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Glass fiber enhanced PET/PBT (Polyethylene Terephthalate)/(Polybutylene Terephthalate) alloy with high glossiness and low warping degree and preparation method thereof

A low-warpage, high-gloss technology, applied in the field of thermoplastic polymer materials, can solve the problems of high molding mold temperature, long molding cycle, low production energy consumption, etc., and achieve the effects of fast crystallization rate, low cost and low shrinkage rate

Active Publication Date: 2011-05-04
SHENZHEN FUHENG PLASTICS PIGMENT
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] PET (polyethylene terephthalate, polyethylene terephthalate) is a linear thermoplastic polymer that was first industrialized by Dupont in 1953. It is a high melting temperature (Tm) and glass transition temperature (Tg). It is a crystalline polymer that can maintain excellent physical and mechanical properties in a wide temperature range. It has excellent fatigue resistance, friction resistance, excellent aging resistance, and outstanding electrical insulation. It is resistant to most organic solvents. It is stable with inorganic acids, and the production energy consumption is very low, and the processability is good, so it is widely used in the fields of synthetic fibers, films and engineering plastics. However, due to the rigidity of PET, the crystallization speed is slow, the molding mold temperature is high and the molding cycle The shortcoming of length limits its application in the field of engineering plastics

Method used

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  • Glass fiber enhanced PET/PBT (Polyethylene Terephthalate)/(Polybutylene Terephthalate) alloy with high glossiness and low warping degree and preparation method thereof

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preparation example Construction

[0037] The preparation method of PET / PBT alloy of the present invention comprises:

[0038] Step 1. Weigh each component according to the above-mentioned mass percentage, and dry the weighed PET and PBT at a temperature of 110-130°C for more than 4 hours, and dry the other components at a temperature of 60-80°C More than 2 hours; this is because PET and PBT are easy to absorb moisture, so they must be dried before blending and modification;

[0039] Step 2. Put the dried PET, PBT, compatibilizer, antioxidant, nucleation accelerator, composite nucleation agent and processing aid into a high-speed mixer and mix them at room temperature for 5-15 minutes;

[0040] Step 3: Add the mixed material in Step 2 into the hopper of the twin-screw extruder, add the glass fiber from the glass fiber inlet in the middle of the twin-screw, melt and blend, extrude, water-cool, air-dry, and pelletize; The screw extruder can use a parallel twin-screw extruder with a screw diameter of 35-75mm;

...

Embodiment 1

[0044] Dry PET and PBT at 110°C for 4 hours, and dry the rest of the additives at 70°C for 2 hours. Weigh PET 40.5kg, PBT 35kg, compatibilizer 4kg, composite nucleating agent 3kg (including P2500.5kg, talcum powder 3kg), nucleation accelerator 1kg, antioxidant 10100.3kg, 1680.3kg, lubricant CBT 0.9kg ; Then mix in a high speed mixer for 10min. The uniformly mixed material is added to the hopper of the twin-screw extruder, and the temperature of each section is controlled at: Zone 1: 210°C; Zone 2: 220°C; Zone 3: 230°C; Zone 4: 240°C; Zone 5: 250°C ; Zone six: 240°C; Zone seven: 240°C; Zone eight: 230°C; Head temperature: 250°C, screw speed 350r / min, glass fiber 15kg is added from the glass fiber inlet in the middle of the twin-screw, and melted together Mixed extrusion, water cooling, air drying, pelletizing, and finally bagged into glass fiber reinforced PET / PBT alloy finished products.

Embodiment 2

[0046]Dry PET and PBT at 120°C for 4 hours, and dry the rest of the additives at 60°C for 2 hours. Weigh PET 30kg, PBT 30.3kg, compatibilizer 10kg, composite nucleating agent 8kg (wherein P2505kg, talcum powder 3kg), nucleating accelerator 1kg, antioxidant 10100.1kg, 1680.2kg, lubricant CBT 0.4kg; Mix in a high speed mixer for 10 min. The uniformly mixed material is added to the hopper of the twin-screw extruder, and the temperature of each section is controlled at: Zone 1: 210°C; Zone 2: 220°C; Zone 3: 230°C; Zone 4: 240°C; Zone 5: 250°C ; Zone 6: 250°C; Zone 7: 240°C; Zone 8: 230°C; Head temperature: 250°C, screw speed 320r / min, glass fiber 20kg is added from the glass fiber inlet in the middle of the twin-screw, and melted together Mixed extrusion, water cooling, air drying, pelletizing, and finally bagged into glass fiber reinforced PET / PBT alloy finished products.

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Abstract

The invention discloses a glass fiber enhanced PET / PBT (Polyethylene Terephthalate) / (Polybutylene Terephthalate) alloy with high glossiness and low warping degree and a preparation method thereof. The PET / PBT alloy comprises the following components by mass percentage content: 15-60% of PBT, 19-60% of PET, 3-10% of compatilizer, 0.3-0.9% of antioxygen, 0.5-1% of nucleating accelerating agent, 3-8% of composite nucleating agent, 10-30% of glass fiber and 0.4-1% of processing aid. According to the invention, the PET and the PBT are fused to obtain the PET / PBT alloy, and the PET / PBT alloy has the advantages of quick crystallizing speed rate, good physical performance, high distortion temperature, high surface glossiness, low contractibility rate, stable dimension, low warping degree and lower cost; and the PET / PBT alloy of the invention can be used for completely replacing the bakelite powder under a specific occasion.

Description

technical field [0001] The invention relates to the technical field of thermoplastic polymer materials, in particular to a glass fiber-reinforced PET / PBT alloy with high gloss and low warpage and a preparation method thereof. Background technique [0002] PET (polyethylene terephthalate, polyethylene terephthalate) is a linear thermoplastic polymer that was first industrialized by Dupont in 1953. It is a high melting temperature (Tm) and glass transition temperature (Tg). It is a crystalline polymer that can maintain excellent physical and mechanical properties in a wide temperature range. It has excellent fatigue resistance, friction resistance, excellent aging resistance, and outstanding electrical insulation. It is resistant to most organic solvents. It is stable with inorganic acids, and the production energy consumption is very low, and the processability is good, so it is widely used in the fields of synthetic fibers, films and engineering plastics. However, due to the...

Claims

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Application Information

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IPC IPC(8): C08L67/02C08K13/04C08K7/14C08K3/34B29B9/06B29C47/92B29C48/92
CPCB29C48/911B29C48/0022B29C48/04
Inventor 申应军郑辉万东波
Owner SHENZHEN FUHENG PLASTICS PIGMENT
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