Polycarboxylate water reducer with small temperature sensibility

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of polycarboxylic acid water reducing agent, can solve the problems such as no involvement, and achieve the effects of avoiding rearrangement, small slump loss and high water reducing rate.

Active Publication Date: 2019-03-22
南京友西科技集团股份有限公司
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  • Polycarboxylate water reducer with small temperature sensibility

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Embodiment 1

[0027] A polycarboxylate water-reducer with little temperature sensitivity, comprising 10 parts by weight of methacrylic acid, 1 part of alkaline catalyst sodium hydroxide, 60 parts of antifreezing agent calcium chloride, and the free radical initiator is AIBN. .1 part, 30 parts of acrylic acid, 150 parts of polyethylene glycol monomethyl ether and 10 parts of pozzolan.

[0028] The preparation method is: (1) Add acrylic acid, AIBN and water into a four-necked flask, stir and heat up to 70°C, add methacrylic acid, reducing agent, acrylic acid and AIBN dropwise, react for 2 hours, add water to obtain a solid content of 55 % viscous polymer liquid;

[0029] (2) Add polyethylene glycol monomethyl ether and alkaline catalyst sodium hydroxide to the viscous polymer liquid prepared in step (1) and stir. The reaction temperature is 100° C., and the reaction time is 4 hours. Vacuum, keep the vacuum at 5000Pa, after the reaction is completed, cool to below 60°C to prepare an ester pol...

Embodiment 2

[0032] A polycarboxylate water reducer with little temperature sensitivity, comprising 15 parts by weight of methacrylic acid, 3 parts of alkaline catalyst sodium hydroxide, 70 parts of antifreeze methanol, and the free radical initiator is AIBN0.15 50 parts of acrylic acid, 200 parts of polyethylene glycol monomethyl ether and 15 parts of volcanic ash.

[0033] The preparation method is: (1) Add acrylic acid, AIBN and water into a four-necked flask, stir and heat up to 70°C, add methacrylic acid, reducing agent, acrylic acid and AIBN dropwise, react for 3 hours, add water to obtain a solid content of 63 % viscous polymer liquid;

[0034] (2) Add polyethylene glycol monomethyl ether and alkaline catalyst sodium hydroxide to the viscous polymer liquid prepared in step (1) and stir. The reaction temperature is 110°C, and the reaction time is 6 hours. Vacuum, keep the vacuum at 5000Pa, after the reaction is completed, cool to below 60°C to prepare an ester polycarboxylate water ...

Embodiment 3

[0037]The difference from Example 2 is that a polycarboxylate water reducer with little temperature sensitivity includes 20 parts by weight of methacrylic acid, 5 parts of basic catalyst diethanolamine, and 75 parts of antifreeze methanol. The base initiator is 0.15 parts of AIBN, 50 parts of acrylic acid, 200 parts of polyethylene glycol monomethyl ether and 15 parts of pozzolan.

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Abstract

The invention provides a polycarboxylate water reducer with small temperature sensibility. The polycarboxylate water reducer with small temperature sensibility is prepared from the components in partsby weight: 10 to 30 parts of methacrylic acid, 1 to 10 parts of basic catalyst, 60 to 90 parts of antifreezing agent, 0.1 to 0.3 part of radical initiator being AIBN, 30 to 90 parts of acrylic acid,150 to 450 parts of monomethoxy poly(ethylene glycol), and 10 to 30 parts of trass volcanic ash. The temperature sensibility of the prepared water reducer is reduced, and the slump loss resistance ofconcrete and the water reducing ratio of the water reducer can maintain relatively high level during construction in different seasons; ultralong-distance concrete pumping and super high-early-strength concrete preparing can be realized, and the requirement of the high durability of the concrete is met; by using the basic catalyst, side reaction such as rearrangement occurring during the catalyticprocess of a strong acid catalyst is avoided, and the step of alkaline solution or water dilution required in the later period is omitted; by selecting a preparation method for firstly polymerizing and then esterifying, the dosage of the initiator is less, the resources are saved, and the polycarboxylate water reducer is environmentally friendly.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to a polycarboxylate water reducer with little temperature sensitivity. Background technique [0002] As one of the main materials in the construction industry, concrete is applied on a large scale. The function of the water reducing agent in the prior art is only to quickly reduce the water content and make the concrete set as soon as possible. However, the water-reducing agent for concrete in the prior art has high cost, complex manufacturing process, difficult method, low qualified rate of finished products, poor slump resistance, low anti-bleeding ability, large conveying resistance, air bubbles, appearance Poor quality, poor frost resistance. [0003] Polycarboxylate high-performance water reducer is a concrete water reducer (also known as superplasticizer) with high technological content and excellent comprehensive performance in the world. Polycarboxylate water-reducers i...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C04B24/26C04B103/30
Inventor 王晓芳缪海燕盛思仲段周玉鹿立云
Owner 南京友西科技集团股份有限公司
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