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Toughening nylon main controlling factors of the manufacturing process

by:CSSSLD     2021-01-23
Blend 'long rate increased with the increase of elastomer, impact strength and elastomer content relationship, the impact strength of the binary system is proportional to the content of elastomer. To the different system, different elastomers, different PA matrix, the effect of elastomer is different, so the usage is different also. When determining the dosage of elastomer, therefore, should consider to use the needs and requirements. Generally speaking, the elastomer is unfavorable and exorbitant, otherwise solve the toughness and rigidity decline, and surface properties, injection molding processing performance, molding shrinkage, deformation, and many other problems.

elastomer particle size control is mainly determined by the shear strength and dosage. In general, the shear strength, particle size is small, but no matter how big the shear strength is not broken to the molecular state. Elastomer to join more than one volume fraction, grain size increases with the increase of dosage. For most of the blend, when the dosage of two components of 50/50, blend in two phase structure in a row, with the increase of the content of dispersed phase particles of dispersed phase is broken into smaller particles at the same time, also occur between particles coalescence.

toughening nylon manufacturing process, toughening agent type, the degree of mixing, dispersion and compatibility of the elastomer in PA degree and blending process conditions on the toughening effect produce very big effect. Toughening effect is mainly decided by the performance of toughening agent itself. Toughening agent itself is the structure and performance of the toughening effect of the key factors. Toughening agent of different structure, especially under the low temperature of the elastic difference is very big.

EPDM, POM showed very good toughening effect, at the same time, low temperature toughness of grafted PE toughening PA66 is better. The choice of the elastomer: has good compatibility with nylon, melt flow rate and nylon close, in the melt blending temperature, does not decompose, in accordance with the requirements of USES, use more groups or single-component elastomer. Elastomer dosage had a great influence on mechanical properties of the PA, the elastomer with 10%, the toughening effect is not very obvious. Increased dosage exceeds 10%, elastomer, toughening blending impact strength to rise significantly, but the tensile and bending strength decreased obviously.

elastomer were divided into two types: one kind is easy crosslinked elastomers, another kind is difficult crosslinked elastomers. Using the former is grafted rate control in 0. 3% - 0. The latter grafting rate can be controlled within 6% in 0. 5% - 1. Within 5%. Different particle size and distribution of different toughening effect of different binders on the elastomer particle size and distribution of demand is not the same, for PA, elastomer particle size control in 0. 2 - 0. 5 range is more appropriate.

when flexibilizer viscosity increases, the molten liquid, the injection molding processing and the dispersion of the nylon substrate is poor. After the SBS grafted MAH, toughening effect is higher than the SBS, it should be pointed out that different systems of law are not the same. In theory, the higher the elastomer grafting rate is beneficial to improve the ability of reaction with PA, is helpful to improve the effect of toughening. But as a result of grafting reaction process with macromolecular crosslinking reaction, the cross connected to a certain extent, have keep blending effect such as rigid body, but if too much crosslinking toughening effect is lost.

elastomer or elastomer graft copolymer blend with nylon, can react with nylon, effectively improve the impact strength of blend body, that toughening agent improved the compatibility with nylon after grafting. Graft copolymer grafted rate larger influence on toughening effect. Grafting rate is too small, poor toughening effect, grafting rate is too large, the toughening effect is not ideal. Grafting rate too hours, reaction with nylon flexibilizer molecules in groups, system is a complete state of phase separation. Grafting rate is too large, lead to macromolecular crosslinking, especially elastomer grafting reaction process, under certain conditions, crosslinking reaction speed is greater than the grafting reaction, crosslinking reaction is the result of the system viscosity increased.

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