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Flame-retardant polyester resin composition, molded article thereof, and method of molding the same

A flame retardant and composition technology, applied in the field of flame retardant polyester resin compositions, can solve the problems of difficulty in fluidity and retention stability, insufficient molding conditions, and productivity obstacles.

Inactive Publication Date: 2002-10-30
TEIJIN LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, any of brominated epoxy compound blended polyester resin and brominated acrylate blended polyester resin has a problem of viscosity fluctuation related to the above-mentioned retention, which is related to fluctuations in molding conditions when recycled materials are used, and hinders productivity.
[0009] Thus, in the prior art, the use of high-molecular-weight brominated epoxy compounds will reduce the fluidity of the resin, and the use of low-molecular-weight brominated epoxy oligomers will not improve the retention stability of the composition. It is difficult to have both fluidity and retention stability
[0010] Therefore, when using brominated epoxy compounds for flame retardancy, it is effective to some extent to use polymers with a small amount of terminal carboxyl groups that react with epoxy groups as polyester resins, but it is still necessary to adapt to wider molding conditions. not enough

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6 and comparative example 1～8

[0078] 2600 parts by weight of dimethyl terephthalate, 1800 parts by weight of 1,4-butanediol and 1.9 parts by weight of n-tetrabutyl titanate were added to the transesterification reaction tank, and the transesterification reaction was carried out at 170°C for 180 minutes. The methanol distilled in the reaction is discharged outside the reaction system to complete the transesterification reaction. The amount of methanol distilled off when the reaction was completed was 740 parts by weight. Next, in order to carry out the polycondensation reaction, the reaction solution was moved to a polycondensation reaction tank, and the reaction temperature was raised from 170° C. to 245° C. over 35 minutes while gradually increasing the degree of vacuum. Keeping this temperature and keeping the vacuum at ≤ 1mmHg, the condensation reaction was continued to produce poly-1,4-butylene terephthalate (PBT) resins A1 and A2. Thereafter, the pressure was returned to normal pressure under nitroge...

Embodiment 7 and comparative example 9

[0088] Using the components (compositions) described in Table 3, pellets for molding were produced in the same manner as described in Examples 1 to 6. The pellets were sent to the retention test described in Table 3, and the change in intrinsic viscosity of the resulting molded product was measured. The results are shown together in Table 3.

[0089] Composition (parts by weight)

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PUM

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Abstract

A flame-retardant composition comprising (A) 100 parts by weight of an aromatic polyester having a terminal carboxyl group concentration of 60 equivalents / ton or less; (B1) a specific brominated epoxy compound and (B2) a brominated polyacrylate in the amount of 5 to 50 parts by weight; (C) 2 to 20 parts by weight of antimony trioxide, and the (B1) / (B2) weight ratio being 5 / 95 to 95 / 5. The composition has superior excellent residence stability than a composition used for a brominated epoxy compound alone as a flame retardant.

Description

technical field [0001] The present invention relates to a flame-retardant polyester resin composition, its molded product and its molding method, and more specifically, to a flame-retardant polyester resin composition having excellent heat resistance, flame retardancy, and moldability, and its Molded article and molding method thereof. Background technique [0002] Polyester resins have been widely used in electrical and electronic parts, automotive parts, mechanical parts, etc. due to their excellent heat resistance, mechanical properties, and chemical resistance. However, flame retardancy is also strongly required from the viewpoint of fire safety in the use of electrical and electronic components, and compositions containing a flame retardant are used for this purpose. [0003] As flame retardants for polyester resins, brominated polycarbonate oligomers and brominated epoxy oligomers have been studied. The ester resin composition is also required to have good molding pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L33/16C08L63/00C08L67/02
CPCC08L33/16C08L63/00C08L67/02C08L2666/02C08L33/00
Inventor 弘中克彦
Owner TEIJIN LTD