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.
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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
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Example 3
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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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