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Adhesive for artificial board, and preparation method and application thereof

A technology for adhesives and wood-based panels, applied in the direction of adhesives, adhesive types, polymer adhesive additives, etc., can solve the problems of increasing slab density, prolonging hot pressing time, and large amount of adhesives, so as to improve bonding strength, The effect of increasing crosslink density and increasing strength

Active Publication Date: 2013-06-26
北京海天科林技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the disadvantages of producing F4 star wood-based panels are: 1. The amount of adhesive is large or melamine is added; 2. The density of the slab is increased; 3. The hot pressing time is prolonged

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1, accurately weigh the following raw materials:

[0030] Mass concentration is 200g of formaldehyde aqueous solution of 37%, urea 150g, polyvinyl alcohol 1g, melamine 12g, formaldehyde trapping agent 8g (wherein tetraethylenepentamine 4g, sodium sulfite 0.8g, water 3.2g), crosslinking agent 0.5g (wherein, Blocked isocyanate W-8235 (Jiangyin Moore Chemical New Material Co., Ltd.) 0.3g, maltodextrin 0.2g).

[0031] Add formaldehyde aqueous solution and polyvinyl alcohol in the reaction kettle successively, heat up to 45 ℃, keep warm for 15 minutes; Regulate the pH of reaction solution with the sodium hydroxide aqueous solution of 30% mass concentration to be 8.8, add the first batch of urea 60g (i.e. 40% of the total mass of urea), then open the steam valve of the reactor and heat up to 60-70°C, close the steam, allow it to heat up to 90°C, and keep it warm for 60 minutes;

[0032] Use 30% sodium hydroxide solution to adjust the pH to 4.4, and react to viscos...

Embodiment 2

[0038] Accurately weigh the following raw materials:

[0039] Mass concentration is 200g of formaldehyde aqueous solution of 35%, urea 165g, polyvinyl alcohol 2g, melamine 14g, formaldehyde capture agent 7g (wherein polyethyleneimine 1.4g, urea 2.8g, water 2.8g), crosslinking agent 1g (wherein, Water-based isocyanate CGC (Anqing Zhongda Chemical Technology Co., Ltd.) 0.9g, corn starch 0.1g).

[0040] Formaldehyde aqueous solution and polyvinyl alcohol are successively added in the reaction kettle, be warmed up to 45 ℃, keep warm for 18 minutes; Be that the pH of reaction solution is adjusted to 8.8 with the sodium hydroxide aqueous solution of 15% mass concentration, add the first batch of urea 82.5g ( That is 50% of the total mass of urea), then open the steam valve of the reactor and heat up to 60-70°C, close the steam, allow it to heat up to 95°C, and keep it warm for 30 minutes;

[0041] Use 15% sodium hydroxide solution to adjust the pH to 5.0, and react to viscosity: appl...

Embodiment 3

[0046] Embodiment 3, accurately weigh the following raw materials:

[0047] Mass concentration is 200g of formaldehyde aqueous solution of 40%, urea 170g, polyvinyl alcohol 2g, melamine 13g, formaldehyde scavenger 5g (wherein 2.5 melamine, 2g soybean powder, 0.5g sodium sulfite), crosslinking agent 2g (wherein, 1.9 water-based isocyanate, 0.1g tapioca starch).

[0048] Aqueous formaldehyde solution and polyvinyl alcohol are successively added in the reaction kettle, the temperature is raised to 45° C., and the temperature is kept for 15 minutes; the pH of the reaction solution is adjusted to 7.0 with an aqueous solution of sodium hydroxide with a mass concentration of 30%, and the first batch of urea 68 g (i.e. 40% of the total mass of urea), then open the steam valve of the reactor and heat up to 60°C, close the steam, allow it to heat up to 75°C, and keep the temperature for 45 minutes;

[0049] Use 30% sodium hydroxide solution to adjust the pH to 5.5, and react to viscosi...

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Abstract

The invention relates to an adhesive for producing an artificial board having a strong strength and a low formaldehyde release amount, and a preparation method and an application of the adhesive in the artificial board production field. The adhesive comprises the following components, by weight, 200 parts of formaldehyde, 150-170 parts of urea, 1-3 parts of polyvinyl alcohol, 12-15 parts of melamine, 5-8 parts of a formaldehyde catching agent, and 0.5-2 parts of a cross-linking agent, wherein the formaldehyde is an aqueous formaldehyde solution having a mass concentration of 35-40%. The preparation method of the adhesive comprises the following steps: adding urea three times, adding the formaldehyde catching agent and the cross-linking agent in the resin synthesis, and sequentially carrying out reactions in a weak alkaline medium, an acidic medium and a neutral medium. The artificial adhesive-bonded board produced through using the adhesive has a low formaldehyde release amount and a bonding strength reaching requirements of Chinese standard adhesive-bonded boards II.

Description

technical field [0001] The invention relates to an adhesive and its preparation method and application, in particular to an adhesive for producing wood-based panels with high strength and low formaldehyde emission, its preparation method and its application in the field of wood-based panel production. Background technique [0002] In 2004, the World Health Organization issued Bulletin No. 153, announcing formaldehyde as a primary carcinogen. In my country, the priority control of toxic chemicals is on the control list, and formaldehyde ranks second. Formaldehyde pollution in the living room is mainly caused by boards and furniture. Most of the plywood used for interior decoration and furniture manufacturing uses urea-formaldehyde resin adhesives, which release harmful gases such as formaldehyde for a long time, thus becoming an invisible killer that threatens human health. With the continuous enhancement of people's awareness of environmental protection and higher health re...

Claims

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Application Information

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IPC IPC(8): C09J161/30C09J11/06C09J11/08C09J11/04C08G12/38B27D1/04
Inventor 雷得定蔡喜庆刘波
Owner 北京海天科林技术有限公司
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