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Method for preparing partially crosslinked hydroexpansivity acrylate-acrylic acid copolymer

An acrylate and cross-linked technology, which is applied in the field of preparation of partially cross-linked water-swellable acrylate-acrylic acid copolymers, can solve the problems of large investment, high operation requirements and unstable product quality.

Inactive Publication Date: 2004-11-10
英德市安信保水有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have some disadvantages, such as the initiator initiation method and the oxidation-reduction initiator initiation method require high operation requirements, complex reaction devices, strict process control, unstable product quality, and the gamma-ray irradiation initiation method has too much investment once, and the production Low efficiency, greatly restricted in actual production

Method used

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  • Method for preparing partially crosslinked hydroexpansivity acrylate-acrylic acid copolymer
  • Method for preparing partially crosslinked hydroexpansivity acrylate-acrylic acid copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A preparation method of a partially cross-linked water-swellable sodium acrylate-acrylic acid copolymer: Weigh 72 g of acrylic acid and put it into a container with stirring, a thermometer, and an ice-water bath. Weigh 90 g of 30% sodium hydroxide solution, add 45 g of water to make the sodium hydroxide solution 20%, and transfer it to the dropping funnel. Start stirring, slowly add sodium hydroxide solution dropwise, control the neutralization reaction temperature below 30°C, add crosslinking agent N, N'-methylenebisacrylamide 0.002g, photoinitiator benzoin after completion of neutralization reaction Isopropyl ether 0.002g. Nitrogen for 45 minutes, put into a transparent container, and seal it for later use.

[0021] Put the liquid in the transparent container under the ultraviolet lamp, adjust the distance so that the light intensity of the ultraviolet lamp is 5000μw / cm 2 , irradiated for 5h, the polymerization reaction was completed, and a copolymer gel was obtaine...

Embodiment 2-9

[0025] Implementation steps are the same as in Example 1, and the ratio of each component, light conditions, and performance are shown in Table 1

[0026] implement

Example 2

implement

Example 3

implement

Example 4

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Example 5

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Example 6

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Example 7

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Example 8

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Example 9

Group

Minute

acrylic

34.0

36.5

31.7

28.6

35.6

28.6

25.5

23.8

sodium hydroxide

9.4

12.7

15.4

11.9

14.9

11.9

10.6

9.9

Deionized water

56.6

50.8

52.9

59.5

49.5

59.5

63.8

66.2

cross-linking

agent

quantity

0

0.001

0.002

0.002

0.002

0.005

0.01

0.02

type

a

b

c

d

e

f

a+b

light guide

Hairspray

quantity ...

Embodiment 10

[0035] A preparation method of a partially cross-linked water-swellable potassium acrylate-acrylic acid copolymer: Weigh 72 g of acrylic acid, and put it into a three-necked flask equipped with stirring, a thermometer, and an ice-water bath. Weigh 42 g of potassium hydroxide, add 168 g of water to make the potassium hydroxide to a content of 20%, and transfer it to the dropping funnel. Start stirring, slowly add potassium hydroxide solution dropwise, control the neutralization reaction temperature to ≤30°C, and add 0.002g of N,N'-methylenebisacrylamide and 0.002g of benzoin isopropyl ether after the neutralization reaction is completed. Nitrogen flow for 45 minutes, put into plastic bags for later use.

[0036] Put the bagged material liquid under the ultraviolet lamp, adjust the distance so that the light intensity of the ultraviolet lamp is 5000μw / cm 2 , irradiated for 5h, the polymerization reaction was completed, and a copolymer gel was obtained.

[0037] The gel is shre...

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Abstract

The invention relates to the process for preparing a partial cross bonding type water expanding acrylate- acrylic acid copolymer, characterized in that ultraviolet light is applied to initiate monomer polymerization, and the raw materials and their proportion are, 23.7-36.5 wt. portions of acrylic acid, 9.4-21.2 wt. portions of alkali metal hydroxide, and 44.1-66.2 wt. portions of water. The preparation method comprises the steps of, (1) charging in acrylic acid, (2) dropping alkali metal hydroxide into acrylic acid, controlling the temperature below 30 deg. C, (3) letting nitrogen into the feed liquid, (4) light lamination for 3-24 hours, subjecting material to polymerization reaction so as to obtain polymer gel, (5) subjecting the gel to granulation, drying, and disintegrating.

Description

technical field [0001] The invention relates to a preparation method of a partially cross-linked water-swellable acrylate-acrylic acid copolymer. Background technique [0002] Partially cross-linked water-swellable acrylate-acrylic acid copolymer is used in the manufacture of water-absorbing materials, water-retaining materials, and water-blocking agents for cables. At present, the preparation methods of partially cross-linked water-swellable acrylate-acrylic acid copolymers include: 1. Initiator initiation method, 2. Oxidation-reduction initiator initiation method, 3. γ-ray irradiation initiation method, 4. Microwave initiation method law etc. The prepared copolymer gel undergoes steps of granulation, drying, crushing and the like to obtain water-swellable copolymer pellets. At present, the initiator initiation method and the oxidation-reduction initiator initiation method have been successfully applied in large-scale industrial production, and the γ-ray irradiation initi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F2/48C08F220/06
Inventor 余孟成
Owner 英德市安信保水有限公司
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