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A kind of water retaining agent and its preparation method and application

A technology of water-retaining agent and cross-linking agent, applied in application, chemical instruments and methods, organic fertilizers, etc., can solve the problems of high cost, slow water absorption rate, poor strength, etc., and achieve low cost, fast water absorption rate, and salt and alkali resistance. good performance

Active Publication Date: 2017-03-29
YUNNAN LYUSHENG MEIDI LANDSCAPE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the processing technology of acrylic water retaining agent is relatively simple, it has high water absorption rate and good salt resistance, but its strength is poor, water absorption rate is slow, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh 1.8Kg N, N-dimethylacrylamide, 0.2Kg methyl methacrylate into a reactor equipped with 4.0Kg water, drop 2.0g Bis crosslinking agent and 2.0g photoinitiator Irgacure2959, after stirring for 40min, Control the temperature at 25°C, and irradiate with a 365nm ultraviolet light source for 2 minutes. The reaction is completed, and the reaction product is set aside.

[0031] Weigh 20.0Kg of calcium hydrogen phosphate, put it into a reactor with 100.0Kg of water, add 100.0g of Synthro-pon DAP-10 phosphate, turn on the shearing machine and stir for 60min, and wet and disperse the calcium hydrogen phosphate. The product is ready for use.

[0032] Weigh 100.0Kg polyacrylic acid sodium salt (polymer water-absorbent resin SA60N), and add the above two spare products into an ultrasonic homogenizer at the same time, adjust the frequency to 20KHz, and homogenize for 30 minutes to obtain a ternary system mixture;

[0033] Start the twin-screw polymerization reactor, set the polym...

Embodiment 2

[0036] Weigh 1.4Kg N,N-dimethylacrylamide, 0.6Kg methyl methacrylate into a reactor equipped with 4.0Kg water, drop 4.0g Bis crosslinking agent and 4.0g photoinitiator Irgacure2959, and stir for 40min, Control the temperature at 25°C, and irradiate with a 365nm ultraviolet light source for 2 minutes. The reaction is completed without post-reaction treatment, and the reaction product is ready for use.

[0037]Weigh 20.0Kg of calcium hydrogen phosphate, put it into a reactor with 100.0Kg of water, add 100.0g of Synthro-pon DAP-10 phosphate, turn on the shearing machine and stir for 60min, and wet and disperse the calcium hydrogen phosphate. The product is ready for use.

[0038] Weigh 100.0Kg polyacrylic acid sodium salt (polymer water-absorbent resin SA60N), and add the above two spare products into an ultrasonic homogenizer at the same time, adjust the frequency to 20KHz, and homogenize for 30 minutes to obtain a ternary system mixture;

[0039] Start the twin-screw polymeriz...

Embodiment 3

[0041] Weigh 2.6Kg N,N-dimethylacrylamide, 0.4Kg methyl methacrylate into a reactor equipped with 6.0Kg water, drop 4.0g Bis crosslinking agent and 6.0g photoinitiator Irgacure2959, after stirring for 40min, Control the temperature at 40°C, irradiate with a 365nm ultraviolet light source for 3 minutes, and end the reaction, and the reaction product is set aside.

[0042] Weigh 30.0Kg of calcium hydrogen phosphate, put it into a reactor with 150.0Kg of water, add 200.0g of Synthro-pon DAP-10 phosphate, turn on the shearing machine and stir for 90min, and wet and disperse calcium hydrogen phosphate. The product is ready for use.

[0043] Weigh 100.0Kg of polyacrylic acid sodium salt (polymer water-absorbent resin SA60N), add the above two spare products into an ultrasonic homogenizer at the same time, adjust the frequency to 33KHz, and homogenize for 60 minutes to obtain a ternary system mixture;

[0044] Start the twin-screw polymerization reactor, set the polymerization react...

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Abstract

The invention discloses a water-retaining agent, and a preparation method therefor and application thereof. The water-retaining agent comprises the following components: 1-50 parts of free radical polymerization reactant of N,N-dimethylacrylamide and methyl methacrylate, 5-50 parts of calcium hydrophosphate, and 80-120 parts of sodium polyacrylate. The preparation method of the water-retaining agent comprises the following steps: step one, carrying out a polymerization reaction on the N,N-dimethylacrylamide and methyl methacrylate under the effects of a cross-linking agent and a photoinitiator to obtain a polymer; and step two, after the calcium hydrophosphate is modified, carrying out ultrasonic concussion on the modified calcium hydrophosphate with the polymer and the sodium polyacrylate, heating, stirring, drying and crushing to obtain the water-retaining agent. The water-retaining agent is high in water absorption, high in strength, high in water absorption rate, good in saline-alkaline resistance, long in water-retaining time, good in temperature sensitivity, good in stability and low in cost, and is beneficial for popularization and application. The preparation method is short in process, intermediate steps of an experiment do not need postprocessing, and the process is environmentally-friendly and free of pollution.

Description

technical field [0001] The invention belongs to the technical field of water-retaining agents, and in particular relates to a water-retaining agent and its preparation method and application. Background technique [0002] Water-retaining agent is a high-molecular polymer with super-high water-absorbing and water-retaining capacity made of strong water-absorbing resin. Salt water, and has the function of repeatedly absorbing water. When water exists, the water retaining agent can quickly absorb and store water, and when water is scarce, it can release water for crops to absorb and utilize. [0003] In recent years, due to drought, water shortage, abnormal climate and labor shortage, etc., water-retaining agents have been widely used in many technical fields, especially in agriculture, forestry, soil water conservation, and landscaping. application prospects. [0004] The existing water-retaining agents mainly include starch, cellulose and acrylic acid according to the sour...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/02C08L33/24C08K9/04C08K3/32C08F220/54C08F220/14C09K17/40
Inventor 杨亦梅和跃生
Owner YUNNAN LYUSHENG MEIDI LANDSCAPE CO LTD
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