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Preparation method for stable borosilicate sol with high specific surface area

A high specific surface area, sol technology, applied in chemical instruments and methods, boron compounds, addition of retention aids, etc., can solve the problems such as the failure of commercialization of boron-modified silica sol, the decrease of specific surface area, and the long trouble time. The preparation method conditions are easy to control, the storage is good, and the gelation is not easy.

Active Publication Date: 2012-07-04
HUBEI DAYA BIOLOGICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the boron-modified silica sol has a good retention and drainage effect, there are still some problems, such as boron-modified silica sol concentration operation takes a long time, the modification reaction is incomplete; the particle size of the sol particle increases with time during storage. It will gradually increase, which leads to a gradual decrease in specific surface area, and poor retention and drainage effects. These have led to the fact that boron-modified silica sol has not yet been commercialized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: with borax (Na 2 B 4 o 7 10H 2 O) 8.0g dissolved in 1000ml SiO 2 In the water glass (modulus 3.2) that mass percent composition is 6%, the solution obtained passes through 732 # Strongly acidic cation exchange resin column (H + type) to remove metal ions to obtain 1240ml of dilute borosilicate, with a pH of 2.14; slowly add dilute borosilicate to 60ml of 1.5M NaOH solution under stirring to obtain a borosilicate sol with a pH of 8.97, and then stir at 50°C React for 1h, then cool to room temperature, and then use 732 # Strongly acidic cation exchange resin (H + type) to a pH of 7.2, remove the resin by filtration and add 4% cetyltrimethylammonium hydroxide aqueous solution under stirring to adjust the pH of the borosilicate sol to be 9.46, and dilute the borosilicate sol with deionized water for 1 times and then ultrafiltration purification and concentration to SiO 2 The mass percentage is 16.5%, then add 4ml of 1% sodium alginate aqueous solution,...

Embodiment 2

[0023] Embodiment 2: Boric acid 1.15g is dissolved in 720ml SiO 2 Mass percent composition is in 3% water glass (modulus 3.6), gained solution directly and strongly acidic cation exchange resin (H + type) mixing and stirring treatment to remove metal ions so that the pH value of the solution is 1.72, quickly filter off the resin, and slowly add the obtained dilute borosilicate to 90ml SiO 2 A borosilicate sol with a pH value of 8.75 was obtained from a mixture of 8% water glass (modulus 3.6) and 50ml 4.8% borax aqueous solution by mass percentage, then stirred and reacted at 65°C for 0.5h, and then cooled to room temperature , and then the resulting borosilicate sol with 732 # Strongly acidic cation exchange resin (H + type) to a pH of 7.5, quickly filtered to remove the resin, and slowly added 2M LiOH aqueous solution under stirring to adjust the pH of the borosilicate sol to 9.0, and purified the borosilicate sol by ultrafiltration and concentrated to SiO 2The mass percen...

Embodiment 3

[0024] Embodiment 3: Potassium tetraborate (K 2 O·2B 2 o 3 4H 2 O) 1.17g dissolved in 400ml SiO 2 Mass percentage composition is in 8% water glass (modulus 3.2), gained solution directly and 732 # Strongly acidic cation exchange resin (H + Type) mixing and stirring to remove metal ions so that the pH of the solution is 1.09, and quickly filter off the resin; slowly add the obtained dilute borosilicate to the mixed solution of 15ml 2M KOH solution and 60ml 4% potassium tetraborate aqueous solution under stirring A borosilicate sol with a pH value of 9.5 was obtained, and then the borosilicate sol was stirred and reacted at 25°C for 6 hours, and then the obtained borosilicate sol was treated with 732 # Strongly acidic cation exchange resin (H + type) to a pH of 8.2, quickly filtered to remove the resin, then added 2M LiOH aqueous solution with 8% triethanolamine under stirring to adjust the pH of the borosilicate sol to 9.7, diluted the borosilicate sol by 2 times, purifie...

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Abstract

The invention discloses a preparation method for a stable borosilicate sol with a high specific surface area. The preparation method comprises the following steps of: removing cation from mixed solution of water glass and a boron salt by using a strongly acidic cation exchange resin; and obtaining the stable borosilicate sol with the high specific surface area by alkalizing, curing, stabilizing, purifying, concentrating, protecting and stabilizing, wherein the specific surface area is up to 900 to 1,400 m<2> / g; the particle size of the sol is of between 2.0 and 3.0nm; and an S value is less than 30 percent. The preparation method of the invention has the characteristics of easy control and high repeatability and is suitable for industrialized production; and the obtained silica sol has the characteristics of extremely high stability, not easy gelatinization and high storability, can serve as a retention and filtration aid in a paper-making process, and also can be widely used in projects or departments such as petrochemical industry, light textile, environmental protection and the like.

Description

technical field [0001] The invention relates to a method for preparing borosilicate sol, in particular to a method for preparing stable high specific surface area borosilicate sol by using water glass and boron salt as raw materials. Background technique [0002] Silica sol refers to the dispersion system of silica in water, which can form a binary particle retention and drainage system (Compozil system) with cationic starch and is used as an excellent retention and drainage aid in the paper industry . As a retention and drainage aid, it can significantly improve the retention rate of fine fibers and paper evenness, as well as improve the drainage of the wire section and the dewatering speed of the press section. Since the development of the Compozil system in the 1980s, due to its good retention and drainage effect and suitable for high-speed paper machines, the use of silica sol in papermaking has developed rapidly. At present, 60% of the world's paper machines use silica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H21/10C01B35/00
Inventor 杨建红徐振明陈学俊徐丹
Owner HUBEI DAYA BIOLOGICAL TECH CO LTD
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