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A high stiffness optical polyester film

A polyester film, high stiffness technology, applied in chemical instruments and methods, other household appliances, synthetic resin layered products, etc., can solve the problems of complicated polyester film processes, high production costs, poor product appearance, etc. Achieve the effect of improving dimensional stability, improving stiffness, and not easy to agglomerate

Active Publication Date: 2021-10-08
HEFEI LUCKY SCI & TECH IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a polyester film with high stiffness, which can effectively meet the requirements for high stiffness of the polyester film, solve the problem of complicated polyester film processes, high production costs, and product appearance. Obscure, low yield and other issues

Method used

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  • A high stiffness optical polyester film

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preparation example Construction

[0036] The preparation method of modified polyester is:

[0037] 1. Add the required dibasic acid, dibasic alcohol, catalyst, stabilizer in sequence in the polyester reactor, and modify the dispersed aluminate coupling agent according to the mass ratio of 1:1 to 5:1. The diameter is 0.05μm~0.3μm, 0.7μm~1.5μm in length MgO whiskers and 0.15μm~0.6μm in diameter, 1μm~2.5μm in length silicon carbide whisker-ethylene glycol dispersion, beat for 15 minutes, and pass Under nitrogen protection, carry out esterification at 235°C-265°C and 255KPa for 3h-4.5h. Wherein, the dibasic acid is selected from one or any combination of terephthalic acid, isophthalic acid or terephthalic acid, preferably terephthalic acid, isophthalic acid, most preferably terephthalic acid. The dihydric alcohol is selected from one or any combination of ethylene glycol, propylene glycol, or 1,4-cyclohexanedimethanol, preferably ethylene glycol, 1,4-cyclohexanedimethanol, and most preferably ethylene glycol. Th...

Embodiment 1

[0048] Preparation of modified polyester:

[0049] According to the molar ratio of terephthalic acid and ethylene glycol 1:1.3, the addition amount of ethylene glycol antimony is 180ppm, the addition amount of trimethyl phosphate is 35ppm, and the mass ratio of 1:1 has been dispersed by SG-A1821 and DL-411DF The magnesium oxide whiskers with a diameter of 0.05 μm and a length of 0.7 μm and silicon carbide whiskers with a diameter of 0.15 μm and a length of 1 μm-ethylene glycol dispersion were respectively modified by the two combinations. After the above is mixed evenly, add it to the polyester synthesis reaction kettle, beat for 15 minutes, and pass through nitrogen protection, and carry out esterification for 3 hours at 235 ° C ~ 265 ° C and 255 KPa; Under the condition of 265℃~280℃, 30Pa, polycondensation reaction for 2 hours, after spinning, cooling, pelletizing and drying, the modified magnesium oxide whisker and silicon carbide whisker with an overall concentration of 50...

Embodiment 2

[0052] Preparation of modified polyester:

[0053] According to the molar ratio of terephthalic acid and ethylene glycol 1:1.3, the addition amount of ethylene glycol antimony is 180ppm, the addition amount of trimethyl phosphate is 35ppm, and the mass ratio of 2:1 is satisfied. SG-A1821 and DL-411DF The magnesium oxide whiskers with a diameter of 0.05 μm and a length of 0.9 μm and silicon carbide whiskers with a diameter of 0.2 μm and a length of 1 μm-ethylene glycol dispersion were respectively modified by the two combinations. After the above is mixed evenly, add it to the polyester synthesis reaction kettle, beat for 15 minutes, and pass through nitrogen protection, and carry out esterification for 3 hours at 235 ° C ~ 265 ° C and 255 KPa; Under the condition of 265℃~280℃ and 20Pa, the polycondensation reaction was carried out for 2.5h, and after spinning, cooling, pelletizing and drying, the MgO whisker and silicon carbide whisker had an overall concentration of 100ppm an...

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Abstract

The invention provides a polyester film with high stiffness. The polyester film is a biaxially stretched polyester film co-extruded with a three-layer A / B / A structure. The B layer contains magnesium oxide whiskers and silicon carbide crystals. Whisker-modified polyester, the magnesium oxide whiskers have a diameter of 0.05 μm to 0.3 μm and a length of 0.7 μm to 1.5 μm, and the silicon carbide whiskers have a diameter of 0.15 μm to 0.6 μm and a length of 1 μm to 2.5 μm, The surfaces of the magnesium oxide whiskers and the silicon carbide whiskers are respectively modified by an aluminate coupling agent. The polyester film of the present invention has the characteristics of high stiffness, optical properties, mechanical properties, and good appearance quality, greatly improves the deformation resistance of the polyester film, effectively simplifies the production process of the product, greatly reduces the production cost, and improves Product processing yield. It can be widely used in release, protection, explosion-proof, liquid crystal display, new energy photovoltaic and other fields.

Description

technical field [0001] The invention relates to the technical field of films, in particular to a layered optical film made of polyester. Background technique [0002] Polyester (polyethylene terephthalate PET), as one of the important synthetic materials, occupies an important position in industrial production. PET film exists independently as a special form of polyester and is produced by melt co-extrusion and biaxial stretching. Because of its good mechanical properties, thermal properties, electrical insulation and optical properties, it is widely used in packaging, industry, electrical, electronic, display, protection, explosion-proof and other fields. [0003] Electronic, electrical, new energy and other equipment are constantly being updated, and the size of the equipment is getting larger and larger. At the same time, higher requirements are put forward for the stiffness of the polyester film itself. Due to the insufficient stiffness of pure polyester film, it is di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/06B32B27/36B32B27/20B29D7/01C08J5/18C08L67/02C08K9/04C08K7/08C08K7/10
CPCB29D7/01B32B27/08B32B27/20B32B27/36B32B2250/03B32B2250/40B32B2307/40C08J5/18C08J2367/02C08K7/08C08K7/10C08K9/04C08K2201/003C08K2201/004
Inventor 王钦周通高青程龙宝杜坤
Owner HEFEI LUCKY SCI & TECH IND