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Method for preparing silicate nano-clay/urea resin composite adhesive

A composite adhesive and silicate clay technology, applied in adhesives, adhesive types, non-polymer adhesive additives, etc., can solve the problems of reducing the bonding strength of urea-formaldehyde resin, complicated pre-treatment, and prolonged production cycle, etc., to achieve Improve dispersibility and reactivity, reduce free formaldehyde content, and enhance surface activity

Active Publication Date: 2010-09-01
溧阳常大技术转移中心有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantages of this method are: ①The additive has a large particle size, and the addition of the additive to the urea-formaldehyde resin cannot reflect the reinforcing performance and adsorption of the attapulgite. Poor; 2. There are many ingredients in the ingredients, and the main function is still the organic modifier, which increases the production cost; 3. There are many processes for preparing the active attapulgite clay, the pretreatment is complicated, and the production cycle is prolonged, which is not conducive to industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. Thermally activate 50 kg of kaolin at 400°C for 1 hour, immediately add 167 kg of sulfuric acid solution with a mass percent concentration of 15% for quenching, mechanically stir for 5 hours, and let stand for 2 days to remove the lower layer of impurities , to prepare nano-kaolin acidic dispersion;

[0028] 2. While stirring, add a sodium silicate solution with a mass percent concentration of 20% to the acid dispersion of nano-kaolin until the pH of the system is 2, filter, and wash until the conductivity of the filtrate is 300 μS / cm to prepare nano-kaolin / Silica composite filter cake;

[0029] 3. Add deionized water to the nano-kaolin / silicon oxide composite filter cake obtained in step 2, mechanically stir, and be mixed with a nano-kaolin / silicon oxide composite slurry, wherein the quality of the nano-kaolin / silicon oxide composite and deionized water The ratio is 0.1, weigh 110 kg of this slurry, adjust the pH value to 10 with a sodium silicate solution with a...

Embodiment 2

[0032] 1. Thermally activate 50 kg of sepiolite clay at 300°C for 10 hours, immediately add it to 500 kg of hydrochloric acid solution with a concentration of 5% by mass for quenching, ultrasonically disperse it for 1 hour, and let it stand for 6 days. Impurities are precipitated and removed to prepare nano sepiolite acidic dispersion;

[0033] 2. While stirring, add a potassium silicate solution with a mass percent concentration of 10% to the acidic dispersion of the nano sepiolite until the pH of the system is 2.7, filter, and wash until the conductivity of the filtrate is 200 μS / cm to obtain a nanometer sepiolite. Sepiolite / silica composite filter cake;

[0034] 3. Add deionized water to the nano-sepiolite / silicon oxide composite filter cake obtained in step 2, stir mechanically, and prepare a nano-sepiolite / silicon oxide composite slurry, wherein the nano-sepiolite / silicon oxide composite The mass ratio to deionized water is 0.25, weigh 50 kg of this slurry, adjust the pH...

Embodiment 3

[0037] 1. Thermally activate 50 kg of montmorillonite clay at 370°C for 2 hours, immediately add 333 kg of 8% nitric acid solution to quench, mechanically stir for 4 hours, let stand for 3 days, put the lower layer Impurities are precipitated and removed to obtain an acidic dispersion of nano-montmorillonite;

[0038] 2. While stirring, add a sodium silicate solution with a mass percent concentration of 17% to the nano-montmorillonite acidic dispersion until the pH of the system is 3, filter, wash until the conductivity of the filtrate is 275 μS / cm, and obtain Nano-montmorillonite / silica composite filter cake;

[0039] 3. Add deionized water to the nano-montmorillonite / silicon oxide composite filter cake obtained in step 2, stir mechanically, and prepare a nano-montmorillonite / silicon oxide composite slurry, wherein the nano-montmorillonite / silicon oxide composite The mass ratio to deionized water is 0.15, weigh 115 kg of this slurry, adjust the pH value to 9.5 with a sodium ...

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Abstract

The invention provides a method for preparing a silicate nano-clay / urea resin composite adhesive, and belongs to the field of deep processing of non-metallic mine and high polymer materials. The technical scheme of the method comprises the following steps of: first, performing surface activating treatment on the silicate clay; then, inorganically and organically modifying the nano-clay by using soluble silicate solution and a silane coupling agent respectively; and finally, adding the modified nano-clay in a process of synthesizing the urea resin so as to prepare the silicate nano-clay / urea resin composite adhesive. The raw materials of the composite adhesive have rich sources and low price; and the method has a simple process, can effectively reduce the free formaldehyde content of the urea resin, and simultaneously improve the mechanical performance of the urea resin.

Description

technical field [0001] The invention relates to the surface modification of silicate nano-clay and its application in urea-formaldehyde resin adhesive, which belongs to the field of deep processing of non-metallic minerals and polymer materials, and the product is suitable for wood processing industry. Background technique [0002] Urea-formaldehyde resin adhesives are widely used in plywood, blockboard and other wood-based panel industries due to their low cost and high bonding strength. However, the outstanding disadvantage of urea-formaldehyde resin adhesives is the high content of free formaldehyde, and its products will slowly release formaldehyde during use. long-term pollution of the environment. At present, there are two commonly used methods to reduce the content of free formaldehyde in urea-formaldehyde resins. One is to reduce the mass ratio of formaldehyde to urea in the reactants when synthesizing urea-formaldehyde resins. However, this method will lead to negat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/24C09J11/04C09C1/28C09C3/04C09C3/06C09C3/12
Inventor 姚超左士祥汪信杜郢陈志刚吴凤芹魏科年
Owner 溧阳常大技术转移中心有限公司
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