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Method of preparing polyacrylate super absorbent resin at high temperature

A technology of super absorbent resin and polyacrylate, which is applied in the field of preparation of polyacrylate super absorbent resin, can solve the problems affecting the continuity of on-site production, increase production cost, consume large amounts of nitrogen, etc., and achieve good diffusion performance, The effect of saving production costs and ensuring continuity

Inactive Publication Date: 2018-05-04
JIANGSU SAILBOAT PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The neutralization reaction of acrylic acid and sodium hydroxide solution is a violent exothermic reaction, and the temperature of the neutralizing solution can reach up to about 90°C. If the initiator is added to react at a lower temperature, it is necessary to turn on the ice machine to cool down, so that not only It affects the continuity of on-site production and wastes a lot of energy. In addition, nitrogen and oxygen removal need to consume a lot of nitrogen, which also increases production costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1, a method for preparing polyacrylate superabsorbent resin at high temperature, the steps are as follows:

[0020] (1) Dilute acrylic acid with water, then add 50% sodium hydroxide solution for neutralization reaction to obtain a neutralization solution, the neutralization degree of the neutralization solution is 50%-80%, and the mass of acrylic acid accounts for the total amount of the neutralization solution 20%-38% of the mass, when the temperature of the neutralizing solution is 50°C-90°C, add crosslinking agent and auxiliary agent for polymerization reaction, the polymerization reaction time is 1min-15min, and the final temperature can reach 100°C-160 °C, a block gel is obtained, wherein the mass of the crosslinking agent is 0.03%-0.60% of the total amount of acrylic acid, and the mass of the auxiliary agent is 0.0015%-0.35% of the total amount of acrylic acid;

[0021] (2) Add the block gel to the rubber cutting granulator for cutting and granulating, ...

Embodiment 2

[0026] Embodiment 2, a method for preparing polyacrylate superabsorbent resin at high temperature, the steps are as follows:

[0027] (1) After diluting 200g of high-purity acrylic acid with 380g of water, add 150g of 50% sodium hydroxide for neutralization reaction to obtain a neutralization solution; when the temperature of the neutralization solution is 50°C-90°C, add 0.44g of polyethylene glycol 200, 0.2g of sodium thiosulfate, and 0.6g of sodium persulfate are used for polymerization reaction. The polymerization reaction time is 5 minutes. The final temperature of the reaction can reach 100°C-160°C to obtain a block gel;

[0028] (2) Add the block gel to the rubber cutting granulator for cutting and granulating, add 4g of sodium sulfite at the same time of cutting and granulating to remove unreacted acrylic acid, then enter the dryer and dry to a wet basis of 3 % block-shaped superabsorbent resin, the drying temperature in the dryer is 120°C, and then crushed and sieved t...

Embodiment 3

[0030] Embodiment 3, a method for preparing polyacrylate superabsorbent resin at high temperature, the steps are as follows:

[0031] (1) After diluting 220g of high-purity acrylic acid with 400g of water, add 170g of 50% sodium hydroxide for neutralization reaction to obtain a neutralization solution; when the temperature of the neutralization solution is 50°C-90°C, add 0.25g of polyethylene glycol 600, 0.25g of ethoxylated neopentyl glycol diacrylate, 0.7g of sodium persulfate, and 0.25g of sodium sulfite for polymerization reaction. The polymerization reaction time is 8 minutes, and the final temperature can reach 100°C after the reaction is complete. -160°C, block gel is obtained;

[0032](2) Add the block gel to the rubber cutting granulator for cutting and granulating, add 2g of sucrose ester and 4.5g of sodium metabisulfite at the same time of cutting and granulating, remove unreacted acrylic acid, and then enter the dryer. Dried to a block-shaped superabsorbent resin ...

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Abstract

The invention discloses a method of preparing polyacrylate super absorbent resin at a high temperature. The method comprises the following steps: adding a sodium hydroxide solution (50%) into an acrylic acid solution with a certain concentration to carry out neutralization reactions so as to obtain a neutral solution; when the temperature of the neutral solution is 50-90 DEG C, adding a crosslinking agent and other auxiliary agents into the neutral solution according to a certain ratio, carrying out reactions to obtain gel, wherein the final temperature of gelling reactions can reach 100-160 DEG C; grinding and extruding gel, drying, grinding, sieving, and finally carrying out secondary surface crosslinking to prepare the polyacrylate super absorbent resin. The heat of neutralization reactions is utilized, a crosslinking agent is added at a high temperature to carry out reactions, the energy consumption for cooling is reduced, and continuous production is guaranteed. Because the primary temperature of polymerization is high, the highest temperature of gelling reactions is high, a large amount of water is removed through evaporation, drying is promoted; the reaction time is short, the production efficiency is largely improved, the steps of nitrogen introducing and oxygen removing are not needed, and the production cost is reduced therefore.

Description

technical field [0001] The invention relates to a preparation method of polyacrylate superabsorbent resin, in particular to a method for preparing polyacrylate superabsorbent resin at high temperature. Background technique [0002] Polyacrylate superabsorbent resin is a high polymer with a certain crosslinking strength. It has strong water absorption capacity and can quickly absorb water hundreds or even thousands of times its own weight, and it will not flow out after absorption, even under a certain pressure. It can still retain moisture without being separated. It is precisely because of its excellent water absorption, water retention and good biodegradability that it is widely used in many aspects such as diapers, sanitary napkins, food preservatives, agricultural and forestry soil drought resistance and water retention agents, sand prevention and water control, etc. It is a kind of product with good market prospects The product. [0003] The existing patent applicatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08F283/06C08F220/06C08F222/20
CPCC08F220/06C08F283/06C08J3/245C08J2333/02C08J2351/08C08F222/1006C08F222/103
Inventor 王奎奎杨光杰王翔唐德荣朱富军程华王英苗
Owner JIANGSU SAILBOAT PETROCHEMICAL CO LTD
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