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PET composite material and preparation method thereof, and application of PET composite material

A composite material, ethylene technology, applied in the field of PET composite material and its preparation, can solve the problems of not being able to solve the problem of PET sticking to the mold, the mechanical properties of PET being greatly affected, and the reduction of the cold crystallization temperature being limited, etc., and achieving excellent mechanical mechanics. Performance, mold release effect improvement, crystal perfection effect

Inactive Publication Date: 2020-03-17
宁波华腾首研新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Inorganic nucleating agents mainly include: talcum powder, zinc powder, aluminum powder and graphite, etc. This kind of nucleating agent can increase the crystallization speed of PET to a certain extent, but the reduction of the cold crystallization temperature is limited, and it is difficult to reduce it to Below 120°C, so it can't solve the sticking problem of PET very well
Organic nucleating agents mainly include: monocarboxylic acid salts, benzoic acid and alkali metal salts of benzoic acid. This type of nucleating agent mainly breaks the PET molecular chain through the action of carboxylate to achieve the purpose of rapid crystallization; but the The method has a great influence on the mechanical properties of PET, and this kind of nucleating agent will cause more serious mold sticking

Method used

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  • PET composite material and preparation method thereof, and application of PET composite material
  • PET composite material and preparation method thereof, and application of PET composite material
  • PET composite material and preparation method thereof, and application of PET composite material

Examples

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preparation example Construction

[0026] The raw materials for the preparation of the PET composite material in the present invention include 1-3% of ethylene-(meth)acrylate nucleating agent, preferably 2-3%. In the present invention, the ethylene-(meth)acrylate nucleating agent preferably includes ethylene-(meth)acrylate zinc salt, ethylene-(meth)acrylate sodium salt and ethylene-(meth)acrylate lithium salt One or more of them, more preferably ethylene-(meth)acrylic acid sodium salt; in an embodiment of the present invention, the ethylene-(meth)acrylic acid sodium salt is purchased from DuPont, and the specific model is SURLYN8920. The present invention preferably adopts the above-mentioned nucleating agent, which can form ion clusters with PET resin in the melt processing process, and use the ion clusters as nucleation points to form spherulites with uniform size, which is conducive to making the cold crystallization temperature of PET composite materials Moving to the low temperature region, the melting poi...

Embodiment 1

[0052] Dry PET at 1400°C for 5 hours to keep the water content below 0.05%, mix the dried PET with toughening agent, nucleating agent and antioxidant evenly to obtain the first mixed material, and extrude it by twin-screw The main feeding port of the machine is added; the plasticizer and the mineral filler are placed in a high-speed mixer at a speed of 2000r / min, and mixed for 2 minutes. After mixing evenly, cool for 1 hour to obtain the second mixed material, which is produced by a twin-screw extruder Add the modified glass fiber from the second side feed port of the twin-screw extruder, and melt and knead in the twin-screw extruder; after the melting and kneading, the resulting mixed melt Extrude through a twin-screw extruder, then cool, air-dry, pelletize, and dry (dry in a blast oven at 120°C for 5 hours) to obtain a PET composite material;

[0053] Among them, the process parameters of melting and kneading are: the twin-screw extruder is divided into eleven temperature zo...

Embodiment 2～4

[0056] Referring to the method of Example 1 to prepare PET composite materials, the amount of each preparation raw material is specifically listed in Table 1.

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Abstract

The invention provides a PET composite material and a preparation method thereof, and application of a PET composite material, and belongs to the technical field of composite materials. The PET composite material provided by the invention comprises the following preparation raw materials in percentage by mass: 40-60% of PET, 1-3% of an ethylene-(meth)acrylate nucleating agent, 1-3% of a small molecule ester plasticizer, 3-5% of a flexibilizer, 0.5-2% of an antioxidant, 10-30% of a glass fiber and 5-20% of a mineral filler. According to the invention, the PET is used as a base material, the plasticizer is added on the basis of adding the nucleating agent, so that the cold crystallization temperature of PET can obviously move to a low-temperature area, the hot crystallization temperature andthe melting point of PET can obviously move to a high-temperature area, the crystallization speed of PET is increased, molecular chain arrangement is more regular, formed crystals are more perfect, the demolding effect is obviously improved, the formed crystals cannot be rearranged, and the size of a workpiece can be more stable.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a PET composite material and its preparation method and application. Background technique [0002] Polyethylene terephthalate (PET) is a resin with excellent performance and low cost. It is currently mainly used to prepare fibers, films and hollow containers. Because PET resin contains a large number of benzene rings in its molecules, the molecular rigidity is large, the mobility is poor, the glass transition temperature is high, and the crystallization speed is slow, resulting in long molding cycle, long molding cycle, easy to stick to the mold, and large molding shrinkage rate. The stability is poor, and the crystallized molding is brittle, which limits its application range. [0003] The glass transition temperature of PET resin is about 75°C, the crystallization temperature at elevated temperature (i.e. cold crystallization temperature) is approximately 145°C, th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L23/08C08K13/06C08K7/14C08K3/34C08K5/156
CPCC08K2201/003C08K2201/004C08K2201/005C08L67/02C08L2205/03C08L2205/24C08L23/0876C08K13/06C08K7/14C08K3/34C08K5/156
Inventor 边策唐帅刘峰吕孝腾曹金波
Owner 宁波华腾首研新材料有限公司
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