Chitosan-based mycelium leather finishing agent, preparation method and application thereof

Abstract

This invention belongs to the field of mycelial fiber-based leather material production, specifically relating to a chitosan-based mycelial leather finishing agent and its application method. This invention involves grafting and copolymerizing any one of glucose, cyclodextrin, or amino acids with a chitosan-based material, followed by blending with at least one of collagen, sodium alginate, or konjac gum to obtain a chitosan-based mycelial leather finishing agent. This invention can be used as a base layer or intermediate layer in the finishing stage, improving the strength and toughness of mycelial leather blanks, resulting in a more aesthetically pleasing appearance, a matte finish, a soft and natural feel, and an appearance similar to traditional leather, thus meeting everyday application needs.

Description

Technical Field

[0001] This invention belongs to the field of mycelium fiber-based leather material production, specifically relating to a chitosan-based mycelium leather coating agent, its preparation method, and its application. Background Technology

[0002] Traditional leather production causes severe environmental pollution, leading to a growing demand for environmentally friendly leather-like materials. In recent years, a range of plant-based leather-like materials have been developed; however, compared to plant-based fibers, mycelial fibers are more similar to leather collagen fibers.

[0003] Similar microscopic characteristics, high growth efficiency, and easy directional control. Traditional leather finishing agents are a general term for a class of auxiliaries used to coat, protect, and beautify leather surfaces. Their use can increase the appearance of leather, extend its service life, significantly improve the quality and grade of leather products, and increase commercial value. However, due to the significant differences between the composition of mycelium and the collagen fiber composition of conventional leather, finishing agents used for traditional leather are prone to peeling and delamination when applied to mycelial leather blanks. Based on this, this method utilizes chitosan-based materials to prepare finishing agents that can be used for mycelial leather, and can be applied to the top coating and intermediate coating stages in mycelial leather production. Because chitosan-based materials have good affinity with mycelial fibers, they can effectively improve the performance of mycelial leather. Summary of the Invention

[0004] The purpose of this invention is to provide a chitosan-based mycelial leather finishing agent, its preparation method, and its application. The chitosan-based material is used in the preparation of the mycelial leather finishing agent, which can be used as a base layer or intermediate layer for the base coat and intermediate coat in the finishing stage, improving the strength and toughness of the mycelial leather blank and making the surface of the mycelial leather blank soft.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for preparing a chitosan-based mycelium leather finishing agent includes the following steps:

[0007] (1) Dissolution: Under stirring conditions, the chitosan-based material is dissolved in a solvent to obtain a homogenized chitosan-based material; when the chitosan-based material is high-deacetylated chitosan, carboxymethyl chitosan, chitosan hydrochloride or chitosan quaternary ammonium salt, the solvent is deionized water; when the chitosan-based material is low-deacetylated chitosan, the solvent is a dilute acetic acid solution or dilute hydrochloric acid solution with a volume fraction of 0.5%-1.2%.

[0008] (2) Modification: Add bio-based material A to the homogenized chitosan-based material obtained in step (1), stir until completely dissolved, adjust the pH and then perform graft copolymerization to obtain solution A; the bio-based material A is any one of glucose, cyclodextrin and amino acids;

[0009] (3) Composite: After adjusting the pH of solution A, bio-based material B is added to solution A and mixed and stirred to obtain chitosan-based mycelial leather coating agent; the bio-based material B is at least one of collagen, sodium alginate and konjac gum.

[0010] Preferably, in step (1), the solid-liquid ratio of chitosan-based material to solvent is 1:20-1:160.

[0011] Preferably, in step (2), the mass ratio of chitosan-based material to bio-based material A is 1:2-1:5, the pH is adjusted to 3-7, the graft copolymerization temperature is 40 ℃-90 ℃, and the graft copolymerization time is 4 h-72 h.

[0012] Preferably, in step (3), the pH of solution A is adjusted to 6-8; the mass ratio of chitosan-based material to bio-based material B is 1:1-1:10; the blending temperature is 50 ℃-70 ℃; and the blending time is 2 h-24 h.

[0013] This invention also includes the application of the above-mentioned chitosan-based mycelial leather finishing agent in the mycelial leather base layer, the specific steps of which are as follows:

[0014] Water, chitosan-based coating agent, crosslinking agent and pigment paste are compounded and then evenly distributed on the surface of mycelium leather blank by roller coating or spraying, and then dried.

