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Preparation method of polycarboxylic acid water reducer with high workability

A technology of ester polycarboxylic acid and water reducing agent, applied in the field of building materials, can solve the problems of general workability of target products, influence of copolymerization process, long reaction period, etc. the effect of shortening

Active Publication Date: 2015-12-23
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The target product of this process has general workability, and the polymerization inhibitor added in the esterification process has a greater impact on the copolymerization process, and the two-step reaction cycle is longer

Method used

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  • Preparation method of polycarboxylic acid water reducer with high workability

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Experimental program
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Effect test

Embodiment 1

[0024] (1) Step 1: In parts by mass, 100 parts of acrylic acid, 6 parts of acryloyloxyethyl phosphate, 3 parts of methacryloyloxyethylene trimethyl ammonium chloride and 50 parts of water are placed in the reaction device, Stir and dissolve, react at 25°C, put 0.8 parts of hydrogen peroxide, 0.3 parts of ferrous ammonium sulfate and tetramethylammonium chloride mixture into the reaction device in turn, add 10 parts of acrylic acid, 1.0 parts of 3-mercaptopropionic acid, 0.4 parts L-ascorbic acid and 50 parts of water were placed in the dripping device, and the dropwise addition was completed in 1.0 hour, and then the insulation was continued for 0.5 hour to obtain a block copolymer intermediate.

[0025] (2) Step 2: in parts by mass, 100 parts of polyethylene glycol monomethyl ether (MPEG-1200), 20 parts (obtained in step 1) block copolymer intermediate, 0.3 part of solid superacid ( SO 4 2- / TiO 2 / La 3+ ) into the reaction device, heated up to 90°C, stirred and evacuated...

Embodiment 2

[0027] (1) Step 1: In parts by mass, 100 parts of acrylic acid, 6 parts of acryloyloxyethyl phosphate, 3 parts of methacryloyloxyethylene trimethyl ammonium chloride and 50 parts of water are placed in the reaction device, Stir and dissolve, react at 25°C, put 0.8 parts of hydrogen peroxide, 0.3 parts of ferrous ammonium sulfate and tetramethylammonium chloride mixture into the reaction device in turn, add 10 parts of acrylic acid, 1.0 parts of 3-mercaptopropionic acid, 0.4 parts L-ascorbic acid and 50 parts of water were placed in the dripping device, and the dropwise addition was completed in 1.0 hour, and then the insulation was continued for 0.5 hour to obtain a block copolymer intermediate.

[0028] (2) Step 2: in parts by mass, 100 parts of polyethylene glycol monomethyl ether (MPEG-2200), 18 parts (obtained in step 1) block copolymer intermediate, 0.4 part of solid superacid ( SO 4 2- / TiO 2 / La 3+ ) into the reaction device, heated up to 95 ° C, stirred and vacuumi...

Embodiment 3

[0030] (1) Step 1: In parts by mass, 100 parts of acrylic acid, 10 parts of methacryloyloxyhydroxypropyl phosphate, 5 parts of methacryloyloxyethylene trimethyl ammonium chloride and 50 parts of water are placed in the reaction In the device, stir and dissolve, react at 25°C, put 1.0 parts of hydrogen peroxide, 0.3 parts of ferrous ammonium sulfate and tetramethylammonium chloride mixture into the reaction device in turn, add 10 parts of acrylic acid, 0.7 parts of 3-mercaptopropionic acid , 0.6 parts of L-ascorbic acid and 50 parts of water are placed in the dripping device, and the dropwise addition is completed in 1.0 hour, and then the insulation is continued for 0.5 hour to obtain a block copolymer intermediate.

[0031] (2) Step 2: In parts by mass, 100 parts of polyethylene glycol monomethyl ether (MPEG-600: MPEG-3000=2:1), 20 parts (obtained in step 1) of block copolymer body, 0.4 parts of solid superacid (SO 4 2- / TiO 2 / La 3+ ) into the reaction device, heated up ...

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Abstract

The invention discloses a preparation method of a polycarboxylic acid water reducer with high workability. The preparation method comprises the following steps: mixing acrylic acid with active monomers with high workability, adding an oxidant and co-initiator into the mixture, dropwise adding a mixed solution of unsaturated monomers, chain transferring agent, reducing agent, and water at a low temperature; carrying out reactions to obtain segmented copolymer (intermediate), finally adding methoxy polyethylene glycol and a catalyst to carry out esterification and grafting, and finally neutralizing the products. Through molecular structure design, active monomers with good workability are introduced into polycarboxylic acid water reducer; low temperature polymerization is performed at first, then high temperature esterification is carried out, damage rate of double bonds can be reduced, copolymerization degree is high, and the produced water reducer has good workability and high water reducing rate. The industrial production technology is simple, the production period is largely reduced, and production process is green, environment-friendly, and pollution-free.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of a high workability ester polycarboxylate water reducer. Background technique [0002] In recent years, with the development of my country's Twelfth Five-Year Plan, the government will invest a lot of money in various aspects such as infrastructure construction, livelihood projects, and environmental protection. The construction of large-scale infrastructure such as water conservancy, tunnels, and bridges, and polycarboxylate high-performance water reducers Still in a high market demand. [0003] Polycarboxylate superplasticizer has been developed rapidly because of its convenient raw material supply, simple production process and stable product. However, in the actual application process, due to the particularity of many domestic projects and obvious seasonal changes, as well as the uneven quality of sand and stone materials in diffe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/02C08F293/00C08F220/06C08F230/02C08F220/34C08F4/40C08F2/38C04B24/32C04B103/30
Inventor 曾贤华方云辉柯余良张小芳吴银财郑荣平李格丽林倩
Owner KZJ NEW MATERIALS GROUP CO LTD
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