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Method for preparing hydroxymethylated stalk ethanol byproduct and composite wood adhesive

A wood adhesive and methylolation technology, applied in the direction of aldehyde/ketone condensation polymer adhesive, adhesive, adhesive type, etc., can solve the problems of poor water resistance, complex composition and low activity of urea-formaldehyde resin, Achieve good preloading and curing performance, save oil resources, and realize the effect of resource utilization

Inactive Publication Date: 2014-10-08
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved: In order to solve the problem of complex raw material components of straw ethanol by-products, low activity, pretreatment such as extraction or purification; low ratio of use of biomass raw materials; poor water resistance of urea-formaldehyde resin, etc., a straw ethanol of the present invention The preparation method of by-product hydroxymethylation and composite wood adhesive, on the one hand, through the composition analysis of raw materials and the rational design of formula, realizes the use of high proportion and complete utilization of straw ethanol by-products, and achieves the goal of recycling waste Purpose; on the other hand, to improve the reactivity of straw ethanol by-products through methylolation, through the compounding of methylolated straw ethanol by-products with urea-formaldehyde resin, to introduce the polyphenolic structure of lignin, and improve the water resistance of urea-formaldehyde resin At the same time, the ethanol by-product of straw is combined with urea-formaldehyde resin, which can capture part of free formaldehyde and reduce the formaldehyde emission of the prepared wood-based panel

Method used

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  • Method for preparing hydroxymethylated stalk ethanol byproduct and composite wood adhesive
  • Method for preparing hydroxymethylated stalk ethanol byproduct and composite wood adhesive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1: Preparation of hydroxymethylated straw ethanol by-products

[0024] 1) Add 128.5g of water, 210.4g of straw ethanol by-products, and 27.7g of 36.8wt.% formaldehyde solution into a 500mL reactor, adjust the pH value to 7.0 with ammonia water, and stir for 10 minutes;

[0025] 2) Adjust the pH value of the mixing system in the reactor to 7.0 with ammonia water, then raise the temperature to 70°C, and react for 2 hours;

[0026] 3) After adjusting the pH value of the mixing system in the reactor to 6.6 with ammonia water, cool down to 50°C, add 4.5g of urea, react for 10min, cool to room temperature and discharge; test their properties respectively, and the results are listed in Attached Table 2.

[0027] Preparation of straw ethanol by-product-urea-formaldehyde resin composite adhesive: the hydroxymethylated straw ethanol by-product and urea-formaldehyde resin prepared in the first step were mixed at room temperature at a mass ratio of 1:9, 2:3, 3 : 2 mixing, and...

Embodiment 2

[0030] Step 1: Preparation of hydroxymethylated straw ethanol by-products

[0031] 1) Add 151.0g of water, 209.8g of straw ethanol by-products, 27.7g of 36.8wt.% formaldehyde solution into a 500mL reactor, adjust the pH value to 7.4 with 25wt.% hexamethylenetetramine solution, and stir for 30min;

[0032] 2) After adjusting the pH value of the mixing system in the reactor to 7.4 with 25wt.% hexamethylenetetramine solution, the temperature was raised to 75°C and reacted for 2 hours;

[0033] 3) Use 25wt.% hexamethylenetetramine solution to adjust the pH value of the mixing system in the reactor to 7.6, then cool down to 60°C, add 6.3g of melamine, react for 10min, cool to room temperature and discharge; test their properties respectively, The results are listed in Appendix Table 2.

[0034] Preparation of straw ethanol by-product-urea-formaldehyde resin composite adhesive: the hydroxymethylated straw ethanol by-product and urea-formaldehyde resin prepared in the first step wer...

Embodiment 3

[0037] Step 1: Preparation of hydroxymethylated straw ethanol by-products

[0038] 1) Add 168.8g of water, 208.6g of straw ethanol by-products, 27.7g of 36.8wt.% formaldehyde solution into a 500mL reactor, adjust the pH value to 8.1 with 30wt.% NaOH solution, and stir for 50min;

[0039] 2) After adjusting the pH value of the mixing system in the reactor to 8.2 with 30wt.% NaOH solution, the temperature was raised to 80°C and reacted for 2.5h;

[0040] 3) Use 30wt.% NaOH solution to adjust the pH value of the mixing system in the reactor to 8.2, then cool down to 70°C, add 4.5g of urea, react for 10min, cool to room temperature and discharge; test their properties respectively, and the results are listed in the attached table 2.

[0041] Preparation of straw ethanol by-product-urea-formaldehyde resin composite adhesive: the hydroxymethylated straw ethanol by-product and urea-formaldehyde resin prepared in the first step were mixed at room temperature at a mass ratio of 3:7, 2...

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Abstract

The invention discloses a method for preparing a hydroxymethylated stalk ethanol byproduct and a composite wood adhesive. The method comprises the following steps: preparing the hydroxymethylated stalk ethanol byproduct: adding water, a stalk ethanol byproduct and a formaldehyde solution into a reactor in parts by mass, adjusting the pH value by using alkali liquor, heating and stirring; adjusting the pH value of the mixed system in the reactor by using alkali liquor, and heating for reacting; adjusting the pH value of the mixed system in the reactor by using alkali liquor, cooling, adding a formaldehyde scavenger, reacting, cooling to room temperature and discharging; preparing the stalk ethanol byproduct composite wood adhesive, namely mixing the prepared hydroxymethylated stalk ethanol byproduct and urea resin or phenolic resin uniformly at room temperature to obtain the composite wood adhesive. The method disclosed by the invention can be used for achieving the purpose of recycling wastes, and reducing the formaldehyde emission of prepared artificial boards.

Description

technical field [0001] The invention relates to a method for preparing wood adhesive, in particular to a method for preparing straw ethanol by-product hydroxymethylation and composite wood adhesive. Background technique [0002] In 2013, the output of wood-based panels in my country was 272 million cubic meters, and a large amount of wood adhesives were consumed, most of which were urea-formaldehyde resin glue and phenolic resin glue. They depend heavily on petrochemical raw materials and their prices are unstable. Urea-formaldehyde resin is cheap, but its water resistance is poor, and its free formaldehyde content is high. The prepared wood-based panel has a high formaldehyde emission, which is harmful to human health. Phenolic resin has good water resistance, heat resistance and corrosion resistance, but phenol is highly toxic and expensive, which limits its large-scale application. [0003] my country produces about 300 million tons of forestry residues and 700 million ...

Claims

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Application Information

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IPC IPC(8): C09J161/06C09J161/24C09J197/00C08H7/00
Inventor 储富祥胡岚方许玉芝刘娟王春鹏陈日清
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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