Modified cake protein-based adhesive as well as preparation method and application thereof

Abstract

The invention relates to the technical field of adhesives, and provides a modified cake protein-based adhesive and a preparation method and application thereof.The modified cake protein-based adhesive is prepared from cake protein, water, adipic dihydrazide, diacetone acrylamide, m-xylylene dimethyl isocyanate and filler, and the filler is starch or inorganic clay. The modified cake meal protein-based adhesive provided by the invention is high in mechanical strength, good in water resistance, high in universality and suitable for large-scale application.

Description

Technical Field

[0001] The present invention relates to the technical field of adhesives, and particularly to a modified rapeseed meal protein-based adhesive. Background Art

[0002] In the prior art, traditional synthetic adhesives release formaldehyde and harmful VOCs, which are seriously harmful to the human body. Ordinary soybean protein-based adhesives have the disadvantages of poor water resistance and low mechanical strength, and are difficult to be industrially applied. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a modified rapeseed meal protein-based adhesive with high mechanical strength and good water resistance, and to provide a preparation method and application of the adhesive.

[0004] To solve the above technical problem, the technical solution of the present invention regarding the adhesive is: a modified rapeseed meal protein-based adhesive, which is prepared from the following raw materials: rapeseed meal protein, water, adipic dihydrazide, diacetone acrylamide, isophthalic diisocyanate, and a filler, wherein the filler is starch or inorganic clay.

[0005] Preferably, the weight parts of each raw material component are: 10-20 parts of rapeseed meal protein, 40-50 parts of water, 40 parts of adipic dihydrazide, 5-10 parts of diacetone acrylamide, 5-10 parts of isophthalic diisocyanate, and 1-3 parts of the filler.

[0006] In one embodiment, the weight parts of each raw material component are: 20 parts of rapeseed meal protein, 40 parts of water, 40 parts of adipic dihydrazide, 5 parts of diacetone acrylamide, 10 parts of isophthalic diisocyanate, and 2 parts of the filler.

[0007] In one embodiment, the weight parts of each raw material component are: 10 parts of rapeseed meal protein, 50 parts of water, 40 parts of adipic dihydrazide, 5 parts of diacetone acrylamide, 10 parts of isophthalic diisocyanate, and 2 parts of the filler.

[0008] In one embodiment, the weight parts of each raw material component are: 20 parts of rapeseed meal protein, 40 parts of water, 40 parts of adipic dihydrazide, 10 parts of diacetone acrylamide, 5 parts of isophthalic diisocyanate, and 2 parts of the filler.

[0009] The preparation method of the modified rapeseed meal protein-based adhesive of the present invention includes the following steps: S1 Mix the corresponding proportions of rapeseed meal protein, water, and adipic dihydrazide, stir evenly, and then react for 3-5 h under reflux, nitrogen protection, and at 80-100 °C; S2 Add corresponding proportions of diacetone acrylamide and isophthalic diisocyanate, and react under reflux, nitrogen protection and at 40 - 50 °C for 20 - 30 h. After stopping the reaction, cool to obtain highly reactive rapeseed meal protein; S3 Add the highly reactive rapeseed meal protein to the filler and mix until uniform to obtain the modified rapeseed meal protein-based adhesive.

[0010] The modified rapeseed meal protein-based adhesive prepared by the above technical solution can be applied to plywood.

[0011] The beneficial effects of the present invention are as follows: ① The raw materials and preparation method of the modified rapeseed meal protein-based adhesive provided by the present invention are simple, and there is no release of formaldehyde and harmful VOCs; ② After testing, the modified rapeseed meal protein-based adhesive provided by the present invention has high mechanical strength, good water resistance and strong versatility, and is suitable for large-scale application. Specific embodiments

[0012] In order to make the purpose, technical solution and advantages of the invention clearer, the present invention will be described in detail below with reference to specific embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention and are not limited to the present invention. Example 1

[0013] A modified rapeseed meal protein-based adhesive is prepared from the following raw materials in parts by weight: 20 parts of rapeseed meal protein, 40 parts of water, 40 parts of adipic dihydrazide, 5 parts of diacetone acrylamide, 10 parts of isophthalic diisocyanate, and 2 parts of filler. The rapeseed meal protein can be tung tree rapeseed meal protein, camellia oleifera rapeseed meal protein, soybean rapeseed meal protein or litsea cubeba rapeseed meal protein, and the filler is starch or inorganic clay.

[0014] The preparation method of the above modified rapeseed meal protein-based adhesive includes the following steps: S1 Mix corresponding proportions of rapeseed meal protein, water and adipic dihydrazide and stir evenly, then react under reflux, nitrogen protection and at 80 - 100 °C for 3 - 5 h; S2 Add corresponding proportions of diacetone acrylamide and isophthalic diisocyanate, and react under reflux, nitrogen protection and at 40 - 50 °C for 20 - 30 h. After stopping the reaction, cool to obtain highly reactive rapeseed meal protein; S3 Add the highly reactive rapeseed meal protein to the filler and mix until uniform to obtain the modified rapeseed meal protein-based adhesive. Example 2

[0015] A modified cake meal protein-based adhesive is prepared from the following raw materials in parts by weight: 10 parts of cake meal protein, 50 parts of water, 40 parts of adipic dihydrazide, 5 parts of diacetone acrylamide, 10 parts of isophthalic dimethyl diisocyanate, and 2 parts of filler. The cake meal protein can be tung cake meal protein, camellia cake meal protein, soybean cake meal protein, or litsea cubeba cake meal protein, and the filler is starch or inorganic clay.