[0015] Preferably, the ingredients are: 200-350 parts water, 30-100 parts chitosan-based coating agent, 0-100 parts crosslinking agent, 0-50 parts pigment paste, drying temperature 25℃-120℃, and drying time 5 min-24 h.

[0016] This invention also includes the application of chitosan-based mycelial leather finishing agents in the middle layer of mycelial leather, with the specific steps as follows:

[0017] Water, chitosan coating agent, dye water and other film-forming materials are combined and then evenly distributed on the surface of mycelium leather blanks by roller coating or spraying, and then dried.

[0018] Preferably, the composition is 350-600 parts water, 50-70 parts chitosan coating agent, 0-30 parts dye water, 0-50 parts other film-forming materials, and a drying temperature of 25℃-120℃.

[0019] Compared with the prior art, the present invention has the following advantages:

[0020] (1) The chitosan-based mycelium leather coating agent provided by the present invention makes mycelium fiber-based leather materials look beautiful, have a matte effect, and feel soft and natural. In appearance, they are similar to traditional leather and can meet the needs of daily applications.

[0021] (2) Compared with conventional leather tanning auxiliaries, the chitosan-based mycelium leather coating agent of the present invention has better affinity with mycelium fibers and is less prone to delamination and peeling; and has better biodegradability. Attached Figure Description

[0022] Figure 1 This is an image showing the effect of the mycelial leather after coating in Example 1;

[0023] Figure 2 This is a picture of the mycelium leather product after coating in Example 1. Detailed Implementation

[0024] The following examples further illustrate the above-mentioned content of the present invention, but do not limit the scope of the present invention.

[0025] Example 1

[0026] A method for preparing a chitosan-based mycelium leather finishing agent

[0027] (1) Weigh 5.0 g of carboxymethyl chitosan, dissolve it in deionized water under stirring, and make up to 250 ml to make the chitosan solution concentration 20 mg / ml, so as to obtain homogenized chitosan-based material;

[0028] (2) Add β-cyclodextrin (12.0 g) to the homogenized chitosan-based material in step (1), with a total volume of 500 mL; react at 85 °C for 1 h until completely dissolved (the solution pH is 6-7), then cool to 60 °C and continue the reaction for 4 h to obtain solution A;

[0029] (3) Adjust the pH of solution A to 8, add 10 g of collagen at 50°C, and continue stirring for 2 h to obtain chitosan-based mycelial leather coating agent.

[0030] The obtained coating agent was applied to a polytetrafluoroethylene plate and dried at room temperature to form a film. Its tensile strength was measured to be 0.82 MPa.

[0031] Application of chitosan-based mycelial leather finishing agents in the base layer of mycelial leather

[0032] The coating agent obtained by the above preparation method was mixed in a spray bottle according to the following mass ratio: 80 parts chitosan coating agent, 200 parts water, and 10 parts crosslinking agent. The mixture was then sprayed onto the surface of the mycelial leather as a base layer and dried at 100 ℃ for 5 min. The tensile strength of the mycelial leather was measured to be 8.14 MPa.

[0033] Example 2:

[0034] (1) Weigh 10.0 g of low-deacetylation chitosan and dissolve it in 0.8% acetic acid solution under stirring to make the chitosan solution concentration 10 mg / ml, and obtain homogenized chitosan-based material;

[0035] (2) Add glucose (20.0g) to the homogenized chitosan-based material obtained in step (1) and stir until completely dissolved; adjust the pH of the solution to 5.5 and react at 65 °C for 72 h to obtain solution A.

[0036] (3) Adjust the pH of solution A to 8, add 10 g of collagen at 55 ℃, and continue stirring for 2 h to obtain chitosan-based mycelial leather coating agent.

[0037] Application of chitosan-based mycelial leather finishing agents in the base layer of mycelial leather

[0038] After mixing 100 parts of the obtained coating agent with 200 parts of water evenly, the mixture was applied as a base layer to the surface of the mycelium-based leather and then roller-coated. The mixture was dried at 100 °C for 15 min and allowed to soften at room temperature. The strength of the mycelium-based leather material after coating was measured to be 8.53 MPa.

