CN113416379B

CN113416379B - Organic covering pad and preparation method thereof

Info

Publication number: CN113416379B
Application number: CN202110781606.3A
Authority: CN
Inventors: 杨庆丽
Original assignee: Dongxiang International Technology Co ltd
Current assignee: Dongxiang International Technology Co ltd
Priority date: 2021-07-09
Filing date: 2021-07-09
Publication date: 2022-09-27
Anticipated expiration: 2041-07-09
Also published as: CN113416379A

Abstract

The application relates to the field of landscaping materials, and particularly discloses an organic covering mat and a preparation method thereof. The organic covering pad comprises, by weight, 10-20 parts of an organic covering, 5-10 parts of adhesive glue and 1-2 parts of a coagulant; the coagulant comprises ammonium chloride, calcium carbonate and plant powder; the preparation method comprises the following steps: s1, uniformly mixing the adhesive and the coagulant, adding the organic covering material, and uniformly mixing to obtain a mixture; and S2, carrying out hot-press molding on the mixture to obtain the organic covering mat. The organic covering pad has higher compressive strength, and the possibility of cracking under the action of pressure is lower.

Description

Organic covering pad and preparation method thereof

Technical Field

The application relates to the field of landscaping materials, in particular to an organic covering mat and a preparation method thereof.

Background

With the continuous development of society, the living standard of people is gradually improved, and the requirements of people on living environment are higher and higher, so that the urban landscaping is more and more important at present. The problem that the soil is exposed is mainly solved in the prior art, the exposed soil can not only influence the urban beauty, but also cause dust flying in windy weather, so that organic coverings for solving the problem of soil exposure are developed.

The organic mulch is usually made from organic waste, and is prepared by collecting, crushing, screening, sterilizing, and dyeing. Garden coverings made from fruit shells are generally poor in moisturizing performance; the garden mulch taking the phosphorus as the raw material has poor effect of improving the soil; organic mulch made of bark has a possibility of salinization of soil. In order to improve soil and enhance the moisturizing effect of organic mulch, research on organic mulch is being focused.

Chinese patent No. CN108841399A proposes an organic covering, which is prepared from raw materials including fertilizer, porous polyacrylic acid modified hydroxypropyl methylcellulose, pigment, vesuvianite particles, decomposing agent, zeolite, and modified melamine cyanurate. The organic covering has the effect of improving soil, but is easy to be dispersed by water flow in heavy rain after being laid, so people can shape the organic covering by adding colloid to prepare the organic covering mat, and the possibility of dispersing the organic covering in rainy days is greatly reduced. However, most organic covering mats have the problems of low compressive strength after being shaped and easy cracking after being trodden, and the service life of the organic covering mats is shortened.

With respect to the related art in the above, the inventors consider that: it is highly desirable to reduce the likelihood of cracking of the organic blanket under pressure.

Disclosure of Invention

In order to reduce the possibility of cracking of the organic covering mat under the action of pressure, the application provides the organic covering mat and the preparation method thereof.

In a first aspect, the present application provides an organic covering mat, which adopts the following technical scheme:

an organic covering pad is prepared from (by weight parts) organic covering 10-20, adhesive 5-10, and coagulating agent 1-2; the coagulant comprises ammonium chloride, calcium carbonate and plant powder.

By adopting the technical scheme, the organic covering mat is prepared by using the organic covering, the adhesive glue and the coagulant as raw materials, wherein the coagulant can promote the solidification and drying of the adhesive glue, the ammonium chloride and the plant powder in the coagulant can provide nutrient elements for plant growth, and the calcium carbonate can interact with the adhesive glue, so that the compressive strength of the organic covering mat is enhanced, and the possibility of cracking of the organic covering mat under the pressure action is reduced.

Preferably, the weight ratio of the ammonium chloride to the calcium carbonate to the plant powder is (2-5): (1-3): 2; more preferably, the weight ratio of the ammonium chloride to the calcium carbonate to the plant powder is 3:2: 2.

Preferably, the calcium carbonate is nano calcium carbonate.

