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Preparation method of environment-friendly urea-formaldehyde resin adhesive

A technology of urea-formaldehyde resin adhesives and adhesives, which is applied in the direction of adhesives, aldehyde/ketone condensation polymer adhesives, adhesive types, etc., can solve the problems of increasing production costs and unfavorable industrial applications, so as to improve capacity and reduce free Aldehyde, the effect of reducing the amount of formaldehyde used

Active Publication Date: 2020-11-10
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The above methods have all prepared urea-formaldehyde resin adhesives with low free formaldehyde content, which provides useful research results for the development of this field; but most of them have added more chemical product auxiliary agents, which increases production costs and is not conducive to industrial applications.

Method used

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  • Preparation method of environment-friendly urea-formaldehyde resin adhesive
  • Preparation method of environment-friendly urea-formaldehyde resin adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Put the formaldehyde solution and the first batch of urea in the reactor, adjust the pH to 7.5-8.5, raise the temperature to 60°C and stir at a constant temperature for 30 minutes, add the second batch of urea and raise the temperature to 80°C, adjust the pH to 5.0-5.5, until the end of the reaction, Lower the temperature to 60°C and add the third batch of urea, adjust the pH to 7.0-9.0 after 30 minutes, keep the temperature for 10 minutes and lower the temperature to obtain the urea-formaldehyde resin adhesive.

[0056] The urea purity is greater than 98wt%, and it is added in three batches, the first batch adds 70wt% of the total amount, the second batch adds 20wt% of the total amount, and the third batch adds 10wt% of the total amount.

[0057] During the reaction process, the total molar ratio F / U of formaldehyde to urea is (1.3-0.65):1.

Embodiment 2

[0059] Step 1, preparation of furfural aqueous solution

[0060] ①Put the biomass in the reaction kettle after pulverizing the biomass, add a sulfuric acid solution with a concentration of 2wt% according to the solid-to-liquid ratio of 1kg:10L, heat and reflux for 2h, filter to obtain the hydrolyzate and hydrolyzate; adjust the concentration of sulfuric acid in the hydrolyzate to 2wt% , add biomass according to the solid-to-liquid ratio of 1kg:10L, heat and reflux for 2h, repeat the hydrolysis 3 times, and obtain a xylose solution with a xylose concentration of 16.5wt%;

[0061] ②The concentration of the substance is 2mol / L of H 2 SO 4 The solution is placed in the reactor as a catalyst, and sodium chloride is added, stirred to form a stable rotating liquid surface, heated to reflux, and the xylose solution prepared in step ① is sprayed at a uniform speed in the reactor, and the xylose solution in the xylose solution is Sugar generates furfural under the action of catalyst, ...

Embodiment 3

[0068] During the reaction process, the total molar ratio of formaldehyde to urea was 1.04:1, and the amount of lignin used in the reaction was 30% of the mass of formaldehyde when the usual molar ratio of formaldehyde to urea was 1.3:1, and other conditions were consistent with Example 2.

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Abstract

The invention discloses a preparation method of environment-friendly urea resin adhesive and belongs to the field of biomass energy chemical industry. The preparation method includes the main steps of(1) producing furfural solution with biomass hemicellulose; (2) using biomass lignin to produce alkaline lignin solution; (3) using alkaline lignin and furfural as crosslinking agents to prepare urearesin adhesive with good performance, at the premise of reducing formaldehyde-urea molar ratio and improving gluing strength. The problem of the prior art that gluing strength of urea resin decreasesquickly with the reduction in the formaldehyde-urea molar ratio; an effective means to produce environment-friendly adhesives from biomass is provided.

Description

technical field [0001] The invention belongs to the field of biomass energy chemical industry and relates to a preparation method of an environment-friendly urea-formaldehyde resin adhesive. Background technique [0002] Biomass has been recognized by people because of its renewability, low pollution and richness, and the comprehensive utilization of biomass resources has attracted worldwide attention. my country is a large agricultural country, and biomass resources such as corncobs and corn stalks are very rich. However, the utilization of biomass is relatively inefficient, especially the utilization rate of lignin in biomass is very low, which seriously affects the comprehensive utilization of biomass resources. use. Lignin contains a large number of hydroxyl groups and other chemical groups, which can be grafted and copolymerized. Therefore, the use of lignin in the preparation of adhesives is an effective way to maximize the utilization of lignin. Furfural has attracte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J161/32C08G12/40
CPCC08G12/40C09J161/32
Inventor 王子忱段亚军郭玉鹏王晓峰杨晓敏
Owner JILIN UNIV