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Preparation method and application method of thermosetting water-soluble urea-melamine-formaldehyde terpolymer resin nanopowder adhesive

A technology of formaldehyde ternary copolymerization resin and melamine, which is applied in application, adhesives, and other household appliances, etc., can solve the problems of dry powder grinding and re-dissolving difficulties, changes in physical and chemical properties, and powder surface hardening, etc., to save water evaporation time , Reduce drying energy consumption, and improve the bonding strength

Active Publication Date: 2020-09-08
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This drying method will make the heat-sensitive liquid adhesive continue to polycondense during the heating process, resulting in an increase in molecular weight and changes in physical and chemical properties. At the same time, the surface of the dried powder is hardened, making it difficult to grind and redissolve the dry powder, which in turn affects the bonding. performance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036]Concentrate the thermosetting water-soluble urea-melamine-formaldehyde ternary copolymer resin adhesive under a vacuum of 0.05 MPa. During the concentration, the temperature of the adhesive is controlled at 20°C and concentrated to a solid content of 50%. Adjust the pH with 20% phosphoric acid aqueous solution After reaching a value of 5, freeze-dry under vacuum. The concentrate is pre-frozen at -40°C until completely frozen; the sublimation drying section, the vacuum degree is 0.01mbar, and the freeze-drying temperature is -40°C; the analytical drying section, the vacuum degree is 0.001mbar, and the freeze-drying temperature is -80°C to obtain dry powder. The dry powder is ground at 110° C. by a nano ball mill to a sieve value of 400 nm to obtain a nano powder. The nano-powder is applied in the wood fiber by air blowing, the nano-powder and the wood fiber are mixed evenly by mechanical stirring, the relative moisture content of the wood fiber is 30%, and the application...

Embodiment 2

[0040] Concentrate the thermosetting water-soluble urea-melamine-formaldehyde ternary copolymer resin adhesive under a vacuum of 0.06MPa. When concentrating, the temperature of the adhesive is controlled at 30°C. Concentrate to a solid content of 60%, and adjust the pH with 20% phosphoric acid aqueous solution After the value reached 7, it was freeze-dried in vacuum. The concentrate is pre-frozen at -45°C until it is completely frozen; the sublimation drying section, the vacuum degree is 0.02mbar, and the freeze-drying temperature is -45°C; the analytical drying section, the vacuum degree is 0.002mbar, and the freeze-drying temperature is -70°C to obtain dry powder. The dry powder is ground by a nano ball mill at 250° C. until the sieve value is 900 nm to obtain a nano powder. The nano-powder is applied in the wood fiber by air blowing, the nano-powder and the wood fiber are mixed evenly by mechanical stirring, the relative moisture content of the wood fiber is 100%, and the a...

Embodiment 3

[0044] Concentrate the thermosetting water-soluble urea-melamine-formaldehyde ternary copolymer resin adhesive under a vacuum of 0.07MPa. When concentrating, the temperature of the adhesive is controlled at 40°C, concentrated to a solid content of 70%, and adjusted with 20% ammonium sulfate aqueous solution After the pH value reached 5.5, it was vacuum freeze-dried. The concentrate is pre-frozen at -50°C until it is completely frozen; the sublimation drying section, the vacuum degree is 0.03mbar, and the freeze-drying temperature is -50°C; the analytical drying section, the vacuum degree is 0.003mbar, and the freeze-drying temperature is -60°C to obtain dry powder. The dry powder is ground by a nano ball mill at 150° C. until the sieve value is 700 nm to obtain a nano powder. The nano-powder is applied in the wood shavings by air blowing. The nano-powder and the wood shavings are mixed evenly by mechanical stirring. The relative moisture content of the wood shavings is 30%. ....

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Abstract

The invention provides a preparation method of a thermosetting water-soluble urea-melamine-formaldehyde ternary polymerization resin nano powder adhesive. The preparation method comprises the following steps: step 1, performing vacuum concentration on the thermosetting water-soluble urea-melamine-formaldehyde ternary polymerization resin adhesive; step 2, performing pH value adjustment on the thermosetting water-soluble urea-melamine-formaldehyde ternary polymerization resin adhesive after concentration; step 3, performing vacuum freeze drying on the thermosetting water-soluble urea-melamine-formaldehyde ternary polymerization resin adhesive after pH value adjustment in the step 2; and step 4, performing grinding and sieving after vacuum freeze drying. The adhesive prepared by adopting themethod is applied to an artificial board substrate with high moisture content in a dry adhesive applying mode, and a respiratory thermal pre-pressing process is adopted to produce an artificial board, so that the energy consumption for drying the artificial board substrate can be reduced, the curing speed of the adhesive can be increased, the adhesion strength and the water resistance of the artificial board can be improved, and the formaldehyde release amount can be reduced.

Description

technical field [0001] The invention relates to a preparation method and an application method of a thermosetting water-soluble urea-melamine-formaldehyde terpolymer resin nano powder adhesive, belonging to the field of wood-based panel manufacturing. Background technique [0002] In 2015, the output of wood-based panels in my country reached 287 million m 3 , accounts for 60% of the world's wood-based panel production, and consumes 15.3 million tons of adhesives. The consumption is still growing at a rate of about 10% with the increase in wood-based panel production. The consumption of amine-based resin adhesives, including urea-melamine-formaldehyde terpolymer resin adhesives, was 13.92 million tons, accounting for nearly 90% of the consumption of wood-based panel adhesives. Urea-melamine-formaldehyde ternary copolymerization can partially solve the defects of urea-formaldehyde resin adhesives such as low bonding strength, poor water resistance, large release of free form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/30B27N3/00
CPCB27N3/002C09J161/30
Inventor 韩书广甘露崔举庆徐德良丁涛王华徐朝阳
Owner NANJING FORESTRY UNIV
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