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Synthesis method of urea-melamine-formaldehyde ternary copolymerization resin precipitation and its application as amino resin adhesive improver

A technology of formaldehyde ternary copolymerization resin and melamine, which is applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesives, adhesive types, etc., can solve the problems of high price, high modification cost, and complicated preparation methods of related nanomaterials, etc. problem, to achieve the effect of improving the bonding strength and reducing the amount of formaldehyde emission

Active Publication Date: 2016-04-13
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above methods all use inorganic nanomaterials, and the preparation methods of related nanomaterials are relatively complicated and expensive, resulting in high modification costs, which are not suitable for the current situation of low-cost manufacturing in the wood-based panel industry.

Method used

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  • Synthesis method of urea-melamine-formaldehyde ternary copolymerization resin precipitation and its application as amino resin adhesive improver
  • Synthesis method of urea-melamine-formaldehyde ternary copolymerization resin precipitation and its application as amino resin adhesive improver
  • Synthesis method of urea-melamine-formaldehyde ternary copolymerization resin precipitation and its application as amino resin adhesive improver

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) the pH of the formaldehyde solution with a concentration of 35% is adjusted to 4 with adipic acid;

[0024] (2) Formaldehyde in molar ratio: melamine: urea=1:0.6:0.4, industrial urea and melamine are added in the industrial formaldehyde solution;

[0025] (3) React at 70°C under stirring conditions, continue to stir for 2 hours when white cloud-like turbidity appears, then drop to room temperature to obtain a urea-melamine-formaldehyde ternary copolymer resin precipitation solution;

[0026] (4) Homogenize the obtained urea-melamine-formaldehyde ternary copolymer resin precipitation solution by ultrasonic oscillation for 120 minutes; ultrasonic power ultrasonic oscillation power 1200W;

[0027] (5) Suction filter the urea-melamine-formaldehyde ternary copolymer resin precipitation solution to obtain the urea-melamine-formaldehyde ternary copolymer resin precipitate, wash with water until neutral, and dry at 40° C. to constant weight.

[0028] The obtained urea-mela...

Embodiment 2

[0030] (1) be that the formaldehyde solution pH of 38% is adjusted to 1 with sulfuric acid;

[0031] (2) formaldehyde in molar ratio: melamine: urea=0.8:0.9:0.1, industrial urea and melamine are added in the industrial formaldehyde solution;

[0032] (3) react under stirring conditions at 30°C, continue to stir and react for 1 hour when white cloud-like turbidity appears, then drop to room temperature to obtain urea-melamine-formaldehyde ternary copolymer resin precipitation solution;

[0033] (4) The obtained urea-melamine-formaldehyde ternary copolymer resin precipitation solution is homogenized by ultrasonic vibration, and the processing time is 70min; the ultrasonic power is 1000W;

[0034] (5) Suction filter the urea-melamine-formaldehyde ternary copolymer resin precipitation solution to obtain the urea-melamine-formaldehyde ternary copolymer resin precipitate, wash with water until neutral, and dry at 30° C. to constant weight.

[0035] The particle size range of the ob...

Embodiment 3

[0037] (1) the pH of the formaldehyde solution with a concentration of 37% is adjusted to 5 with formic acid;

[0038] (2) Formaldehyde in molar ratio: melamine: urea=0.5:0.1:0.9, industrial melamine is added in the industrial formaldehyde solution;

[0039] (3) React at 90°C under stirring conditions, and continue to stir for 3 hours when white cloud-like turbidity occurs, and then drop to room temperature to obtain a urea-melamine-formaldehyde ternary copolymer resin precipitation solution;

[0040] (4) Homogenize the obtained urea-melamine-formaldehyde ternary copolymer resin precipitation solution by ultrasonic vibration for 20 minutes; ultrasonic power 1500W;

[0041] (5) Suction filter the urea-melamine-formaldehyde ternary copolymer resin precipitation solution to obtain the urea-melamine-formaldehyde ternary copolymer resin precipitate, wash with water until neutral, and dry at 70° C. to constant weight.

[0042] The obtained urea-melamine-formaldehyde ternary copolym...

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Abstract

The invention discloses a synthetic method of a carbamide-melamine-formaldehyde ternary polymerization resin precipitation. The synthetic method comprises the following steps: regulating the pH value of a formaldehyde solution to 1-5 by using strong acid; adding carbamide and melamine to the formaldehyde solution according to the mole ratio of formaldehyde / (carbamide+melamine) being 0.5-1; reacting at 30-90 DEG C under the condition of stirring, reducing to room temperature to obtain a carbamide-melamine-formaldehyde ternary polymerization resin precipitation solution; and carrying out ultrasonic concussion homogenization treatment on the obtained carbamide-melamine-formaldehyde ternary polymerization resin precipitation solution, then carrying out suction filtration, washing to neutrality, and drying under the condition of 30-70 DEG C. The invention also discloses an application of the carbamide-melamine-formaldehyde ternary polymerization resin precipitation as an amine resin adhesive improver. The carbamide-melamine-formaldehyde ternary polymerization resin precipitation can enhance the adhesion strength of an amine resin adhesive and reduce the formaldehyde emission content without changing the process condition of the usage of the amine resin adhesive in an artificial board industry.

Description

technical field [0001] The invention relates to a synthesis method of urea-melamine-formaldehyde ternary copolymer resin precipitation and its application as an amino resin adhesive improver, belonging to the field of wood-based panel adhesive manufacture. Background technique [0002] Amino resin adhesives are the most used adhesives in the wood industry, accounting for more than 90% of the glue used in wood-based panel production. Due to their cost advantages, they cannot be replaced by other adhesives so far. The biggest problem in the use of the amino resin adhesives produced by the prior art is that the water resistance, especially the hot water resistance, is not strong. In addition, due to the lack of formula design, the formaldehyde release of the glued products is relatively large, which has been plagued by wood. Industrial production and use by end-users of wood-based panels. [0003] Adding urea in stages to reduce the final molar ratio to synthesize urea-formald...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/38C09J161/24C09J161/28C09J161/30
Inventor 韩书广晏少侠周兆兵崔举庆黄润州贾翀徐朝阳周晓燕卢晓宁曹平祥
Owner NANJING FORESTRY UNIV