Polycarboxylate superplasticizer based on phenyl hydroxyl block modification

A technology of phenylhydroxyl block and polycarboxylic acid, which is applied in the field of building materials and achieves the effects of good stability, increased water reduction rate and good shrinkage rate

Pending Publication Date: 2020-06-23
ZHEJIANG COLLEGE OF CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adjusting the ratio of reactants, in order to obtain a polycarboxylate water reducer with controllable polydispers

Method used

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  • Polycarboxylate superplasticizer based on phenyl hydroxyl block modification
  • Polycarboxylate superplasticizer based on phenyl hydroxyl block modification

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example 1:

[0023] A polycarboxylic acid water reducing agent modified based on phenyl hydroxyl block, the total mass of raw materials is 1000 parts, the mass fraction is 40%, and it is mainly prepared from the following main components:

[0024] Styrene: 7 parts; Prenol: 8 parts; Composition of vinyl butyl ether polyoxyethylene ether and methallyl polyoxyethylene ether with a mass ratio of 1: 352 parts; Acrylic acid: 21 Parts; the composition of lauryl peroxide and dibenzoyl peroxide with a mass ratio of 1:1: 1.2 parts; azobisisobuimidazoline hydrochloride: 2.1 parts; mercaptoethanol: 1.4 parts; the rest are water.

[0025] Step (1): Preparation of phenyl hydroxy block polymer: add 7 parts of styrene and 8 parts of isopentenol into the No. ① reaction kettle, mix and stir uniformly, and add the initiator solution dropwise at a uniform rate at 45°C, namely 1.2 parts A mixture of the composition of lauryl peroxide and dibenzoyl peroxide with a mass ratio of 1:1 and 50 parts o...

Example Embodiment

[0027] Example 2:

[0028] A polycarboxylic acid water reducing agent modified based on phenyl hydroxy block, the total mass of raw materials is 1000 parts, the mass fraction is 40%, and it is mainly prepared from the following main components: 1-allyl-4-fluoro Benzene: 4 parts; Methacrylic alcohol: 7 parts; Vinyl butyl ether polyoxyethylene ether: 356 parts; Acrylic acid: 26 parts; Lauryl peroxide: 1.4 parts; Azobis with a mass ratio of 2:1 The composition of dimethyl isobutyrate and azobisisobuimidazoline hydrochloride: 2.4 parts; the composition of mercaptopropanol and mercaptoethanol with a mass ratio of 1:1: 1.2 parts; the rest is water.

[0029] Step (1): Preparation of phenyl hydroxy block polymer: add 4 parts of 1-allyl-4-fluorobenzene and 7 parts of methacrylic alcohol into the No. ① reaction kettle, mix and stir evenly, and at a constant speed at 50°C Drop the initiating liquid, which is a mixture of 1.4 parts of lauryl peroxide and 50 parts of deionized water, and the t...

Example Embodiment

[0031] Example 3:

[0032] A polycarboxylic acid water reducing agent modified based on phenyl hydroxy block, the total mass of raw materials is 1000 parts, the mass fraction is 40%, and it is mainly prepared from the following main components: the mass ratio is 1:2 1- The composition of allyl-4-fluorobenzene and 1-phenylvinylboronic acid: 3 parts; the composition of methacrylic alcohol and allyl alcohol with a mass ratio of 1:1: 8 parts; methallylpolyoxy Vinyl ether: 358 parts; acrylic acid: 24 parts; dibenzoyl peroxide: 1.6 parts; azobisisoheptanonitrile: 2.5 parts; mercaptopropanol: 1.5 parts; the rest is water.

[0033] Step (1): Preparation of phenyl hydroxy block polymer: 3 parts of a composition of 1-allyl-4-fluorobenzene and 1-phenylvinylboronic acid in a mass ratio of 1:2, 8 parts by mass The 1:1 composition of methacrylic alcohol and allyl alcohol was added to the No. ① reactor and mixed and stirred evenly, and the initiating liquid was added dropwise at a constant speed...

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Abstract

The invention provides a polycarboxylate superplasticizer based on phenyl hydroxyl block modification. The polycarboxylate superplasticizer is mainly prepared from the following main components: 3-7 parts of benzene ring monomers; 5-8 parts of a hydroxyl monomer; 352 to 368 parts of a polyether macromonomer; 17 to 26 parts of acrylic acid; 1.1 to 1.8 parts of an initiator a; 2.1 to 2.5 parts of aninitiator b; 1.1 to 1.5 parts of a chain transfer agent; and the balance of water. Wherein the total mass of the raw materials is 1000 parts, and the mass fraction is 40%. The reaction rate and molecular weight distribution of polycarboxylic acid are effectively controlled, and the performance is better.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a polycarboxylate water reducer based on phenyl hydroxyl block modification. Background technique [0002] Concrete is one of the most common building materials. To improve its fresh or hardened concrete, it is undoubtedly necessary to add some concrete admixtures before or during the mixing of the concrete to improve the poor performance of the concrete. As one of the main concrete admixtures, polycarboxylate superplasticizer is also known as superplasticizer. Due to its wide source of copolymer raw materials and designable molecular structure, it is widely used to disperse cement particles in concrete and mortar. However, there are too many factors affecting the performance of polycarboxylate superplasticizers in practical engineering applications, and the use of polycarboxylates cannot achieve the desired effect. The adaptability of polycarboxylate superplasticizer...

Claims

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Application Information

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IPC IPC(8): C08F293/00C04B24/26C04B103/30
CPCC08F293/00C04B24/2694C04B2103/302
Inventor 陈树东张言飞柯凯俞建锋余泠毅李誉婷
Owner ZHEJIANG COLLEGE OF CONSTR
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