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Flame retardant modified lignin resin glue and preparing method thereof

A kind of lignin glue, flame retardant technology, applied in the direction of adhesives, adhesive types, aldehyde/ketone condensation polymer adhesives, etc. and the effect of low free formaldehyde content and high adhesive strength

Inactive Publication Date: 2010-12-29
安吉仕强制胶有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the flame retardant effect of this modified lignin glue is general

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A flame-retardant modified lignin glue, which is prepared from the following components: 20wt% formaldehyde solution with a concentration of 30%, 8wt% phenol, and the balance is papermaking with herbal lignin as the main active substance waste liquid. Lignin is a kind of substance composed of polymerized aromatic compounds. It naturally exists in plant tissues and is structurally located between cellulose fibers and hemicellulose. Its main function is to harden the cell wall by forming an interwoven network. It has similar properties to phenol Structure. The content of herbaceous lignin in papermaking waste liquid is above 5wt%. Papermaking waste liquid contains non-combustible non-metals such as Si and their oxides.

[0033] A preparation method for flame-retardant modified lignin glue, comprising the following steps in sequence:

[0034] ①. Heat and melt the phenol containing trifunctionality in advance, pump it into the reaction pot with a vacuum pump, then pump a...

Embodiment 2

[0040] A flame-retardant modified lignin glue, which is prepared from the following components: 30wt% formaldehyde solution with a concentration of 50%, 12wt% phenol, and the balance is papermaking with herbal lignin as the main active substance waste liquid. Lignin is a class of substances composed of polymerized aromatic alcohols. It naturally exists in plant tissues and is located between cellulose fibers. Its main function is to harden the cell wall by forming an interwoven network. It has a structure similar to phenol. The content of herbaceous lignin in papermaking waste liquid is above 20wt%. Papermaking waste liquid contains non-combustible non-metals such as Si and their oxides.

[0041] A preparation method for flame-retardant modified lignin glue, comprising the following steps in sequence:

[0042] ①. Heat and melt the phenol containing trifunctionality in advance, pump it into the reaction pot with a vacuum pump, then pump a sodium hydroxide solution with a pH v...

Embodiment 3

[0048] Flame retardant test: In this test, crushed mulberry wood is used as a raw material for recombined solid wood. The viscose prepared in Example 2 of the present invention is used to artificially synthesize recombined solid wood to measure its flame retardant effect.

[0049] Test based on: ASTM E84-08 Test method for surface burning characteristics of building materials

[0050] time (min)

[0051] Flame Spread Index = 17.5 Smoke Growth Index = 300.

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PUM

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Abstract

The invention relates to a wood adhesive and a preparing method thereof, particularly to a flame-retardant modified lignin resin glue and a preparing method thereof. The flame retardant modified lignin resin glue is prepared by the following components in percent by weight: 20-30 percents of formaldehyde solution with concentration of 30-50 percents, 8-12 percents of phenolic compounds with three functionality epoxide resin, and the paper-making waste liquor with herbal lignin as the major active substance. The invention has the advantages of flame resistance and high adhesive strength. The content of free naphthol and free formaldehyde of the invention is low, so that the invention is environmentally-friendly. The invention makes use of paper-making waste liquor, thus the invention can not only protect environment, but also lower production cost greatly.

Description

technical field [0001] The invention relates to a wood adhesive and a preparation method thereof, in particular to a flame-retardant modified lignin glue and a preparation method thereof. Background technique [0002] At present, the most commonly used wood adhesive is phenolic resin. The advantages and disadvantages of phenolic resin are obvious. The advantages are high bonding strength, strong moisture and heat resistance; the disadvantages are dark color, brittle nature, slow curing speed, and general flame retardant effect. The glue contains a small amount of free formaldehyde and free phenol, which is not good for human health. Lignin is a class of substances composed of polymerized aromatic compounds, naturally present in plant tissues, structurally located between cellulose fibers and hemicellulose, and its main function is to harden the cell wall by forming an interwoven network. It has similar chemical properties to phenol, so it can react with phenol and formaldeh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/14C09J197/00
Inventor 姚兆广胡军卫
Owner 安吉仕强制胶有限公司
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