Method for producing super-white polyvinyl chloride resin through vinyl chloride suspension polymerization after-treatment
A technology of polyvinyl chloride resin and suspension polymerization, which is applied in the field of ultra-white polyvinyl chloride resin after vinyl chloride suspension polymerization to achieve easy dispersion, good fluidity, and good whitening effect
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Embodiment 1
[0015] A method for producing ultra-white polyvinyl chloride resin after suspension polymerization of vinyl chloride. According to the mass ratio, 15 parts of absolute ethanol, 2 parts of liquid carbolic acid, 4 parts of "acid blue 90" and 400 parts of water are used to prepare whitening aids ;In the range of 0-80°C, according to the volume ratio, the whitening aid is diluted for dispersion, and each part of the whitening aid is added to 200 times the volume of deionized water, and stirred at a speed of 20-80 r / min for 1 minute, In the SG3 type resin slurry, dilute the auxiliary agent at 1.6L / m 3 slurry, add dilution aid to the stripped slurry and stir evenly. After centrifugation at a speed of 1500-2000r / min and drying at 60°C for 10-15 minutes, the initial whiteness of the product was sampled and tested to be 93.2%, and the aging whiteness of the product tested according to the national standard GB5761 was 88.4%. The initial whiteness of the same batch of samples without po...
Embodiment 2
[0017] A method for producing ultra-white polyvinyl chloride resin after suspension polymerization of vinyl chloride. According to the mass ratio, 15 parts of absolute ethanol, 2 parts of liquid carbolic acid, 5 parts of "acid blue 74" and 500 parts of water are used to prepare whitening aids , dilute 200 times with deionized water to prepare dilution aid.
[0018] In the SG5 type resin slurry, dilute the auxiliary agent by 2L / m 3 slurry, add dilution aid to the stripped slurry and stir evenly. After centrifugation at a speed of 2000r / min and drying at 60°C for 15 minutes, the initial whiteness of the product was sampled and tested to be 94.2%, and the aging whiteness of the product tested according to the national standard GB5761 was 88.3%. The initial whiteness of the same batch of samples without post-treatment of whitening additives is 92.5%, and the aging whiteness of GB5761 is 86.5%.
Embodiment 3
[0020] A method for producing ultra-white polyvinyl chloride resin after suspension polymerization of vinyl chloride, comprising 15 parts of absolute ethanol, 2 parts of liquid carbolic acid, 6 parts of "acid blue 5", and 600 parts of water to configure whitening aids according to the mass ratio, Prepare dilution aid by diluting 200 times with deionized water.
[0021] In the SG8 type resin slurry, dilute the auxiliary agent at 2.4L / m 3 slurry, add dilution aid to the stripped slurry and stir evenly. After centrifugation and drying, the initial whiteness of the product is 93.8% according to the sampling test, and the aging whiteness of the product is 88.3% according to the national standard GB5761. The initial whiteness of the same batch of samples without post-treatment of whitening additives is 92.2%, and the aging whiteness of GB5761 is 86.7%.
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