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Novel non-formaldehyde wood adhesive and preparation thereof

A wood adhesive and adhesive technology, which is applied in the preparation of adhesives, animal glue or gelatin, and protein adhesives, etc., can solve the problems of high price and difficult coating of protein glue.

Active Publication Date: 2009-04-22
宁波朝露新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Melamine-formaldehyde glue has excellent water resistance and heat resistance, but its price is more expensive
The protein glue is also not easy to paint

Method used

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  • Novel non-formaldehyde wood adhesive and preparation thereof
  • Novel non-formaldehyde wood adhesive and preparation thereof
  • Novel non-formaldehyde wood adhesive and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Add 15 grams of soy protein isolate and 100 grams of water in an Erlenmeyer flask, then stir for 2 hours until the protein is completely dispersed in the water. The solution is used directly as an adhesive for wood bonding. The dry strength of the adhesive is 3.5MPa, but the wood damage rate is only 10%. According to the national standard GB / T17657-1999, the dry strength test of the adhesive is as follows: the five-layer poplar board is obtained through the processes of gluing, aging, cold pressing, and hot pressing. The cold pressing condition is 1.2MPa, 30 minutes. The hot pressing conditions were 140°C, 1 MPa and 80 sec / mm. The five-layer board was aged at room temperature for 24 hours, and then tested on a universal tensile machine. The wet strength of the five-layer board is obtained by soaking at 63°C for 3 hours, then cooling at room temperature for 10 minutes and immediately testing it on a universal tensile machine.

Embodiment 2

[0070]In an Erlenmeyer flask, add 100 grams of aqueous solutions of 20 grams of soybean powder and 5% sodium hydroxide, then stir for 2 hours until the soybean powder is completely dispersed in water. The mixture is used as an adhesive for wood bonding. The dry strength of the adhesive is 3.0MPa, but the wood damage rate is only 20%.

Embodiment 3

[0072] In an Erlenmeyer flask, add 100 grams of aqueous solutions of 20 grams of soybean powder and 5% sodium hydroxide, then stir for 2 hours until the soybean powder is completely dispersed in water. Add 0.2 g of epichlorohydrin and stir for 1 hour. The mixture is used as an adhesive for wood bonding. The dry strength of the adhesive is 4.2MPa, and the wood damage rate is only 50%.

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Abstract

The invention provides a novel aldehyde-free wood adhesive and a preparation method thereof. A mixture of plant protein and lignin sulphonate is used as a base material, and then high water resisting property is obtained through modifying the protein self. Dry strength of the real aldehyde-free wood adhesive is nearly that of urea-formaldehyde glue and phenol glue, the water resisting property of the aldehyde-free wood adhesive is far higher than that of the urea-formaldehyde glue and approximates to that of the phenol glue, the adhesive fully reaches the usage standard of class II glue, and the adhesive has the advantages of low cost, excellent performance and easy coating.

Description

technical field [0001] This patent relates to a wood adhesive made of vegetable protein, which is chemically denatured and cross-linking agent added to meet the requirement of water resistance. Background technique [0002] At present, adhesives are widely used in the wood processing industry, such as plywood, large core board, medium density fiberboard and particle board. The main wood adhesive on the market is "trialdehyde glue" (urea-formaldehyde glue, phenolic glue, melamine-formaldehyde glue). Urea-formaldehyde glue is used in the largest amount because of its low price and excellent performance. But its water resistance is poor, especially the resistance to boiling water is very poor. Most of this type of plywood will automatically open after two hours in boiling water. Therefore, urea-formaldehyde glue is mainly used in indoor environments that do not require high water resistance and weather resistance. For example for the production of particleboard, fibreboard ...

Claims

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Application Information

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IPC IPC(8): C09J189/00C09J197/00
Inventor 朱锦高玲玲
Owner 宁波朝露新材料科技有限公司
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