Liquid water-retaining agent and preparation method thereof

Abstract

The invention relates to a liquid water-retaining agent and a preparation method thereof. The liquid water-retaining agent comprises, by weight, 200-220 parts of acrylic acid, 8-12 parts of polymerization inhibitor, 1-9 parts of initiator, 3-12 parts of crosslinking agents, 60-70 parts of modified organosilicon resin and 400-450 parts of water, wherein the crosslinking agents are N, N-dimethyl acrylamide and N, N-methylene bisacrylamide. After the liquid water-retaining agent prepared by the method is sprayed to soil, the liquid water-retaining agent permeates downwards, and absorbs water andquickly swells to form a water-retaining layer, thereby having good water-retaining performance.

Description

technical field

[0001] The invention relates to the field of agricultural technology, more specifically, it relates to a liquid water-retaining agent and a preparation method thereof. Background technique

[0002] Water-retaining agent, also known as water-absorbing agent and soil humectant, is a polymer material with special functions developed at home and abroad in recent years. Because of its good water absorption and high water retention without dehydration, it is widely used in agriculture and forestry.

[0003] At present, the water retaining agents on the market are usually solid water retaining agents. Among them, the main components of the solid water retaining agent are polyacrylic acid and sodium polyacrylate, and a small amount of bentonite or attapulgite is used as the water retaining agent to increase the water retaining effect of the water retaining agent. An anti-seepage and water-retaining agent disclosed in the patent application document with the applicat...

Examples

Embodiment 1

[0025] S1: Add 210kg of acrylic acid to 425kg of water and mix evenly, then add sodium hydroxide to the reaction system to adjust the pH of the reaction system to 5.5, wherein the concentration of acrylic acid is 0.6g / L, and the concentration of sodium hydroxide is 0.7g / L;

[0026] S2: Raise the temperature of the reaction system to 63°C, add 5kg of sodium persulfate, 2kg of N,N-dimethylacrylamide, and 4kg of N,N-methylenebisacrylamide to the reaction system, and the reaction time is 70min. After the reaction, add hydrochloric acid to adjust the pH of the reaction system to 7.1 in the reaction system, wherein the concentration of hydrochloric acid is 0.2g / L;

[0027] S3: Raise the temperature of the reaction system to 72° C., add 10 kg of sodium sulfate and 65 kg of modified silicone resin to the reaction system, and react for 30 minutes. After the reaction is completed, a liquid water retaining agent is obtained.

Embodiment 2

[0029] S1: Add 200 kg of acrylic acid to 400 kg of water and mix evenly, then add sodium hydroxide to the reaction system to adjust the pH of the reaction system to 5.1, wherein the concentration of acrylic acid is 0.7 g / L, and the concentration of sodium hydroxide is 0.9 g / L;

[0030] S2: Raise the temperature of the reaction system to 60°C, add 5kg of potassium disulfate, 3kg of N,N-dimethylacrylamide, and 2kg of N,N-methylenebisacrylamide to the reaction system, and the reaction time is 60min. After the reaction, add hydrochloric acid to the reaction system to adjust the pH of the reaction system to 6.8, wherein the concentration of hydrochloric acid is 0.1g / L;

[0031] S3: Raise the temperature of the reaction system to 74°C again, add 6 kg of sodium sulfide, 6 kg of sodium sulfate, and 60 kg of modified silicone resin to the reaction system, and react for 30 minutes. After the reaction is completed, a liquid water retaining agent is obtained.

Embodiment 3

[0033] S1: Add 220 kg of acrylic acid to 400 kg of water and mix evenly, then add sodium hydroxide to the reaction system to adjust the pH of the reaction system to 5.1, wherein the concentration of acrylic acid is 0.7 g / L, and the concentration of sodium hydroxide is 0.5 g / L;

[0034] S2: Raise the temperature of the reaction system to 66°C, add 9kg of hydrogen peroxide, 3kg of N,N-dimethylacrylamide, and 2kg of N,N-methylenebisacrylamide to the reaction system, and the reaction time is 80min. After the reaction, add hydrochloric acid to the reaction system to adjust the pH of the reaction system to 6.8, wherein the concentration of hydrochloric acid is 0.1g / L;

