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Colorless phenolic impregnated resin, preparation method and application thereof

A technology for impregnating resin and phenolic resin, applied in the field of colorless phenolic impregnating resin and its preparation, can solve the problems of limiting the application of impregnating materials, darkening the color of fast-growing wood impregnating materials, etc., and achieving the effect of improving physical and mechanical properties

Inactive Publication Date: 2011-04-06
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sodium hydroxide is one of the strong bases. It is an alkaline conventional resole phenolic resin that is catalyzed by sodium hydroxide and synthesized under strong alkaline conditions. Its appearance is reddish brown transparent uniform mucus. It is a weak base synthesized under weak alkaline conditions. The conventional resole phenolic resin has a reddish-brown transparent uniform viscous appearance. Whether poplar wood is impregnated with reddish-brown or reddish-brown phenolic resin, the color of the obtained fast-growing impregnated wood will often be darkened, covering up the natural texture and texture of the wood. The color and luster greatly limit the application of impregnated materials in the furniture industry, interior decoration industry, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Into the reactor, first add 160kg of formaldehyde aqueous solution with a mass percentage of 37%, and then add 100kg of phenol under stirring, and then add 10kg of a 45% aqueous sodium hydroxide solution; within 20min, the temperature is raised to 90°C , keep warm for 30min; cool to 35°C, slowly add 0.3kg of an aqueous solution of 0.5% by mass of sodium borohydride dropwise until the liquid becomes colorless, and discharge.

[0028] The currently prepared colorless resole phenolic resin is a transparent water-soluble liquid with a viscosity of 108mPa.s; the free aldehyde content mass percentage is 0.12%; the free phenol content mass percentage is 0.74%; Gel Permeation Chromatography (GPC) The measured number-average molecular weight of the resin was 595, and the dispersion index was 2.5; when the storage time was 25 days, the viscosity of the phenolic resin increased to 374mPa.s.

[0029] When the colorless phenolic impregnating resin is applied to the impregnation of a...

Embodiment 2

[0031] Into the reaction kettle, first add 200kg of formaldehyde aqueous solution with a mass percentage of 37%, and then add 100kg of phenol under stirring, and then add 20kg of a 45% aqueous sodium hydroxide solution; within 40min, the temperature is raised to 85°C , keep warm for 20min; cool to 45°C, slowly add 20kg of an aqueous solution of potassium borohydride with a mass percentage of 0.5% until the liquid becomes colorless, and discharge.

[0032] The resole phenolic resin of present invention is colorless transparent water-soluble liquid, viscosity 224mPa.s; Free aldehyde content mass percentage ratio is 0.10%; Free phenol content is equal to mass percentage ratio 0.58%; Adopt gel permeation chromatography (GPC) The measured number average molecular weight of the resin is 586, and the dispersion index is 2.0; when the storage time is 30 days, the viscosity of the phenolic resin increases to 541mPa.s.

[0033] When the colorless phenolic impregnating resin is applied t...

Embodiment 3

[0035] Into the reaction kettle, first add 180kg of formaldehyde aqueous solution with a mass percentage of 37%, and then add 100kg of phenol under stirring, and then add 15kg of a 45% aqueous sodium hydroxide solution; within 25min, the temperature is raised to 88°C , keep warm for 30min; cool to 40°C, slowly add 10.3kg of an aqueous solution of sodium borohydride with a mass percentage of 0.5% until the liquid becomes colorless, and discharge.

[0036]The resole phenolic resin of present invention is colorless transparent water-soluble liquid, viscosity 184mPa.s; Free aldehyde content mass percent ratio is 0.09%; Free phenol content mass percent ratio 0.49%; Adopt gel permeation chromatography (GPC) to measure The number average molecular weight of the obtained resin was 628, and the dispersion index was 2.1; when the storage time was 26 days, the viscosity of the phenolic resin increased to 462mPa.s.

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Abstract

The invention discloses a colorless phenolic impregnated resin, a preparation method and application thereof, which belong to the technical field of chemical adhesives. The colorless phenolic impregnated resin is prepared from phenol, water solution of sodium hydroxide, formaldehyde solution and water solution of strong reducing agent. The preparation method comprises the following steps: stirring the formaldehyde solution; the phenol and the water solution of sodium hydroxide; heating the temperature of the mixture to be 85-90 DEG C; cooling the mixture; slowly dropping the water solution ofstrong reducing agent; and discharging. The preparation process is simple, easy to operate, increases the production efficiency and low raw material cost and obvious industrial economic benefit. The colorless phenolic impregnated resin is applied to impregnation of fast growing wood of artificial forest; on one hand, natural grains and color and luster of wood are preserved; and on the other hand, the physical and mechanical properties of densified wood by impregnation and hot press are obviously improved.

Description

technical field [0001] The invention relates to a colorless phenolic impregnated resin and a preparation method and application thereof, belonging to the technical field of chemical adhesives. Background technique [0002] Among the four major materials (steel, cement, wood, and plastic) in the world today, wood is the only biopolymer composite material that is renewable, most environmentally friendly, and easy to recycle and recycle. Wood has beautiful texture and rich color; appropriate hardness and elasticity; good sound absorption and sound insulation; good moisture absorption and dehumidification performance, making people feel warm, natural, peaceful and comfortable. In the 21st century, when my country's economic construction is developing steadily and people's living standards are constantly improving, the construction industry, manufacturing industry, furniture industry, interior decoration industry, packaging industry and the future wooden house construction indust...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/10B27K3/38
Inventor 王志玲张玉敏矫强杨小凤杨秀利
Owner UNIV OF JINAN
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