Vegetable protein adhesive and preparation method, modified adhesive prepared from the vegetable protein adhesive

A plant protein and adhesive technology, which is applied in the field of vegetable protein adhesives and its preparation, can solve the problems of low pH value, low water resistance strength and complicated preparation process of vegetable protein adhesives, and achieve easy control of finished product quality, high water resistance bonding strength, The effect of solving formaldehyde pollution

Active Publication Date: 2011-12-07
山东千森木业集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's wood adhesives are mainly urea-formaldehyde resins, phenolic resins and melamine resins, and the amount of use reaches more than 90%. The use of the above-mentioned trialdehyde glues has the following problems: (1) in the production of adhesives, wood-based panels and their products (furniture, wooden floor, indoor Wooden decoration materials, etc.) will continuously release formaldehyde during use, causing air pollution in production workshops and living rooms, and seriously threatening people's physical and mental health; (2) phenolic adhesives and their wood-based panel products have the problem of phenol volatilization, resulting in waste of raw materials, Increased production costs; (3) Trialdehyde adhesive raw materials are heavily dependent on fossil resources and are non-renewable; (4) Trialdehyde adhesives cannot be degraded and pollute the environment
The pH value of the vegetable protein adhesive denatured by acidic reagent is low, and the bonding strength of the prepared plywood is low, and the water resistance strength is low, which cannot meet the requirements of type II plywood
[0008] In order to solve the defect of poor water resistance of acid-modified vegetable protein adhesives, the study uses acid-base combination to modify vegetable proteins to prepare modified adhesives. However, due to the many components of adhesives, the preparation process is complicated. The invention with the publication number CN101402843 The patent application discloses a vegetable protein adhesive modified jointly with metal ions and active substances and a preparation method thereof. The raw materials are: vegetable protein powder, water, acid, metal ions, active substances, and alkali; the preparation process is as follows: Mix plant protein powder and water evenly, add acid at a certain temperature, then add metal ions to react for a period of time, then add active substances to react for a period of time, finally add alkali, and react for a period of time to complete; the invention patent with the publication number CN101319131 The application discloses a formaldehyde-free and environment-friendly vegetable protein modified adhesive. The modified adhesive includes the following formula in parts by weight: 30-50 parts of natural vegetable meal; 5-12 parts of alkaline materials; 5-10 parts of calcium hydroxide milk; Urea 6-15; Alkyl sodium sulfate 4-10; 10-20% inorganic acid 2-5; Deionized water 90-120; Publication No. CN1948416 invention patent application discloses a vegetable raw material rich in protein A new process for preparing a formaldehyde-free wood adhesive, the process steps are: (1) dissolving the protein in the vegetable raw material, and then mechanically mixing it with the powder; (2) homogenizing the mixture with a colloid mill; ( 3) adding auxiliary agents for comprehensive conditioning; (4) homogenizing the protein to obtain the final product
However, the preparation process of the above-mentioned vegetable protein modified adhesive is too long, and the investment in equipment is large, and the bonding strength is low, which can only meet the requirements of type II plywood.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] 1. Prepare raw materials (Kg) according to the following weight ratio:

[0061] water 100

[0062] Urea 8

[0063] Defatted soy flour 20

[0064] Among them, the protein content in the defatted soy flour is 42%;

[0065] 2. Add all the defatted soy flour and urea into a reaction kettle filled with water, stir and mix evenly to obtain a vegetable protein solution;

[0066] 3. Add pH alkalinity regulator sodium hydroxide solution into the reaction kettle, stir the vegetable protein solution while adding, adjust the pH value of the vegetable protein solution, after the pH value is 10.0, heat up to 50°C, at 50°C , stirred and reacted for 60 minutes to obtain an alkali-modified vegetable protein solution, wherein the mass percentage concentration of the sodium hydroxide solution was 20%;

[0067] 4. At a temperature of 50°C, add pH acidic regulator citric acid to the alkali-modified vegetable protein solution, stir while adding, adjust the pH value of the vegetable prote...

Embodiment 2

[0070] 1. Prepare raw materials (Kg) according to the following weight ratio:

[0071] water 100

[0072] Defatted Maple Protein Powder 50

[0073] Among them, the protein content in defatted maple protein powder is 48%;

[0074] 2. Add all the defatted maple protein powder into a reaction kettle filled with water, stir and mix evenly to obtain a vegetable protein solution;

[0075] 3. Add the concentrated ammonia solution of pH alkaline regulator into the reaction kettle, stir while adding, adjust the pH value of the vegetable protein solution to 8.0, then stir and react for 180 minutes at room temperature 20°C to obtain alkali Modified vegetable protein solution, wherein the mass percent concentration of concentrated ammonia water is 20%;

[0076] 4. At a temperature of 20°C, add pH acidic regulator oxalic acid to the alkali-modified vegetable protein solution, stir while adding, adjust the pH value of the vegetable protein solution to make the pH value 6.0, and stir for ...

Embodiment 3

[0079] 1. Prepare raw materials (Kg) according to the following weight ratio:

[0080] water 100

[0081] Urea 12

[0082] Defatted Peanut Protein Powder 40

[0083] Wherein, the protein content in defatted peanut protein powder is 40%;

[0084] 2. Add all the defatted peanut protein powder and urea into a reaction kettle filled with water, stir and mix evenly to obtain a vegetable protein solution;

[0085] 3. Add sodium carbonate, a pH alkaline regulator, into the reaction kettle, and stir the vegetable protein solution while adding, to adjust the pH value of the vegetable protein solution to 11.0, then heat up to 60°C, and stir at 60°C React for 90 minutes to obtain an alkali-modified vegetable protein solution;

[0086] 4. At a temperature of 60°C, add hydrochloric acid, a pH acid regulator, to the alkali-modified vegetable protein solution, and stir while adding, to adjust the pH value of the vegetable protein solution so that the pH value is 3.0, and stir for 90 minu...

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Abstract

The invention discloses a vegetable protein adhesive, a preparation method thereof and a modified adhesive composed of the vegetable protein adhesive and a crosslinking agent. The preparation method of the vegetable protein adhesive includes carrying out acid modification treatment on the vegetable protein under acidic conditions and alkali modification treatment under alkaline conditions. The vegetable protein adhesive of the present invention is formed by compound denaturation of vegetable protein with acid and alkali multiple times, and the plywood prepared by the vegetable protein adhesive prepared by the present invention has high water-resistant bonding strength and meets the requirements of class II plywood; adding appropriate crosslinking The prepared modified vegetable protein adhesive can also meet the requirements of type I plywood, and the prepared wood-based panel has almost no formaldehyde release.

Description

technical field [0001] The invention relates to a protein-based adhesive and a preparation method thereof, in particular to a vegetable protein adhesive and a preparation method thereof. Background technique [0002] my country is the world's largest producer and consumer of wood-based panels and wood adhesives, consuming more than 5 million tons of adhesives (based on 100% solid content). my country's wood adhesives are mainly urea-formaldehyde resins, phenolic resins and melamine resins, and the amount of use reaches more than 90%. The use of the above-mentioned trialdehyde glues has the following problems: (1) in the production of adhesives, wood-based panels and their products (furniture, wooden floor, indoor Wooden decoration materials, etc.) will continuously release formaldehyde during use, causing air pollution in production workshops and living rooms, and seriously threatening people's physical and mental health; (2) phenolic adhesives and their wood-based panel prod...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): C09J11/06C09J189/00
Inventor张世锋李建章高强周文瑞桑子涛
Owner山东千森木业集团有限公司