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Preparation method for water-glass modified amino resin

A technology of amino resin and water glass, applied in adhesive types, aldehyde/ketone condensation polymer adhesives, adhesives, etc., can solve the problems of reduced water-resistant bonding strength of plates, environmental pollution, etc., and achieve simple manufacturing process, The effect of reducing manufacturing cost and improving hardness

Inactive Publication Date: 2014-08-06
王笑康 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production of wood-based panels, amino resin is the most widely used adhesive in wood processing and has the largest market demand, but there are unfavorable factors such as easy release of formaldehyde during production and use, causing environmental pollution.
In the literature at home and abroad, there are many preparation methods that reduce the molar ratio of formaldehyde to urea, which is also the most effective, but it brings disadvantages such as a decrease in the water-resistant bonding strength of the board.

Method used

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  • Preparation method for water-glass modified amino resin
  • Preparation method for water-glass modified amino resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0012] 1. Raw material formula

[0013]

[0014] 2. Synthesis process

[0015] Add formaldehyde into the reaction kettle according to the above raw material formula, slowly add water glass to react with formaldehyde under stirring, make the pH value of the solution 7~9, heat to 45°C, react for 15 minutes, add the first batch of urea, and raise the temperature steadily to 90± Incubate at 2°C for half an hour to complete hydroxymethylation. Add melamine, water glass, and the second batch of urea to maintain the pH value of 7.6-8.5, keep it at 90±2°C for 40 minutes, adjust the pH value to 4-6 with formic acid, and apply -4 cups of 22-25 to the viscosity of 25°C Seconds, add water glass to keep the pH value at 7~8, add the third batch of urea, keep it at 90±2°C for 30 minutes, cool down to 70±5°C, add the remaining urea, keep it warm for 30 minutes, then lower the temperature to 40°C to lower the pH value 7 to 8 discharges.

experiment example

[0021] Adopt the common amino resin adhesive obtained by the water glass modified amino resin adhesive obtained by the embodiment of the present invention (molar ratio is 1: 1.1, solid content 54%) and comparative example (molar ratio is 1: 1.1, solid content 54%) Seven-ply plywood specimen 1 and specimen 2 were produced. Add 20-25% flour, 0.5% ammonium chloride and additive B (prepared by yourself) by resin weight when coating the glue.

[0022] The veneer is 1.7mm poplar wood Hot pressing process: pressure 1.0~1.5Mpa

[0023] Temperature: 115±5℃ Time: 60~90s / mm

[0024] Measure the formaldehyde emission of test pieces 1 and 2 by desiccator method, and measure the bonding strength and formaldehyde emission of test pieces 1 and 2 according to the provisions of GB / T17657-1999 "Test Methods for Physical and Chemical Properties of Wood-based Panels and Decorative Wood-based Panels". and bonding strength are shown in Table 1

[0025] Table 1

[0026]

[0027] As can be seen...

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Abstract

The invention discloses a preparation method for water-glass modified amino resin. According to the preparation method, water glass is employed to replace sodium hydroxide for reacting with urea and formaldehyde and further for forming an inorganically organically combined silicon-oxygen bond. The molar ratio of formaldehyde to urea is 1.1-1.86:1 during reaction, water glass accounting for 1-6% by weight of urea is employed for modification, and urea is added into formaldehyde in 2-4 proportions. The preparation method helps to improve the resin structure and improve the bonding strength, and also helps to reduce the manufacturing cost. The synthesized resin is applicable to produce multi-plywoods, block boards, floor base materials, waterproof templates, particle boards and medium-density fiberboards, and also is applicable to E1-level artificial plates.

Description

technical field [0001] The present invention relates to a kind of preparation method of modified amino resin, more specifically, it relates to a kind of preparation method of water glass modified amino resin. Background technique [0002] With the rapid development of my country's reform and opening up, the wood-based panel industry has developed by leaps and bounds. In the production of wood-based panels, amino resin is the most widely used adhesive in wood processing and has the largest market demand, but there are unfavorable factors such as easy release of formaldehyde during production and use, causing environmental pollution. In the literature at home and abroad, there are many preparation methods that reduce the molar ratio of formaldehyde to urea, which is also the most effective, but it brings disadvantages such as a decrease in the water-resistant bonding strength of the board. Contents of the invention [0003] The purpose of the present invention is to overcom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/40C09J161/32
Inventor 王笑康王国青窦红倩赵喜成刑秋
Owner 王笑康
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