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Allyl polyether maleic acid (anhydride) copolymer, preparation and application thereof

A technology of allyl polyether and copolymer, which is applied in the field of allyl polyether-based maleic acid series copolymer, can solve the problems of low conversion rate of macromonomer, low polymerization activity, high price, etc., and achieves easy molecular weight Its distribution, reasonable molecular structure, and the effect of improving the conversion rate

Active Publication Date: 2013-06-19
JIANGSU SOBUTE NEW MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Introduction Put allyl polyether monomer and maleic acid (anhydride) monomer into the bottom of the tank, drop other functional monomers, under the action of persulfate or redox system initiator (not used at the same time) The water reducer is prepared. This method uses the alternating copolymerization of functional monomers and maleic acid (anhydride) to increase the conversion rate of the monomer, but is limited by the polymerization activity of the allyl polyether itself, and the conversion rate of the macromonomer Still low, water reduction and slump performance are limited
This common method of increasing the conversion rate of allyl polyether and maleic acid (anhydride) by adding a third monomer or adding more monomers, the applicant has also carried out a large number of experiments, can only partially solve the problem of allyl polyether and maleic anhydride. The disadvantage of low polymerization activity of polyether-based monomers is that the range of improvement is very limited, and the added functional monomers are generally easy to homopolymerize, and the price is expensive, which increases the cost and increases the complexity of the equipment in production. sex

Method used

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  • Allyl polyether maleic acid (anhydride) copolymer, preparation and application thereof
  • Allyl polyether maleic acid (anhydride) copolymer, preparation and application thereof
  • Allyl polyether maleic acid (anhydride) copolymer, preparation and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0049] To a glass reactor equipped with a thermometer, stirrer, dropping funnel, reflux condenser and nitrogen conduit was added 250 g of deionized water, 60 g of A-1 (0.15 mol), 360 g of A-3 (0.15 mol) and 58.8 g of B -1 (0.6mol), stir and heat up to dissolve, and purge the reaction vessel with nitrogen, heat up to 35°C and keep constant temperature, add 4.08g 30% P-H (0.036mol) and 0.025g P-F. First, 70g of a homogeneous aqueous solution containing 1.58g of P-L (0.009mol) was added dropwise to the reactor at a uniform speed for 1h; then the temperature of the system was raised to 80°C, and then 133g of 6.15g of P-A was added dropwise at a uniform rate. (0.027mol) of the initiator aqueous solution, the dropwise addition time was 4h. After the whole solution was added dropwise, it was kept for 2h, cooled to 50°C, and neutralized to pH=7 by adding sodium hydroxide to obtain a light yellow transparent liquid with a solid content of 50.7% and a weight-average molecular weight of ...

Embodiment 2

[0051] Add 250g deionized water, 288g A-2 (0.24mol) and 17.52g B-1 (0.24mol) to the glass reactor equipped with thermometer, stirrer, dropping funnel, reflux condenser and nitrogen conduit, and stir to heat up. After dissolving, purging the reaction vessel with nitrogen, and heating to 35° C. and maintaining a constant temperature, 2.18 g of 30% P-H (0.019 mol) was added. First, 70g of a homogeneous aqueous solution containing 0.85g of P-L (0.0048mol) was added to the reactor in a uniform dropwise manner for 1h; then the temperature of the system was raised to 80°C, and 133g of 3.28g of P-A was added dropwise at a uniform rate. (0.014mol) of the initiator aqueous solution, the dropwise addition time was 4h. After all the solutions were added dropwise, the solution was kept for 2 hours, cooled to 50°C, and neutralized to pH=7 by adding sodium hydroxide to obtain a light yellow transparent liquid with a solid content of 40.2% and a weight-average molecular weight of 61,000, whic...

Embodiment 3

[0053] Add 140g deionized water, 480g A-3 (0.2mol) and 58.8g B-1 (0.6mol) to the glass reactor equipped with thermometer, stirrer, dropping funnel, reflux condenser and nitrogen conduit, and stir to heat up. Dissolved, and the reaction vessel was purged with nitrogen, and after warming to 35°C and maintaining a constant temperature, 3.63 g of 30% P-H (0.032 mol) was added. First, 70g of a homogeneous aqueous solution containing 1.41g P-L (0.008mol) was added dropwise to the reactor at a constant rate for 1h; then the temperature of the system was raised to 80°C, and 133g of 5.47g P-A was added dropwise at a uniform rate. (0.024mol) of the initiator aqueous solution, the dropwise addition time was 4h. After the whole solution was added dropwise, it was kept for 2 hours, cooled to 50°C, and neutralized to pH=7 by adding sodium hydroxide to obtain a light yellow transparent liquid with a solid content of 60.4% and a weight-average molecular weight of 68,000, which was named for s...

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Abstract

The invention relates to an allyl polyether maleic acid (anhydride) copolymer and a preparation thereof, which can effectively improve the conversion rates of allyl polyether and maleic acid (anhydride). The invention also provides an application of the allyl polyether maleic acid (anhydride) copolymer as a water reducer. The preparation method of the allyl polyether maleic acid (anhydride) copolymer is polymerization of a monomer A and a monomer B in an aqueous solution, wherein the molar ratio of the monomer A and the monomer B is 1:1 to 1:9, the monomer A is shown in general formula (I), the monomer B is shown in general formula (II) or (III); all the monomer A and B are added into a reaction container once; the mixture is stirred uniformly; a redox system initiator is firstly added for reaction; then a persulfate initiator is added for reaction till the conversion rate of the allyl polyether is 85-95% and the conversion rate of the maleic acid (anhydride) and its salts is 75-90%; the weight average molecular weight of the copolymer is 40,000-100,000.

Description

technical field [0001] The invention relates to an allyl polyether-based maleic acid (anhydride) series copolymer, a preparation method and application thereof. Background technique [0002] Water reducing agent, also known as dispersant or plasticizer, has the following main functions: (1) improving the workability of concrete while keeping the components unchanged; (2) reducing mixing under given workability conditions (3) Under the condition of not changing the service performance, reduce the unit cement consumption to reduce creep, shrinkage and thermal stress caused by cement hydration heat. [0003] In recent years, the rapid development of the domestic construction industry has increased the demand for water reducing agents year by year. However, although traditional naphthalene-based, melamine-based and other polycondensation-type water-reducing agents have good dispersibility, the fluidity of fresh concrete loses a lot over time, and naphthalene, formaldehyde and c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F222/02C08F222/06C08F4/40C04B24/26
Inventor 冉千平张志勇刘加平缪昌文杨勇周栋梁毛永琳乔敏
Owner JIANGSU SOBUTE NEW MATERIALS
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