A kind of preparation method of starch-based water-retaining agent with high gel strength
A high-gel and water-retaining agent technology, which is applied in the field of preparation of starch-based water-retaining agents, can solve the problems of starch-based water-retaining agents such as poor retention characteristics, large liquid penetration, and limited use range, etc., to achieve strong salt resistance and gel The effect of high strength and simple preparation method
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Embodiment 1
[0020] In this example, a starch-based water-retaining agent with high gel strength was prepared according to the following steps:
[0021] a. Take 2g of wheat starch and add it to 30ml of distilled water, then gelatinize at 95°C for 0.5h to obtain gelatinized wheat starch;
[0022] b. Measure 10ml of acrylic acid, add 20ml of 10mol / L sodium hydroxide to it while stirring the acrylic acid in an ice bath, the volume ratio of acrylic acid to sodium hydroxide is 1:2; weigh 5g of maleic acid, 0.015g Add N,N'-methylenebisacrylamide and 0.035g ammonium persulfate together with sodium acrylate solution to gelatinized wheat starch to obtain a mixed solution; the mass ratio of maleic acid to acrylic acid is 1:2;
[0023] c. Stir the mixed solution at a rate of 270 r / min at 50° C. for 1 hour, so that the mixed solution is graft-copolymerized to form a copolymerized product;
[0024] d. Pour the copolymerized product into a tetrafluoroethylene plate, and dry the tetrafluoroethylene plat...
Embodiment 2
[0027] In this example, a starch-based water-retaining agent with high gel strength was prepared according to the following steps:
[0028] a. Take 2g of wheat starch and add it to 30ml of distilled water, then gelatinize at 95°C for 0.5h to obtain gelatinized wheat starch;
[0029] b. Measure 10ml of acrylic acid, add 20ml of 10mol / L sodium hydroxide to it while stirring the acrylic acid in an ice bath, the volume ratio of acrylic acid to sodium hydroxide is 1:2; weigh 5g of maleic acid, 0.030g N,N'-methylenebisacrylamide and 0.035g ammonium persulfate were added to the gelatinized wheat starch together with sodium acrylate solution to obtain a mixed solution; the mass ratio of maleic acid to acrylic acid was 1: 2;
[0030] c. Stir the mixed solution at a rate of 270 r / min at 50° C. for 1 hour, so that the mixed solution is graft-copolymerized to form a copolymerized product;
[0031] d. Pour the copolymerized product into a tetrafluoroethylene plate, and dry the tetrafluor...
Embodiment 3
[0034] In this example, a starch-based water-retaining agent with high gel strength was prepared according to the following steps:
[0035] a. Take 2g of wheat starch and add it to 30ml of distilled water, then gelatinize at 95°C for 0.5h to obtain gelatinized wheat starch;
[0036] b. Measure 10ml of acrylic acid, add 20ml of 10mol / L sodium hydroxide to it while stirring the acrylic acid in ice bath, the volume ratio of acrylic acid to sodium hydroxide is 1:2; weigh 5g of maleic acid, 0.045g N, N'-methylenebisacrylamide and 0.035g ammonium persulfate are added in the gelatinized wheat starch together with sodium acrylate solution to obtain a mixed solution; the mass ratio of maleic acid to the acrylic acid is 1:2;
[0037] c. Stir the mixed solution at a rate of 270 r / min at 50° C. for 1 hour, so that the mixed solution is graft-copolymerized to form a copolymerized product;
[0038] d. Pour the copolymerized product into a tetrafluoroethylene plate, and dry the tetrafluoro...
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