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Preparation method of high-molecular surface active agent

A surfactant and polymer technology, applied in the field of preparation of surfactants, to achieve the effect of improving the ability, freeze-thaw stability, and improving performance

Inactive Publication Date: 2010-10-20
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although diblock and triblock copolymers have been well prepared by the RAFT method, the synthesis of amphiphilic diblock copolymers with narrow molecular weight distributions remains a challenge.

Method used

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  • Preparation method of high-molecular surface active agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1, at first 2-{[(dodecylthio) thioformyl] sulfanyl} succinic acid, acrylic acid, dehydrated alcohol and 4,4 '-Azobis(4-cyanovaleric acid) was added to a four-necked flask with a condenser tube, an air guide tube and a thermometer inserted, and the temperature was raised to 80°C after passing through argon, and reacted for 7 hours under the protection of argon to obtain the molecular weight Polyacrylic acid with a distribution of 1.03; Water ethanol: 0.1 mole of 4,4'-azobis(4-cyanovaleric acid): 20 moles of butyl acrylate, adding absolute ethanol, 4,4'-azobis(4-cyanovaleric acid) And butyl acrylate, after passing argon, raise the temperature to 80°C, react under the protection of argon for 7h and distill under reduced pressure. After drying, a light yellow product with a molecular weight distribution of 1.37 is obtained, which is the polymer surfactant. Its CMC (critical micelle concentration) is 7.75×10 -5 g / mL.

Embodiment 2

[0018]Example 2, at first 2-{[(dodecylthio) thioformyl] sulfanyl} succinic acid, acrylic acid, dehydrated alcohol and 4,4 '-Azobis(4-cyanovaleric acid) was added to a four-necked flask with a condenser tube, an air guide tube and a thermometer inserted, and the temperature was raised to 70°C after passing through argon, and reacted for 8 hours under the protection of argon to obtain the molecular weight Polyacrylic acid with a distribution of 1.03; Water ethanol: 0.15 moles of 4,4'-azobis(4-cyanovaleric acid): 30 moles of butyl acrylate, adding absolute ethanol, 4,4'-azobis(4-cyanovaleric acid) And butyl acrylate, after passing argon, raise the temperature to 70°C, react under the protection of argon for 8h and distill under reduced pressure, and after drying, a light yellow product with a molecular weight distribution of 1.23 is obtained, which is the polymer surfactant. Its CMC (critical micelle concentration) is 6.32×10 -5 g / mL.

Embodiment 3

[0019] Example 3, at first 2-{[(dodecylthio) thioformyl] sulfanyl} succinic acid, acrylic acid, dehydrated alcohol and 4,4 '-Azobis(4-cyanovaleric acid) was added to a four-necked flask with a condenser tube, an air guide tube and a thermometer inserted, and the temperature was raised to 75°C after argon was passed through, and the reaction was carried out for 6 hours under the protection of argon to obtain the molecular weight Polyacrylic acid with a distribution of 1.06; Water ethanol: 0.2 moles of 4,4'-azobis(4-cyanovaleric acid): 30 moles of butyl acrylate, adding absolute ethanol, 4,4'-azobis(4-cyanovaleric acid) And butyl acrylate, after passing argon, raise the temperature to 75°C, react under the protection of argon for 6h and distill under reduced pressure. After drying, a light yellow product with a molecular weight distribution of 1.39 is obtained, which is the polymer surfactant. Its CMC (critical micelle concentration) is 5.20×10 -5 g / mL.

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Abstract

The invention relates to a preparation method of high-molecular surface active agent, which is characterized in that: 2 - {[(dodecyl thio) formyl thio] thio} succinic acid alkyl, acrylic acid, absolute ethyl alcohol are reacted with 4, 4'-azo-bis (4 - cyano acid) under the protection of argon gas at the temperature of 55 to 95 DEG C to obtain polyacrylic acid; absolute ethyl alcohol, 4, 4'-azo-bis (4 - cyano acid) and butyl acrylate are added in the polyacrylic acid, the temperature is increased to 55 to 95 DEG C to be reacted for 2 to 8 hours and to be decompressed and distilled after introducing argon gas, and wheat product, i.e. high-molecular surface active agent is obtained after being dried. The prepared molecular surface active agent not only can be used for emulsifying acrylate monomer, but also can be used as emulsifier for polymerizing emulsion. Amphipathy embedded copolymer is riveted on emulsion particles in the emulsion polymerization, and hydrophilic chain section extends into water phase, so the emulsion particles are stable through the space steric effect and the static effect so as to improve the electrolytic-resistant capacity and the frozen stability of the emulsion.

Description

technical field [0001] The invention relates to a preparation method of a surfactant, in particular to a preparation method of a polymer surfactant. Background technique [0002] Polymer surfactants are substances with a molecular weight of several thousand or more and surface activity. Compared with low-molecular surfactants, high-molecular surfactants have good dispersing, emulsifying, thickening, stabilizing, and flocculating properties. , moisturizing agent, antistatic agent, paper strengthening agent and so on have a wide range of applications. [0003] According to the classification of molecular structure and preparation method, polymer surfactants can be mainly divided into graft copolymers, block copolymers and random copolymers. Among them, the study of block copolymers with controllable molecular weight, narrow molecular weight distribution, and designable molecular structure and composition is one of the most meaningful and challenging tasks in the field of pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F293/00C08F120/06B01F17/52C08F2/30C09K23/52
Inventor 周建华沈晓亮马建中张琳吕斌
Owner SHAANXI UNIV OF SCI & TECH
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