By adopting the technical scheme, the nano calcium carbonate has high dispersibility, high compatibility with ammonium chloride and calcium carbonate, is beneficial to enhancing the stability of the organic covering mat, improves the compressive strength of the organic covering mat, and further reduces the possibility of cracking of the organic covering mat under certain pressure.

Preferably, the adhesive glue is a mixture of urea-formaldehyde resin and water, and the weight ratio of the urea-formaldehyde resin to the water is (2-4): (1-3).

By adopting the technical scheme, the urea-formaldehyde resin has low price and higher cohesiveness, and nutrient elements in the components can be dissolved in soil, thereby being beneficial to the growth of plants.

Preferably, the coagulant further comprises chitosan and polyethylene glycol.

By adopting the technical scheme, the polyethylene glycol is of a three-dimensional structure and can be compounded with chitosan, so that the stability of the organic covering material is further improved, the compressive strength of the organic covering pad is further improved, the possibility of cracking of the organic covering pad under the action of pressure is reduced, and the service life of the organic covering pad is prolonged.

Preferably, the weight ratio of the chitosan, the polyethylene glycol and the plant powder is (1-3): (0.5-1.2) 2; more preferably, the weight ratio of the chitosan, the polyethylene glycol and the plant powder is 2: 0.8:2.

By adopting the technical scheme, when the weight ratio of the chitosan to the polyethylene glycol to the plant powder is 2: when the ratio of chitosan to polyethylene glycol is 0.8:2, the interaction between chitosan and polyethylene glycol is stronger, the compressive strength of the organic covering mat is higher, and the possibility of cracking of the organic covering mat under the action of pressure is further reduced.

Preferably, the chitosan is a mixture of carboxymethyl chitosan and hydroxyethyl chitosan.

By adopting the technical scheme, the carboxymethyl chitosan and the hydroxyethyl chitosan have better water solubility, and the compatibility between the chitosan and the polyethylene glycol can be enhanced by compounding the carboxymethyl chitosan and the hydroxyethyl chitosan, so that the stability of the organic covering pad is improved, and the compressive strength of the organic covering pad is improved.

Preferably, the number average molecular weight of the polyethylene glycol is 2000-3000.

By adopting the technical scheme, when the number average molecular weight of the polyethylene glycol is 2000-3000, the viscosity of the polyethylene glycol is proper, and the compressive strength of the organic covering mat is enhanced more at the moment.

In a second aspect, the present application provides a method for preparing an organic covering mat, which adopts the following technical scheme:

a preparation method of an organic covering mat comprises the following preparation steps:

s1, uniformly mixing the adhesive and the coagulant, adding the organic covering material, and uniformly mixing to obtain a mixture;

and S2, hot-pressing the mixture to obtain the organic covering mat.

By adopting the technical scheme, the organic covering mat is prepared by hot-press forming, has the effect of promoting plant growth, has higher compressive strength, and reduces the possibility of cracking of the organic covering mat under the action of pressure.

Preferably, the hot-press molding temperature is 80-120 ℃, and the hot-press time is 20-50 min.

In summary, the present application includes at least one of the following beneficial technical effects:

1. according to the application, the organic covering mat is prepared by using the organic covering, the adhesive and the coagulant as raw materials, and the calcium carbonate can interact with the adhesive, so that the compressive strength of the organic covering mat is enhanced, and the possibility of cracking of the organic covering mat under the action of pressure is reduced;

2. the nano calcium carbonate is preferably used as a raw material of a preparation example of the coagulant, and has high dispersibility, high compatibility with ammonium chloride and calcium carbonate, benefit for enhancing the stability of the organic covering mat and improving the compressive strength of the organic covering mat;

3. according to the application, chitosan and polyethylene glycol are preferably added into the coagulant, and the polyethylene glycol is of a three-dimensional structure and can be compounded with the chitosan, so that the stability of the organic covering is further improved, and the compressive strength of the organic covering mat is further improved.

Detailed Description

The present application will be described in further detail with reference to the following preparation examples and examples, wherein the organic coating used in the present application is an O-series wood coating obtained from international scientific and technological co.

TABLE 1 sources of raw materials for this application

Preparation example of coagulant

Preparation example 1

A coagulant is prepared by the following steps: 300g of ammonium chloride, 250g of calcium carbonate and 200g of plant powder are mixed uniformly to prepare the coagulant.

