereof, 1) first reinforcing fibers are added into the seedling raising paper pulp, so that the paper wet strength of the seedling raising paper can be enhanced, and the seedling raising paper has heat sealing performance, so that the automatic production of the seedling raising paper can be realized; 2) the addition of a small amount of second reinforcing fibers can further enhance the paper wet strength of the seedling paper and can also enhance the heat sealing effect of the seedling paper; 3) the wet strength agent and the wet strength agent accelerant in the paper pulp for raising seedlings are added in sequence, so that the paper wet strength of the paper for raising seedlings can be further enhanced; 4) the paper weight in the preparation method of the seedling raising paper is 25g/m2～60g/m2The heat sealing effect and the air permeability of the seedling raising paper can be further enhanced; 5) the air permeability of the seedling paper is further enhanced by using the pulped jute pulp fiber or pulped softwood fiber in combination with the untaped jute pulp fiber; 6) the plant fiber, the first reinforcing fiber and the second reinforcing fiber are added into the seedling raising paper pulp, the plant fiber belongs to natural fiber and can be degraded, and the first reinforcing fiber and the second reinforcing fiber can also be degraded, so that the seedling raising paper provided by the invention is environment-friendly and degradable, and the environment-friendly sustainable development is realized; 7) the paper is added with the hydrophilicity for modification,thereby obtaining the seedling raising paper with better hydrophilicity.
Detailed Description
In order to further illustrate the technical means and effects adopted by the invention to achieve the predetermined purpose, the following detailed description is made on the seedling raising paper pulp and the preparation method thereof, the seedling raising paper and the specific implementation mode, structure, characteristics and effects of the preparation method thereof provided by the invention in combination with the preferred implementation mode. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that when one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention provides a paper pulp for seedling raising, which comprises mixed fiber, a wet strength agent and a wet strength agent accelerator. The mass of the wet strength agent is 2% -15% of the mass of the mixed fiber, the mass of the wet strength agent promoter is 1% -10% of the mass of the mixed fiber, the mixed fiber comprises plant fiber, first reinforcing fiber and second reinforcing fiber, the mass percentage of the first reinforcing fiber in the mixed fiber is 20% -80%, the mass percentage of the second reinforcing fiber in the mixed fiber is less than or equal to 10%, the first reinforcing fiber is ES fiber, and the second reinforcing fiber comprises at least one of polylactic acid fiber, polybutylene succinate fiber, polyvinyl alcohol fiber and polybutylene adipate terephthalate fiber.
In one embodiment, the plant fibers are at least one of pulped and unpulped hemp pulp fibers.
In yet another embodiment, the plant fibers are pulped softwood fibers and unpulped hemp fibers.
Wherein the beating degree of the plant fiber is 20-50 DEG SR.
In one embodiment, the first reinforcing fiber accounts for 30% by mass of the mixed fiber, the wet strength agent accounts for 10% by mass of the mixed fiber, the wet strength agent promoter accounts for less than or equal to 2% by mass of the mixed fiber, and the beating degree of the plant fiber is 28 ° SR.
Preferably, the mass percentage of the second reinforcing fibers in the mixed fibers is less than or equal to 5%.
In one embodiment, the mass percentage of the first reinforcing fiber in the mixed fiber is 45%, the mass percentage of the second reinforcing fiber in the mixed fiber is 5%, the mass of the wet strength agent is 10%, the mass of the wet strength agent promoter is 2%, and the beating degree of the plant fiber is 38 ° SR.
In the embodiment, the wet strength agent promoter is a carboxymethyl cellulose solution, the substitution degree of the carboxymethyl cellulose is 0.2-1.2, and the substitution degree of the carboxymethyl cellulose is 0.9. The mass concentration of the carboxymethyl cellulose is 0.1-5%, preferably, the mass concentration of the carboxymethyl cellulose is 1%.
The invention also provides a preparation method of the paper pulp for raising seedlings, which comprises the following steps:
step S11: preparing the mixed fiber.
The composite fiber comprises a plant fiber, a first reinforcing fiber and a second reinforcing fiber, wherein the first reinforcing fiber accounts for 20-80% of the composite fiber by mass, the second reinforcing fiber accounts for less than or equal to 10% of the composite fiber by mass, the first reinforcing fiber is an ES fiber, and the second reinforcing fiber comprises at least one of a polylactic acid fiber, a polybutylene succinate fiber, a polyvinyl alcohol fiber and a polybutylene adipate terephthalate fiber.
