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Benzene ring-containing amide block polymer modified polycarboxylate water reducer and preparation method thereof

A benzene ring amide block and polymer technology, which is applied in the field of building materials, can solve the problems of large slump loss over time and poor workability, and achieve the effects of reducing rigidity, simple and easy to operate in the preparation process, and easy to bend

Inactive Publication Date: 2020-05-29
ZHEJIANG COLLEGE OF CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The products of this process have the problems of large slump loss over time and poor workability

Method used

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  • Benzene ring-containing amide block polymer modified polycarboxylate water reducer and preparation method thereof

Examples

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example 1

[0022] The described polycarboxylate water reducer modified with benzene ring amide block polymer and its preparation method is mainly prepared from the following components: vinyl butyl ether polyoxyethylene ether: 350 parts; acrylic acid: 32 parts 4-(acrylamide) benzoic acid: 8 parts; 1-allyl-2-fluorobenzene: 10 parts; dibenzoyl peroxide: 0.5 parts; azobisisoheptanonitrile: 1.2 parts; Isobutylcyanoformyl: 1.5 parts; mercaptoethanol: 1.3 parts; the rest is water, with a total mass of 1000 parts and a solid content of 40%.

[0023] Described a kind of polymer-modified polycarboxylate water-reducer containing benzene ring amide block and preparation method thereof, the specific preparation process is as follows:

[0024] 1) Preparation of benzene ring amide block: add 10 parts of 1-allyl-2-fluorobenzene, 8 parts of dibenzoyl peroxide and 50 parts of deionized water into the No. The initiator is added dropwise, that is, a mixed solution of 0.5 parts of dibenzoyl peroxide and 50...

example 2

[0028]The described polycarboxylate water reducer modified with benzene ring amide block polymer and its preparation method is mainly prepared from the following components: vinyl butyl ether polyoxyethylene ether: 352 parts; acrylic acid: 30 parts 2-acrylamidophenylboronic acid: 5 parts; 1-allyl-4-fluorobenzene: 9 parts; lauryl peroxide: 0.6 parts; dimethyl azobisisobutyrate: 1.3 parts; Diisobutyronitrile: 1.7 parts; mercaptopropanol: 1.8 parts; the rest is water, with a total mass of 1000 parts and a solid content of 40%.

[0029] Described a kind of polymer-modified polycarboxylate water-reducer containing benzene ring amide block and preparation method thereof, the specific preparation process is as follows:

[0030] 1) Preparation of cyclic amide block: add 9 parts of 1-allyl-4-fluorobenzene, 5 parts of 2-acrylamide phenylboronic acid and 50 parts of deionized water into the No. The initiator is added dropwise, which is a mixed solution of 0.6 parts of lauryl peroxide an...

example 3

[0034] The described polycarboxylate water reducer modified with benzene ring amide block polymer and its preparation method is mainly prepared from the following components: vinyl butyl ether polyoxyethylene ether: 355 parts; acrylic acid: 28 parts 4-vinylbenzamide: 6 parts; 1-phenylvinylboronic acid: 7 parts; dibenzoyl peroxide: 0.7 parts; azobisisoheptanonitrile: 1.4 parts; Acyl: 2 parts; mercaptoethanol: 1.6 parts; the rest is water, the total mass is 1000 parts, and the solid content is 40%.

[0035] Described a kind of polymer-modified polycarboxylate water-reducer containing benzene ring amide block and preparation method thereof, the specific preparation process is as follows:

[0036] 1) Preparation of benzene cyclic amide block: Add 7 parts of 1-phenylvinylboronic acid, 6 parts of 4-vinylbenzamide and 50 parts of deionized water into the No. 1 reaction kettle and stir evenly, then dropwise add The initiator is a mixed solution of 0.7 parts of dibenzoyl peroxide and ...

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Abstract

The invention provides a benzene ring-containing amide block polymer modified polycarboxylate water reducer and a preparation method thereof. The polycarboxylate water reducer mother liquor is prepared from the following materials in parts by weight: 350-362 parts of a polyether macro-monomer, 20-32 parts of acrylic acid, 3-8 parts of an amide monomer, 3-10 parts of a benzene ring monomer, 3-4.5 parts of an initiator, 1.2-1.8 parts of a chain transfer agent and the balance being water, the total mass is 1000 parts, and the solid content is 40%. The polymerization process comprises the following steps: step 1, initiating copolymerization of a benzene ring monomer and an amide monomer at 25-35 DEG C to obtain a hydrophilic block polymer I; step 2, copolymerizing a polyether macro-monomer andacrylic acid at the room temperature to obtain a block polymer II; and step 3, dropwise adding a mixed solution of the block polymer I, acrylic acid and a chain transfer agent and an initiator into the block polymer II at the same time within 2-3 hours at the temperature of 30-50 DEG C, and cooling to the room temperature to obtain the benzene ring amide block polymer modified polycarboxylate water reducer mother liquor. Compared with a common water reducer, the polycarboxylate water reducer is better in adsorption and dispersion effects, stronger in slump loss resistance and better in earlystrength effect.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a polymer-modified polycarboxylate water reducer containing a benzene ring amide block and a preparation method thereof. Background technique [0002] Polycarboxylate Superplasticizer (Polycarboxylate Superplasticizer), as the third generation of new water reducer, has the characteristics of high water reduction, high slump retention, large degree of freedom in cement adaptability to wide molecular structure, remarkable effect on concrete reinforcement, and reduced concrete shrinkage. Applied to highways, bridges, dams, tunnels, high-rise buildings and other projects. In my country, polycarboxylate superplasticizers have been successfully applied to large-scale projects such as the Three Gorges Dam, Sutong Bridge, Tianwan Nuclear Power Plant, and Beijing-Shanghai High-speed Railway, and have achieved remarkable results. However, polycarboxylate superplasticizers also ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F293/00
Inventor 陈树东俞建锋柯凯张言飞何月来余泠毅
Owner ZHEJIANG COLLEGE OF CONSTR
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