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Method for preparing thermoplastic resin film

A thermoplastic resin and film technology, used in flat products, applications, household appliances, etc., can solve the problems of difficult to control the vertical and horizontal orientation, difficult to control the resin temperature, complicated factors affecting the equipment process, etc., to achieve the internal molecular arrangement and distribution. Uniform and reasonable, optical performance and gas permeability improvement, the effect of expanding the temperature range

Active Publication Date: 2010-07-07
FOSHAN KING WONDER HI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, unstretched or slightly stretched thermoplastic resin films prepared by melt casting and blow molding have the following defects: the orientation of the longitudinal and transverse directions is difficult to control; internal stress, crystal shape, molecular distribution and The aggregation state is difficult to control; the mechanical and mechanical properties, dimensional stability, optical properties and gas permeability of the resulting film are also difficult to control, etc.
However, the disadvantages of this method are that it is difficult to control the temperature of the resin, the cold roll of the casting sheet is easy to cause the orientation of the film, and the factors affecting the equipment and process such as the pressure control of the extruded body are relatively complicated, which will cause the molecular orientation, crystal form and distribution of the film to change. Inhomogeneity, resulting in poor controllability of mechanical properties, optical properties and apparent morphology
But the defect of this method is: it needs to dry the water after rapid cooling in the water tank, the production process is long and the production process is complicated, and the introduction of water in the molten state of the film will affect the performance of thermoplastic resin materials such as polyester resin materials, and even make them degradation
However, the molecular arrangement obtained by this method has not been finalized in the later stage, causing the molecular arrangement to be affected by orientation and stress, which makes the improvement of optical properties limited.

Method used

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  • Method for preparing thermoplastic resin film
  • Method for preparing thermoplastic resin film

Examples

Experimental program
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Effect test

Embodiment 1~4

[0025] according to figure 1 Process flow sheet shown, the corresponding blended thermoplastic resin (LDPE, PP, PA6, PET) in Table 1 and other auxiliary agent antioxidant 1010 are uniformly mixed by 100% and 1% by weight, flow from the die mouth Extruded, cooled by a quenching roll at a temperature of 10-60°C to make a film with a thickness of 10-100 μm, and then according to the heat treatment process conditions of Examples 1-4 corresponding to Table 2, heat treatment with a touch roll to obtain a thickness A film of 10-100 μm is used to obtain the thermoplastic resin film material of the present invention.

Embodiment 5~9

[0027] According to attached figure 2As shown in the process flow diagram, the corresponding blended thermoplastic resins (PS, TPU, TPE, TPEA, TPO) in Table 1 and other additives and antioxidants 1010 are uniformly mixed at a weight percentage of 1%, and blown into a film The film tube is melted and extruded by the extruder, and the film tube is formed through the die; the film tube is blown into the compressed air through the wind ring to inflate the film tube, and then cooled and shaped by the shaping frame, and then the film is flattened with a herringbone plate tube, made into a film, and then according to the heat treatment process conditions of Examples 5 to 9 corresponding to Table 2, heat treatment with a touch roll to prepare a film with a thickness of 10 to 100 μm, that is, the thermoplastic resin film material of the present invention.

[0028] Table 1 (ratio is weight percent)

[0029]

[0030] Table 2

[0031]

Embodiment 10

[0033] Attached figure 1 In the process flow shown, the thermoplastic resin PET, modified resin PA66 and its compatibilizer are uniformly mixed in a weight ratio of 60:34:6, and then cast and extruded from the die head, passing through a temperature of 15-50 ° C. The quenching roll is cooled to form a thin film, and the 2 Under the conveying, enter the heat treatment process stage of the touch roller, the temperature is 240 ~ 190 ℃, after 0.5 ~ 1.5s, natural cooling and winding, the film with a thickness of 10 ~ 100 μm is obtained, that is, the thermoplastic resin film material of the present invention is obtained. .

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Abstract

The invention discloses a method for preparing a thermoplastic resin film, wherein, the film is not stretched or extended to a micro-stretch film with drawing ratio 0.1-60 per cent through melting cast film or blow molding, and then transferred to a heat treatment device for heat treatment more than 0.1s and less than 1200s under the condition of convey tension range of 0.1-300 N / cm<2> and in therange of heat treatment temperature below thermoplastic resin melting point Tm and above glass transition temperature (Tg+50 DEG C). The method of the invention combines the advantages of melting cast or blow molding and heat treatment. The resulting thermoplastic resin film has reasonable internal molecular structure and orientation, perfect and controllable mechanical property, dimension stability, temperature range, optical property and air permeability.

Description

technical field [0001] The present invention relates to a method for preparing a thermoplastic resin film. Background technique [0002] In the prior art, unstretched or slightly stretched thermoplastic resin films prepared by melt casting and blow molding have the following defects: the orientation of the longitudinal and transverse directions is difficult to control; internal stress, crystal shape, molecular distribution and The aggregation state is difficult to control; the mechanical and mechanical properties, dimensional stability, optical properties and gas permeability of the obtained film are also difficult to control. The main reason for these defects may be related to the fact that the curing process can only eliminate part of the internal stress. [0003] The common melt casting method is to melt and cast a thermoplastic resin into a cast film or blow it into an unstretched or slightly stretched film and then wind it up. For non-crystalline thermoplastic resins,...

Claims

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Application Information

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IPC IPC(8): B29C71/02B29L7/00B29K21/00B29K75/00B29K27/12B29K67/00B29K77/00B29K25/00B29K23/00
Inventor 林裕卫蔡朝辉吴耀根
Owner FOSHAN KING WONDER HI TECH CO LTD
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