In one embodiment, the plant fibers are at least one of pulped and unpulped hemp pulp fibers.
In yet another embodiment, the plant fibers are pulped softwood fibers and unpulped hemp fibers.
Wherein the beating degree of the plant fiber is 20-50 DEG SR. Preferably, the plant fiber has a freeness of 38 ° SR.
Preferably, the mass percentage of the second reinforcing fibers in the mixed fibers is less than or equal to 5%.
Step S12: adding a wet strength agent into the mixed fiber, and defibering the mixed fiber added with the wet strength agent to obtain defibered pulp; the mass of the wet strength agent is 2-15% of the mass of the mixed fiber.
In this embodiment, the wet strength agent is a high efficiency polyamide polyamine epichlorohydrin (PAE) wet strength agent.
Preferably, the mass of the wet strength agent is 10% of the mass of the mixed fibres.
Step S13: and (3) adding a prepared wet strength agent accelerator solution into the defibering pulp, and uniformly mixing to obtain the seedling raising pulp.
In the embodiment, the wet strength agent promoter is a carboxymethyl cellulose solution, the substitution degree of the carboxymethyl cellulose is 0.2-1.2, and the substitution degree of the carboxymethyl cellulose is 0.9. The mass concentration of the carboxymethyl cellulose is 0.1-5%, preferably, the mass concentration of the carboxymethyl cellulose is 1%.
In one embodiment, the first reinforcing fiber accounts for 30% by mass of the mixed fiber, the wet strength agent accounts for 10% by mass of the mixed fiber, the wet strength agent promoter accounts for 2% by mass of the mixed fiber, and the plant fiber has a beating degree of 28 ° SR.
In one embodiment, the mass percentage of the first reinforcing fiber in the mixed fiber is 45%, the mass percentage of the second reinforcing fiber in the mixed fiber is 5%, the mass of the wet strength agent is 10%, the mass of the wet strength agent promoter is 2%, and the beating degree of the plant fiber is 38 ° SR.
The invention also provides a preparation method of the seedling paper, which comprises the following steps:
step S10: preparing the paper pulp for seedling culture.
The preparation method of the paper pulp for raising seedlings comprises the steps S11-S13.
Step S20: pouring the paper pulp slurry for seedling culture into a paper making forming net for dewatering, squeezing, drying and hot pressing to finally obtain a dry paper web; immersing the hot-pressed dry paper web in a diluted hydrophilic agent solution to perform hydrophilic modification on the dry paper web; and taking out the dry paper web after hydrophilic modification and drying to obtain the seedling paper. Wherein the temperature of the dryer is 60-100 ℃.
In the present embodiment, in step S20, the temperature of the drying is 90 ℃.
Step S30: hot pressing the dry web.
Wherein the hot pressing temperature is 60-250 ℃. In the present embodiment, the temperature of the hot pressing is 135 ℃.
Step S40: immersing the hot pressed dry web in a dilute hydrophilizing agent solution to hydrophilically modify the dry web; and taking out the dry paper web after hydrophilic modification and drying to obtain the seedling paper.
In the present embodiment, in step S40, the temperature for drying is 100 ℃.
In the present embodiment, the hydrophilic agent is diluted by a factor of 10.
In this embodiment, the hydrophilic agent is DP-20, a supplier Zhang Jiagang, Debao chemical Co., Ltd.
Wherein the paper basis weight of the seedling raising paper is 25g/m2～60g/m2. Preferably, the paper basis weight of the seedling raising paper is 33g/m2～45g/m2。
The invention also provides seedling raising paper which is prepared by adopting the preparation method of the seedling raising paper.
The method for preparing the seedling paper of the present invention will be specifically described below by way of specific examples and comparative examples.
Example 1
Adopting unbleached hemp pulp as plant fiber, wherein the unbleached hemp pulp is prepared from first reinforcing fiber (70: 30) + 3% wet strength agent and 2% carboxymethyl cellulose (the wet strength agent and the carboxymethyl cellulose are added simultaneously), making 5 dry paper webs of 45 g/square meter, immersing the dry paper webs in a diluted hydrophilic agent solution, drying at 90 ℃, and transferring to a press machine at 130 ℃ for high-temperature melting for 1 minute. The resulting paper had a dry strength of 701.13N/m and a wet strength of 154N/m.
