Oil-tea meal-based formaldehyde-free self-mildew-proof water-resistant adhesive

A technology of camellia oleifera meal and adhesive, applied in the direction of adhesive, adhesive type, protein adhesive, etc., can solve the problems of complex protein process, difficult to promote production, environmental pollution, etc., achieve rich sources and reduce VOC release , the effect of reducing production costs

Pending Publication Date: 2022-06-24
BEIJING FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0007] The protein process is complicated, the cost is high, and the practicability is poor; for example, in the invention patent of publication number CN102295902A, a method for extracting camellia oleifera meal protein and grafting maleic anhydride to prepare protein adhesive is disclosed; this research improves Vegetable protein adhesives have shortcomings such as fast pre-curing and easy mildew; in the patents of publication numbers CN110079269A and CN107641495A, researchers used chemical cross-linking agents such as protein denaturants and alkalis to modify the protein in camellia oleifera, The wet bonding strength of the modified adhesive has reached the national standard for Class II plywood; in the patent of Publication No. CN110499141A, a method for modifying the camellia oleifera meal protein adhesive with a biomass cross-linking agent is disclosed; this method improves Improve the curing stability of the adhesive and improve the water-resistant bonding strength of the adhesive
[0008] Although the adhesive prepared by using camellia oleifera protein will not release formaldehyde, a large number of chemical modifiers will be used in the current research to release VOC, which will also cause environmental pollution; this patent finds after the analysis of the components of camellia oleifera, The protein content in camellia oleifera meal is only about 10%, but it contains more than 45% polysaccharides and 15% tea saponin. Therefore, only a small amount of protein in camellia oleifera meal is purified and modified to prepare adhesives. Not only is the process complicated, And the cost is high, it is difficult to popularize the production in a large area; at present, there is no research in China to use the polysaccharides and tea saponin in the camellia oleifera to prepare woodworking adhesives; Well, the formaldehyde-free camellia oleifera woodworking adhesive with self-mold resistance can reduce the waste of resources while promoting the development of biomass adhesives, increase the added value of abandoned crops, and promote the upgrading of the wood-based panel industry. and social significance

Method used

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  • Oil-tea meal-based formaldehyde-free self-mildew-proof water-resistant adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The specific steps for the preparation of a formaldehyde-free self-mildew-proof and water-resistant adhesive based on camellia oil meal are as follows:

[0034] (1) Mix 8 g of melamine, 4 g of KOH, 50 g of water and 40 g of camellia oleifera meal, add it to a 250 mL three-necked flask equipped with a stirrer, and raise the water bath to 60°C under stirring at 350 rpm, and react for 20 min. , continue to stir the solution at room temperature to obtain liquefied camellia meal;

[0035] (2) Add 0.2 g of copper sulfate and 5 g of potassium peroxide to the liquefied camellia oil solution, stir for 1 h, cool to room temperature, and adjust the pH to 7 to obtain oxidized modified camellia oil;

[0036] (3) Add 2g of polymethylenediamine to 100g of water and stir for 20min;

[0037] (4) Continue to add 15 g of modified camellia oil to the system, stir at 50 °C for 40 min, and then add 10 g of epichlorohydrin;

[0038] (5) Finally, 15 g of soybean meal was added, and stirring ...

Embodiment 2

[0040] The specific steps for the preparation of a formaldehyde-free self-mildew-proof and water-resistant adhesive based on camellia oil meal are as follows:

[0041] (1) Mix 8 g of urea, 6 g of NaOH, 60 g of water and 50 g of camellia oleifera meal, add it to a 250 mL three-necked flask equipped with a stirrer, raise the water bath to 80 °C under stirring at 400 rpm, and react for 40 min. Continue to stir the solution at normal temperature to obtain liquefied camellia meal;

[0042] (2) Add 1 g of aluminum sulfate and 25 g of calcium peroxide to the liquefied camellia oil solution, stir for 1.5 h, cool to room temperature, and adjust the pH to 8 to obtain oxidatively modified camellia oil;

[0043] (3) Add 3g polyethyleneimine to 100g water and stir for 30min;

[0044] (4) Continue to add 25 g of modified camellia oil to the system, stir at 80°C for 40 min, and then add 8 g of 1,6-hexanediol diglycidyl ether;

[0045] (5) Finally, add 5 g of soybean meal and continue stirrin...

Embodiment 3

[0047] The specific steps for the preparation of a formaldehyde-free self-mildew-proof and water-resistant adhesive based on camellia oil meal are as follows:

[0048] (1) Mix 5 g of melamine, 4 g of KOH, 50 g of water and 20 g of camellia oleifera meal, add it to a 250 mL three-necked flask equipped with a stirrer, raise the water bath to 40 °C under stirring at 350 rpm, and react for 15 min. Continue to stir the solution at normal temperature to obtain liquefied camellia meal;

[0049] (2) Add 0.2 g of sodium sulfate and 5 g of hydrogen peroxide to the liquefied camellia oleifera meal solution and stir for 1 h, cool to room temperature, and adjust the pH to 6.5 to obtain oxidized modified camellia oleifera meal;

[0050] (3) Add 1g polyethyleneimine to 50g water and stir for 20min;

[0051] (4) Continue to add 10 g of modified camellia meal to the system, stir at 45°C for 20 min, and then add 8 g of epichlorohydrin;

[0052] (5) Finally, add 20 g of soybean meal and contin...

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Abstract

The invention relates to the technical field of woodworking adhesives for artificial boards, and particularly discloses an oil-tea-meal-based formaldehyde-free self-mildew-proof water-resistant adhesive and a preparation method of the oil-tea-meal-based formaldehyde-free self-mildew-proof water-resistant adhesive. The aldehyde-free adhesive is prepared by reacting the oil-tea meal with the soybean meal, the reinforcing agent and the cross-linking agent through modification methods such as liquefaction and oxidation. The oil-tea meal-based adhesive provided by the invention solves the problems that the existing biomass adhesive is poor in water resistance, is easily corroded by microorganisms, and causes no pollution to the environment due to the use of a large amount of chemical cross-linking agents. Effective components such as polysaccharide and tea saponin in the oil-tea meal are fully utilized, the modified oil-tea meal partially replaces soybean meal, a self-crosslinking network structure is formed in a system, the use of a chemical crosslinking agent is reduced while the water-resistant bonding strength of the adhesive is improved, VOC emission is reduced, the adhesive has excellent self-mildew-proof performance, and the service life of the adhesive is prolonged. The woodworking adhesive for the artificial board is formaldehyde-free, low in cost, high in performance and easy to realize industrial production.

Description

technical field [0001] The invention relates to the technical field of woodworking adhesives for wood-based panels, in particular to an aldehyde-free self-mildew-proof and water-resistant adhesive based on camellia meal. Background technique [0002] With the depletion of oil reserves and the increasingly serious environmental problems, environmentally friendly wood composite materials have gradually become an important material for people's furniture; and currently the adhesives used in my country's wood-based panels are still "trialdehyde" (urea-formaldehyde resin, urea-formaldehyde resin, Phenolic resins and melamine formaldehyde resins) are mainly adhesives, which release free formaldehyde and other volatile organic compounds (VOCs), which are harmful to the human body and cause environmental pollution; therefore, biomass materials are used to prepare Wood adhesive is an important way to solve environmental and resource problems. [0003] Soybean protein adhesive is a res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J105/00C09J189/00B27N1/02
CPCC09J105/00C09J189/00B27N1/0209C08L89/00C08L5/00
Inventor 张伟王含章赵思齐蔡晴黎文欣
Owner BEIJING FORESTRY UNIVERSITY
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