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Preparation method and product of vinyl chloride, acrylate multi-copolymerized resin by mass polymerization process

A technology of acrylate and vinyl chloride, applied in the fields of acrylate copolymer resin and vinyl chloride, which can solve the problems of insufficient purity and gel performance, lack of thermal stability and whiteness, and excessive use of additives, etc., to achieve industrialization The effects of promotion, small linear expansion coefficient, and easy control of polymerization degree

Inactive Publication Date: 2011-10-26
NEIJIANG YUNTONG PLASTIC AUX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the product contains a lot of electrolytes, and the purity and gel performance are not excellent enough; at the same time, due to the use of more additives in the production process, the thermal stability and whiteness of the product are also lacking, so it cannot be widely used to replace the high-grade resin obtained by the ethylene method

Method used

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  • Preparation method and product of vinyl chloride, acrylate multi-copolymerized resin by mass polymerization process

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 1. Raw materials: commercially available 5% (wt%) acrylate monomer (composed of methyl acrylate and butyl acrylate in a mass ratio of 2:1), 95% (wt%) vinyl chloride monomer.

[0029] 2. Initiator: Di(2-ethyl)hexyl peroxydicarbonate and cumyl peroxyneodecanoate are compounded at a mass ratio of 1:2, the total mass of the initiator is 0.02% of the mass of the raw material, and the reaction During the process, the real-time dynamic mass fraction of the initiator in the system is controlled to be no more than 0.05%.

[0030] 3. Put 10% (wt%) raw material weight of vinyl chloride monomer and an initiator equivalent to 0.1% of the mass of the fed monomer into the pre-polymerization kettle, and stir at high speed, 40-43°C and 0.40-0.65Mpa pressure conditions Under the reaction, the prepolymerization product of vinyl chloride (VCM) is generated. When the weight-average degree of polymerization of the prepolymerization product reaches 10%, the VCM prepolymerization product is tr...

Embodiment 2

[0032] Repeat embodiment 1 step, difference is:

[0033] Raw material composition: commercially available 15% (wt%) acrylate monomer (such as ethyl acrylate and isooctyl acrylate at a mass ratio of 1:3), 85% (wt%) vinyl chloride monomer.

[0034] Initiator composition: Di(2-ethyl)hexyl peroxydicarbonate and cumyl peroxyneodecanoate are compounded at a mass ratio of 1:1, the total mass of the initiator is 0.08% of the mass of the raw material, the reaction process , the real-time dynamic mass fraction of the control initiator in the system is not greater than 0.05%.

[0035] During the reaction, keep the pressure in the polymerization tank at 0.70-0.75Mpa and the temperature at 60-63°C.

[0036] The measured weight-average degree of polymerization of acrylate is about 93%, the average molecular weight of the product is about 1100, the number-average molecular weight is about 48000, the whiteness is 81, and the gelation temperature is 77°C.

Embodiment 3

[0038] Repeat embodiment 1 step, difference is:

[0039] Composition of raw materials: 25% (wt%) commercially available acrylate monomer (composed of butyl acrylate, isooctyl acrylate, etc., nonyl acrylate in a weight ratio of 1:1:3), 75% (wt%) Vinyl chloride monomer.

[0040] Initiator composition: Di(2-ethyl)hexyl peroxydicarbonate and cumyl peroxyneodecanoate are compounded at a mass ratio of 2:1, the total mass of the initiator is 0.04% of the mass of the raw material, the reaction process , the real-time dynamic mass fraction of the control initiator in the system is not more than 0.05%.

[0041] During the reaction, keep the pressure in the polymerization tank at 0.58-0.72Mpa and the temperature at 68-70°C.

[0042] The measured weight-average degree of polymerization of acrylate is about 90%, the average molecular weight of the product is about 1100, the number-average molecular weight is about 44000, the whiteness of the product is 81, and the gelation temperature is...

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Abstract

The invention discloses a preparation method and a product of vinyl chloride, acrylate multi-copolymerized resin by mass polymerization process; a vinyl chloride pre-polymerized product is prepared firstly by a mass polymerization process, and the pre-polymerized product is copolymerized with two or more acrylates. The method has the characteristics of short time, high yield, easily-controllable polymerization degree, and low energy consumption; the process is simple, and the conditions are easy to control; the prepared product has the characteristics of low temperature resistance, corrosion resistance, overpressure resistance, high impact resistance, good rigidity, small linear expansion coefficient, and long service life, also has less electrolyte contents, high purity, good whiteness, uniform resin particles, good product transparency, and good plasticizing property, can substitute high-grade resin obtained by an ethene method, and is widely applicable to the production of high-end products.

Description

technical field [0001] The invention relates to vinyl chloride and acrylate copolymer resin, in particular to a method for preparing vinyl chloride and acrylate copolymer resin based on the principle of bulk method and a product obtained by the method. Background technique [0002] Polyvinyl chloride resin is a synthetic material widely used in the world today. It is the second most used synthetic material worldwide. According to statistics, China's production capacity in 2010 exceeded 17 million tons, with an annual increase of more than 10%. However, PVC is hard, has poor plasticity, poor impact resistance and weather resistance, especially low temperature toughness, which greatly restricts the application of PVC in industry, agriculture and construction. In order to continuously expand the application range of high-impact-resistant plastics, improve processing conditions, and overcome the low-temperature brittleness and notch sensitivity of PVC resin, research on PVC to...

Claims

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Application Information

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IPC IPC(8): C08F214/06C08F220/14C08F220/18C08F2/02
Inventor 桂先伦欧阳远哲吴运亨
Owner NEIJIANG YUNTONG PLASTIC AUX
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