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Anti-aging modified urea-formaldehyde glue and preparation method thereof

A modified urea-formaldehyde, anti-aging technology, applied in adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of poor anti-aging performance, poor stability, and short storage time of urea-formaldehyde adhesives. Achieve the effects of saving work efficiency, improving pre-compression, and increasing storage period

Inactive Publication Date: 2014-03-26
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 an anti-aging modified urea-formaldehyde glue and its preparation method in order to solve the problems of poor anti-aging performance, poor stability and short storage time of the existing urea-formaldehyde glue

Method used

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Examples

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Comparison scheme
Effect test

specific Embodiment approach 1

[0016] Specific embodiment 1: An anti-aging 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 melamine, 4.5 to 10.5 parts of 2-naphthol, 3 to 7 parts of 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 become.

[0017] The ammonia water added to the urea-formaldehyde glue in this embodiment can further reduce the formaldehyde content and reduce the free formaldehyde content to a very low value. The free formaldehyde content in the urea-formaldehyde glue in this embodiment is less than 0.1%.

[0018] The cellulose sodium in the urea-formaldehyde glue of this embodiment can improve the initial viscosity of the glue, improve the water solubility of the glue, enable the urea-formaldehyde glue to react in an environment of 8°C to 10°C, improve the stability of the urea-formaldehyde glue; and enable the glue to be stored ...

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 urea, 40 parts melamine, 7 parts 2-naphthol, 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: the preparation method of an anti-aging modified urea-formaldehyde glue of the present embodiment is carried out according to the following steps: 1. Take 600-700 parts by weight of formaldehyde with a mass percentage of 37% , 35-45 parts of melamine, 4.5-10.5 parts of 2-naphthol, 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;

[0021] 2. Add the formaldehyde with a mass percentage of 37% weighed in step 1 into the reaction kettle, and heat it up through the boiler. When the pressure of the boiler reaches 0.3MPa and the temperature of formaldehyde in the reaction kettle reaches 30°C to 35°C, use The caustic soda solution with a mass percentage of 25% to 30% adjusts the pH of formaldehyde to 7.5 to 8.0, and then adds the sodium cellulose weighed in step 1;

[0022] 3. Continue heating until the temperature of formaldehyde in the reactor reaches 36°C-40°C, adjust t...

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Abstract

The invention relates to an anti-aging modified urea-formaldehyde glue and a preparation method thereof, and solves the problems of poor anti-aging performance, poor stability and short storing time in the conventional anti-aging modified urea-formaldehyde glue. The urea-formaldehyde glue is composed of formaldehyde, urea, melamine, 2-isonaphthol, cellulose sodium, ammonia water and polyving akohol. The preparation method comprises the following steps: 1, weighing all components, heating to 30 to 35 DEG C, adjusting the pH value, and adding the cellulose sodium; 2, heating, adding a first part of urea and adjusting a pH value; 3, increasing the temperature to 92 DEG C, adjusting the pH value and then carrying out thermal reaction; 4, adjusting the pH value, observing a reaction final point, adjusting the pH value to finish the reaction, adding a second part of urea, mixing, then lowering the temperature to 70 GED C, adding a third part of urea and then adding the left components, lowering the temperature, adjusting the pH value, and releasing the gule. The content of free formaldehyde in the urea-formaldehyde glue is lower than 0.1 percent, and the storage time is more than 2 months. The anti-aging modified urea-formaldehyde glue provided by the invention is applied to the field of urea-formaldehyde glue.

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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Patent Type & Authority Applications(China)
IPC IPC(8): C09J161/32C09J11/08C08G12/40
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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