High-toughness and high-heatproof glass fiber reinforced PBT (Polybutylece Terephthalate) composite material and preparation method thereof

A composite material, high heat-resistant technology, applied in the field of high heat-resistant glass fiber reinforced PBT composite material and its preparation, high toughness, can solve the problem of high cost, complex alloy material processing, material mechanical properties and thermal properties need to be further improved, etc. problem, to achieve the effect of improving thermal performance, improving toughness and increasing crystallinity

CN103709681AInactive Publication Date: 2014-04-09SHANGHAI SUNNY
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2014-04-09
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a high-toughness and high-heatproof glass fiber reinforced PBT (Polybutylece Terephthalate) composite material and a preparation method thereof. The composite material is prepared from the following raw materials in parts by weight: 100 parts of PBT, 5-10 parts of reactive impact modifier, 3-5 parts of nucleating agent, 15-30 parts of glass fiber and 0.5-1 part of processing aid, wherein the reactive impact modifier is a compound of a toughening agent with reactive groups and a PBT thickening agent, and the mass ratio of the toughening agent with the reactive groups to the PBT thickening agent is (3:2)-(4:1). Compared with the prior art, the high-toughness and high-heatproof glass fiber reinforced PBT composite material has the advantages that the reactive impact modifier is prepared by compounding the PBT thickening agent and the toughening agent with the reactive groups, and the super-toughening of the PBT material is realized through reactive blending extrusion from the perspectives of a molecular chain and the external toughening of a reactive toughening agent. PBT crystal grains can be refined through the introduction of the nucleating agent, so that the toughness of the material is improved; and meanwhile, the nucleating agent plays a heterogeneous nucleation role, so that the crystallinity of PBT can be increased, and furthermore, the thermal property is greatly improved.
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Description

technical field

[0001] The invention relates to a PBT composite material and a preparation method thereof, in particular to a high toughness and high heat-resistant glass fiber reinforced PBT composite material and a preparation method thereof. Background technique

[0002] Polybutylene terephthalate (PBT) is a semi-crystalline thermoplastic engineering plastic, which has excellent mechanical properties, electrical properties, heat resistance, etc., and is widely used in automobiles, electronics, electrical appliances and other industries. PBT has good molecular chain flexibility, fast crystallization, and excellent molding processability compared with polyethylene terephthalate (PET). However, the low notched impact strength of PBT is a major defect that limits its application as engineering plastics.

[0003] At present, most of the research work is focused on the toughening of PBT composites simply by using elastomer blending or reactive functional group grafted elastome...

Examples

Embodiment 1

[0025] A high-toughness, high-heat-resistant glass fiber reinforced PBT composite material is made of the following components and raw materials in parts by weight:

[0026]

[0027] Among them, the intrinsic viscosity of PBT is 0.9 dL / g.

[0028] The reactive impact modifier is a composite of the toughening agent EPDM-g-GMA with reactive groups and the PBT tackifier pyromellitic dianhydride, and the composite weight ratio is 3:2. The introduction of the toughening agent EPDM-g-GMA with reactive groups increases the binding ability of EPDM-g-GMA to the matrix on the one hand, and improves the dispersion of EPDM-g-GMA in the matrix on the other hand. Pyrellitic dianhydride improves the toughness of the material from the molecular weight level, and the impact performance of the material is greatly improved through the combination of the two.

[0029] The nucleating agent is talc powder, and the molecular chain of PBT is flexible, so the low-temperature growth ability of the ...

Embodiment 2

[0036] A high toughness, high heat-resistant glass fiber reinforced PBT composite material, the composite material is made of the following components and raw materials in parts by weight:

[0037]

[0038] The intrinsic viscosity of PBT is 1.05dL / g.

[0039] The reactive impact modifier is a compound of a toughening agent LLDPE-g-MAH with a reactive group and a PBT tackifier bisoxazoline-based benzene, and the composite weight ratio is 4:1. The introduction of the toughening agent LLDPE-g-MAH with reactive groups increases the binding ability of LLDPE-g-MAH and the matrix on the one hand, and improves the dispersion of LLDPE-g-MAH in the matrix on the other hand. Oxazoline-based benzene improves the toughness of the material from the molecular weight level, and the impact performance of the material is greatly improved through the combination of the two.

[0040] The nucleating agent is calcium carbonate, and the molecular chain of PBT is flexible, so the low-temperature ...

Embodiment 3

[0047] A high toughness, high heat-resistant glass fiber reinforced PBT composite material, the composite material is made of the following components and raw materials in parts by weight:

[0048]

[0049] The intrinsic viscosity of PBT is 1.0dL / g.

[0050] The reactive impact modifier is a composite of the toughening agent POE-g-MAH with reactive groups and the PBT tackifier pyromellitic dianhydride, and the composite weight ratio is 3:1. The introduction of POE-g-MAH, a toughening agent with reactive groups, increases the binding ability of POE-g-MAH to the matrix on the one hand, and improves the dispersion of POE-g-MAH in the matrix on the other hand. Pyrellitic dianhydride improves the toughness of the material from the molecular weight level, and the impact performance of the material is greatly improved through the combination of the two.

[0051] The nucleating agent is nano-montmorillonite, and the molecular chain of PBT is flexible, so the low-temperature growth a...