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A kind of preparation method of toughening agent for melamine resin

A melamine and toughening agent technology, which is applied in the field of melamine resin production, can solve the problems of large amount of addition, adverse effects of resin heat resistance, adverse effects of resin surface gloss and transparency, etc., to improve bendability and flexibility Effect

Active Publication Date: 2018-10-12
YICHANG WUXING DECORATING PLATE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to achieve the desired effect, the former method requires a large amount of addition and has an adverse effect on the heat resistance of the resin.
The latter method will adversely affect the surface gloss and transparency of the cured resin, which is unacceptable for melamine resins used as surface decoration

Method used

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  • A kind of preparation method of toughening agent for melamine resin
  • A kind of preparation method of toughening agent for melamine resin
  • A kind of preparation method of toughening agent for melamine resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of preparation method of toughening agent for melamine resin, its steps are:

[0024] 1. Add 160 or 165 or 170 or 175 or 180 parts of industrial formaldehyde solution to the reaction kettle, adjust the pH value to 8.0 or 8.2 or 8.4 or 8.5 with sodium hydroxide, start to heat up, and raise the temperature to 48 or 49 or 50 or 51 or 52 ℃, add 70 or 73 or 75 parts of melamine, rapidly raise the temperature to 70 or 73 or 75 ℃, keep the temperature for 20 or 23 or 25 minutes, then rapidly cool down to 20 or 23 or 25 ℃ to obtain methylolated melamine ,spare.

[0025] 2. Add 150 parts of water and 50 or 55 or 60 parts of polyetheramine d230 into the reactor, and start to heat up to 60°C. After the polyetheramine is completely dissolved, add 20 or 22 or 25 parts of the methylolated melamine prepolymer synthesized in the first step, add sodium hydroxide to keep the pH value of the reaction solution at 8.0 or 8.3 or 8.5, and heat up to 80 or 83 Or 85 ℃ and heat preserva...

Embodiment 2

[0036] A kind of preparation method of toughening agent for melamine resin, its steps are:

[0037] 1. Add 160 or 170 or 180 parts of formaldehyde to the reaction kettle, adjust the pH value to 8.0 with triethylamine, and start to heat up. When the temperature rises to 70°C, add 75, 77, or 80 parts of melamine, rapidly raise the temperature to 70, 73, or 75°C, keep the temperature for 20, 22, or 25 minutes, and then rapidly cool down to room temperature (20-25°C) to obtain methylol Thinened melamine, set aside.

[0038] 2. Add 140 parts of water and 50-60 parts of polyetheramine ED900 into the reaction kettle, and start to heat up to 60°C. After the polyetheramine is uniformly dispersed, add 25-30 parts of the prepolymer synthesized in the first step, add triethylamine to keep the pH value of the reaction solution at 8.0 or 8.3 or 8.5, heat up to 80 or 83 or 85°C and keep the reaction at 70 or 77 Or 80 or 84 or 88 or 9090 minutes. After the reaction, cool down to 20 or 23 o...

example 2

[0045] When the flexibilizer of example two adds more, it has a greater negative impact on the surface gloss of the original triamine resin relative to example one.

[0046] According to the national standard GB / T 18102-2007, the wear-resistant speed of the finished plate is tested, accurate to 100 revolutions.

[0047]

[0048]Adding the toughening agent of Example 2 also has a certain adverse effect on the wear resistance of the plate, and the impact is greater than that of Example 1.

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Abstract

The invention discloses a preparation method of a toughening agent for melamine resin. The preparation method comprises the steps that 1, an industrial formaldehyde water solution is added into a reaction kettle, a PH value is adjusted by using sodium hydroxide, heating begins, melamine is added during heating, rapid heating is performed, and hydroxymethylated melamine is obtained after heat preservation reaction and rapid cooling for usage; 2, polyether amined230 is added into the reaction kettle, and heating begins. After the polyether amine is completely dissolved, the hydroxymethylated melamine synthesized in the first step is added, the sodium hydroxide is added to keep the PH value of the reaction solution, and heating and heat preservation reaction are performed. Cooling is performed after reaction is completed, and a milk white emulsion, namely the synthetic toughening agent, is obtained. The preparation method is easy to operate and simple and convenient to operate, the bending property of a melamine resin plate can be remarkably improved, the surface gloss,transparency and other surface appearance properties of the melamine resin after curing are not affected, and no great negative effect is played on the original abrasion resisting performance and scratch resistant performance of the resin.

Description

technical field [0001] The invention relates to the technical field of melamine resin production, in particular to a method for preparing a novel toughening agent for melamine resin. The toughening agent for melamine resin is mainly used in the manufacture of glued wood adhesives. Background technique [0002] At present, melamine formaldehyde resin is generally used on the surface of wood-based panels. The resin has the advantages of colorless, transparent, heat-resistant, wear-resistant, flame-retardant, and stable product size. However, after curing, the resin has relatively high hardness and high brittleness, and the manufactured wood-based panels have disadvantages such as not easy to bend, easy to break and crack on the surface. [0003] Modern professional training is characterized by personalization and functional development. Many places have complex curved surface shapes. Traditional brittle wood-based panels have poor bendability and are no longer suitable for dem...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/40C08L61/30C08L61/32
CPCC08G12/40C08L61/30C08L2205/02C08L61/32
Inventor 肖圣洁
Owner YICHANG WUXING DECORATING PLATE