Core Tip: PVC is one of five general-purpose plastics, its products have a wide range of uses.

However, PVC poor thermal stability shortcomings must be added when processing heat stabilizers to inhibit thermal degradation.

The commonly used heat stabilizer industry mainly inorganic lead salts, metal soaps and organic tin 11. Unfortunately, one of the large PVC is one of five general-purpose plastics, its products have a wide range of uses. However, PVC poor thermal stability shortcomings must be added when processing heat stabilizers to inhibit thermal degradation. The commonly used heat stabilizer industry mainly inorganic lead salts, metal soaps and organic tin 11. Unfortunately, most of these varieties are toxic. This not only limits the application of PVC products, but also harm their use on the environment and labor health positive with continued growth in the production of PVC products rapidly deepened. To protect the environment and improve working conditions for health, improve the competitiveness of the PVC industry's urgent need to promote the use of research and development and industrial application of non-toxic heat stabilizer to replace the traditional toxic species. Stearate RE is a new non-toxic heat stabilizer, on its properties and applications have been reported to experience stabilizer 3. Preparation of test panels: according to the formula will be on an open chain presses at 160 ° C after molding and kneading ingredients evenly refining 5min then vulcanizing machine pressed into 3mm thick test blackboard.

Blooming test: the test plate in a 5% aqueous solution of calcium chloride in the 60C until no further increase in whiteness spray.

The test with the standard blackboard blackboard blackboard spray whiteness than the quasi-added by different amounts based on the recipe (PVC 50, tribasic lead sulfate 1, black 1) stearate prepared. Table of correspondence between the bloom and the standard Blackboard Content stearate 3. Table 3 blooming of correspondence between the standard Blackboard Content stearate blooming degree / grade stearic acid content /% 2 Results and discussion 2.1 Characteristics 2.1 measurement results of the thermal stability test .1 thermal stability RETM and RESt alone as PVC heat stabilizers shown in table 4. table when the heating time 4RETMRESt thermal stability when used alone yellowish pale yellow yellow orange orange orange brown light brown light brown brown brown brown dark brown dark brown dark brown dark brown Note: the thermal stabilizer in an amount of 1 part can be seen from the results in table 4, RETM similar RESt, heat aging test piece which produce colored early, but after a long time, but after heating thermal stabilization feature does not appear black, that is, long-term thermal stabilizer. On the other hand, compared with RESt, RETM stable specimen heated lighter color, which has a strong ability to inhibit RETM PVC colored.

RETM exhibit such thermal stability characteristics may be due to both a weak acid (like RESt) also has dienophile reagent structure (unlike RESt, similar organic tin maleate), and therefore both absorb HCl function, but also while blocking its growth to a certain extent occurs DielsAlder reacted with polyene segment PVC chain, thus eliminating the long-term thermal stabilizer by and with the initial thermal stability REIM, RESt and ZnSt and use, the thermal stability improving agent given in Table inhibitory effect of coloring PVC. The thermal stability of the heating time 5. Table 5RETM, RESt and ZnSt with time / min colorless yellowish orange light yellow orange brown dark brown yellow light yellow yellow brown brown brown brown black black orange orange Note: RESt, RESt in an amount of 1 part , ZnSt an amount of 005 parts.

Shihai early presence of yellowish coloration, the specimen is heated 100min namely blackening; and 1 part REIM and 0.05 parts ZnSt can effectively inhibit the initial coloring, blackening more than 100min can be seen from the above results, REIM has a higher ratio of RESt thermal stability performance.

The measurement results 1.2 transparent sheet of transparent experiment are shown in Table 6. Table 6 thermal stabilizer transmittance / haze% /% Note: The thermal stabilizer in an amount of 1 part 2.1.3 Analysis of pressure, heat stabilizers blooming characteristic analysis of pressure degrees /% of blooming /% As can be seen from table 7, REIM Unlike conventional metallic soap CdSt (pressure analysis but large blooming small) and ZnSt (pressure analysis blooming small but big) and RESt- like pressure analysis and blooming were small.

2.2 Application of the above research, the author has recently developed a new non-toxic composite heat stabilizer series consists REIM composition, compared with the non-toxic composition RESt composite heat stabilizer (RHS- 25), the performance characteristics of a price better application a wider range, not only applicable to a soft, semi-hard and can be used in PVC products processing. The new series of non-toxic type of composite heat stabilizer and its characteristics are shown in Table 8. Table 8 new non-toxic compound heat stabilizer Models and Features Model Appearance functional scope of application Dosage pale yellow slurry was heat stabilized, lubricated transparent soft (semi-hard) quality products alone white powder moist heat stabilized, lubricated opaque soft (semi-hard) products alone white powder moist heat stabilized, lubricated, soft foam foaming aid (semi-hard) to use the series of new products alone in some products have been tested in the factory of toys, tube, film, shoes, miscellaneous items and other products processing, because of good overall performance, easy to use, can obtain high-performance, non-toxic products, and it helps to reduce production costs by the users sure.

3、Conclusions and transparency above rare earth stearate (RESt), and press out and Blooming with RESt- sample are small; compared with non-toxic composite heat stabilizer made RESt composed of new non-toxic compound formed by the RETM price performance characteristics of a heat stabilizer better, wider range of applications, not only applicable to a soft, semi-hard and can be used in PVC products processing.