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A kind of preparation method of low-formaldehyde urea-formaldehyde resin containing modified attapulgite

A technology of modifying attapulgite and urea-formaldehyde resin, which is applied in the direction of aldehyde/ketone condensation polymer adhesives, adhesive types, adhesives, etc., which can solve the problems of polluting the living environment and endangering human health, and achieve the purpose of inhibiting release The quantity and method are unique and novel, and the effect of viscosity improvement

Inactive Publication Date: 2017-10-24
南京青禾环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main technical problem to be solved by the present invention is to provide a low-formaldehyde urea-formaldehyde resin containing modified attapulgite for the current problem that urea-formaldehyde resin will release formaldehyde during use and production, which will seriously pollute people's living environment and endanger human health. A preparation method, the method controls the reaction conditions and the amount added during the condensation reaction of formaldehyde and urea, adds modified attapulgite during the second conditional raw material operation process, and adds a small amount of auxiliary raw materials to prepare a high-performance low-formaldehyde urea-formaldehyde resin

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0026] The preparation method of described modified attapulgite powder is:

[0027] (1) Take attapulgite and put it in an oven for 30-40 minutes, set the temperature at 80-90°C, and then put it into a pulverizer to crush it into 150-170 mesh particles;

[0028] (2) Put the above-prepared particles into a container, add water to submerge the particles for 5-8cm, use a sulfuric acid solution with a mass fraction of 20%, adjust the pH to 4-5, and set the temperature to 50-60°C , stirring for 1.5 to 2.5 hours;

[0029] (3) Add sodium hydroxide solution with a mass fraction of 30% to the above turbid liquid, adjust the pH to 5.5-6, then take diethanolamine and formamide, and the mass ratio of diethanolamine, formamide and particulate matter is 1:1 : 4, put into container, at 21000~23000Hz, temperature is 60~70 ℃, stirs 20~30min, filters;

[0030] (4) Cool the filtrate obtained above to 28-35°C, put it into a mill and grind it into 200-230 mesh particles.

example 1

[0032] First, take 200g of formaldehyde and 100g of urea, put them into a reaction vessel, stir evenly, heat to 40°C, then use 40% sodium hydroxide solution to adjust the pH to 8.5, continue heating to 60°C, keep the temperature, and stir for 1h Then after the above-mentioned reaction is completed, add 126g formaldehyde and 84g urea wherein, then add the methylcellulose of 3.912g wherein, add the methenamine of 0.652g, and the modified attapulgite powder of 19.56g, use Hydrochloric acid solution with a mass fraction of 60%, adjust the pH to 5, continue heating to 80°C, keep the temperature, and stir for 2 hours; then after the above reaction is completed, add 47.14g of formaldehyde and 42.86g of urea, and add 4.48g of Modified attapulgite powder, stir and heat to 90°C, keep the temperature for 40min; finally, after the above reaction is completed, quickly cool down at a rate of 4°C / min, when the temperature drops to 50°C, add 11.19g of melamine to it, keep stirring 20 minutes,...

example 2

[0035]First take 300g of formaldehyde and 150g of urea, put them into a reaction vessel, stir evenly, heat to 43°C, then use 40% sodium hydroxide solution to adjust the pH to 9, continue heating to 65°C, keep the temperature, and stir the reaction 1.5h; then after the above reaction is completed, add 202.5g of formaldehyde and 135g of urea to it, then add 10.05g of methylcellulose, add 2.01g of urotropine, and add 35.175g of modified attapulgite Soil powder, use a hydrochloric acid solution with a mass fraction of 60%, adjust the pH to 5.5, continue heating to 83°C, keep the temperature, and stir for 3 hours; then after the above reaction is completed, add 82.5g of formaldehyde and 75g of urea, and add 7.02g of modified attapulgite powder, stirred and heated to 93°C, and kept at the temperature for 45min; finally, after the above reaction was completed, the temperature was rapidly lowered at a rate of 4°C / min, and when the temperature was lowered to 55°C, 23.4g of melamine was ...

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Abstract

The invention relates to a method for preparing low-formaldehyde urea-formaldehyde resin containing modified attapulgite, and belongs to the technical field of resin production. In the present invention, by controlling the reaction conditions and the addition amount during the condensation reaction process of formaldehyde and urea, adding modified attapulgite and a small amount of auxiliary raw materials in the second conditional raw material operation process, thereby preparing high-performance low-formaldehyde urea-formaldehyde resin. This example proves that the method of the present invention is unique and novel. In the wood preparation process, 0.8 to 1.3 g of urea-formaldehyde resin is added as an adhesive in every 60 to 100 g of wood. After 1 to 2 days, check the results of the testing equipment, so that the formaldehyde content released by the urea-formaldehyde resin is as low as 0.3mg, and in the process of production and use, there is no harm to people's living environment and health.

Description

technical field [0001] The invention relates to a method for preparing low-formaldehyde urea-formaldehyde resin containing modified attapulgite, and belongs to the technical field of resin production. Background technique [0002] At present, my country's wood adhesives are still mainly based on traditional phenolic, urea-formaldehyde, and melamine-formaldehyde resins. Urea-formaldehyde resin is cheap, easy to manufacture, and has excellent performance. It is widely used in the cloth base treatment of water-resistant sandpaper, wood sand, abrasive cloth and abrasive belt in coated abrasive tools. However, there is a problem of free formaldehyde release in the production and use of urea-formaldehyde resin, which seriously pollutes people's living environment and endangers people's health. [0003] Formaldehyde is a protein coagulant with high toxicity. The diffusion of free formaldehyde in the air can irritate people's eye membranes and skin. In severe cases, it can cause sy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G12/38C08L61/28C08K9/02C08K9/04C08K3/34C09J161/28
Inventor 吴细霞
Owner 南京青禾环保科技有限公司
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