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Preparing method for PDMC with high monomer conversion rate and serialized relative molecular mass

A technology of relative molecular mass and monomer conversion rate, which is applied in the field of preparation of PDMC with high monomer conversion rate and serialized relative molecular mass, can solve the impact of unconverted monomer discharge on the environment, does not involve monomer conversion rate, and the product is effective Low composition and other issues, to achieve the effect of enhancing the ability to resist the interference of metal ions on free radical polymerization, stabilizing the conversion rate of monomers, and slowing down the accumulation of heat

Active Publication Date: 2015-11-04
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0010] (2) In the study of the influence of single factors, the monomer conversion rate is not involved, such as literature 1, 2
From the basic principle of polymerization reaction, it can be seen that the change of relative molecular mass in terms of characteristic viscosity by single factor regulation depends on the monomer conversion rate. The characteristic viscosity with low monomer conversion rate is low, and the characteristic viscosity with high monomer conversion rate is high. Products with low conversion rate have low active ingredients, poor use effect, and the discharge of unconverted monomers affects the environment;
[0011] (3) There is no purposeful design and process control method to obtain the preparation method of serialized products with simple process, high stability and high monomer conversion rate, such as literature 1, 2

Method used

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  • Preparing method for PDMC with high monomer conversion rate and serialized relative molecular mass

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Experimental program
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Effect test

Embodiment 1

[0031] Embodiment 1: The preparation method of high monomer conversion rate and serialized relative molecular mass PDMC of the present invention is:

[0032] The first step is to concentrate and purify the industrial monomer DMC aqueous solution, and then add activated carbon to absorb and remove impurities to obtain pretreated monomer raw materials;

[0033] In the second step, under normal temperature (5-25°C), add the industrial product DMC monomer aqueous solution (15.00±1.00) kg after purification and impurity removal treatment into the reactor, and add the monomer mass fraction (0.01±1.00) kg in sequence under stirring with nitrogen gas. 0.005)% metal chelating agent tetrasodium ethylenediaminetetraacetic acid solution, accounting for the monomer mass fraction is (2.00 ± 0.05)% potassium persulfate initiator solution, add distilled water, so that the initial monomer content is (35 ± 2 )%;

[0034] The third step is to heat the reaction system to the polymerization tempe...

Embodiment 2

[0037] Embodiment 2: The preparation method of high monomer conversion rate and serialized relative molecular mass PDMC of the present invention is:

[0038] The first step is to concentrate and purify the industrial monomer DMC aqueous solution, and then add activated carbon to absorb and remove impurities to obtain pretreated monomer raw materials;

[0039] In the second step, under normal temperature (5-25°C), add the industrial product DMC monomer aqueous solution (20.00±1.00) kg after purification and impurity removal treatment into the reactor, and add the monomer mass fraction (0.02±1.00) kg in sequence under stirring with nitrogen gas. 0.005)% metal chelating agent tetrasodium ethylenediaminetetraacetic acid solution, accounting for the monomer mass fraction is (1.50 ± 0.05)% potassium persulfate initiator solution, add distilled water, so that the monomer initial content is (45 ± 2 )%;

[0040] The third step is to heat up the reaction system to the polymerization temp...

Embodiment 3

[0043] Embodiment 3: The preparation method of high monomer conversion rate and serialized relative molecular mass PDMD of the present invention is:

[0044] The first step is to concentrate and purify the industrial monomer DMC aqueous solution, and then add activated carbon to absorb and remove impurities to obtain pretreated monomer raw materials;

[0045] In the second step, under normal temperature (5-25°C), add industrial product DMC monomer aqueous solution (23.50 ± 1.00) g after purification and impurity removal treatment into the reactor, and add the monomer mass fraction (0.03 ± 1.00) g in turn under stirring with nitrogen gas. 0.005)% metal chelating agent tetrasodium ethylenediaminetetraacetic acid solution, accounting for the monomer mass fraction is (0.80 ± 0.05)% potassium persulfate initiator solution, add distilled water, so that the monomer initial content is (55 ± 2 )%;

[0046] The third step is to heat up the reaction system to the polymerization temperat...

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Abstract

The invention discloses a preparing method for PDMC with a high monomer conversion rate and serialized relative molecular mass. The amount of adopted monomer initial content coupling initiator is controlled for preparing the PDMC with the high monomer conversion rate and the serialized relative molecular mass, the monomer conversion rate of a serialized PDMC product obtained through preparation is larger than 98%, the characteristic viscosity value is 2.0-14.0 dL / g, a monomer is DMC, the mass fraction of the monomer is 35-70%, the initiator is water-soluble peroxide initiator, and the amount of the adopted initiator accounts for 0.20-2.00% of the mass fraction of the monomer. According to the method, the industrial product DMC concentrated, adsorbed, purified and cleaned is used as a raw material, a metal ion chelating agent and the water-soluble peroxide initiator are added under the nitrogen condition, and two-step temperature rising initiates polymerizing so that a target product can be generated. The obtained product serves as a positive ion water-soluble polymer with the high monomer conversion rate and the serialized relative molecular mass, is stable in quality, and is widely applied to multiple fields of oil exploitation, papermaking, mining, spinning and printing and dyeing, daily-use chemical industry, water treatment and the like.

Description

technical field [0001] The invention relates to the preparation technology of water-soluble cationic macromolecular compounds, in particular to a method for preparing PDMC with high monomer conversion rate and serialized relative molecular mass by controlling the initial content of monomers and coupling initiator dosage. Background technique [0002] Poly methacrylatoethyltrimethyl ammonium chloride (PDMC for short) is obtained by homopolymerization of methacrylatoethyltrimethyl ammonium chloride (DMC for short). The reaction expression for generating PDMC by free radical polymerization from DMC is as follows: [0003] [0004] The use of polymers depends on the unit structure and relative molecular weight. The unit structure is certain, and its performance and use depend on the relative molecular weight. PDMC products with different relative molecular weights correspond to different properties and performances, which can meet the needs of different uses. Because PDMC h...

Claims

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Application Information

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IPC IPC(8): C08F120/34C08F2/00C08F4/30
Inventor 张跃军唐莉王廷福刘早通
Owner NANJING UNIV OF SCI & TECH
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