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Branched polyether monomer for polycarboxylate superplasticizer and synthesis method of branched polyether monomer

A technology of branched polyether and polycarboxylic acid series, which is applied in the field of branched polyether monomers for polycarboxylate water reducers and its synthesis, can solve the problem that the performance cannot meet the needs of changes in concrete raw materials, and there is no Improvement, cost increase and other problems, to achieve the effect of improving bleeding and segregation phenomenon, improving cost performance and simple production

Active Publication Date: 2019-08-02
福建钟山化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing problem is that the polyether monomer technology that the latest generation of polycarboxylate superplasticizer technology relies on has not been improved for many years, and the performance still cannot meet the needs of changes in concrete raw materials, and the starter used in its polyether monomer (such as Methallyl alcohol, prenyl alcohol, etc. account for an absolute share) production is facing environmental protection pressure, supply is tight, and costs are rising

Method used

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  • Branched polyether monomer for polycarboxylate superplasticizer and synthesis method of branched polyether monomer
  • Branched polyether monomer for polycarboxylate superplasticizer and synthesis method of branched polyether monomer
  • Branched polyether monomer for polycarboxylate superplasticizer and synthesis method of branched polyether monomer

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Experimental program
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Effect test

Embodiment 1

[0045] Add 1 mole (282g) of diglycerol maleate into the autoclave, add 0.125 moles (3g) of catalyst sodium hydride, and heat up to 105°C after nitrogen replacement, gradually feed 50 moles (2200g) of ethylene oxide Addition reaction of alkane, heating up to 150°C, gradually feeding 5 moles (290g) of propylene oxide, after the reaction, then feeding 50 moles (2200g) of ethylene oxide at 120°C for reaction, and then feeding 5 moles (290g) of propylene oxide, then pass into the oxyethane of 50 moles (2200g), treat that reaction finishes, obtain diglycerol maleate polyoxyethylene ether, be cooled to 70 ℃ of discharging, weigh The average molecular weight is 7462.

Embodiment 2

[0047] Add 1 mole of bis-triethanolamine maleate (396g) into the autoclave, add 0.09 mole of catalyst sodium ethylate (6g), replace with nitrogen and heat up to 120°C, gradually feed 45 moles of ethylene oxide (1980g) for addition reaction, heated up to 140°C, then gradually introduced 2 moles (290g) of propylene oxide, after the reaction, added 35 moles of ethylene oxide (1540g), 5 moles of propylene oxide (290g ), then 45 moles (1980g) of ethylene oxide were introduced at 120°C for reaction, after the reaction, the temperature was raised to 150°C, 8 moles of propylene oxide (290g) were added for addition, and then 55 moles of ethylene oxide were passed into Addition reaction of alkanes (2420g) was carried out. After the reaction was completed, bis-triethanolamine maleate polyoxyethylene ether was obtained, and the temperature was lowered to 70°C to discharge the material, with a weight average molecular weight of 9186.

Embodiment 3

[0049] Add 1 mole of monoethylene glycol maleate (160g) into the autoclave, add 0.1 mole of catalyst sodium hydride (2.5g), replace with nitrogen and heat up to 120°C, gradually feed 10 moles of epoxy Ethane (440g) carries out addition reaction, and middle block is passed into the propylene oxide (174g) of 3 moles, finally passes into the oxyethane (1320g) of 30 moles, treats that reaction finishes, obtains maleic acid Monoethylene glycol ester polyoxyethylene ether, cooled to 65°C and discharged, with a weight average molecular weight of 2094.

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Abstract

The invention belongs to the field of synthesis of a polycarboxylate superplasticizer monomer and particularly relates to a branched polyether monomer for a polycarboxylate superplasticizer and a synthesis method of the branched polyether monomer. The method comprises steps as follows: S1, no water exists in a reaction container, inert gas purging is performed after vacuum pumping, and maleic anhydride and a catalyst are added to a high-pressure reaction kettle; S2, the high-pressure reaction kettle in S1 is heated to 105-150 DEG C, epoxyalkane is introduced under the condition of inert gas atmosphere, and maleic anhydride and epoxyalkane are subjected to a ring opening polymerization reaction under the action of a catalyst; S3, after an addition reaction in S2 ends, a product is cooled to65-70 DEG C, a neutralizer is added, the PH value is adjusted, and the polyether monomer is obtained. The maleic acid and polyol ester branched polyether monomer has a special molecular structure, the cost of raw materials including maleic anhydride and polyol substances is low, the polycarboxylate superplasticizer obtained through synthesis is good in performance, and the obtained superplasticizer is high in water-reducing rate, good in slump retention, good in reinforcement effect, easy to produce, environmentally friendly, cost-saving and wide in application.

Description

technical field [0001] The invention belongs to the synthesis field of polycarboxylate water-reducer monomers, and in particular relates to a branched polyether monomer for polycarboxylate water-reducers and a synthesis method thereof. Background technique [0002] The known high-efficiency water reducers such as naphthalene sulfonate series and melamine formaldehyde resin series have relatively high alkali content, which is not conducive to preventing the harmful reaction of alkali aggregate activity in cement concrete. Naphthalene sulfonate water reducer products are made of industrial naphthalene and sulfuric acid. Chemical reaction with formaldehyde for processing will cause pollution due to harmful gases volatilized by sulfonation and formaldehyde condensation reactions. From the 1990s, Japan invented a carboxylic acid polymer water reducer that uses different unit organic compounds to initiate copolymerization. The molecular structure of this type of product is sparse,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G65/28C04B24/26C04B103/30
CPCC08G65/2615C04B24/2605C04B2103/302
Inventor 黎思幸
Owner 福建钟山化工有限公司
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