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Method for modifying titanium dioxide by urea-formaldehyde resin

A technology of urea-formaldehyde resin and titanium dioxide, applied in chemical instruments and methods, textiles and papermaking, papermaking, etc., can solve the problems of increasing papermaking cost, poor effect, low retention rate, etc., and achieve high retention rate and significant economic benefits. , the effect of low cost

Active Publication Date: 2021-08-13
CHONGQING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, at present, the titanium dioxide used in the domestic papermaking industry generally has low retention rate and easy foaming during the stirring process, resulting in high cost and poor effect; another defect is that the sulfuric acid method is generally used in China for titanium dioxide. Production, the color is yellowish, so it is necessary to add other whitening additives in the papermaking process to improve the whiteness, which also increases the cost of papermaking

Method used

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  • Method for modifying titanium dioxide by urea-formaldehyde resin
  • Method for modifying titanium dioxide by urea-formaldehyde resin
  • Method for modifying titanium dioxide by urea-formaldehyde resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Disperse 100g of urea-formaldehyde resin evenly in 1L of ionized water, stir for 30 minutes, and prepare 100g / L of urea-formaldehyde resin slurry. It is required that the impurity content of ionized water is low, specifically in ionized water: Ca, Mg, and Fe must be lower than 20ppm.

[0019] Add 300g of anatase titanium dioxide evenly into the prepared urea-formaldehyde resin solution, continue stirring for 30min, and then add 10g of polyvinyl alcohol for further modification.

[0020] The above slurry was put into an enamel dish, dried at 105° C., and pulverized by a grinder to obtain urea-formaldehyde resin-modified titanium dioxide specially used for papermaking.

[0021] Evenly add the above-mentioned titanium dioxide to the 10g / L wood pulp that has been uniformly dispersed by a high-speed disperser, then evenly add 100g of calcium carbonate, 100g of kaolin and additives to make paper, and test the performance of the paper after drying the wet paper .

Embodiment 2

[0023] Disperse 200g of urea-formaldehyde resin evenly in 1L of ionized water, stir for 30 minutes, and prepare 200g / L of urea-formaldehyde resin slurry. It is required that the impurity content of ionized water is low, specifically in ionized water: Ca, Mg, and Fe must be lower than 20ppm.

[0024] Add 400 g of crude uncoated rutile titanium dioxide evenly into the prepared urea-formaldehyde resin solution, continue stirring for 40 min, and then add 10 g of polyethylene glycol for further modification.

[0025] The above slurry was put into an enamel dish, dried at 105° C., and pulverized by a grinder to obtain urea-formaldehyde resin-modified titanium dioxide specially used for papermaking.

[0026] Evenly add the above-mentioned titanium dioxide to the 30g / L wood pulp that has been uniformly dispersed by a high-speed disperser, then evenly add 200g of calcium carbonate, 200g of kaolin and additives to make paper, and test the performance of the paper after drying the wet pa...

Embodiment 3

[0028] Disperse 300g of urea-formaldehyde resin evenly in 1L of ionized water, stir for 60 minutes, and prepare a 300g / L urea-formaldehyde resin slurry. It is required that the impurity content of ionized water is low, specifically in ionized water: Ca, Mg, and Fe must be lower than 20ppm.

[0029] Add 500g of anatase titanium dioxide or crude uncoated rutile titanium dioxide evenly into the prepared urea-formaldehyde resin solution, continue stirring for 50min, and then add 10g of hydroxymethyl cellulose respectively for further modification.

[0030] The above slurry was put into an enamel dish, dried at 105° C., and pulverized by a grinder to obtain urea-formaldehyde resin-modified titanium dioxide specially used for papermaking.

[0031] Evenly add the above titanium dioxide to the 40g / L wood pulp that has been uniformly dispersed by a high-speed disperser, then evenly add 300g of calcium carbonate, 100g of kaolin and additives to make paper, and test the performance of th...

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Abstract

The invention relates to a method for modifying titanium dioxide by using urea-formaldehyde resin, which belongs to the technical field of titanium dioxide modification. The method of adopting urea-formaldehyde resin of the present invention to titanium dioxide modification, comprises the following steps: (1) urea-formaldehyde resin is dispersed in ionized water, stirs, is configured into the urea-formaldehyde resin slurry liquid of 100-300g / L; (2) Add 300‑500g of crude titanium dioxide to 1L of prepared urea-formaldehyde resin slurry, continue stirring, and then add modifier; (3) Put the above slurry into an enamel plate, dry it, and then pulverize it , to obtain urea-formaldehyde resin modified titanium dioxide specially used for papermaking. The invention is scientific and reasonable in design, simple and easy to implement, and when the modified titanium dioxide is used in the papermaking industry, it has a high retention rate, is not easy to foam, is whitish in color, has low cost, and has remarkable economic benefits.

Description

technical field [0001] The invention relates to a method for modifying titanium dioxide by using urea-formaldehyde resin, which belongs to the technical field of titanium dioxide modification. Background technique [0002] China is a big paper-making country, but its share of high-end paper is not large. For a long time, it has attracted social attention for its low-end paper and poor environmental protection. In the papermaking process, fillers such as titanium dioxide, calcium carbonate, kaolin and talc are indispensable raw materials. The quality of the filler directly affects the quality and production cost of the paper, because the filler improves the whiteness, smoothness, opacity, etc. of the paper, and at the same time helps to improve printing performance and prevent printing penetration. Therefore, fillers such as titanium dioxide, calcium carbonate, kaolin and talc are required to meet high refractive index, high whiteness, low impurity content, high gloss, unif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/36C09C3/10D21H17/67D21H17/68D21H17/69
CPCC01P2006/10C09C1/3676C09C1/3692C09C3/006C09C3/10D21H17/675D21H17/68D21H17/69
Inventor 李化全邱贵宝吕学伟孙鹏
Owner CHONGQING UNIV