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Flame-retardant modified urea-formaldehyde glue and application thereof

A technology for modifying urea-formaldehyde and urea-formaldehyde adhesives, used in adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of poor flame retardancy, poor stability of urea-formaldehyde adhesives, and short storage time. Improve flame retardant performance, save work efficiency, and improve the effect of initial viscosity

Inactive Publication Date: 2015-02-04
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of poor flame retardancy, poor stability of urea-formaldehyde glue and short storage time in the preparation of wood-based panels by using urea-formaldehyde glue, and to provide a kind of flame-retardant modified urea-formaldehyde glue and its application

Method used

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Examples

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specific Embodiment approach 1

[0018] Specific embodiment 1: A flame-retardant modified urea-formaldehyde glue of this embodiment is composed of 600-700 parts by weight of 37% formaldehyde, 300-400 parts of urea, 35-45 3-7 parts of melamine, 6-14 parts of 4-bromophenol, 3-7 parts of cellulose sodium, 3-7 parts of ammonia water with a mass percentage of 25%-28% and 3-7 parts of polyvinyl alcohol. become.

[0019] In this embodiment, the wood-based panel is prepared by adding urea-formaldehyde glue formed by 4-bromophenol, which can further improve the flame-retardant performance of the wood-based panel, and can make the wood-based panel achieve the flame-retardant effect.

[0020] The ammonia water added in the urea-formaldehyde glue of this embodiment can further reduce the formaldehyde content, and the added 4-bromophenol can further increase the hot water property of the glue and reduce the free formaldehyde content to a very low value. In the urea-formaldehyde glue of this embodiment Free formaldehyde c...

specific Embodiment approach 2

[0022] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the urea-formaldehyde glue is 37% formaldehyde, 333 parts of urea, 40 parts of melamine, 10 parts of urea-formaldehyde glue in parts by weight. 4-bromophenol, 5 parts of sodium cellulose, 5 parts of ammonia water with a mass percentage of 25% to 28% and 5 parts of polyvinyl alcohol. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0023] Embodiment 3: A modified urea-formaldehyde glue of this embodiment is used as a flame retardant material for the preparation of wood-based panels.

[0024] In this embodiment, the wood-based panel is prepared by adding urea-formaldehyde glue formed by 4-bromophenol, which can further improve the flame-retardant performance of the wood-based panel, and can make the wood-based panel achieve the flame-retardant effect.

[0025] The ammonia water added in the urea-formaldehyde glue of this embodiment can further reduce the formaldehyde content, and the added 4-bromophenol can further increase the hot water property of the glue and reduce the free formaldehyde content to a very low value. In the urea-formaldehyde glue of this embodiment Free formaldehyde content is less than 0.1%.

[0026] The cellulose sodium in the urea-formaldehyde glue of the present embodiment can improve the initial viscosity of the glue, improve the water solubility of the glue, and improve the stabil...

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Abstract

The invention discloses flame-retardant modified urea-formaldehyde glue and an application thereof and aims to solve the problems that an artificial board prepared by existing urea-formaldehyde glue is low in flame-retardant property and the urea-formaldehyde glue is low in stability and short in storage time. The urea-formaldehyde glue consists of formaldehyde, urea, melamine, 4-bromophenol, cellulose sodium, ammonia water and polyvinyl alcohol. The preparation method comprises the following steps: (1) weighing various components, heating to the temperature of 30-35 DEG C, regulating a pH value, and adding the cellulose sodium; (2), heating, adding a first part of urea, and regulating the pH value; (3) raising the temperature to be 92 DEG C, regulating the pH value, and keeping the temperature for reacting; and (4) regulating the pH value, observing a reaction endpoint, regulating the pH value, ending the reaction, adding a second part of urea, mixing, reducing the temperature to be 70 DEG C, adding a third part of urea, adding the residual components, reducing the temperature, regulating the pH value, and discharging the glue. The content of free formaldehyde in the urea-formaldehyde glue is lower than 0.1 percent. The storage time of the glue is two months. The method is applied to the field of urea-formaldehyde glue.

Description

technical field [0001] The invention relates to a modified urea-formaldehyde glue and its application. Background technique [0002] At present, the main raw materials of urea-formaldehyde glue used in wood processing industry are formaldehyde and urea. Among them, the content of formaldehyde is very high, and formaldehyde has the characteristics of strong volatility. The volatile gas is highly irritating to people and harmful to human health. Therefore, the study of low-toxicity urea-formaldehyde glue has become an urgent problem to be solved. In recent years, there have been related reports and researches. The use of a new type of modified urea-formaldehyde glue can reduce the free formaldehyde content to less than 0.5%. Low, thereby increasing the labor intensity, which is not conducive to the improvement of work efficiency, and the existing urea-formaldehyde glue has the danger of curing during the glue mixing process. For example, when the pH is lower than 4.6 when mi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/32C09J9/00C08G12/40
Inventor 王阳张宇张冬梅潘宇峰高桐刘健王勇战
Owner HEILONGJIANG UNIV
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