Preparation example 2

Preparation 2 is based on preparation 1, and differs from preparation 1 only in that: 200g of ammonium chloride, 300g of calcium carbonate and 200g of plant powder are used.

Preparation example 3

Preparation 3 is based on preparation 1, differing from preparation 1 only in that: the ammonium chloride used was 500g, the calcium carbonate used was 100g, and the plant powder used was 200 g.

Preparation example 4

Preparation 4 is based on preparation 1, differing from preparation 1 only in that: the ammonium chloride used was 300g, the calcium carbonate used was 200g, and the plant powder used was 200 g.

Preparation example 5

Preparation 5 is based on preparation 4 and differs from preparation 4 only in that: the calcium carbonate is replaced by nano calcium carbonate with equal mass.

Preparation example 6

Preparation 6 is based on preparation 5, differing from preparation 5 only in that: the raw materials for preparing the coagulant also comprise chitosan and polyethylene glycol, and the specific preparation method comprises the following steps: uniformly mixing 300g of ammonium chloride, 200g of calcium carbonate, 200g of plant powder, 200g of chitosan and 80g of polyethylene glycol to prepare a coagulant; the chitosan is carboxymethyl chitosan; the polyethylene glycol used was PEG 1000.

Preparation example 7

Preparation 7 is based on preparation 6 and differs from preparation 6 only in that: the weight ratio of the chitosan, the polyethylene glycol and the plant powder is 1:0.5: 2.

Preparation example 8

Preparation 8 is based on preparation 6 and differs from preparation 6 only in that: the weight ratio of the chitosan, the polyethylene glycol and the plant powder is 3:1.2: 2.

Preparation example 9

Preparation 9 is based on preparation 6 and differs from preparation 6 only in that: the polyethylene glycol used was PEG 2000.

Preparation example 10

Preparation 10 is based on preparation 6 and differs from preparation 6 only in that: the polyethylene glycol used was PEG 3000.

Preparation example 11

Preparation 11 is based on preparation 6 and differs from preparation 6 only in that: the polyethylene glycol used was PEG 4000.

Preparation example 12

Preparation 12 is based on preparation 10, and differs from preparation 10 only in that: hydroxyethyl chitosan with equal mass is used to replace carboxymethyl chitosan.

Preparation example 13

Preparation 13 is based on preparation 12 and differs from preparation 12 only in that: the chitosan is a mixture of carboxymethyl chitosan and hydroxyethyl chitosan, and the weight ratio of the carboxymethyl chitosan to the hydroxyethyl chitosan is 1: 3.

Preparation example 14

Preparation 14 is based on preparation 13, differing from preparation 13 only in that: the weight ratio of the carboxymethyl chitosan to the hydroxyethyl chitosan is 5: 1.

Comparative preparation example

Comparative preparation example 1

Comparative preparation example 1 is based on preparation example 1, differing from preparation example 1 only in that: equal mass of ammonium chloride was substituted for calcium carbonate.

Examples

Example 1

An organic covering mat, the preparation method comprises the following preparation steps:

s1, mixing 94g of adhesive glue and 18g of coagulant uniformly, adding 183g of organic covering, and mixing uniformly to obtain a mixture;

s2, hot-pressing the mixture at 10Kpa and 103 ℃ for 30min to obtain an organic covering pad;

the coagulant used was from preparation example 1; the adhesive is prepared by mixing urea-formaldehyde resin and water in a weight ratio of 3: 2.

Examples 2 to 3

Examples 2 to 3 are based on example 1 and differ from example 1 only in that: the preparation conditions of the organic covering pad are different, and the details are shown in Table 2.

TABLE 2 preparation conditions of examples 1 to 3

Examples 4 to 16

Examples 4 to 16 are based on example 1 and differ from example 1 only in that: the source of the coagulant used varies and is shown in Table 3.

