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Water-reducing bulk polymerization solid polycarboxylate superplasticizer, and preparation method, use method and application thereof

A technology of bulk polymerization and polycarboxylate, which is applied in the field of water-reducing bulk polymerization solid polycarboxylate water reducer and its preparation, use and application, can solve problems such as poor effect, non-environmental protection, and difficult reaction process. Achieve the effect of good initial slump, good slump retention effect and high water reducing rate

Pending Publication Date: 2020-04-17
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, due to the anhydrous or very little water in the reaction environment, the bulk polymerization process is more difficult, and the resulting finished product is less effective than the mother liquor of the same solid water reducer, and there is an application bottleneck
On the other hand, conventional small materials such as mercaptopropionic acid, mercaptoacetic acid, mercaptoethanol, etc. have a strong sulfide odor and do not meet the theme of green environmental protection

Method used

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  • Water-reducing bulk polymerization solid polycarboxylate superplasticizer, and preparation method, use method and application thereof
  • Water-reducing bulk polymerization solid polycarboxylate superplasticizer, and preparation method, use method and application thereof

Examples

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preparation example Construction

[0073] The present invention also provides a preparation method of the water-reducing bulk polymerized solid polycarboxylate water-reducer derived from environmentally friendly and odorless raw materials, which includes the following steps: adding 10% of acrylic acid to the mixture A under stirring conditions %-50% of acrylic acid and sodium methacrylic sulfonate, after stirring evenly, add hydrogen peroxide, then dropwise add solution B, solution C, solution D to carry out polymerization reaction, after aging for a predetermined period of time, the liquid product after the heat preservation is completed Quickly pour it on the aluminum foil paper, cool and make tablets, wait for the liquid product to cool and solidify naturally, and obtain a water-reducing bulk polymerized solid polycarboxylate water-reducer with a solid content of 94.5wt% to 100wt% derived from environmentally friendly and odorless raw materials ;

[0074] The mixture A is obtained by mixing unsaturated polye...

Embodiment 1

[0100] (1) Preparation before polymerization:

[0101] Preparation of mixture A: Weigh 100 parts by weight of methallyl polyoxyethylene ether with a number average molecular weight of 2000, put it into a polymerization reactor, heat it to 50°C, and when it is in a molten state, start stirring to accelerate melting. When it is completely melted into a liquid, add 1.0 parts by weight of sodium phosphite, 0.3 parts by weight of ammonium hypophosphite, and 0.3 parts by weight of potassium hypophosphite, stir evenly, keep at 50°C, and set aside;

[0102] Preparation of solution B: Weigh 0.5 parts by weight of L-ascorbic acid, 1.0 parts by weight of E51, 0.9 parts by weight of sodium formaldehyde sulfoxylate and 1.2 parts by weight of water, stir evenly, and prepare to add dropwise;

[0103] Preparation of solution D: Weigh 12.5 parts by weight of acrylic acid and prepare dropwise;

[0104] (2) Polymerization: step (1) put into the polymerization reactor of mixture A, start stirrin...

Embodiment 2

[0107] (1) Preparation before polymerization:

[0108] Preparation of mixture A: Weigh 100 parts by weight of methallyl polyoxyethylene ether with a number average molecular weight of 2400, put it into a polymerization reactor, heat it to 60°C, and when it is in a molten state, start stirring to accelerate melting. When it completely melts into a liquid, add 1.5 parts by weight of sodium hypophosphite and 0.8 parts by weight of water, stir evenly, keep at 60°C, and set aside;

[0109] Preparation of Solution B: Weigh 2.5 parts by weight of E51, 0.1 parts by weight of sodium formaldehyde sulfoxylate and 1.3 parts by weight of water, stir evenly, and prepare dropwise;

[0110] Preparation of Solution C: Weigh 0.5 parts by weight of ammonium persulfate and 0.5 parts by weight of water, stir evenly, and prepare for dropwise addition;

[0111] Preparation of solution D: Weigh 18.7 parts by weight of acrylic acid and prepare dropwise;

[0112] (2) Polymerization: step (1) put into...

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Abstract

The invention relates to a water-reducing bulk polymerization solid polycarboxylate superplasticizer. Raw materials for preparing the water-reducing bulk polymerization solid polycarboxylate superplasticizer comprise unsaturated polyether, an alkenyl unsaturated monomer, an oxidizing agent and a phosphite or hypophosphite chain transfer agent. The invention also relates to a preparation method, ause method and an application of the water-reducing bulk polymerization solid polycarboxylate superplasticizer. The bulk polymerization solid polycarboxylate superplasticizer is prepared from odorlesssmall materials, conforms to the development trend of environment-friendly green chemistry, and is simple in preparation process, high in water reducing rate and good in slump retaining effect.

Description

technical field [0001] This application relates to the technical field of building materials, in particular to a water-reducing bulk polymerized solid polycarboxylate water reducer derived from environmentally friendly and odorless raw materials, the water-reduced bulk polymerized solid polycarboxylate water reducer derived from environmentally friendly The preparation method of the agent, the use method of the water-reducing bulk polymerized solid polycarboxylate water reducer derived from environmentally friendly and odorless raw materials, and the water-reduced bulk polymerized solid polycarboxylate water reducer derived from environmentally friendly and odorless raw materials are in Application in construction projects that require high concrete initial fluidity and slump protection effect. Background technique [0002] With the development of the water reducer industry, polycarboxylate water reducer has gradually become the most widely used concrete admixture. At prese...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F228/02C08F2/38C04B24/16C04B24/26C04B103/30
CPCC08F283/065C08F2/38C04B24/165C04B24/2605C04B2103/302
Inventor 董建国王宜慧罗琼陈洁何素娟
Owner SHANGHAI DONGDA CHEM
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