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Hydrogel formulation polymerized at normal temperature and preparation method

A production method and hydrogel technology, applied in the chemical industry, can solve the problems of high production difficulty and high production cost, no discussion of polymerization formula and production method, etc., so as to reduce production process requirements and costs, and reduce acid-base concentration , the effect of facilitating miniaturization

Inactive Publication Date: 2010-01-27
李金兴
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Problems solved by technology

These professional books and patent documents do not discuss the polymerization of the polymerization liquid at normal temperature within 40 degrees, and do not discuss the formula and production method of polymerization in plastic bags and plastic boxes of equipment such as non-vacuum nitrogen-filled polymerization tanks. The production of polyacrylic acid hydrogel is limited to production in large and medium-sized factories, and the production difficulty and production cost remain high

Method used

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  • Hydrogel formulation polymerized at normal temperature and preparation method

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Embodiment 1

[0009] Example 1, 100g sodium hydroxide and 900ml water are dissolved for subsequent use, and 1000ml of acrylic acid aqueous solution 1000ml is stirred and neutralized, and the maximum temperature of the neutralized solution is recorded as 33 degrees, and then the prepared additive is added (wherein the initiator is put at the end ), and finally pour the liquid to be polymerized into the plastic bag, exhaust and seal it and let it stand for polymerization. The polymerization time can be adjusted in the range of 2-120 minutes by adjusting the ratio of additives, and the polymerization temperature is 28-30 degrees, depending on the needs of the product. Certainly. The polymerized hydrogel is crystal clear, elastic, non-dripping, non-deformable, and will not dissolve when scalded with boiling water or heated in a microwave oven, which simplifies the production process of the hydrogel bag and improves the quality and use effect of the hydrogel bag. After the polymerized hydrogel i...

Embodiment 2

[0010] Example 2, 100g of sodium hydroxide and 1100ml of water were dissolved for later use, stirred and neutralized with 1200ml of 9% acrylic acid aqueous solution, and the highest temperature of the neutralized solution was measured to be 29 degrees, and it could also be cooled naturally. Then add the prepared additives, and finally pour the liquid to be polymerized into ceramic bowls and let it stand for polymerization. The polymerization temperature is within 25 degrees. After the polymerized hydrogel is dehydrated and dried, it is pulverized into a water-absorbing resin with a water absorption rate of 80 times.

Embodiment 3

[0011] Example 3, 100kg of sodium hydroxide and 600kl of water are dissolved for subsequent use, and neutralized with 700kl of 15% acrylic acid aqueous solution by stirring. The highest temperature of the neutralized solution is measured to be 40 degrees, and it can also be cooled naturally. Then add the prepared additives, and finally pour the liquid to be polymerized into plastic trays and let it stand for polymerization. The polymerization temperature is within 37 degrees. After the polymerized hydrogel is dehydrated and dried, it is pulverized into a water-absorbing resin with a water absorption rate of 160 times.

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Abstract

The invention relates to a hydrogel formulation polymerized at normal temperature and a preparation method thereof. The hydrogel formulation is characterized in that the concentration of acrylic acid aqueous solution and sodium hydroxide aqueous solution in the formulation is between 8 and 18.5 percent, the ratio of base to acid is between 2:1 and 1:2, and a specific additive is matched into the formulation; and in the preparation method, acid-base neutralization and polymerization are performed at the normal temperature (within 50 DEG C), and solution to be polymerized is polymerized at the normal temperature in a simple plastic bag or a plastic box, or is polymerized into hydrogel at the normal temperature in a non-vacuum nitrogen-filled barrel, tank or water pool. The formulation and the method obviously reduce the production cost and are convenient for the small-scale production and the domestic workshop type production of the hydrogel.

Description

Technical field: [0001] The invention discloses a hydrogel formula capable of polymerizing at normal temperature and a preparation method thereof, which belong to the technical field of chemical industry. Background technique: [0002] The polyacrylic acid hydrogel production process of the prior art is very complex and extremely demanding, as discussed in the first edition of Chemical Industry Press "High Water Absorption and High Oil Resin" p161-181 pages in May 2005 to the polyacrylic acid hydrogel production process It can be known from the above: the production of polyacrylic acid hydrogel must have cooling and cooling equipment for alkali hydrolysis, acid-base neutralization, stirring equipment, vacuum reactor for filling nitrogen and driving oxygen, constant temperature polymerization equipment, etc., and the polymerization temperature is at Above 80 degrees, the polymerization time should be 2-8 hours. As described in CN93118705.2 "Manufacturing Method and Equipment...

Claims

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Application Information

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IPC IPC(8): C08F120/06
Inventor 李金兴
Owner 李金兴
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