TABLE 3 examples 4-16 coagulant sources

Examples	Source of coagulant
		Example 4	Preparation example 2
Example 5	Preparation example 3
		Example 6	Preparation example 4
Example 7	Preparation example 5
		Example 8	Preparation example 6
Example 9	Preparation example 7
		Example 10	Preparation example 8
Example 11	Preparation example 9
		Example 12	Preparation example 10
Example 13	Preparation example 11
		Example 14	Preparation example 12
Example 15	Preparation example 13
		Example 16	Preparation example 14

Comparative example

Comparative example 1

Comparative example 1 is based on example 1 and differs from example 1 only in that: the coagulant is replaced by the adhesive glue with equal quality.

Comparative example 2

Comparative example 2 is based on example 1 and differs from example 1 only in that: the adhesive glue is replaced by the coagulant with equal mass.

Comparative example 3

Comparative example 3 is based on example 1 and differs from example 1 only in that: the coagulant used was derived from comparative preparation example 1.

Comparative example 4

A coagulant is prepared by uniformly mixing DY-553 type urea-formaldehyde resin rubber powder and water according to a weight ratio of 5:3 to prepare 94g of adhesive glue, then uniformly mixing the adhesive glue and 18g of ammonium chloride coagulant, then adding 183g of organic covering and uniformly mixing to prepare a mixture, and curing the mixture for 10 hours under the pressure of 10KPa to prepare an organic covering mat.

Performance test

The following performance tests were performed on the organic covering mats obtained in examples 1 to 16 and comparative examples 1 to 4, respectively.

And (3) testing the compressive strength: the compressive strength of the organic covering mats prepared in the examples 1-16 and the comparative examples 1-4 is respectively tested according to the regulations of GB/T17657-2013 (a method for testing the physical and chemical properties of the artificial board and the decorative artificial board), and the test results are shown in Table 4.

And (3) testing water permeability: the prepared organic covering mat is cut into a test piece with the diameter of 15cm, waterproof glue with the thickness of 5mm is coated on the side wall of the test piece, the test piece coated with the waterproof glue is placed into a stainless steel round pipe with the inner diameter of 15.5mm, the test piece completely blocks a pipe orifice at one end of the stainless steel pipe, the stainless steel round pipe is placed for 24 hours, 500g of water is injected from a pipe orifice at the other end of the stainless steel pipe, the weight of water penetrating within 15min is tested, the percentage of the water penetrating within 15min to 500g of water is calculated, the calculation result is recorded as water permeability, the higher the water permeability is, the waterproof glue used for testing is YH-8322, the waterproof glue is purchased from Shanggi New Material science and technology Limited, the stainless steel pipe used is 25cm in length and is ordered from the Steel industry in morning, and the test result is shown in Table 4.

Testing the nutritional impact on soil: the method comprises the steps of taking natural soil of Beijing three hectare garden nursery gardens, naturally drying the soil, screening the soil by a 2mm sieve, putting the soil into flowerpots with the upper diameter of 15cm, the lower diameter of 10cm and the height of 15cm, covering the soil in the flowerpots by organic covering mats of examples 1-16 and comparative examples 1-4 respectively, treating the soil in a non-Covering (CK) mode as a comparison mode, enabling the thickness of the covering mats to be 3cm, collecting and analyzing soil samples after covering for 6 months respectively, and obtaining analysis results shown in the table 4.

TABLE 4 test results of examples 1 to 16 and comparative examples 1 to 4

The analysis of the data shows that the curing time of the organic covering mat prepared by the method is short, the time cost during production is greatly saved, the organic covering mat has high alkaline nitrogen hydrolysis, the coagulant can promote the solidification and drying of the adhesive glue, ammonium chloride and plant powder in the coagulant can provide nutrient elements for plant growth, the compression strength of the organic covering mat prepared by the method is not lower than 0.79MPa, the water permeability is high, and the analysis of the data of the examples 1 to 3 shows that the example 1 is the best example among the examples 1 to 3.

As can be seen from the analysis of the data of example 1 and comparative examples 1 to 3, when no adhesive, coagulant or calcium carbonate is added to the organic coating mat, the compressive strength of the organic coating mat is low, while when the adhesive and coagulant are added simultaneously, the compressive strength of the coating mat is significantly improved, which indicates that calcium carbonate can interact with the adhesive, enhance the compressive strength of the organic coating mat, and reduce the possibility of cracking of the organic coating mat under the pressure.

