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Preparation method of formaldehyde-free water-resistant protein adhesive

An adhesive and water-resistant technology, used in the preparation of protein adhesives, animal glue or gelatin, and adhesives, etc., can solve the problems of complex hot pressing process, high cost, poor water resistance, etc., and achieve excellent market prospects, low cost, The effect of increasing the crosslinking density

Inactive Publication Date: 2014-07-23
QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing a formaldehyde-free water-resistant protein adhesive, which solves the problems of poor water resistance, high cost and complicated hot-pressing process of the existing protein adhesive

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Activation of protein raw materials:

[0032] Add 80g of defatted peanut meal and 80g of absolute ethanol into the reactor, stir for 20min, add 0.8g of alkaline solution, raise the temperature to 80°C, and react for 1h; cool down to room temperature, add 0.8g of sodium sulfite, and react for 1h; adjust to neutral, Pour the reaction solution into an open container, evaporate to dryness with absolute ethanol and a small amount of water to obtain activated protein powder, and keep it sealed.

[0033] Preparation of the adhesive:

[0034] Add 50g of water into the reaction kettle, slowly add 100g of activated defatted peanut meal while stirring at room temperature, stir for 60min to make it evenly mixed; add 1g of citric acid, 200g of polyethyleneimine resin, 0.5g of sodium nitrite, and react at 50°C 60min; down to room temperature, the formaldehyde-free protein adhesive is obtained.

Embodiment 2

[0036] Activation of protein raw materials:

[0037] Add 80g of soybean meal and 96g of absolute ethanol into the reactor, stir for 20min, add 2.4g of alkaline solution, raise the temperature to 45°C, and react for 1h; cool down to room temperature, add 2.4g of sodium sulfite, and react for 1h; The reaction solution is poured into an open container, and the activated protein powder is obtained after absolute ethanol and a small amount of water are evaporated, and sealed and stored.

[0038] Preparation of the adhesive:

[0039] Add 200g of water to the reaction kettle, slowly add 80g of activated soybean meal while stirring at room temperature, stir for 60min to make it evenly mixed; add 8g of boric acid, 8g of polyacrylamide, 4g of potassium sorbate, react at 30°C for 60min; cool down to room temperature , that is, a formaldehyde-free protein adhesive.

Embodiment 3

[0041] Activation of protein raw materials:

[0042] Add 80g of soybean meal and 85g of absolute ethanol into the reactor, stir for 20min, add 1.5g of alkaline solution, raise the temperature to 55°C, and react for 1h; cool down to room temperature, add 1.5g of sodium sulfite, and react for 1h; The reaction solution is poured into an open container, and the activated protein powder is obtained after absolute ethanol and a small amount of water are evaporated, and sealed and stored.

[0043] Preparation of the adhesive:

[0044] Add 100g of water in the reaction kettle, slowly add 80g of activated soybean meal while stirring at room temperature, stir for 60min, make it mix evenly; add 4g of oxalic acid, 80g of water-based epoxy-styrene emulsion, 2.4g of benzotriazole, 30 React at ℃ for 60 minutes; cool down to room temperature to obtain a formaldehyde-free protein adhesive.

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Abstract

The invention relates to a preparation method of a formaldehyde-free water-resistant protein adhesive. The main preparation steps are as follows: 1) activating a protein raw material: adding the protein-containing raw material and absolute ethanol, stirring, further adding an alkaline solution, and heating to 45-80 DEG C for reaction; cooling to room temperature and adding a reducing agent; and adjusting to neutral, and evaporating to dryness to obtain activated protein powder; and 2) preparing the protein adhesive: adding the activated protein powder prepared in the step 1, water, an acid-adjusting reagent, an enhancer and a preservative into a reactor, reacting at the temperature of 30-50 DEG C, and reducing to room temperature to obtain the protein adhesive. The preparation method is characterized in that a special protein activation process is adopted to enable proteins to expose active groups thereof and utilize a variety of active functional groups of the proteins to the greater extent; the preparation process of the adhesive is simple and has the advantages of good reproductivity, low cost, no formaldehyde and good water resistance; and a hot pressing process is the same with an existing urea-formaldehyde resin pressure plate process, on the basis of not changing and increasing the hot pressing process and equipment, the production of formaldehyde-free artificial plates can be realized, and the market prospects are greater in comparison with the existing protein adhesive in industrial production.

Description

technical field [0001] The invention relates to a preparation method of a formaldehyde-free bio-based adhesive, in particular to a preparation method of a low-cost, environment-friendly and highly water-resistant protein adhesive. Background technique [0002] Formaldehyde-containing adhesives are the main source of formaldehyde release from wood-based panels. In order to avoid the damage of formaldehyde release from wood-based panels to human health, in recent years, countries have carried out research on the preparation of non-formaldehyde adhesives based on natural renewable biomass materials. Natural renewable biomass that can be used to prepare adhesives includes polysaccharides such as tannin, lignin, protein, starch, and chitosan, among which protein adhesives are the most likely to replace traditional aldehyde adhesives. [0003] The use of protein to prepare adhesives mainly depends on the unique chemical composition and molecular structure of the protein. The vario...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J179/02C09J189/00C09J11/04C09J11/06C09J133/26C09J151/08
Inventor 穆有炳万晓波
Owner QINGDAO INST OF BIOENERGY & BIOPROCESS TECH CHINESE ACADEMY OF SCI
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