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Polyethylene terephthalate composite material and preparation method thereof

A technology of polyethylene terephthalate and composite materials, which is applied in the field of composite materials, can solve the problems of PET molecular weight reduction, mechanical property degradation, PET molecular chain breakage, etc., to improve wettability, increase crystallization rate, and improve Effect of crystallization rate

Active Publication Date: 2017-07-11
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while the transesterification reaction increases the interfacial cohesion between the nucleating agent and the PET matrix and promotes crystallization, it also causes the breakage of the PET molecular chain, resulting in a decrease in the molecular weight of PET and deterioration of its mechanical properties.

Method used

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  • Polyethylene terephthalate composite material and preparation method thereof
  • Polyethylene terephthalate composite material and preparation method thereof
  • Polyethylene terephthalate composite material and preparation method thereof

Examples

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preparation example Construction

[0028] The preparation method of polyethylene terephthalate composite material of the present invention may further comprise the steps:

[0029] Step 1, mixing 1 to 5 parts by weight of dried polyhedral oligosilsesquioxane and 100 parts by weight of dried polyethylene terephthalate in a high-speed mixer to obtain a mixed material;

[0030] Step 2, adding the mixed material into a twin-screw extruder, extruding at 220-260°C, cooling the obtained strands with water, and granulating with a pelletizer to obtain pellets;

[0031] Wherein, there is no special limitation on the size of the strips and pellets, and they can be prepared according to the requirements of extrusion molding in the prior art;

[0032] Step 3, drying the pellets at 100-140°C until the moisture content is below 0.02%, to obtain a polyethylene terephthalate composite material;

[0033] Wherein, there is no lower limit for the moisture content after drying, and it can be determined as required.

[0034] The PO...

Embodiment 1

[0044] Polyethylene terephthalate composite material, by the drying of 100 parts by weight of PET and 1 part by weight of T 8 Type POSS composition, among them, the T with two carboxyl groups 8 The structural formula of type POSS is as follows:

[0045]

[0046] The preparation of above-mentioned polyethylene terephthalate composite material:

[0047] The above-mentioned 1 part by weight of T 8 Type POSS and 100 parts by weight of dried PET are put into a high-speed mixer and mixed evenly to obtain a mixed material, and then the mixed material is added to a twin-screw extruder and extruded at 220-260 ° C After the strips are cooled by water, they are granulated by a granulator, and the obtained granules are dried at 140° C. until the moisture content is less than 0.02%, to obtain polyethylene terephthalate composite materials.

[0048] The molecular weight of the polyethylene terephthalate composite material obtained in Example 1 is detected by gel chromatography, and th...

Embodiment 2

[0050] Composite polyethylene terephthalate consisting of 100 parts by weight of oven-dried PET and 2 parts by weight of oven-dried T 10 Type POSS composition, wherein, T with four epoxy groups 10 The structural formula of type POSS is as follows:

[0051]

[0052] The preparation of above-mentioned polyethylene terephthalate composite material:

[0053] The T with four epoxy groups of the above-mentioned 2 parts by weight of drying 10 Type POSS and 100 parts by weight of dried PET are put into a high-speed mixer and mixed evenly to obtain a mixed material, and then the mixed material is added to a twin-screw extruder and extruded at 220-260 ° C After the strips are cooled by water, they are granulated by a granulator, and the obtained granules are dried at 140° C. until the moisture content is less than 0.02%, to obtain polyethylene terephthalate composite materials.

[0054] Detect the molecular weight of the polyethylene terephthalate composite material obtained in Ex...

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Abstract

The invention discloses a polyethylene terephthalate composite material and a preparation method thereof, belonging to the technical field of composite materials. The invention solves the technical problems of low crystallization rate of polyethylene terephthalate in the prior art, reduction of molecular weight and deterioration of mechanical properties after modification with a nucleating agent. The polyethylene terephthalate composite material of the present invention comprises polyhedral oligomeric silsesquioxanes of 100 parts by weight of dried polyethylene terephthalate and 1 to 5 parts by weight of dried polyhedral oligosilsesquioxanes, Among them, the polyhedral oligomeric silsesquioxane contains one or two of carboxyl groups and epoxy groups, and the total number of carboxyl groups and epoxy groups is more than two. The crystallinity of the composite material can reach 30.2-33.9%, the semi-crystal period can reach 1.1-2.1s, the tensile strength is 62-76MPa, and the notched impact strength is 2.8-4.5kJ / m 2 , heat distortion temperature is 79 ~ 92 ℃.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a polyethylene terephthalate composite material and a preparation method thereof. Background technique [0002] Polyethylene terephthalate (PET) is widely used in textiles, packaging materials, electronic appliances and other daily life due to its mature production process, good heat resistance, solvent resistance, high strength, and low cost. Production of supplies. However, due to the insufficient toughness and slow crystallization rate of PET, the current application in the machinery manufacturing and construction industries is still quite limited. On the one hand, the slow crystallization rate of PET will prolong the molding cycle and molding cost of PET products. On the other hand, it will cause the product to form an amorphous area inside due to incomplete crystallization, resulting in PET products that cannot be widely used in engineering applicati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08K5/549
Inventor 尹园杨天博柳美华魏巍郑春柏邓鹏飏
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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