[0016] The preparation method of the above-mentioned modified cake meal protein-based adhesive is the same as that of Example 1. Example 3

[0017] A modified cake meal protein-based adhesive is prepared from the following raw materials in parts by weight: 20 parts of cake meal protein, 40 parts of water, 40 parts of adipic dihydrazide, 10 parts of diacetone acrylamide, 5 parts of isophthalic dimethyl diisocyanate, and 2 parts of filler. The cake meal protein can be tung cake meal protein, camellia cake meal protein, soybean cake meal protein, or litsea cubeba cake meal protein, and the filler is starch or inorganic clay.

[0018] The preparation method of the above-mentioned modified cake meal protein-based adhesive is the same as that of Example 1. Comparative Example 1

[0019] The adhesive provided in this comparative example does not contain adipic dihydrazide in its raw materials, and the rest is the same as in Example 1. Comparative Example 2

[0020] The adhesive provided in this comparative example does not contain diacetone acrylamide in its raw materials, and the other is the same as in Example 1. Comparative Example 3

[0021] The adhesive provided in this comparative example does not contain isophthalic dimethyl diisocyanate in its raw materials, and the rest is the same as in Example 1.

[0022] The adhesives of Examples 1 to 3 and Comparative Examples 1 to 3 are respectively applied to plywood, and their performances are respectively tested. The test results are shown in Table 1: Table 1 Performance test of Eucalyptus three-layer plywood Gluing strength (GB / T 17657-2022, dry state) / MPa Gluing strength (GB / T 17657-2022, type I boiling water treatment) / MPa Example 1 3.21 2.14 Example 2 2.72 1.97 Example 3 2.55 1.88 Comparative Example 1 0.61 —— Comparative Example 2 0.52 —— Comparative Example 3 0.64 —— It can be seen from the test results in Table 1 that the adhesives of Examples 1 to 3 are much better than the adhesives of Comparative Examples 1 to 3 in both bonding strength and water resistance.

[0023] The above embodiments are the preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious substitution without departing from the concept of the technical solution is within the scope of the present invention patent.

[0024] To enable those of ordinary skill in the art to more easily understand the improvements of the present invention over the prior art, some descriptions of the present invention have been simplified, and for the sake of clarity, some other elements have also been omitted from this application document. Those of ordinary skill in the art should be aware that these omitted elements may also constitute the content of the present invention.

Claims

1. A modified rapeseed meal protein-based adhesive, characterized in that, The adhesive is prepared from the following raw materials: cake meal protein, water, adipic dihydrazide, diacetone acrylamide, isophthalic diisocyanate and filler, and the filler is starch or inorganic clay.

2. The modified cake meal protein-based adhesive according to claim 1, wherein The weight parts of each raw material component are: 10-20 parts of cake meal protein, 40-50 parts of water, 40 parts of adipic dihydrazide, 5-10 parts of diacetone acrylamide, 5-10 parts of isophthalic diisocyanate, and 1-3 parts of filler.

3. The modified rapeseed protein-based adhesive according to claim 2, wherein The weight parts of each raw material component are: 20 parts of cake meal protein, 40 parts of water, 40 parts of adipic dihydrazide, 5 parts of diacetone acrylamide, 10 parts of isophthalic diisocyanate, and 2 parts of filler.

4. The modified rapeseed protein-based adhesive according to claim 2, wherein The weight parts of each raw material component are: 10 parts of cake meal protein, 50 parts of water, 40 parts of adipic dihydrazide, 5 parts of diacetone acrylamide, 10 parts of isophthalic diisocyanate, and 2 parts of filler.

5. The modified rapeseed meal protein-based adhesive according to claim 2, characterized in that, The weight parts of each raw material component are: 20 parts of cake meal protein, 40 parts of water, 40 parts of adipic dihydrazide, 10 parts of diacetone acrylamide, 5 parts of isophthalic diisocyanate, and 2 parts of filler.

6. A preparation method of the modified rapeseed meal protein-based adhesive according to any one of claims 1 to 5, characterized in that, It includes the following steps: S1 Blend the corresponding proportions of cake meal protein, water and adipic dihydrazide, and stir evenly, then react under reflux, nitrogen protection and at 80-100 °C for 3-5 h; S2 Add the corresponding proportions of diacetone acrylamide and isophthalic diisocyanate, react under reflux, nitrogen protection and at 40-50 °C for 20-30 h, stop the reaction, and cool to obtain highly reactive cake meal protein; S3 Add the highly reactive cake meal protein to the mixture of starch and filler, and stir until uniform to obtain the modified cake meal protein-based adhesive.

7. Application of the modified cake meal protein-based adhesive according to any one of claims 1 to 5 in wood-based panels.