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Method for preparing cement water reducer by utilizing styrene-acryonitrile copolymer waste

A technology of acrylonitrile and styrene, which is applied in the field of waste utilization and processing, can solve environmental problems such as pollution, lack of mechanical properties and application characteristics, and achieve the effects of ensuring stability, low water penetration rate, and broad application prospects

Inactive Publication Date: 2010-09-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The waste is the leftover powder of the finished plastic of styrene-acrylonitrile copolymer. If it is not recycled, it will cause great pollution to the environment.
Since these waste plastic powders do not have the mechanical properties and application characteristics that can be used directly, it is difficult to simply recycle them to make products for use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The following raw materials are used in parts by mass: 10 parts of styrene-acrylonitrile copolymer waste (molar ratio of styrene: acrylonitrile monomer = 70:30), 60 parts of 98% concentrated sulfuric acid; Purify and pulverize, add concentrated sulfuric acid according to the proportion, fully stir, and react at 85 ° C for 5 hours. The product is added in batches to the cement slurry under agitation. The blank fluidity of the pure slurry measured at room temperature is 137mm. When the amount of water reducing agent is 1% (weight % of cement), the fluidity of the slurry is 198mm, and the effective water reducing degree is 19.7%.

Embodiment 2

[0017] The following raw materials are used in parts by mass: 10 parts of styrene-acrylonitrile copolymer waste (molar ratio of styrene: acrylonitrile monomer = 10:90), 100 parts of 85% concentrated sulfuric acid; Purify and pulverize, add concentrated sulfuric acid according to the proportion, fully stir, and react at 70 ° C for 7 hours. The product is added in batches to the cement slurry under agitation. The blank fluidity of the pure slurry measured at room temperature was 137mm. When the amount of water reducing agent was 1% (weight % of cement), the fluidity of the slurry was 216mm, and the effective water reduction was 22.0%.

Embodiment 3

[0019] The following raw materials were used in parts by mass: 10 parts of styrene-acrylonitrile copolymer waste (molar ratio of styrene: acrylonitrile monomer = 60:40), 90 parts of 90% concentrated sulfuric acid; Purify and pulverize, add concentrated sulfuric acid according to the proportion, fully stir, and react at 100 ° C for 2 hours. The obtained product is separated from waste acid by suction filtration, washed with water, dried and pulverized to obtain sulfonated hydrolyzate. The product is dark brown powder. The product is added in batches to the cement slurry under agitation. The blank fluidity of the pure slurry measured at room temperature is 137mm. When the amount of water reducing agent is 1% (weight % of cement), the fluidity of the slurry is 187mm, and the effective water reducing degree is 17.8%.

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Abstract

The invention relates to a method for preparing cement water reducer by utilizing styrene-acryonitrile copolymer waste, comprising the following steps: selecting 10 parts of foamed plastic waste of styrene-acryonitrile copolymer, 60-100 parts of concentrated sulfuric acid and 0-40 parts of organic solvent in parts by weight; evenly mixing the above materials; stirring at the temperature of 70-100 DEG C, reacting for 2-7 hours; separating and purifying the product to obtain powder production. The styrene-acryonitrile copolymer foamed plastic waste is derived from styrene-acryonitrile copolymer foamed plastic powder, wherein, the monomer mole ratio of styrene to acryonitrile is 10-70 to 90-30. The solvent is used by adopting one of or mixture of more than one of cyclohexane, 1, 2-dichloroethane and pyridine. Tests indicate that the product of the invention has certain water reducing property and higher water reducing efficiency to cement, and the highest water reducing rate can reach over 20%. The invention also has low product cost, simple production technology, excellent comprehensive performance and certain competitive advantage compared with the same products on the market; on the other hand, the invention solves the pollution problem of waste plastics to environment.

Description

technical field [0001] The invention belongs to the field of waste utilization and processing, and relates to a method for preparing a cement water reducing agent by utilizing styrene-acrylonitrile copolymer waste. Background technique [0002] Cement is composed of a variety of inorganic salt particles with different charges, so the cement will produce a flocculation structure during the process of adding water and stirring. The formation of flocculation structure encapsulates the free water in the cement slurry, resulting in a decrease in the fluidity of the cement slurry. Adding water reducer to cement concrete can reduce the water consumption of cement slurry, and on this basis, it can ensure the fluidity of cement slurry and play a role in stabilizing cement concrete. Common cement superplasticizers mainly include lignin-based superplasticizers, naphthalene-based superplasticizers, resin-based superplasticizers and humate superplasticizers. But the cost is higher. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/44C08F212/10C08F8/36C08F8/12C04B24/26C04B103/30
Inventor 刘晓菲曾安蓉李琳吴博
Owner TIANJIN UNIV
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