Method for improving ageing whiteness of vinyl chloride resin
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A technology of polyvinyl chloride resin and vinyl chloride monomer, applied in the field of preparation of polyvinyl chloride resin, can solve the problems of improving aging whiteness and the like
Inactive Publication Date: 2010-06-16
SHANGHAI CHLOR ALKALI CHEM
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Problems solved by technology
[0003] The technical problem to be solved in the present invention is to provide a method for improving the aging whiteness of polyvinyl chloride resin, so as to overcome the defect that it is difficult to improve the aging whiteness of polyvinyl chloride resin existing in the prior art
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Embodiment 1
[0026] Add water, dispersant, vinyl chloride monomer, anti-fisheye agent tert-butylhydroquinone and initiator into the polymerization reactor, and the ratio of parts by weight is:
[0028] The weight ratio of pH regulator and antioxidant is:
[0029] pH regulator: antioxidant=1:2;
[0030] Ammonium bicarbonate is that the solution that weight concentration is 6% adds;
[0031] The reaction temperature is 56.8°C. After 5 hours of polymerization reaction, an antioxidant is added into the polymerization kettle along with the terminator to obtain a polyvinyl chloride resin.
[0032] Dispersant is the mixture of polyvinyl alcohol (KH20) and hydroxypropyl methylcellulose (being called for short HPMC) produced by Japanese synthetic chemical company, and the weight ratio is 1: 0.68;
[0033] The initiator is bis(2-ethyl)hexyl...
Embodiment 2
[0036] Adopt the same method as embodiment 1, wherein:
[0037] Vinyl chloride monomer 1000 parts
[0038] 1500 parts of water
[0039] Dispersant 0.35 parts
[0040] Initiator 0.25 part
[0041] Anti-fish eye agent 0.7 parts
[0042] pH adjuster 0.015 parts
[0043] 0.3 parts of terminator;
[0044] The weight ratio of pH regulator and antioxidant is: pH regulator: antioxidant=1: 1.76;
[0045] Ammonium bicarbonate is that the weight concentration is that the solution of 10% adds;
[0046] The standard of GB / T 15595 is used to test, the whiteness of polyvinyl chloride resin products can reach an average of 79 or more, the particle size of the resin particles is relatively coarse, and the particle size distribution is relatively concentrated.
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Abstract
The invention provides a method for improving ageing whiteness of vinyl chloride resin. The method comprises the following steps: adding water, dispersing agent, vinyl chloride monomer, initiator, fisheye resisting agent and pH regulator in a reaction kettle for polymerization, and adding terminator and antioxidant in the reaction system simultaneously to obtain vinyl chloride resin, wherein the pH regulator is ammonium hydrogen carbonate, the antioxidant is imperfectly hindered phenol chain terminator antioxidant, the weight ratio of pH regulator to antioxidant is 1:1.76-2. In the inventive method, the resin particle size distribution width is lowered, resin particle shape is more regular, the heat resistance of the produced vinyl chloride resin is enhanced, the ageing whiteness index is obviously improved, and inherent quality of resin is enhanced. The polymerization in the production process is stable, quality repeatability of resin of each batch is good, and the new aid adopting composite preparation method can be applied in cauldron industrialized production.
Description
technical field [0001] The invention relates to a preparation method of polyvinyl chloride resin, in particular to a method for improving the aging whiteness of the product in the production process of polyvinyl chloride resin. Background technique [0002] In the production of polyvinyl chloride resin, in order to obtain higher quality polyvinyl chloride resin products, for example, polyvinyl chloride resin is required to have a higher aging whiteness, and the resin is required to have excellent plasticizing properties, it is necessary to improve the production method, Use new additives. Most of the existing production processes only use sodium hydroxide solution in the later stage of the reaction to stabilize the pH value of the polymerization system, and then add a terminator to terminate the reaction, which has a poor effect on improving the aging whiteness of the product. Contents of the invention [0003] The technical problem to be solved in the present invention i...
Claims
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Application Information
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