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Method for preparing modified urea resin for coating abrasive tools

A technology of urea-formaldehyde resin and coated abrasives, which is applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesive types, adhesives, etc., which can solve the problems of unsatisfactory bonding strength and poor heat resistance, and achieve heat resistance Improvement of sex and bonding strength, reduction of environmental pollution, and reduction of free formaldehyde

Inactive Publication Date: 2011-09-28
胡应模
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the disadvantages of poor heat resistance and adhesive strength of urea-formaldehyde resin that cannot meet the application standards of adhesives in the coated abrasive industry, the invention provides a preparation method of urea-formaldehyde resin modified by soluble starch, glycerin and modified hydroxyl silicone oil

Method used

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  • Method for preparing modified urea resin for coating abrasive tools

Examples

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example 1

[0018] Under full stirring, weigh 40g of 37% formaldehyde aqueous solution and 0.015g of catalyst sodium hydroxide, add them into a four-neck flask with reflux condensation, add 8g of urea after the sodium hydroxide is completely dissolved, raise the temperature to 60°C and control the reaction The time is 30min, add 5g of urea, adjust the temperature to 85°C and maintain the reaction time for 90min, add 1.4g of glycerin, and then add 0.02g of acidic pH regulator ammonium chloride, control the reaction temperature to 95°C, and the reaction time to 20min, adjust The reaction temperature is 70°C, add 0.02g of sodium hydroxide, 7g of urea and 3.5g of soluble starch, add 1.7g of modified hydroxy silicone oil and 0.016g of sulfuric acid as a pH regulator after 15 minutes, and react at 70°C for 60 minutes, and the reaction is completed to obtain Modified urea-formaldehyde resin product UF1 with a solid content of 48.8%.

example 2

[0020] Under full stirring, weigh 40g of 37% formaldehyde solution, put it into a four-neck flask with reflux condensation, add 0.1g of catalyst ammonia water and 8g of urea, raise the temperature to 55°C and control the reaction time to 30min, add 5g of urea, adjust Temperature to 85°C and maintain the reaction time for 90min, add 1.4g of glycerin, then add 0.02g of acidic pH regulator ammonium chloride, control the reaction temperature to 95°C, the reaction time is 20min, adjust the reaction temperature to 70°C, add hydroxide Sodium 0.02g, urea 7g and soluble starch 2.6g, after 15min, add modified hydroxy silicone oil 1.7g and pH adjuster hydrochloric acid 0.033g, react at 70°C for 60min, the reaction is over, and the modified urea-formaldehyde with a solid content of 45.8% is obtained Resin product UF2.

example 3

[0022] Under full stirring, weigh 90g of 37% formaldehyde aqueous solution and 0.035g of catalyst sodium hydroxide, add them into a four-neck flask with reflux condensation, add 19.5g of urea after the sodium hydroxide is completely dissolved, raise the temperature to 60°C and control The reaction time is 30min, add 12g of urea, adjust the temperature to 85°C and maintain the reaction time for 90min, add 2.52g of glycerin, and then add 0.045g of catalyst ammonium chloride, control the reaction temperature to about 90°C, and the reaction time to 30min, adjust the reaction The temperature is 75°C, add 0.045g of sodium hydroxide, 16.5g of urea and 6.3g of soluble starch, add 4.2g of modified hydroxy silicone oil and 0.16g of pH regulator sulfuric acid after 15 minutes, and react at 75°C for 30 minutes, and the reaction is completed to obtain The modified urea-formaldehyde resin product UF3 with a solid content of 47.4%.

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Abstract

The invention discloses a method for preparing modified urea resin for coating abrasive tools. The method comprises the following steps of: adding formaldehyde at one time is a stoichiometric ratio, regulating the pH to be 7.5-10.0, adding the first batch of urea, heating to the temperature of between 50 and 80DEG C, controlling the reaction time to be 30-90 minutes, adding the second batch of urea, heating to the temperature of between 70 and 100DEG C, controlling the reaction time to be 30-90 minutes, adding a modifier of glycerol, regulating the pH to be 4.0-6.5, and reacting at the temperature of between 80 and 100DEG C for 10 to 60 minutes; and regulating the pH to be 7.0-10.0, keeping the temperature of between 69 and 90 DEG C, adding the third batch of urea and a modifier of soluble starch, and reacting for 10 to 60 minutes by keeping the temperature, adding modified hydroxy silicone oil, controlling the pH to be 7.0-9.0, reacting for 30 to 90 minutes, and finishing the reaction to obtain the urea resin for coating the abrasive tools, which is low in cost, stable in storage, and good in heat resistance and bonding strength.

Description

technical field [0001] The invention relates to a modified preparation technology of urea-formaldehyde resin, in particular to a preparation method for modifying urea-formaldehyde resin by using soluble starch, glycerin and hydroxyl silicone oil. The modified urea-formaldehyde resin has the characteristics of low cost, stable storage, good heat resistance and high bonding strength. Background technique [0002] At present, urea-formaldehyde resin (UF) glue is a kind of adhesive widely used in industries such as coated abrasives, paper bonding, bamboo and wood processing. In recent years, people's demand for environmentally friendly and high-performance adhesives is increasing, and ordinary UF resin adhesives are mostly polymers containing free formaldehyde monomers. In the process of production and practical application, These toxic gases, mainly formaldehyde monomers, will be released slowly, irritating the eyes and respiratory tract, and causing dermatitis, liver lesions,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G12/40C09J161/32
Inventor 胡应模朱建华杨雪刘洋
Owner 胡应模
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