Modified PET plastic and preparation method thereof

A plastics and modification technology, applied in the field of modified PET plastics and its preparation, can solve the problems of adverse effects on the quality of PET products, poor impact strength and fluidity, etc.

Pending Publication Date: 2022-03-18
王晖
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing PET materials have poor impact strength and flui

Method used

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  • Modified PET plastic and preparation method thereof
  • Modified PET plastic and preparation method thereof
  • Modified PET plastic and preparation method thereof

Examples

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preparation example Construction

[0025] In a specific embodiment of the present invention, the preparation method of the NCO-terminated polyurethane prepolymer includes: under the protection of a nitrogen atmosphere, mixing polyols and polyisocyanates, and performing a polymerization reaction to obtain an NCO-terminated polyurethane prepolymer. In the present invention, the polyol is preferably polyester polyol, specifically neopentyl glycol (NPG). In the present invention, the molar ratio of the hydroxyl group of the polyol to the NCO of the polyisocyanate is preferably 1:1.5˜4.5. In the present invention, the temperature of the polymerization reaction is preferably 80-100°C.

[0026] In the present invention, based on the parts by weight of the PET resin, the raw materials for preparing the modified PET plastic include 0.5-2 parts of additives, preferably 0.6-1.1 parts. In the present invention, the additives preferably include compatibilizers, release agents and / or stabilizers. In the present invention, ...

Embodiment 1

[0034] The preparation method of terminal NCO polyurethane prepolymer:

[0035] Remove a small amount of water from NPG, under the protection of nitrogen atmosphere, add NPG to excess MDI, stir and disperse the product, and take away a lot of heat at the same time, stop adding when the NCO content of the isocyanate is 1.5 to 4.5 times the OH content of the added polyol Polyol, the reaction temperature is 80-100 DEG C, and the terminal NCO polyurethane prepolymer is obtained.

[0036] In parts by weight, 94.9 parts of PET resin, 1 part of nano-silica, 3 parts of terminal NCO polyurethane prepolymer, 0.5 part of calcium stearate, 0.3 part of PETS and 0.3 part of antioxidant BASF 1076 are mixed, all Add a high-speed mixer and stir for 5 minutes at a speed of 150r / min to obtain a premix; put the premix into a twin-screw extruder through the main feeding port for co-extrusion, and the barrel temperature of the twin-screw extruder is 130 ~ 180°C, the screw speed is 300-400r / min, th...

Embodiment 2

[0038] In parts by weight, 94.9 parts of PET resin, 1 part of nano-silica, 0.5 part of nano-sodium bicarbonate, 3 parts of terminal NCO polyurethane prepolymer prepared in Example 1, 0.3 part of PETS and 0.3 part of antioxidant BASF 1076 for mixing, all added to a high-speed mixer, and stirred at 150r / min for 5 minutes to obtain a premix; the premix was added to a twin-screw extruder through the main feeding port for co-extrusion, and the twin-screw extruder material The barrel temperature is 130-180°C, the screw speed is 300-400r / min, the vacuum degree is 0.5-0.8MPa, and the screw length-to-diameter ratio is 40 to obtain the modified PET plastic.

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Abstract

The invention provides a modified PET plastic and a preparation method thereof, and relates to the technical field of plastic materials. The modified PET plastic provided by the invention comprises the following preparation raw materials in parts by weight: 90-98 parts of PET resin; 0.5 to 5 parts of filler; 0.5 to 3 parts of a toughening agent; and 0.5-2 parts of an additive. According to the invention, the filler can promote crystallization of the material and improve fluidity, and also has the effects of toughening and shrinkage prevention; the toughening agent can obviously improve the impact toughness of the PET resin; the additive can improve the comprehensive use performance of the modified PET plastic. The fluidity, the heat resistance and the impact strength of the PET plastic can be improved through the compounding effect of all the preparation raw materials. The result of the embodiment shows that the HDT B of the modified PET plastic provided by the invention is greater than or equal to 75 DEG C, and the heat resistance is relatively high; the impact strength is greater than or equal to 45kJ/m < 2 >, and the impact strength is high.

Description

technical field [0001] The invention relates to the technical field of plastic materials, in particular to a modified PET plastic and a preparation method thereof. Background technique [0002] Polyethylene terephthalate (PET) is a milky white or light yellow, highly crystalline polymer with a smooth and shiny surface; it has excellent physical and mechanical properties in a wide temperature range, and the long-term use temperature can reach 120 ° C , excellent electrical insulation, even at high temperature and high frequency, its electrical performance is still good. [0003] PET can generally be used for extrusion to prepare textiles, toothbrush filaments, pipes and profiles, etc.; it can also be used for blow molding to prepare beverage bottles and cosmetic bottles. However, the existing PET materials have poor impact strength and fluidity, which will adversely affect the quality of PET products. Contents of the invention [0004] The object of the present invention ...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08L75/04C08L67/00C08K3/36C08K3/26C08K5/098
CPCC08L67/02C08L2201/08C08K2201/011C08L75/04C08K3/36C08K5/098C08K3/26C08L67/00
Inventor 王晖
Owner 王晖
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