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Method for preparing isobutyl aldehyde modified urea-formaldehyde resin adhesive

A technology of urea-formaldehyde resin and isobutyraldehyde, applied in adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., to achieve good initial tack, low free formaldehyde content, and improved weather resistance

Inactive Publication Date: 2016-05-18
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the 1990s, BASF developed urea-isobutyraldehyde-formaldehyde resin for general color paste of paint / ink, and the use of isobutyraldehyde modified urea-formaldehyde resin adhesive for wood processing has not been reported so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add the first batch of 1000kg of urea and 2400kg of 37% industrial formaldehyde to a 5 cubic meter reactor, stir and raise the temperature. After the urea is completely dissolved, adjust the pH to 7-8 with a 20-30% sodium hydroxide aqueous solution, and raise the temperature to React at 90°C for 40 minutes; adjust the pH to 3-4 with 30-50% dilute sulfuric acid. When the temperature is lowered to 80°C, add the second batch of 400kg of urea. After stirring, add 400kg isobutyraldehyde gradually, keep the temperature at 80°C for 60 minutes ; Add the third batch of 250kg urea, keep the temperature at 60℃ and stir for 40min; add the fourth batch of 200kg urea, stir for 20min, adjust the pH to 7-8 with 20-30% sodium hydroxide aqueous solution, and cool to below 40℃, Discharge to obtain isobutyraldehyde modified urea-formaldehyde resin wood adhesive.

Embodiment 2

[0030] Add the first batch of 1000kg of urea and 2000kg of 37% industrial formaldehyde to a 5 cubic meter reactor, stir and raise the temperature. After the urea is completely dissolved, adjust the pH to 7-8 with triethanolamine, and raise the temperature to 85°C for 60min reaction; Adjust the PH value to 3-4. When the temperature is lowered to 70℃, add the second batch of 300kg urea. After stirring evenly, gradually add 350kg isobutyraldehyde, keep at 70℃ and react for 40min; add the third batch of 250kg urea, keep the temperature at 60℃ and stir. Reaction for 60min; add the fourth batch of 150kg urea, stir for 20min, adjust the pH to 7-8 with triethanolamine, cool to below 40°C, and discharge to obtain an isobutyraldehyde modified urea-formaldehyde resin wood adhesive.

Embodiment 3

[0032] Add the first batch of 1000kg of urea and 2600kg of 37% industrial formaldehyde to a 5 cubic meter reactor, stir and raise the temperature. After the urea is completely dissolved, adjust the pH to 7-8 with 20-30% sodium hydroxide aqueous solution, and heat to React at 85°C for 60 minutes; adjust the pH to 3-4 with formic acid. When the temperature is lowered to 80°C, add the second batch of 300kg urea. After stirring evenly, gradually add 500kg isobutyraldehyde and react at 80°C for 40 minutes; add the third batch of 250kg Urea, keep the temperature at 70℃ and stir for 40min; add the fourth batch of 150kg urea, stir for 20min, adjust the pH value to 7-8 with 20-30% sodium hydroxide aqueous solution, cool to below 40℃, discharge to obtain isobutyraldehyde Modified urea-formaldehyde resin wood adhesive.

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Abstract

The invention relates to a method for preparing isobutyl aldehyde modified urea-formaldehyde resin. The method includes the steps that a certain quantity of urea and formaldehyde react for 30-60 minutes with the pH value being 7-8 at the temperature of 85-90 DEG C, the pH value is adjusted to 3-4, a second batch of urea is added, after the mixture is stirred to be uniform, isobutyl aldehyde is added step by step, and a reaction is conducted for 40-60 minutes at the temperature of 60-80 DEG C; the temperature is lowered to 60-80 DEG C, then a third batch of urea and a fourth batch of urea are added in a batched mode, the pH value is adjusted to 7-8, the mixture is cooled to 40 DEG C and below, material discharging is conducted, and the isobutyl aldehyde modified urea-formaldehyde resin adhesive is obtained. The preparation method is simple, and the prepared urea resin has the advantages of being low in content of free formaldehyde, good in storage stability, high in adhesion strength, good in water resistance and the like.

Description

Technical field [0001] The invention relates to the technical field of wood processing and adhesives, in particular to a wood adhesive used for artificial boards and a preparation method thereof. Background technique [0002] my country's forest coverage rate is low, and wood resources are seriously insufficient. Therefore, using small-diameter wood and fast-growing wood to prepare wood-based panels to meet people's needs for wood processing products has always been an important approach and method for my country's wood processing industry. my country is the country with the largest output of wood-based panels in the world. For many years, the output of wood-based panels has been ranked first in the world. In 2015, the output of wood-based panels has increased to 30,123,300 cubic meters. The development of the wood-based panel industry has increased the demand for wood adhesives. . [0003] Urea-formaldehyde resin adhesives are widely used in the production and processing of wood-b...

Claims

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Application Information

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IPC IPC(8): C09J161/32C08G12/42
CPCC08G12/422C09J161/32
Inventor 张一甫黎小波陈文渊黄家毅秦志永甘卫星
Owner GUANGXI UNIV
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