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Preparation method of micro-crosslinking long-acting slump retaining agent

A slump-retaining agent and micro-crosslinking technology, applied in the field of construction admixtures, can solve problems such as difficulty in meeting slump-retaining requirements, excessive slump loss, and impact on engineering construction and quality, achieving large steric hindrance and improving dispersion Ability, the effect of good collapse ability

Inactive Publication Date: 2018-01-12
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Concrete is transported under high temperature for a long time, and the slump loss is often too fast, which affects the construction and quality of the project.
[0004] At present, the existing slump-retaining agents in the market can only partially meet the short-term (within 1-2h) slump requirements of ordinary concrete in the application of concrete, and it is difficult to meet the long-distance transportation of some special engineering concrete at high temperature (above 40°C). Long-term (more than 3h) collapse protection requirements

Method used

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  • Preparation method of micro-crosslinking long-acting slump retaining agent
  • Preparation method of micro-crosslinking long-acting slump retaining agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Preparation of unsaturated cross-linked small monomers:

[0024] In a four-necked flask equipped with a reflux condenser, add 100 parts by weight of 1,2 dichloroethane, start the mixer to stir, heat up to 46°C, slowly add 1 part by weight of concentrated hydrochloric acid as a catalyst, and then add 20 parts by weight of formaldehyde And 0.05 parts by weight of copper sulfate, followed by adding 26 parts by weight of acrylamide, reacted for 0.5h.

[0025] Raise the temperature to 60°C, add 14 parts by weight of acrylamide, and react for 0.5h.

[0026] The temperature was raised to 75° C., and 14 parts by weight of acrylamide was added to react for 1 hour.

[0027] After the reaction is completed, lower the temperature to 45°C, adjust the pH value to 6 with ammonia water, keep the temperature for 2 hours, cool and crystallize, wash and dry to obtain the unsaturated cross-linked small monomer.

[0028] (2) Copolymerization reaction:

[0029] Dissolve 100 parts of p...

Embodiment 2

[0035] (1) Preparation of unsaturated cross-linked small monomers:

[0036] In a four-necked flask equipped with a reflux condenser, add 100 parts by weight of cyclohexane, start the stirrer to stir, heat up to 48 ° C, slowly add 3 parts by weight of concentrated sulfuric acid as a catalyst, and then add 22 parts by weight of paraformaldehyde and 0.1 Parts by weight of hydroquinone, followed by adding 22 parts by weight of acrylamide, and reacting for 1 hour.

[0037] Raise the temperature to 65°C, add 11 parts by weight of acrylamide, and react for 1 hour.

[0038] The temperature was raised to 73° C., and 11 parts by weight of acrylamide was added to react for 2 hours.

[0039] After the reaction is completed, lower the temperature to 50°C, adjust the pH value to 7 with ammonia water, keep the temperature for 1 hour, cool and crystallize, wash and dry to obtain the unsaturated cross-linked small monomer.

[0040] (2) Copolymerization reaction:

[0041] Dissolve 100 parts ...

Embodiment 3

[0047] (1) Preparation of unsaturated cross-linked small monomers:

[0048]In a four-necked flask equipped with a reflux condenser, add 100 parts by weight of methyl ethyl ketone, start the mixer to stir, raise the temperature to 50 ° C, slowly add 2 parts by weight of concentrated hydrochloric acid as a catalyst, and then add 24 parts by weight of formaldehyde and 0.15 parts by weight of p-Hydroxyanisole, followed by adding 24 parts by weight of acrylamide, and reacted for 0.5h.

[0049] Raise the temperature to 63°C, add 12 parts by weight of acrylamide, and react for 0.5h.

[0050] Raise the temperature to 72°C, then add 12 parts by weight of acrylamide, and react for 1.5 hours.

[0051] After the reaction, the temperature was lowered to 48°C, the pH value was adjusted to 6 with ammonia water, and then kept for 2 hours, cooled to crystallize, washed, and dried to obtain unsaturated cross-linked small monomers.

[0052] (2) Copolymerization reaction:

[0053] Dissolve 100...

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Abstract

The invention discloses a preparation method of a micro-crosslinking long-acting slump retaining agent. The preparation method comprises the following steps: firstly, preparation of an unsaturated crosslinked small monomer; secondly, copolymerization reaction; thirdly, neutralization reaction. According to the preparation method disclosed by the invention, by self-preparation of the unsaturated small monomer and introduction of the unsaturated small monomer into the synthetic reaction, a polymer is slightly crosslinked, and a slump retaining agent molecule is relatively big in size and has greater steric hindrance; a crosslinked structure has a better intercalating-resisting effect and a good mud-resisting property.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of a micro-crosslinked long-acting slump-retaining agent. Background technique [0002] Polycarboxylate water reducer is the third generation of new high-performance water reducer developed after the common water reducer represented by lignin and the high-efficiency water reducer represented by naphthalene. Polycarboxylate superplasticizer has the advantages of high water reducing rate, designable molecular structure, and small air-entrained volume, and is very suitable for preparing high-strength and high-performance concrete. At present, it has been widely used in nuclear power, water conservancy, bridges, tunnels and other large-scale infrastructure and other large-scale projects. However, with the increase of temperature, the problem of large loss of concrete slump is more obvious during the application of polycarboxylate superpla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F230/02C08F220/18C08F220/06C08F220/20C08F220/54C04B24/26C04B103/30
Inventor 赖广兴方云辉赖华珍麻秀星林祥毅尹峻
Owner KZJ NEW MATERIALS GROUP CO LTD
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