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Adhesive for corn straw scrimber and preparation method of adhesive

A technology of corn stalks and recombined materials, which is applied in adhesives, applications, household components, etc., can solve the problems of high organic volatile matter release and formaldehyde release, and achieve improved comprehensive performance, improved bonding performance, and excellent water and weather resistance. Effect

Inactive Publication Date: 2020-07-10
BEIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN201810076912.5 discloses a method for preparing corn straw composite wood-based panels. The styrene-butadiene latex adhesive used in this patent avoids the use of formaldehyde as a raw material and has the advantage of low formaldehyde release. However, other components such as acetone in the adhesive There are problems such as high emission of organic volatiles, and the bonding strength needs to be further improved
Patent CN201710827096.2 discloses a production method of lightweight particleboard. The patent uses melamine and isocyanate as adhesives. The bonding strength is good, but there is a problem of high formaldehyde emission

Method used

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  • Adhesive for corn straw scrimber and preparation method of adhesive
  • Adhesive for corn straw scrimber and preparation method of adhesive
  • Adhesive for corn straw scrimber and preparation method of adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of the adhesive for corn straw recombined wood is as follows:

[0025] The adhesive described in A first mixes 376 parts of formaldehyde aqueous solution with a mass concentration of 37.4%, 198 parts of phenol, 180 parts of water and the first batch of 4 parts of 45wt% sodium hydroxide aqueous solution, and heats up to 90-95° C. for 2 hours after mixing;

[0026] B lowered the temperature to 75°C and added 67 parts of the second batch of 45wt% sodium hydroxide aqueous solution, and raised the temperature to 85°C for 1.5 hours;

[0027] C After the reaction is completed, the temperature is lowered to 67°C, and the third batch of 66 parts of 45wt% sodium hydroxide aqueous solution and 18 parts of resorcinol are added, and after 10 minutes of reaction, the temperature is lowered to 40°C and the material is discharged to obtain a new type of adhesive for corn stalks. .

[0028] The surface of the decomposed corn stalks was sprayed with glue, the amou...

Embodiment 2

[0030] The preparation method of the adhesive for corn straw recombined wood is as follows:

[0031] The adhesive described in A first mixes 395 parts of formaldehyde aqueous solution with a mass concentration of 36.5%, 200 parts of phenol, 190 parts of water, and the first batch of 7 parts of 45% potassium hydroxide aqueous solution, and heats up to 90-95° C. for 2 hours after mixing;

[0032] B lowered the temperature to 75°C and added 69 parts of the second batch of 45% potassium hydroxide aqueous solution, and raised the temperature to 85°C for 1.5 hours;

[0033] C After the reaction, cool down to 67°C and add the third batch of 68 parts of 45% potassium hydroxide aqueous solution and 19 parts of resorcinol. After reacting for 10 minutes, cool down to 40°C and discharge to obtain a new adhesive for corn straw recombination.

[0034] The surface of the decomposed corn stalks was sprayed with glue, the amount of glue applied was 13% of the mass of the corn stalks. After for...

Embodiment 3

[0036] The preparation method of the adhesive for corn straw recombined wood is as follows:

[0037] For the adhesive described in A, 400 parts of formaldehyde aqueous solution with a mass concentration of 37.2%, 210 parts of phenol, 200 parts of water and 8 parts of the first batch of 45% potassium hydroxide aqueous solution were first heated to 90-95° C. for 2 hours;

[0038] B lowered the temperature to 75°C and added 70 parts of the second batch of 45% potassium hydroxide aqueous solution, and raised the temperature to 85°C for 1.5 hours;

[0039] C After the reaction, cool down to 67°C and add the third batch of 68 parts of 45% potassium hydroxide aqueous solution and 21 parts of resorcinol. After reacting for 10 minutes, cool down to 40°C and discharge to obtain a new type of adhesive for corn stalks.

[0040] The surface of the decomposed corn stalks was sprayed with glue, the amount of glue applied was 13% of the mass of the corn stalks. After forming the billet, the c...

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Abstract

The invention relates to the technical field of adhesive preparation, in particular to an adhesive for corn straw scrimber and a preparation method of the adhesive. According to the adhesive disclosedby the invention, the resorcinol is added; the characteristics of excellent water resistance and weather resistance and low-temperature curing of the resorcinol resin are exerted; the raw materials are fully cured in the hot pressing process, so that the bonding performance of the corn straw scrimber is obviously improved, the problems of phenol and formaldehyde pollution of a traditional phenolic resin adhesive and organic volatile matter release during sizing of an isocyanate adhesive are reduced, and the comprehensive performance of the corn straw scrimber is greatly improved.

Description

technical field [0001] The invention relates to the technical field of adhesive preparation, in particular to an adhesive for corn stalk recombined wood and a preparation method thereof. Background technique [0002] In the case of increasingly tight timber resources and insufficient supply of wood-based panel raw materials, using crop straw, a renewable resource, to produce wood-based panels can not only alleviate the problem of insufficient supply of wood-based panel raw materials, but also increase farmers' income, reduce straw burning, Improving the ecology has great practical significance. The surface of corn stalks contains waxy substances different from rice straw, wheat straw and other crop stalks, which have extremely poor wettability. It is difficult to glue them together well by relying on traditional urea-formaldehyde or phenolic resin glue, and even has a very strong effect on wheat (rice) straw. Isocyanate (MDI) with good gluing performance cannot glue corn st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/12C09J161/06C08G8/24C08G8/22C08G8/10B27N3/00B27N3/08
CPCB27N3/002B27N3/08C08G8/10C08G8/22C08G8/24C09J161/06C09J161/12
Inventor 时君友徐文彪李翔宇
Owner BEIHUA UNIV
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