Polyvinyl chloride is one of the most versatile general-purpose plastics and is currently being produced and applied worldwide at a rate of 5%. The production scale of PVC in Europe is about 5.1 million tons, while its consumption is 5.4 million tons. In Germany, PVC production and consumption average 1.5 million tons. On July 1, 2006, the EU-25 enforced the Waste Electrical and Electronic Equipment Directive, known as the EU ROSH Environmental Directive, which stipulates that all electrical and electronic equipment sold in the EU market is banned or restricted to six hazardous substances. Affected by this, the overall cost of Chinese electronics manufacturers will increase by at least 10% due to new EU regulations, and export prices will increase by 15%.

At the same time, the new guidelines for phthalate produced by the European Union began to be implemented on January 16, 2007. According to the new EU standards, DEHP (dihexyl phthalate), DBP (dibutyl phthalate) and BBP (phenylbutyl phthalate) will be restricted to all children's toys and clothing and Used in PVC materials used in other articles. The corresponding DINP (diisodecyl phthalate), DIDP (diisodecyl phthalate) and DNOP (dioctyl phthalate) are also restricted to children's toys and clothing and all possible in the mouth The content of the above six ingredients shall not exceed 0.1%.

The rigid transparent medical environmentally-friendly PVC granules that we have traditionally produced use DNOP as the main plasticizer. Therefore, in order to meet the needs of the development of the world market, we have carried out the hard transparent medical environmental protection PVC granules that meet the above requirements. Development and production. The adjustment of production formula is the key to meet environmental protection and cost requirements. Jiahong Plastics R&D Department has made formula adjustments from plasticizers, stabilizers, synergists, fillers and matrix resins.

1 Formula component adjustment

1.1 plasticizer

The plasticizer used in non-environmental products is mainly DOP, and its comprehensive properties such as plasticization, compatibility, cold resistance, aging resistance, durability and migration resistance are relatively good, and the price is low. Therefore, the production of environmentally friendly granules is first. Look for suitable environmentally friendly plasticizers to replace DOP. For this reason, environmentally friendly plasticizers such as South Korea, Germany, and domestic ATBC have been tested. The results show that the imported plasticity is higher than the domestic plasticizing efficiency, the fluidity is good, the softness is good, and the strength and elongation are high. Imported environmentally friendly plasticizers have higher prices and better overall performance. Domestic environmentally friendly plasticizers are rarely produced by manufacturers, and their prices are moderate and their overall performance is slightly poor. Therefore, in the case of meeting various environmental protection requirements and physical properties, we adopt environmentally friendly plasticizers with moderate price and good comprehensive performance. The products are inspected to meet all environmental protection requirements.

1.2 stabilizer

The stabilizer for non-environmental products is mainly a composite lead salt heat stabilizer, which has good internal and external lubrication properties, improves the appearance of the product, and has fewer parts to be used. The EU ROSH environmental protection directive clearly states that the lead content should not exceed 1000ppm, so we use calcium-zinc composite stabilizer instead, which is mainly used for light color materials, excellent color stability, especially long-term color stability. But its price is high, and the lubrication performance is slightly worse, so we only have to reduce the cost through other improvements in the formula.

1.3 synergist

Although the pressure of increasing the cost of formulas using environmentally friendly materials has been alleviated by the high sales prices of environmentally friendly products, production profits are still not satisfactory. Rongwei brand new synergist is a modified material that integrates coupling agent, dispersant, internal and external lubricants, antioxidants, etc., which can optimize the activation of fillers and improve the compatibility between various components of the system. To promote ripening. In the process of processing, the filler is highly dispersed, the viscosity is lowered, and the processing fluidity is improved, and the amount of the original filler can be increased by about 30%, thereby greatly reducing the production cost, and imparting heat resistance, light resistance, anti-aging, etc. to the product. performance.

By using this hard transparent medical environmentally friendly PVC granules special synergist, based on the original 23.8% filler amount, further adjusted to 26.8% filling ratio, the performance can meet user requirements.

1.4 filler.

At the same time, we have improved the fillers and replaced some of the higher-priced light calcium with lower-cost ultra-fine calcium. However, the use of heavy calcium instead of light calcium and increased filler loading will greatly reduce physical properties, weldability, flexibility, and feel elasticity. The filler can be added by increasing the amount of synergist and adding auxiliary modifiers, as well as adjusting the formulation ratio. The dosage is increased to about 25%. The practical application shows that the appearance, weldability, hand hardness and smoothness are relatively good, and the strength and other properties basically meet the requirements.

1.5 matrix resin

The physical properties of PVC with higher degree of polymerization (especially tensile strength and tear resistance) are relatively high. Therefore, in the case of market supply permits, PVC production with higher polymerization degree should be selected as much as possible to obtain higher strength and Improve the life of the product. Jiahong Plastic uses high-quality PVC resin powder as raw material, and strictly controls the quality inspection procedure and follow-up of the incoming plant.

2 production formula

Because of its high acidity, environmentally friendly plasticizers are prone to mildew than ordinary plasticizers, especially in the case of other acidic auxiliary materials (such as synergists), so we can increase the amount of anti-fungal agents to meet the requirements. Anti-mildew effect. After a large number of experiments and actual production inspections, practical hard transparent environmentally friendly PVC granules were born in Jiahong Plastics, which are used in medical, scientific, household, toys, daily necessities, architectural decoration and packaging container industries.

3 Conclusion

Through the continuous improvement of material formula, Jiahong Plastic's hard transparent medical environmentally friendly PVC granules can meet various environmental requirements, meet various performance requirements and anti-mildew requirements, adhere to quality and customer service-oriented, production orders. Customer satisfaction is our mission!