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Low temperature resistant poly(ethylene terephthalate) (PET) plastic pack belt and preparation method thereof

A low-temperature-resistant, packing tape technology, applied in packaging, packaging recycling, transportation and packaging, etc., can solve the problems of low-temperature lap strength reduction, no low-temperature-resistant polyester plastic packing tape processing method, and frequent collapse of cotton packaging.

Active Publication Date: 2012-10-17
上海自立塑料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After research, it was found that the main reason for the low lap strength of PET packing belts at low temperatures is that the glass transition temperature Tg of PET plastics is as high as 79 degrees Celsius above zero. At low temperatures far from its Tg, the movement of chain segments is greatly restricted. , resulting in a rapid increase in the brittleness of PET plastics at low temperatures
This low-temperature embrittlement phenomenon is particularly evident at the lap joints of the packing belts, resulting in a significant decrease in the strength of the low-temperature lap joints due to the increase in the internal stress difference, which eventually leads to frequent collapse of the cotton packaging
[0015] In the prior art, all do not relate to the low-temperature-resistant polyester plastic strap and processing method thereof for industrial product packaging as shown in the present invention

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The first step: 94% new PET resin material is stirred by a mixer for 15 minutes, and then sent to a desiccator for 3 hours at 130°C to dehumidify;

[0046] Step 2: Send the dry PET resin into the feeding bin with stirring function. At the same time, use a small screw feeder to add 4.5% polyethylene octene copolymer elastomer, 1.0% sarin nucleating agent and 0.5% high molecular weight hindered amine light stabilizer, and stirred in the silo;

[0047] The third step: under stirring, add the above-mentioned mixture into a single-screw extruder with a screw compression ratio of 3.5:1, a length-to-diameter ratio of 30:1, and a mixing and plasticizing temperature of 260°C;

[0048] The fourth step: the parison extruded from the extruder is quenched through a cooling tank with a water temperature of 10°C; then it is preheated through a preheating oven with a length of 8 meters and a temperature of 180°C; In the stretching section, 4.2 times of orientation stretching is achiev...

Embodiment 2

[0050] The first step: 96% PET resin is stirred by a mixer for 15 minutes, and then sent to a desiccator at 150°C for dehumidification and drying;

[0051] Step 2: Send the dry PET resin into the feeding bin with stirring function. At the same time, use a small screw feeder to add 3.5% polyethylene octene copolymer elastomer, 0.5% sarin nucleating agent and 1.0% high molecular weight hindered amine light stabilizer, and stirred in the silo;

[0052] The third step: under stirring, add the above-mentioned mixture into a single-screw extruder with a screw compression ratio of 3.5:1, a length-to-diameter ratio of 30:1, and a mixing and plasticizing temperature of 260°C;

[0053] The fourth step: the parison extruded from the extruder is quenched through a cooling tank with a water temperature of 10°C; then it is preheated through a preheating oven with a length of 8 meters and a temperature of 180°C; In the stretching section, 4.4 times of orientation stretching is achieved throug...

Embodiment 3

[0055] The first step: 97% PET resin is stirred by a mixer for 15 minutes, and then sent to a desiccator at 150°C to dehumidify and dry;

[0056] Step 2: Send the dry PET resin into the feeding bin with stirring function. At the same time, use a small screw feeder to add 2.0% polyethylene octene copolymer elastomer, 0.5% sarin nucleating agent and 0.5% high molecular weight hindered amine light stabilizer, and stirred in the silo;

[0057] The third step: under stirring, add the above-mentioned mixture into a single-screw extruder with a screw compression ratio of 3.5:1, a length-to-diameter ratio of 30:1, and a mixing and plasticizing temperature of 260°C;

[0058] The fourth step: the parison extruded from the extruder is quenched through a cooling tank with a water temperature of 10°C; then it is preheated through a preheating oven with a length of 8 meters and a temperature of 180°C; In the stretching section, 4.6 times of orientation stretching is achieved through the li...

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Abstract

The invention belongs to the technical field of pack belts, and discloses a low temperature resistant poly(ethylene terephthalate) (PET) plastic pack belt and a preparation method thereof. The low temperature resistant PET plastic pack belt comprises the following components in percentage by weight: 92-98% of PET resin, 1.0-5.0% of low temperature resistant auxiliary, 0.5-2.0% of nucleating agentand 0.5-1.0% of light stabilizer. The preparation method of the pack belt comprises the following steps: evenly stirring the 92-98% of PET resin in an agitator, putting the stirred PET resin in a drier, and drying; adding the 1.0-5.0% of low temperature resistant auxiliary, the 0.5-2.0% of nucleating agent and the 0.5-1.0% of light stabilizer to the dried PET resin in the agitator, and evenly stirring; and mixing and plasticing by virtue of an extruder, extruding out a parison, instantly cooling the parison, preheating, heating, stretching, heat setting, cooling setting and rolling so as to obtain the finished pack belt. The various performance indexes, especially the lap joint breakage load of the pack belt in the invention at low temperature are constant,; and simultaneously, crisping, cracking and pack bursting phenomena are not generated in the processes of pack operation, storage and transportation at low temperature.

Description

technical field [0001] The invention belongs to the technical field of packing belts, and in particular relates to a low-temperature resistant PET plastic packing belt and a preparation method thereof. Background technique [0002] PET (polyethylene terephthalate) is one of the most widely used engineering plastics. Its density is 1.3~1.4g / cm 3 , the intrinsic viscosity (IV) is 0.62-1.20ml / g, and the melting point is 245-265°C. PET plastic is transparent, high gloss, has good weather resistance and chemical stability, impact resistance, creep resistance and dimensional stability; generally speaking, it can also be used in a wide temperature range and maintain Excellent physical and mechanical properties, is a high-value plastic. [0003] PET can be processed into products by various plastic molding processes. Extruded PET sheets, tapes, and tubes can be stretched biaxially or uniaxially at a temperature of (80°C to 100°C) to significantly improve their mechanical propert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08L23/08B65D63/10B29C47/92B29C48/92
CPCY02W30/80
Inventor 陈存兴许乾慰
Owner 上海自立塑料科技有限公司