Example 2
Example 2 differs from example 1 in that: hemp pulp with a beating degree of 36 DEG SR is used as plant fiber, a wet strength agent and carboxymethyl cellulose are added in sequence, and the dry strength and the wet strength of the obtained paper are 952.38N/m and 420N/m respectively.
Example 3
The method comprises the steps of adopting hemp pulp as plant fibers, wherein the beating degree of the hemp pulp is 28 DEG SR, (28 DEG SR beating hemp pulp: a first reinforcing fiber is 70:30) + 10% of wet strength agent and 2% of carboxymethyl cellulose (the wet strength agent is added firstly, and then the carboxymethyl cellulose is added), then making 5 dry paper webs of 40 g/square meter, immersing the dry paper webs in a diluted hydrophilic agent solution, drying at 90 ℃, and transferring to a pressing machine of 130 ℃ for high-temperature melting for 1 minute. In example 3, the paper for growing seedlings had a dry strength of 683.12N/m and a wet strength of 550.33N/m.
Example 4
Example 4 differs from example 3 in that the mass percentage of ES fiber to plant fiber is 40%: 60 percent.
Example 5
Example 5 differs from example 3 in that the ES fibers: 50% of plant fiber by mass: 50 percent.
Example 6
Example 6 differs from example 3 in that the ES fibers: 60% of plant fiber by mass: 40 percent.
Example 7
Example 7 differs from example 3 in that the ES fibers: polyvinyl alcohol fibers: 60% of plant fiber by mass: 3%: 37 percent.
Example 8
Example 8 differs from example 3 in that the ES fibers: polyvinyl alcohol fibers: 65% of plant fiber by mass: 3%: 32 percent.
Example 9
Example 9 differs from example 4 in that the basis weight for paper making was 35g/m2。
Example 10
Example 10 differs from example 9 in that the ES fibers: 45% of plant fiber by mass: and 55 percent.
Example 11
Example 11 differs from example 9 in that the ES fiber: 50% of plant fiber by mass: 50 percent.
Example 12
Example 12 differs from example 9 in that the ES fiber: polyvinyl alcohol fibers: 45% of plant fiber by mass: 5%: 50 percent.
Example 13
Example 13 differs from example 12 in that the basis weight for paper making was 40g/m2。
Example 14
Example 14 differs from example 13 in that the ES fiber: polyvinyl alcohol fibers: 45% of plant fiber by mass: 10%: 45 percent.
Example 15
Example 15 differs from example 13 in that the ES fibers: polyvinyl alcohol fibers: 50% of plant fiber by mass: 5%: 45 percent.
Example 16
Example 16 differs from example 13 in that the ES fibers: polyvinyl alcohol fibers: 50% of plant fiber by mass: 10%: 40 percent.
Example 17
Example 17 differs from example 16 in that the ES fibers: 45% of plant fiber by mass: 55 percent, and the beating degree of the hemp pulp is 30 DEG SR.
Example 18
Example 18 differs from example 17 in that the freeness of the hemp pulp is 38 ° SR.
Example 19
Example 19 differs from example 17 in that the freeness of the hemp pulp is 48 ° SR.
Example 20
Example 20 differs from example 17 in that the ES fibers: polyvinyl alcohol fibers: 45% of plant fiber by mass: 5%: 50 percent, and the beating degree of the hemp pulp is 38 DEG SR.
Example 21
Example 21 differs from example 17 in that the ES fibers: polyvinyl alcohol fibers: 45% of plant fiber by mass: 5%: 50 percent, and the beating degree of the hemp pulp is 48 DEG SR.
The papers obtained in examples 4 to 21 were subjected to a paper property test, and the papers obtained in examples 4 to 8 were subjected to a heat sealing effect test. The test results of the paper property test are recorded in tables 1, 3-5. The test results of the heat-seal effect test are recorded in table 2.
TABLE 1
Figure BDA0002672427220000111
Figure BDA0002672427220000121
TABLE 2
Figure BDA0002672427220000122
TABLE 3
Figure BDA0002672427220000123
TABLE 4
Figure BDA0002672427220000124
TABLE 5
Figure BDA0002672427220000131
From examples 1-3, it is seen that the higher the wet strength agent content, the higher the wet strength of the paper, and that the addition of the wet strength agent in series with the carboxymethyl cellulose solution increases the wet strength of the paper.
As can be seen from Table 1, examples 4 to 8 had a molar ratio of 40g/m2The wet strength and the dry strength of the paper made by the paper basically meet the requirements, and the dry strength of the paper is continuously reduced and the water absorption value (brix value) is also continuously reduced along with the increase of the proportion of the first reinforced fiber.
