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Flexible water-resistant silicate wood adhesive and preparation method thereof

A kind of wood adhesive, silicate technology

Active Publication Date: 2013-01-09
CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when the unmodified silicate adhesive is bonded to wood materials, it is prone to defects such as high brittleness and poor water resistance of the cured adhesive, which greatly limits the application of silicate adhesives in the wood field.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Dissolve 15 parts by weight of cellulose acetate in 18 parts by weight of acetone to prepare a cellulose acetate solution, which is sealed for use. Add 5 parts by weight of N,N-dimethylformamide and 2 parts by weight of dimethylolacetic acid into a 250ml round bottom flask protected by dry N2, stir well, add 5 parts by weight of isophorone diisocyanate and 0.05 parts by weight Parts of dibutyltin dilaurate, react at 75°C for 180min, and distill under reduced pressure to obtain polyurethane prepolymer. Add the polyurethane prepolymer to a triethanolamine solution prepared by dissolving 3 parts by weight of triethanolamine in 20 parts by weight of deionized water, stir at high speed at room temperature, and emulsify for 30 minutes; then add cellulose acetate solution, and emulsify at 65°C After 150 minutes, a cellulose acetate emulsion was prepared. Add cellulose acetate emulsion to 100 parts by weight of sodium silicate solution, react at 75°C for 120 minutes, then add ...

Embodiment 2

[0029] Dissolve 20 parts by weight of cellulose acetate in 24 parts by weight of acetone to prepare a cellulose acetate solution, which is sealed for use. Add 6 parts by weight of N,N-dimethylformamide and 3 parts by weight of dimethylolpropionic acid into a 250ml round bottom flask protected by dry N2, stir well, add 6 parts by weight of diphenylmethane diisocyanate and 0.06 Dibutyltin dilaurate in parts by weight, reacted at 85°C for 160min, and distilled under reduced pressure to obtain a polyurethane prepolymer. Add the polyurethane prepolymer to a diethanolamine solution prepared by dissolving 4.5 parts by weight of diethanolamine in 30 parts by weight of deionized water, stir at high speed at room temperature, and emulsify for 60 minutes; then add cellulose acetate solution, and emulsify at 75°C After 120 minutes, a cellulose acetate emulsion was prepared. Add cellulose acetate emulsion to 120 parts by weight of lithium silicate solution, react at 80°C for 90 minutes, t...

Embodiment 3

[0031] Dissolve 25 parts by weight of cellulose acetate in 31 parts by weight of acetone to prepare a cellulose acetate solution, which is sealed for use. Add 8 parts by weight of N,N-dimethylformamide and 4 parts by weight of dihydroxyphenylpropionic acid into a 250ml round bottom flask protected by dry N2, stir well, add 8 parts by weight of 1,6-hexamethylene diisocyanate and 0.1 Dibutyltin dilaurate in parts by weight, reacted at 100°C for 60 minutes, and distilled under reduced pressure to obtain a polyurethane prepolymer. Add the polyurethane prepolymer to a triethanolamine solution prepared by dissolving 6 parts by weight of triethanolamine in 50 parts by weight of deionized water, stir at high speed at room temperature, and emulsify for 90 minutes; then add cellulose acetate solution, and emulsify at 90°C 90min to prepare cellulose acetate emulsion. Add cellulose acetate emulsion to 150 parts by weight of potassium silicate solution, react at 95°C for 60 minutes, then ...

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PUM

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Abstract

The invention discloses a flexible water-resistant silicate wood adhesive and a preparation method thereof. The flexible water-resistant silicate wood adhesive is prepared by uniting an acetic acid cellulose emulsion, calcium stearate and a modified silicate solution and comprises components of, by weight, 100-150 parts of a silicate solution, 15-25 parts of acetic acid cellulose, 18-31 parts of acetone, 5-8 parts of isocyanate, 2-4 parts of a hydrophilic chain-extending agent, 5-8 parts of N,N-dimethyl formamide, 0.05-0.1 part of dibutyltin dilaurate, 3-6 parts of organic amine, 0.5-1.5 parts of an accelerating agent, 5-10 parts of the calcium stearate and 20-50 parts of deionized water. The preparation method includes two steps of polymerization preparation of the acetic acid cellulose emulsion by using a self-emulsifiable soap-free emulsion and preparation of the silicate adhesive. According to the flexible water-resistant silicate wood adhesive, performances of gluing materials are excellent.

Description

technical field [0001] The invention relates to a wood adhesive, specifically a silicate wood adhesive with good flexibility, high water resistance and strong adhesion and a preparation method thereof. Background technique [0002] Silicate adhesive mainly refers to the adhesive with alkali metal silicate as the main component. Due to the low price of raw materials, simple preparation process, non-toxic and pollution-free, small bonding stress, temperature resistance, fire resistance, and Outstanding characteristics such as excellent aging performance, silicate adhesives occupy a unique position in the field of adhesives, have broad development prospects, and are widely used in bonding metals, ceramics, glass, stone and paper products. The application of silicate adhesives in the field of wood bonding can not only avoid the pollution of aldehydes and other toxic compounds caused by the use of organic adhesives, but also reduce the energy consumption of wood-based panel produ...

Claims

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Application Information

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IPC IPC(8): C09J1/02C09J11/06
Inventor 吴义强张新荔李新功李贤军胡云楚卿彦刘晓梅姚春花龙科泉朱晓丹杨建铭
Owner CENTRAL SOUTH UNIVERSITY OF FORESTRY AND TECHNOLOGY
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