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Compound extender for urea-formaldehyde resin

A technology of urea-formaldehyde resin and extender, which is applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesive types, adhesive additives, etc., can solve the problems of decreased bonding strength and weak cross-linking, and improve water resistance Sexuality, high bonding strength, effect of reducing the number

Inactive Publication Date: 2014-02-19
安徽省安邦矿物股份有限公司
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Problems solved by technology

But it has disadvantages: since its main component is starch, the cross-linking with the methylol group in urea-formaldehyde resin is weak, and when the increment rate increases, the bonding strength decreases significantly

Method used

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Embodiment Construction

[0013] A composite extender for urea-formaldehyde resin, which is made by mixing the following raw materials by weight (kg): soybean flour 36, wood flour 24, walnut shell powder 12, corn flour 8, modified attapulgite 25, ammonium chloride 12 , p-toluenesulfonamide 4, sodium desugar lignosulfonate 8.

[0014] The preparation method of described modified attapulgite is as follows:

[0015] (1) Weigh the raw materials with the following weight (kg):

[0016] Attapulgite 30, dolomite 8, plant ash 5, carboxymethyl cellulose 7, isopropyl tris (dioctyl pyrophosphate acyloxy) titanate 1.5, methyl methacrylate 8, butyl acrylate 6, Itaconic acid 4, ammonium persulfate 0.06, sodium bicarbonate 0.08, emulsifier A102 0.25, 1,2-propanediol 1.5, dipropylene glycol butyl ether 4, deionized water 90;

[0017] (2) Mix attapulgite and dolomite, grind and sieve, mix with plant ash, carboxymethyl cellulose, isopropyl tris(dioctyl pyrophosphate acyloxy) titanate at 2000rpm for 25min, take out...

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Abstract

The invention discloses a compound extender for urea-formaldehyde resin, which is prepared by mixing the following raw materials in parts by weight: 30-40 parts of bean flour, 20-30 parts of wood flour, 10-15 parts of walnut shell flour, 5-10 parts of corn flour, 20-30 parts of modified attapulgite, 10-15 parts of ammonium chloride, 3-6 parts of para toluene sulfonate and 5-10 parts of desugared sodium lignosulfonate. According to the invention, the modified attapulgite contains carboxyl, so that condensation crosslinking with hydroxymethyl of urea-formaldehyde resin is greatly improved, and the dispersion property in the urea-formaldehyde resin is good, thereby reducing the number of hydrophilic groups and improving the water resistance of adhesion. The extender disclosed by the invention is convenient in adhesive mixing method, can reduce or replace extenders such as flour and the like for use and lower the cost, and has high adhesion strength, good shock strength and large elastic modulus. Through chemical bond combination and adsorption of the modified attapulgite, release of free formaldehyde is reduced.

Description

technical field [0001] The invention relates to a composite extender for urea-formaldehyde resin, which belongs to the field of adhesive additives. Background technique [0002] During the use of urea-formaldehyde resin, in order to reduce the cost of the rubber material, improve the quality of the glue, and meet the process requirements, it is generally necessary to add an appropriate amount of extender. The use of extenders can not only save the amount of glue used, but also avoid glue penetration, reduce the internal stress caused by the shrinkage of the glue layer during the curing process of the glue, thereby prolonging the service life of the plywood. Therefore, while reducing the cost of urea-formaldehyde resin glue, It also brings certain social benefits. Due to the advantages of wide sources, convenient use, and low price, most plywood enterprises in my country use ordinary flour as an extender. However, it has disadvantages: since its main component is starch, th...

Claims

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Application Information

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IPC IPC(8): C09J11/08C09J11/04C09J11/06C09J161/24
Inventor 吴士文
Owner 安徽省安邦矿物股份有限公司
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