As can be seen from table 2, the heat sealing effect of the paper is continuously improved with the increase of the first reinforcing fiber ratio. The proportion of 40 percent of the first reinforcing fibers is 33g/m in basis weight2In the case of (3), the heat sealing effect of the paper is good, and both the wet tensile index and the dry tensile index meet the requirements.
As can be seen from Table 3, the dry and wet tensile strengths of the sheets all decreased to different extents as the basis weights of the sheets decreased, and therefore the basis weights of the sheets could not be too low, and the final basis weights were 33 to 35g/m2The dry and wet tensile strength of the paper can meet the requirement.
As can be seen from table 4, the amount of the second reinforcing fibers is not too large, and 5% is effective for enhancing the wet tensile strength of the paper.
As can be seen from table 5, the improvement of the freeness is advantageous for the improvement of the wet and dry tensile strength of the paper, but the improvement of the wet tensile strength of the paper is not significant after the freeness is more than 38 ° SR, so the freeness of 38 ° SR is preferable, and the drying temperature of 135 ℃ is more advantageous for the improvement of the wet tensile strength of the paper than that of 130 ℃.
The invention provides seedling raising paper pulp and a preparation method thereof, and seedling raising paper and a preparation method thereof, 1) first reinforcing fibers are added into the seedling raising paper pulp, so that the paper wet strength of the seedling raising paper can be enhanced, and the seedling raising paper has heat sealing performance, so that the automatic production of the seedling raising paper can be realized; 2) the addition of a small amount of second reinforcing fibers can further enhance the paper wet strength of the seedling paper and can also enhance the heat sealing effect of the seedling paper; 3) the wet strength agent and the wet strength agent accelerant in the paper pulp for raising seedlings are added in sequence, so that the paper wet strength of the paper for raising seedlings can be further enhanced; 4) the paper weight in the preparation method of the seedling raising paper is 25g/m2～60g/m2The heat sealing effect and the air permeability of the seedling raising paper can be further enhanced; 5) the air permeability of the seedling paper is further enhanced by using the pulped jute pulp fiber or pulped softwood fiber in combination with the untaped jute pulp fiber; 6) the plant fiber, the first reinforcing fiber and the second reinforcing fiber are added into the seedling raising paper pulp, the plant fiber belongs to natural fiber and can be degraded, and the first reinforcing fiber and the second reinforcing fiber can also be degraded, so that the seedling raising paper provided by the invention is environment-friendly and degradable, and the environment-friendly sustainable development is realized; 7) the paper is modified by adding hydrophilicity, so that the seedling raising paper with good hydrophilicity is obtained.
Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (20)

1. A paper pulp for raising seedlings comprises mixed fibers and is characterized by also comprising a wet strength agent and a wet strength agent accelerator, the mass of the wet strength agent is 2-15% of the mass of the mixed fiber, the mass of the wet strength agent promoter is 1-10% of the mass of the mixed fiber, the mixed fiber comprises plant fiber, first reinforced fiber and second reinforced fiber, the mass percentage of the first reinforced fiber in the mixed fiber is 20-80%, the mass percentage of the second reinforcing fibers in the mixed fibers is less than or equal to 10%, the first reinforcing fiber is ES fiber, and the second reinforcing fiber comprises at least one of polylactic acid fiber, polybutylene succinate fiber, polyvinyl alcohol fiber and polybutylene adipate terephthalate fiber.
2. The pulp slurry for growing seedlings according to claim 1, wherein the plant fiber is at least one of pulped and unsized hemp pulp fiber.
3. The pulp slurry for raising seedlings according to claim 1, wherein the plant fiber is pulped softwood fiber and unsized hemp fiber.
4. The pulp for growing seedlings according to claim 1, wherein the plant fiber has a freeness of 20 ° SR to 50 ° SR.
5. The pulp slurry for raising seedlings according to claim 4, wherein the first reinforcing fiber accounts for 30% by mass of the mixed fiber, the plant fiber has a beating degree of 28 ° SR, the wet strength agent accounts for 10% by mass of the mixed fiber, and the wet strength agent accelerator accounts for 2% or less by mass of the mixed fiber.
