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Modified urea-formaldehyde glue with musk smell, and preparation method thereof

A technology for modifying urea-formaldehyde and musk odor, which is applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc. It can solve the problems of poor stability, strong pungent smell, short storage time, etc., and achieve the expected The effect of improving pressure resistance, improving water solubility, and improving initial viscosity

Inactive Publication Date: 2014-02-05
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 provide a modified urea-formaldehyde glue with a musky smell and a preparation method thereof in order to solve the problems of large pungent smell, poor stability and short storage time in the existing urea-formaldehyde glue board

Method used

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Examples

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Effect test

specific Embodiment approach 1

[0016] Specific embodiment one: a kind of modified urea-formaldehyde glue with musk smell according to the present embodiment is composed of 600-700 parts by weight of 37% formaldehyde, 300-400 parts of urea, 35 parts by weight ~45 parts of melamine, 6~14 parts of 2,6-diisopropylphenol, 3~7 parts of sodium cellulose, 3~7 parts of ammonia water with a mass percentage of 25%~28% and 3~ 7 parts of polyvinyl alcohol.

[0017] The urea-formaldehyde glue of this embodiment has a low formaldehyde content, and the musk flavor of the urea-formaldehyde glue can be increased by adding propofol (2,6-diisopropylphenol), and no pungent smell will be produced during the process of making boards . The ammonia water added in the urea-formaldehyde glue of the present invention can further reduce the formaldehyde content, and the 2,6-diisopropylphenol reduces the free formaldehyde content to a very low value, and the free formaldehyde content in the urea-formaldehyde glue of the present inventi...

specific Embodiment approach 2

[0019] 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. 2,6-diisopropylphenol, 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

[0020] Specific embodiment three: a kind of preparation method of the modified urea-formaldehyde glue with musk flavor of the present embodiment is carried out according to the following steps:

[0021] 1. Weigh 600-700 parts by weight of 37% formaldehyde, 35-45 parts of melamine, 6-14 parts of 2,6-diisopropylphenol, 3-7 parts sodium cellulose, 3 to 7 parts of ammonia water with a mass percentage of 25% to 28%, and 3 to 7 parts of polyvinyl alcohol;

[0022] 2. Add the formaldehyde with a mass percentage of 37% weighed in step 1 into the reactor, add the polyvinyl alcohol weighed in step 1, and heat up through the boiler. When the pressure of the boiler reaches 0.3MPa, the formaldehyde in the reactor When the temperature reaches 30°C-35°C, adjust the formaldehyde pH to 7.5-8.0 with a caustic soda solution with a mass percentage of 25%-30%, and then add the sodium cellulose weighed in step 1;

[0023] 3. Continue heating until the temperature of formaldehyde in the reactor rea...

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Abstract

The invention relates to a modified urea-formaldehyde glue with musk smell, and a preparation method thereof, aiming at solving the problems that the existing urea-formaldehyde glue plate is large in pungent smell, poor in stability, and short in storage time. The urea-formaldehyde glue comprises formaldehyde, urea, melamine, 2,6-diisopropylphenol, sodium cellulose, ammonia hydroxide and polyvinyl alcohol. The preparation method comprises the steps: I. weighing all the components, heating to 30DEG C to 35DEG C, regulating the pH value, and adding sodium cellulose; II. heating, adding a first part of urea, and regulating the pH value; III. increasing the temperature to 92DEG C, regulating the pH value, and then insulating and reacting; IV. regulating the pH value, observing the reaction endpoint, regulating the pH value, completing the reaction, adding a second part of urea, mixing, then cooling to 70DEG C, adding a third part of urea and then adding remaining components, cooling, regulating the pH value, and putting into glue, thus obtaining the modified urea-formaldehyde glue with musk smell.

Description

technical field [0001] The invention relates to a modified urea-formaldehyde glue and a preparation method thereof. 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 tha...

Claims

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Application Information

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IPC IPC(8): C09J161/32C08G12/40
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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