Formulation design of PVC foam board

Formulation design of PVC foam board
PVC shoes products have both foaming and non-foaming, molding and molding of two different processing methods, basically the same but the main design principle of the formula.
1, PVC resin: SG-2, 3-type resin, also using SG-4,-5, this largely depends on the shoe product performance requirements. Index for PVC resin, General requirements bulk density is slightly smaller, plasticizer absorption per high, less fish-eye, particle size uniformity.
2 plasticizers, PVC foam board: Add larger amounts, usually in the 60~80PHR, mainly to DOP, DBP, appropriately equipped with DOS dihexyl and cheap oil ester and chlorinated paraffin. Sometimes depending on your needs, environmental classes such as citric acid ester plasticizers are also used.
3, stabilizer: opaque products primarily dominated by lead salt composite stabilizer, or three salt, salt supplemented the second metal SOAP. Organic Tin and products more transparent to CA-Zn composite heat stabilizer. According to the different varieties, add vary greatly.
4, lubricants: stearic acid and paraffin, or polyethylene wax oxidized polyethylene wax can also be used.
5, foaming agent: for products that require foam, foaming agent is a must. Commonly used foaming agent is azo dimethyl formamide (AC blowing agent), injection molded foam products amounts to 0.5~1.0PHR, molded foam products for 5~6PHR.
6, zhuguangsu: pearled Sandals formula needs to add a Pearlescent pigment. Pearl Pearl and Pearl powder mixture in two ways. B605 Pearlescent powder, chemical names are bismuth oxychloride, BiOCl, is a bismuth carbonate salt synthesis under certain conditions, has strong refractive power, and PVC mixed, good dispersion, high coverage, is not easy to break down plastic forming process and plastic pearls Rainbow Luster on the surface, increasing product appearance. Pearl paste frequently used P35 synthesis is the brand of candles, and it is lead carbonate particles, butyl-acetate and nitrocellulose DBP as dispersant made of jelly.