Analysis of the data from example 6 and example 1 shows that when the weight ratio of ammonium chloride, calcium carbonate and plant powder in the raw materials for preparing the coagulant is 3:2:2, the compressive strength of the resulting organic coating mat is improved, and the organic coating mat is less likely to crack under pressure.

Analysis of the data of examples 7 and 6 shows that when nano calcium carbonate is used instead of calcium carbonate, the compressive strength of the prepared organic covering mat is further improved, which indicates that the dispersibility of the calcium carbonate is higher, the compatibility with ammonium chloride and calcium carbonate is higher, the stability of the organic covering mat is enhanced, the compressive strength of the organic covering mat is improved, and the possibility of cracking of the organic covering mat under a certain pressure is further reduced.

Analysis of the data of examples 8-10 and 7 shows that when chitosan and polyethylene glycol are added to the raw materials for preparing the coagulant, the compressive strength of the prepared organic covering is improved, which indicates that the polyethylene glycol is of a three-dimensional structure and can be compounded with the chitosan, so that the stability of the organic covering is further improved, the compressive strength of the organic covering mat is further improved, the possibility of cracking of the organic covering mat under the action of pressure is reduced, and the service life of the organic covering mat is prolonged. Comparing the data of example 8 with examples 9-10, it can be seen that when the weight ratio of chitosan, polyethylene glycol and plant powder is 2: at 0.8:2, the compressive strength of the organic covering mat is higher, and the organic covering mat is less likely to crack under the action of pressure.

Analysis of the data of examples 11-12, 13 and 8 shows that when the number average molecular weight of the polyethylene glycol in the coagulant preparation raw material is 1000 or 4000, the compressive strength of the prepared organic coating mat is significantly lower than that of the polyethylene glycol of 2000-3000, which means that when the number average molecular weight of the polyethylene glycol is 2000-3000, the viscosity of the polyethylene glycol is appropriate, and the compressive strength of the organic coating mat is enhanced more.

Analysis of the data of examples 15-16, 14 and 12 shows that when carboxymethyl chitosan or hydroxyethyl chitosan is used alone to prepare the coagulant, the compressive strength of the prepared organic covering mat is higher than that of the organic covering mat when carboxymethyl chitosan and hydroxyethyl chitosan are mixed to prepare the coagulant, which indicates that carboxymethyl chitosan and hydroxyethyl chitosan have better water solubility, and the combination of carboxymethyl chitosan and hydroxyethyl chitosan can enhance the compatibility between chitosan and polyethylene glycol, improve the stability and compressive strength of the organic covering mat, reduce the possibility of cracking of the organic covering mat under the pressure, and prolong the service life of the organic covering mat.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims

1. An organic covering pad is characterized in that the preparation raw materials comprise, by weight, 10-20 parts of an organic covering, 5-10 parts of adhesive glue and 1-2 parts of a coagulant; the coagulant comprises ammonium chloride, calcium carbonate and plant powder;

the coagulant also comprises chitosan and polyethylene glycol;

the weight ratio of the chitosan to the polyethylene glycol to the plant powder is (1-3): (0.5-1.2) 2;

the chitosan is a mixture of carboxymethyl chitosan and hydroxyethyl chitosan.

2. The organic covering mat as claimed in claim 1, wherein: the weight ratio of the ammonium chloride to the calcium carbonate to the plant powder is (2-5): (1-3): 2.

3. the organic covering mat as claimed in claim 1, wherein: the calcium carbonate is nano calcium carbonate.

4. The organic covering mat as claimed in claim 1, wherein: the adhesive glue is a mixture of urea-formaldehyde resin and water, and the weight ratio of the urea-formaldehyde resin to the water is (2-4): (1-3).

5. The organic covering mat as claimed in claim 1, wherein: the number average molecular weight of the polyethylene glycol is 2000-3000.

6. The method for preparing an organic covering mat as set forth in any one of claims 1 to 5, comprising the steps of:

and S2, carrying out hot-press molding on the mixture to obtain the organic covering mat.

7. The method of claim 6, wherein the step of preparing the organic covering mat comprises: the hot-press molding temperature is 80-120 ℃, and the hot-press time is 20-50 min.