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Method for making polyester for low-haze biaxial stretching polyester film

A technology of biaxially oriented polyester and low haze, which is applied in the field of polyester preparation for low-haze biaxially oriented polyester film, can solve the problem that nanoscale inorganic substances are difficult to disperse uniformly, the price of anti-adhesives is high, and the film is difficult to disperse. Problems such as haze influence

Active Publication Date: 2008-12-31
SINOPEC YIZHENG CHEM FIBER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The patent No. US5475046A discloses the co-modification of polyester film with micro-silica and nano-alumina. The price of nano-alumina is relatively high and it is not easy to disperse.
[0011] Polyester film uses inorganic micron silica (SiO 2 ) as an anti-adhesive agent has a great influence on the haze of the film. The improvement of the above predecessors is mainly to add some nano-scale inorganic substances as an anti-adhesive agent. There are two main shortcomings in this respect: one is nano-scale Inorganic substances are difficult to disperse evenly, and the second is that the added anti-adhesive agent is more expensive

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 400ml of glass beads, 160g of barium sulfate, 640g of ethylene glycol, 0.24g of sodium polyphosphate into a 2L sand mill, grind for 0.5 hours, the average particle size of barium sulfate is 1.5μm, and obtain 20% mass concentration of barium sulfate-EG suspension liquid.

[0026] Add 5.0kg PTA, 2.8kgEG, 2.0g antimony acetate, 86.7g20% mass concentration barium sulfate-EG suspension in 20L general-purpose polymerization reactor, carry out esterification under 230~265 ℃, 0.2~0.3Mpa (table pressure) for 1 to 4 hours, and when the water output reaches 1200ml, release the pressure to normal pressure, add 1.025g of triphenyl phosphate, stir for 10 minutes at normal pressure, raise the temperature and lower the temperature to 280°C and below 100Pa, React for 1 to 3 hours. After the reaction is completed, it is extruded by a melt pump, pelletized, and dried to obtain polyester masterbatch chips.

[0027] Mix the prepared polyester masterbatch chips with super-bright polyes...

Embodiment 2

[0029] Add 400ml of glass beads, 80g of barium sulfate, 720g of ethylene glycol, and 0.12g of sodium polyphosphate into a 2L sand mill, grind for 0.3 hours, and the average particle size of barium sulfate is 3.2 μm to obtain a barium sulfate-EG suspension with a mass concentration of 10% liquid.

[0030] Add 5.0kg PTA, 2.8kgEG, 2.0g antimony acetate, 173.5g10% mass concentration barium sulfate-EG suspension in 20L general-purpose polymerization reactor, carry out esterification under 230~265 ℃, 0.2~0.3Mpa (table pressure) for 1 to 4 hours, and when the water output reaches 1200ml, release the pressure to normal pressure, add 0.44g trimethyl phosphate, stir at normal pressure for 10 minutes, raise the temperature and lower the temperature to 280°C and below 100Pa, React for 1 to 3 hours. After the reaction is completed, it is extruded by a melt pump, pelletized, and dried to obtain polyester masterbatch chips.

[0031] Mix the prepared polyester masterbatch chips with super-b...

Embodiment 3

[0033] Add 400ml of glass beads, 160g of barium sulfate, 640g of ethylene glycol, and 0.24g of potassium polyphosphate into a 2L sand mill, grind for 0.5 hour, and the average particle size of barium sulfate is 1.5 μm. A barium sulfate-EG suspension with a mass concentration of 20% was obtained.

[0034]Add 5.0kg PTA, 2.8kg EG, 1.46g ethylene glycol antimony, 28.9g 20% ​​barium sulfate-EG suspension into a 20L general-purpose polymerization reactor, and carry out esterification reaction at 230-265°C and 0.2-0.3Mpa Carry out the esterification reaction under (gauge pressure) for 1 to 4 hours. When the water output reaches 1200ml, release the pressure to normal pressure, add 1.025g of triphenyl phosphate, stir for 10 minutes at normal pressure, raise the temperature and lower the temperature to 280°C and 100Pa Thereafter, the reaction is carried out for 1 to 3 hours. After the reaction is completed, it is extruded by a melt pump, pelletized and dried to obtain polyester chips. ...

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PUM

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Abstract

The invention discloses a method for preparing polyester for a low-haze biaxially oriented polyester film. The method takes dibasic acid and dihydric alcohol as the main materials to prepare low-haze biaxially oriented polyester film through direct esterification method by means of esterification and polycondensation. Agglomeration resistant agent and catalyzer are added during the esterification process and stabilizer is added during the polycondensation process; agglomeration resistant agent is steatite, calcium carbonate, barium sulfate or kaolinite. When taking the polyester prepared through the method of the invention to make films, no other agglomeration resistant agents are needed, the haze is more than 30%lower than normal like products and the agglomeration resistance is comparable with normal like products.

Description

technical field [0001] The invention belongs to the field of polymer polymers, and in particular relates to a method for preparing polyester for biaxially stretched polyester films with low haze. Background technique [0002] Biaxially oriented polyethylene terephthalate film (BOPET for short) has excellent physical and chemical properties and can be widely used in many industrial fields. Although the properties of films for different purposes are different, the appearance requirements such as haze and transparency are basically the same. Especially in high-end product packaging, laser trademarks, anti-counterfeiting documents, decoration and other fields, the appearance of the film, especially the haze, is more demanding, and the special function of low haze and high transparency film is required to be clear and bright. Therefore, various production plants have invested a lot of manpower, material resources and financial resources to improve the transparency of the film, a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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IPC IPC(8): C08L67/02C08K3/34C08K3/26C08K3/30C08K3/32C08K5/521C08G63/78
Inventor 王树霞戴钧明
Owner SINOPEC YIZHENG CHEM FIBER
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