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Chlorinated vinyl chloride-based resin

A chlorinated polyvinyl chloride and resin technology, applied in the field of chlorinated polyvinyl chloride series resin, can solve the problems of mold surface pollution, high chlorination, a large amount of hydrogen chloride gas, etc., and achieve the effect of excellent continuous production.

Active Publication Date: 2021-11-30
SEKISUI CHEM CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in the chlorinated polyvinyl chloride resin as described in Patent Document 1, there are many CPVCs that are partially highly chlorinated, so there is a problem in molding them. It is easy to be thermally decomposed during processing, and a large amount of hydrogen chloride gas is generated, and the surface of the mold is polluted.

Method used

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  • Chlorinated vinyl chloride-based resin
  • Chlorinated vinyl chloride-based resin
  • Chlorinated vinyl chloride-based resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0154] In a glass-lined reaction vessel with an inner volume of 300 L, 130 kg of ion-exchanged water and 50 kg of polyvinyl chloride resin with an average degree of polymerization of 1000 were poured into the reaction vessel, and stirred to disperse the polyvinyl chloride resin in water to form a water suspension state. The temperature of the aqueous suspension was raised to 100°C. Next, after reducing the pressure in the reaction vessel to remove oxygen (oxygen amount 100ppm), it was stirred so that the volume of the vortex generated at the gas-liquid interface by stirring became 8.2L, and the chlorine partial pressure became 0.40MPa. Chlorine (oxygen content 50ppm) is introduced in the way, and thermal chlorination is started.

[0155] Then, the chlorination temperature was kept at 100° C., the chlorine partial pressure was kept at 0.40 MPa, and after the amount of added chlorination reached 4.0% by mass, it became 15 ppm / Hr in terms of hydrogen peroxide relative to the poly...

Embodiment 2～8、 comparative example 1～6

[0158] The average degree of polymerization of the raw material PVC, the reaction temperature, the vortex volume during stirring, the average chlorine consumption rate and the addition chlorination amount are set as Table 1 and Table 2, except that, operate in the same way as in Example 1 to obtain Chlorinated polyvinyl chloride resin.

[0159] (evaluate)

[0160] The following evaluations were performed on the chlorinated polyvinyl chloride-based resins obtained in Examples and Comparative Examples. The results are shown in Table 1 and Table 2.

[0161] (1) Pulse NMR measurement

[0162] The obtained powdery chlorinated polyvinyl chloride resin was introduced into a glass sample tube with a diameter of 10 mm (manufactured by BRUKER, model 1824511, diameter 10 mm, length 180 mm, plate bottom). The sample tube was set in a pulsed NMR apparatus ("the minispec mq20" manufactured by BRUKER Corporation), and the temperature was raised stepwise to 30°C (hold for 10 minutes), 100...

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Abstract

The present invention provides a chlorinated vinyl chloride-based resin which is prone to virtually no thermal decomposition, has excellent continuous productivity during a molding process, and can achieve both processability and unevenness preventing properties of a molded article. The present invention relates to a chlorinated vinyl chloride-based resin in which a component ratio of component C150 [component C150 / (component A150 + component B150 + component C150)] is less than 8.0%, as measured through the Solid Echo method at 150 DEG C by using pulse NMR, and as obtained by waveform-separating a free induction decay curve with respect to 1H spin-spin relaxation into three curves derived from the three components of component A150, component B150, and component C150 in order of shorter relaxation time by means of the least-squares method.

Description

technical field [0001] The present invention relates to a chlorinated polyvinyl chloride-based resin that is resistant to pyrolysis, excellent in continuous productivity during molding, and capable of both processability and unevenness prevention of molded products. Background technique [0002] Polyvinyl chloride-based resins are generally excellent in mechanical strength, weather resistance, and chemical resistance. Therefore, polyvinyl chloride-based resins are processed into various molded products and used in many fields. [0003] However, since polyvinyl chloride-based resins are poor in heat resistance, chlorinated polyvinyl chloride-based resins (CPVC) in which heat resistance is improved by chlorinating polyvinyl chloride-based resins are being developed. [0004] For example, Patent Document 1 discloses a chlorinated polyvinyl chloride-based resin obtained by a specific production method, and discloses that such a resin has little initial coloration during thermof...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/20C08F14/02C08K7/06C08K7/14C08L27/24
CPCC08F8/22C08J5/043C08J5/042C08J2327/24C08F14/06C08K7/14C08L27/24C08L2205/03C08L2205/025C09D127/24C08F114/06C08K7/06C08K5/101C08L23/04C08L51/04C08F8/20C08F14/02C08L2201/08C08L2203/30
Inventor 松村健一增野典和村上健人中岛奈未日下康成菅谷武久山县昌彦
Owner SEKISUI CHEM CO LTD
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