[0039] Example 3:

[0040] (1) Weigh 5.0 g of low-deacetylation chitosan and dissolve it in 0.8% dilute acetic acid solution under stirring to make the chitosan solution concentration 10 mg / ml, and obtain homogenized chitosan-based material;

[0041] (2) Add 10.0 g of glucose to the homogenized chitosan-based material obtained in step (1) and stir until completely dissolved (the solution pH is 6-7). React at 65 °C for 72 h to obtain solution A;

[0042] (3) Adjust the pH of solution A to 6.5, add 5g sodium alginate and 5g collagen to solution A and mix. Stir at 55℃ for 2 h to obtain chitosan-based mycelium leather coating agent.

[0043] The obtained solution was poured into a petri dish and dried at 40 °C for 6 h, then allowed to soften at room temperature. Its tensile strength was measured to be 0.61 MPa.

[0044] Application of chitosan-based mycelial leather finishing agents in the middle layer of mycelial leather

[0045] A composite material consisting of 350 parts water, 70 parts chitosan coating agent, 30 parts natural resin, and 5 parts dye water was used in the intermediate layer. The drying temperature was 100 ℃, and the drying time was 10 min. The tensile strength of the mycelium-derived leather after coating was measured to be 9.07 MPa.

Claims

1. A method for preparing a chitosan-based mycelial leather finishing agent, characterized in that, The preparation method includes the following steps: (1) Dissolution: Under stirring conditions, the chitosan-based material is dissolved in a solvent to obtain a homogenized chitosan-based material; when the chitosan-based material is high-deacetylated chitosan, carboxymethyl chitosan, chitosan hydrochloride or chitosan quaternary ammonium salt, the solvent is deionized water; when the chitosan-based material is low-deacetylated chitosan, the solvent is a dilute acetic acid solution or a dilute hydrochloric acid solution with a volume fraction of 0.5%-1.2%. (2) Modification: Add bio-based material A to the homogenized chitosan-based material obtained in step (1), stir until completely dissolved, adjust the pH and then perform graft copolymerization to obtain solution A; the bio-based material A is any one of glucose, cyclodextrin and amino acids; (3) Composite: After adjusting the pH of solution A, bio-based material B is added to solution A and mixed and stirred to obtain chitosan-based mycelial leather coating agent; the bio-based material B is at least one of collagen, sodium alginate and konjac gum.

2. The preparation method according to claim 1, characterized in that, In step (1), the solid-liquid ratio of chitosan-based material to solvent is 1:20-1:

160.

3. The preparation method according to claim 1, characterized in that, In step (2), the mass ratio of chitosan-based material to bio-based material A is 1:2-1:5, the pH is adjusted to 3-7, the graft copolymerization temperature is 40 ℃-90 ℃, and the graft copolymerization time is 4 h-72 h.

4. The preparation method according to claim 1, characterized in that, In step (3), the pH of solution A is adjusted to 6-8; the mass ratio of chitosan-based material to bio-based material B is 1:1-1:10, the blending temperature is 50 ℃-70 ℃, and the blending time is 2h-24h.

5. A chitosan-based mycelial leather finishing agent obtained by the preparation method according to any one of claims 1-4.

6. The application of the chitosan-based mycelial leather finishing agent as described in claim 5 in the mycelial leather base layer, characterized in that, The specific steps are as follows: Water, chitosan-based coating agent, crosslinking agent and pigment paste are compounded and then evenly distributed on the surface of mycelium leather blank by roller coating or spraying, and then dried.

7. The application of the chitosan-based mycelial leather finishing agent according to claim 6 in the mycelial leather base layer, characterized in that, The ingredients are: 200-350 parts water, 30-100 parts chitosan-based coating agent, 0-100 parts crosslinking agent, and 0-50 parts pigment paste; drying temperature: 25℃-120℃; drying time: 5 min-24 h.

8. The application of the chitosan-based mycelial leather finishing agent as described in claim 5 in the middle layer of mycelial leather, characterized in that, The specific steps are as follows: Water, chitosan coating agent, dye water and other film-forming materials are combined and then evenly distributed on the surface of mycelium leather blanks by roller coating or spraying, and then dried.

9. The application of the chitosan-based mycelial leather finishing agent according to claim 8 in the middle layer of mycelial leather, characterized in that, The mixture contains 350-600 parts water, 50-70 parts chitosan coating agent, 0-30 parts dye water, and 0-50 parts other film-forming materials, with a drying temperature of 25℃-120℃.

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