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Polyethylene terephthalate nucleating agent and preparation method thereof

A technology of polyethylene terephthalate and nucleating agent is applied in the field of nucleating agent and preparation of polyethylene terephthalate, and can solve the problem of difficult industrialization, complicated operation process, and difficulty in finding compatibilization. It can improve the melting and crystallization temperature, the preparation process is simple, and the crystallization rate can be accelerated.

Inactive Publication Date: 2013-06-12
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The copolymerization method mainly refers to the copolymerization of 1,4-butanediol, 1,3-propanediol, p-hydroxybenzoic acid and other monomers in the PET esterification process, but this method has complicated operation process and is not easy to industrialize
The blending method is mainly to blend PET with PBT, PC, PA, PLA, polyolefin, etc. to improve the crystallization properties of PET, but it is difficult to find a suitable compatibilizer for the blending method

Method used

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  • Polyethylene terephthalate nucleating agent and preparation method thereof
  • Polyethylene terephthalate nucleating agent and preparation method thereof
  • Polyethylene terephthalate nucleating agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Synthesis of polystyrene-b-poly(styrene-alt-maleic anhydride) diblock copolymer

[0026] Mix 106 g of styrene, 2.45 g of maleic anhydride, 0.0684 g of cumyl bisthiobenzoate (CDB), and 0.0208 g of azobisethylbutyronitrile (AIBN) into the reaction flask, and set the temperature at 60°C in a nitrogen atmosphere. React for 12 hours. The product was filtered through a large amount of methanol precipitation, and purified twice by THF dissolution-methanol precipitation. Dry in a vacuum oven at 60°C for 24 hours to obtain a polystyrene-b-poly(styrene-alt-maleic anhydride) diblock copolymer.

[0027] (2) Preparation of polystyrene-b-poly(styrene-alt-maleic anhydride) diblock ionomer

[0028] Dissolve the dried polystyrene-b-poly(styrene-alt-maleic anhydride) diblock copolymer in 1,4-dioxane solution, add sodium hydroxide to the solution in methanol saturated Solution, when its pH value is about 7 as measured by pH test paper, stop dropping methanol solution. The solution...

Embodiment 2

[0030] (1) Synthesis of polystyrene-b-poly(styrene-alt-maleic anhydride) diblock copolymer

[0031]Mix 52 g of styrene, 0.273 g of CDB and 0.04145 g of AIBN into the reaction flask, react at 60°C for 24 h in a nitrogen atmosphere, and synthesize a macromolecular PS-RAFT reagent with a relative molecular weight of 12670. The purification of the product is the same as in Example 1 . Dry in a vacuum oven at 60° C. for 24 hours to obtain a dry PS-RAFT reagent.

[0032] Mix 7.38 g of styrene, 6.9 g of maleic anhydride, 3 g of PS-RAFT reagent, 0.019 g of AIBN and 50 ml of cyclohexanone solvent into the reaction flask, react at 60°C for 35 minutes in a nitrogen atmosphere, and extend the chain The relative molecular weight of the synthesized poly(styrene-alt-maleic anhydride) block was 7341. Example 1 of crude product purification method, drying in a vacuum oven at 60°C for 24 hours to obtain polystyrene-b-poly(styrene-alt-maleic anhydride) diblock copolymer.

[0033] (2) Preparat...

Embodiment 3

[0036] (1) Synthesis of polystyrene-b-poly(styrene-alt-maleic anhydride) diblock copolymer

[0037] Mix 10.6 g of styrene, 9.8 g of maleic anhydride, 0.0546 g of CDB and 0.0164 g of AIBN and 50 ml of solvent into the reaction flask, and react at 60°C for about 2 hours under the protection of nitrogen to obtain the macromolecular SMA-RAFT The reagent has a relative molecular weight of about 16,000. After the product is purified, it is dried in a vacuum oven at 60°C for 24 hours to obtain a dry macromolecular SMA-RAFT reagent.

[0038] Mix 50 g of styrene, 3 g of SMA-RAFT reagent and 0.0154 g of AIBN into the reaction flask, and react at 60°C for 8 hours in a nitrogen atmosphere, polystyrene-b-poly(styrene-alt-malay anhydride) diblock copolymers. The product purification method was the same as that of Example 1, and it was dried in a vacuum oven at 60° C. for 24 hours to obtain a polystyrene-b-poly(styrene-alt-maleic anhydride) diblock copolymer.

[0039] (2) Polystyrene-b-pol...

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Abstract

The invention belongs to the technical field of high polymer materials, and in particular relates to a polyethylene terephthalate nucleating agent and a preparation method thereof. The method comprises the following steps of: based on polystyrene-b-poly(styrene-alt-maleic anhydride) diblock copolymer as a raw material, hydrolyzing, salinizing and purifying to prepare an ionomer of the polystyrene-b-poly(styrene-alt-maleic anhydride) diblock copolymer. A polystyrene block can form microphase separation in molten polyethylene terephthalate (PET), and thus, a crystal nucleus is provided for PET crystallization; and moreover, a poly(styrene-alt-maleic anhydride) block and PET are well compatible with each other, so that crystallization surface energy can be reduced, and the crystallization temperature and crystallization speed of the PET can be increased. In addition, a plasticizer such as di-2-ethylhexy1 azelate is added while the nucleating agent is added, the movement velocity of a PET chain segment can be further increased, so that the growing speed of crystals is increased. The preparation method is simple, convenient to operate, high in benefit, low in cost and suitable for industrial production.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a nucleating agent suitable for polyethylene terephthalate and a preparation method. Background technique [0002] As a general-purpose thermoplastic, polyethylene terephthalate (PET) can be divided into non-engineering plastic grades and engineering plastic grades. Non-engineering plastic grades are mainly used in fibers, beverage bottles, sheets, baking-resistant food containers, etc., and engineering plastic grades are mainly used in automobiles, electronic appliances, and machinery industries. The long-term use temperature of PET can reach 120°C, and it has excellent physical and mechanical properties in a relatively high temperature range, such as high impact strength, friction resistance, high rigidity, high hardness, stable size, good electrical insulation performance, and insoluble in most Most organic solvents and inorganic acids, so PET is widely ...

Claims

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Application Information

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IPC IPC(8): C08F212/08C08F222/06C08F293/00C08L67/02C08L53/00C08K5/12
Inventor 唐萍邢士理
Owner FUDAN UNIV
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