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Polyester self-nucleating agent as well as preparation method and application thereof

A self-nucleating, polyester technology, applied in the field of resin materials, can solve the problems of PET molecular weight reduction, high price of trifluoroacetic acid, strong volatility and corrosion, etc., achieve rapid crystallization ability, do not cause molecular weight drop, and promote crystallization Effect

Active Publication Date: 2017-05-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the solvent trifluoroacetic acid used in this method is expensive, and its volatility and corrosiveness cause poor practicability, and strong acidity will also cause the molecular weight of PET to decrease, thereby affecting mechanical properties. Its tensile strength is only 23Mpa, and Excessively high addition amount (5wt%) does not promote the crystallization of PET well under the condition of rapid cooling (≥40°C / min)
Therefore, using the trifluoroacetic acid / acetone system to directly change the ethyl configuration in the PET molecular chain from the amorphous side structure to the trans structure to improve its crystallization performance is difficult to be widely used.

Method used

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  • Polyester self-nucleating agent as well as preparation method and application thereof
  • Polyester self-nucleating agent as well as preparation method and application thereof
  • Polyester self-nucleating agent as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] A kind of PET self-nucleating agent that can crystallize rapidly, its preparation process is as follows:

[0059] (1) Set the intrinsic viscosity to 0.82dL·g -1 The PET1 resin was dissolved in phenol / tetrachloroethane mixed solvent to obtain a PET solution with a concentration of 0.06g / mL. In the phenol / tetrachloroethane mixed solvent, the mass ratio of phenol to tetrachloroethane was 3:2 ;

[0060] (2) at a stirring speed of 600rpm, the PET solution obtained in step (1) is added in acetone to obtain a mixture containing a white precipitate, and the volume ratio of the acetone precipitating agent to the PET solution is 3:1;

[0061] (3) The mixture containing the white precipitate obtained in step (2) is subjected to vacuum suction filtration to obtain a white precipitate; the white precipitate is washed with acetone and distilled water in turn, and then vacuum-dried at 60°C to constant weight to obtain a molecular chain in the form of Kink The conformation-based PET ...

Embodiment 2

[0063] A kind of PET self-nucleating agent masterbatch that can crystallize rapidly, its preparation process is as follows:

[0064] (1) The PET self-nucleating agent (PT / A-PET1) obtained in Example 1 and the intrinsic viscosity are 0.69dL·g -1 The PET2 resin was blended in a Brabender torque rheometer, the temperature of the rheometer was 275°C, the rotation speed was 80r / min, the blending time was 5min, and the dosage of the PET self-nucleating agent was 5wt% of the PET2 resin mass ;

[0065] (2) Dry the blend obtained in step (1) to a constant weight in a vacuum oven at 60°C to obtain a PET self-nucleating agent masterbatch containing 5wt% PT / A-PET1, denoted as PT / A-PET1 The properties of PET masterbatch are shown in Table 1.

Embodiment 3

[0067] A kind of application of the PET self-nucleating agent prepared by embodiment 1:

[0068] (1) The PET self-nucleating agent (PT / A-PET1) obtained in Example 1 and the intrinsic viscosity are 0.69dL·g -1 The PET2 resin was blended in a Brabender torque rheometer, the temperature of the rheometer was 275°C, the rotation speed was 80r / min, the blending time was 5min, and the dosage of the PET self-nucleating agent was 1wt% of the PET2 resin mass ;

[0069] (2) Dry the blend obtained in step (1) to a constant weight in a vacuum oven at 60° C. to obtain a modified PET polyester containing 1 wt % PET self-nucleating agent (PT / A-PET1). It is 1% PT / A-PET1+PET2, and its properties are shown in Table 1.

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Abstract

The invention discloses a polyester self-nucleating agent as well as a preparation method and application thereof. A dissolution-precipitation method is adopted. The preparation method comprises the following steps: firstly dissolving polyethylene dicarboxylate resin in a phenol / tetrachloroethane mixed solvent, chloroform, dichloromethane, tetrachloroethane, xylene, benzene, nitrobenzene, dioxane, o-chlorophenol, m-cresol or a decahydronaphthalene solvent, then precipitating out in acetone and converting an ethylene glycol structure unit in a polyester resin molecular chain into easy-to-crystallize Kink conformation through amorphous gauche conformation to obtain the polyester self-nucleating agent. The polyester self-nucleating agent is Kink conformation-based polyester resin, has rapid crystallization capacity, can be directly taken as a self-nucleating agent for the polyester resin, can also be blended with the polyester resin to form crystallization master batches firstly and then be taken as the self-nucleating agent for the polyester resin, is endowed with the rapid crystallization ability and cannot result in the reduction of molecular weight. The preparation method is simple and feasible, and facilitates industrialized application.

Description

technical field [0001] The invention belongs to the technical field of resin materials, and in particular relates to a polyester self-nucleating agent and its preparation method and application. Background technique [0002] Polyethylene terephthalate (Poly (ethylene terephthalate), abbreviated as PET) has excellent mechanical properties and electrical insulation, and has the characteristics of low production cost and high cost performance, so it is widely used in fibers, films and Polyester bottles, etc. However, due to the rigid benzene ring and only two methylene groups in the PET molecular chain, the molecular chain has low flexibility, strong rigidity, and poor segment mobility, resulting in slow crystallization rate of PET, which is not conducive to injection molding. This limits the application of PET in the field of engineering plastics, such as automobiles and machinery industries. However, Poly(butylene terephthalate), abbreviated as PBT, which has a similar stru...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08J7/00C08G63/91
CPCC08G63/91C08J7/00C08J2367/02C08L67/02C08L2205/025C08L2205/24
Inventor 谢鸿洲吴林波
Owner ZHEJIANG UNIV
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