Rare earth and calcium and zinc stabilizer for polychlorovinyl and its preparation

Abstract

Rare-earth and calcium and zinc stabilizing agent for polyethylene is produced by treating rare-earth and calcium and zinc compounds with surface modifying agent, and optimizing with polyethylene and anti-oxidating agent or / and organic tin compounds or organic phosphonite compounds or / and C8 - C22 metal saponified materials of calcium or zinc or magnesium or aluminum or / and ultraviolet absorber or / and urate or / and polyhydroxy esterified materials or / and polyethylene lubricant to be obtained. It has high quality and no toxicity, is produced with low cost and in a simple process.

Description

technical field [0001] The invention relates to a rare earth metal stabilizer for synthetic resins, in particular to a rare earth metal stabilizer for polyvinyl chloride resins and a preparation method thereof. Background technique [0002] There are three types of stabilizers for PVC processing: (1) heavy metal compound stabilizers, including lead, cadmium, etc., such stabilizers have high stabilization efficiency, but are highly toxic, have serious vulcanization pollution, and have poor weather resistance; 2) Light metal compound stabilizers, including calcium, zinc, magnesium and aluminum compounds, etc. Although these stabilizers are non-toxic, they have poor stabilization performance and poor original colorability of objects. The synthesis process of calcium zinc compounds is based on organic acids or esters , soluble calcium or zinc salt as the main indirect method, that is, the saponification synthesis process, the equipment efficiency of th...

AI Technical Summary

Problems solved by technology

[0002] There are three types of stabilizers for PVC processing: (1) heavy metal compound stabilizers, including lead, cadmium, etc., such stabilizers have high stabilization efficiency, but are highly toxic, have serious vulcanization pollution, and have poor weather resistance; 2) Light metal compound stabilizers, including calcium, zinc, magnesium and aluminum compounds, etc. Although these stabilizers are non-toxic, they have poor stabilization performance and poor original colorability of objects. The synthesis process of calcium zinc compounds is based on organic acids or esters , soluble calcium or zinc salt as the main indirect method, that is, the saponification synthesis process, the equipment efficiency of this synthesis process is low, the process flow is long, there are many intermediate links, the product quality is not easy to control, the operating cost is high, and the soluble salt used in the raw material And the impurity elements brought by the alkali in the saponification are easy to remain in the product, directly affecting the quality and stability of the product, and a large amount of waste water is discharged during the production process, polluting the environment; (3) rare earth compounds, light rare earths are non-toxic, tasteless, radioactive, and Small, low price, especially its special atomic structure has great advantages as a stabilizer, but a large number of experiments and applications have proved that although pure rare earth compounds have excellent long-term stability, they have poor initial coloring properties and cannot be used alone as the main stabilizer. The stabilizer is used, and it needs to be used with other synergistic additives

The Chinese invention patent application with the application number 00117157.7 "a rare earth multifunctional composite stabilizer for PVC and its process method" discloses a rare earth compound and antioxidant or / and calcium stearate or / and stearic acid Rare earth composite stabilizer for PVC and its process method, which are optimized and compounded by effective substances such as zinc or / and barium stearate or / and lubricant or / and basic lead salt or / and lead stearate, but There are still some heavy metals in the composition of this rare earth composite stabilizer, which is not a completely environmentally friendly substance. In addition, in the stabilizer compounding process, the production process only mentions the use of simple physical and mechanical mixing methods to mix various raw materials with different properties. Putting it into the kneader for mixing will cause the mixed materials to be easily separated during the production and storage process, thus affecting the uniformity of the product. It is manifested that the product often fluctuates during the PVC processing process, and the product precipitates seriously during the processing and application process. , the processing cycle is short, so the yield of PVC products decreases, and the maintenance workload of equipment and molds is heavy