6. The pulp slurry for raising seedlings according to claim 4, wherein the first reinforcing fiber accounts for 45% by mass of the mixed fiber, the second reinforcing fiber accounts for 5% by mass of the mixed fiber, the wet strength agent accounts for 10% by mass of the mixed fiber, the wet strength agent accelerator accounts for 2% or less by mass of the mixed fiber, and the plant fiber has a beating degree of 38 ° SR.
7. The paper pulp slurry for raising seedlings according to claim 1, wherein the wet strength agent promoter is a carboxymethyl cellulose solution, the substitution degree of the carboxymethyl cellulose is 0.2-1.2, and the mass concentration is 0.1-5%.
8. The pulp slurry for raising seedlings according to claim 1, wherein the mass percentage of the second reinforcing fibers in the mixed fiber is 10% or less.
9. A preparation method of paper pulp for raising seedlings is characterized by comprising the following steps:
preparing mixed fibers: the mixed fiber comprises plant fiber, first reinforced fiber and second reinforced fiber, wherein the mass percentage of the first reinforced fiber in the mixed fiber is 20-80%, the mass percentage of the second reinforced fiber in the mixed fiber is less than or equal to 10%, the first reinforced fiber is ES fiber, and the second reinforced fiber comprises at least one of polylactic acid fiber, polybutylene succinate fiber, polyvinyl alcohol fiber and polybutylene adipate terephthalate fiber;
adding a wet strength agent into the mixed fiber, adding water into the mixed fiber added with the wet strength agent, and defibering the slurry to obtain defibered slurry; the mass of the wet strength agent is 2-15% of the mass of the mixed fiber; and
and adding the prepared wet strength agent accelerator solution into the defibering pulp, and uniformly mixing to obtain the seedling raising pulp.
10. The method for preparing a paper pulp slurry for raising seedlings according to claim 9, wherein the plant fiber is pulped hemp pulp fiber.
11. The method for preparing a paper pulp slurry for raising seedlings according to claim 9, wherein the plant fiber is pulped hemp pulp fiber or unsized hemp pulp fiber.
12. The method for preparing a paper pulp slurry for raising seedlings according to claim 9, wherein the plant fiber is pulped softwood fiber and unsized hemp fiber.
13. The method for preparing paper pulp for raising seedlings according to claim 9, wherein the beating degree of the plant fiber is 20 ° SR to 50 ° SR.
14. The preparation method of paper pulp for raising seedlings according to claim 9, wherein the wet strength agent promoter is a carboxymethyl cellulose solution, the substitution degree of the carboxymethyl cellulose is 0.2-1.2, and the mass concentration is 0.1-5%.
15. The method for preparing paper pulp for raising seedlings according to claim 9, wherein the mass percentage of the second reinforcing fibers in the mixed fibers is less than or equal to 10%.
16. A preparation method of seedling paper is characterized by comprising the following steps:
preparing a paper pulp for raising seedlings by using the method for preparing the paper pulp for raising seedlings according to any one of claims 9 to 15;
pouring the seedling raising paper pulp into a papermaking forming net for dewatering, squeezing and drying to obtain a dry paper web;
hot pressing the dry web; and
immersing the hot pressed dry web in a dilute hydrophilizing agent solution to hydrophilically modify the dry web; and taking out the dry paper web after hydrophilic modification and drying to obtain the seedling paper.
17. The method for preparing paper for growing seedlings according to claim 16, wherein the temperature of the dryer is 60 to 100 ℃.
18. A method for preparing paper for growing seedlings according to claim 16, wherein the temperature of the hot pressing is 60 ℃ to 250 ℃.
19. The method for preparing paper for growing seedlings according to claim 16, wherein the basis weight of the paper for growing seedlings is 25g/m2～60g/m2。
20. A paper for raising seedlings, characterized in that the paper for raising seedlings is prepared by the method for preparing the paper for raising seedlings according to any one of claims 16 to 19.
CN202010937372.2A 2020-09-08 2020-09-08 Seedling raising paper pulp and preparation method thereof, and seedling raising paper and preparation method thereof Pending CN112127210A (en)

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CN107173109A (en) * 2017-06-19 2017-09-19 安徽春生农业科技有限公司 A kind of method that warm nursery paper is prepared by acid fiber by polylactic
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CN101613979A (en) * 2008-11-28 2009-12-30 富阳市钱旺纸业有限公司 A kind of production method of warm nursery paper
CN107173109A (en) * 2017-06-19 2017-09-19 安徽春生农业科技有限公司 A kind of method that warm nursery paper is prepared by acid fiber by polylactic
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