[0035] S3: Raise the temperature of the reaction system to 74° C., add 8 kg of sodium sulfate and 70 kg of modified silicone resin to the reaction system, and react for 40 minutes. After the reaction is completed, a liquid water retaining agent is obtained.

technical field

[0001] The invention relates to the field of agricultural technology, more specifically, it relates to a liquid water-retaining agent and a preparation method thereof. Background technique

[0002] Water-retaining agent, also known as water-absorbing agent and soil humectant, is a polymer material with special functions developed at home and abroad in recent years. Because of its good water absorption and high water retention without dehydration, it is widely used in agriculture and forestry.

[0003] At present, the water retaining agents on the market are usually solid water retaining agents. Among them, the main components of the solid water retaining agent are polyacrylic acid and sodium polyacrylate, and a small amount of bentonite or attapulgite is used as the water retaining agent to increase the water retaining effect of the water retaining agent. An anti-seepage and water-retaining agent disclosed in the patent application document with the applicat...

Examples

Embodiment 1

[0025] S1: Add 210kg of acrylic acid to 425kg of water and mix evenly, then add sodium hydroxide to the reaction system to adjust the pH of the reaction system to 5.5, wherein the concentration of acrylic acid is 0.6g / L, and the concentration of sodium hydroxide is 0.7g / L;

[0026] S2: Raise the temperature of the reaction system to 63°C, add 5kg of sodium persulfate, 2kg of N,N-dimethylacrylamide, and 4kg of N,N-methylenebisacrylamide to the reaction system, and the reaction time is 70min. After the reaction, add hydrochloric acid to adjust the pH of the reaction system to 7.1 in the reaction system, wherein the concentration of hydrochloric acid is 0.2g / L;

[0027] S3: Raise the temperature of the reaction system to 72° C., add 10 kg of sodium sulfate and 65 kg of modified silicone resin to the reaction system, and react for 30 minutes. After the reaction is completed, a liquid water retaining agent is obtained.

Embodiment 2

[0029] S1: Add 200 kg of acrylic acid to 400 kg of water and mix evenly, then add sodium hydroxide to the reaction system to adjust the pH of the reaction system to 5.1, wherein the concentration of acrylic acid is 0.7 g / L, and the concentration of sodium hydroxide is 0.9 g / L;

[0030] S2: Raise the temperature of the reaction system to 60°C, add 5kg of potassium disulfate, 3kg of N,N-dimethylacrylamide, and 2kg of N,N-methylenebisacrylamide to the reaction system, and the reaction time is 60min. After the reaction, add hydrochloric acid to the reaction system to adjust the pH of the reaction system to 6.8, wherein the concentration of hydrochloric acid is 0.1g / L;

[0031] S3: Raise the temperature of the reaction system to 74°C again, add 6 kg of sodium sulfide, 6 kg of sodium sulfate, and 60 kg of modified silicone resin to the reaction system, and react for 30 minutes. After the reaction is completed, a liquid water retaining agent is obtained.

Embodiment 3

[0033] S1: Add 220 kg of acrylic acid to 400 kg of water and mix evenly, then add sodium hydroxide to the reaction system to adjust the pH of the reaction system to 5.1, wherein the concentration of acrylic acid is 0.7 g / L, and the concentration of sodium hydroxide is 0.5 g / L;

[0034] S2: Raise the temperature of the reaction system to 66°C, add 9kg of hydrogen peroxide, 3kg of N,N-dimethylacrylamide, and 2kg of N,N-methylenebisacrylamide to the reaction system, and the reaction time is 80min. After the reaction, add hydrochloric acid to the reaction system to adjust the pH of the reaction system to 6.8, wherein the concentration of hydrochloric acid is 0.1g / L;

[0035] S3: Raise the temperature of the reaction system to 74° C., add 8 kg of sodium sulfate and 70 kg of modified silicone resin to the reaction system, and react for 40 minutes. After the reaction is completed, a liquid water retaining agent is obtained.

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