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Low-melting-point polyester preparation method

A low-melting polyester and melt blending technology, applied in the field of low-melting polyester, can solve problems such as melting point instability of low-melting polyester

Pending Publication Date: 2018-06-15
NANJING POLYTECHNIC INSITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a method for preparing low-melting-point polyester, aiming to solve the instability of melting point of low-melting-point polyester prepared by blending modification method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A kind of preparation method of low melting point polyester is as follows:

[0020] 1. Dry PET and PBT separately in a special oven, the drying temperature is 109~119°C, and the drying time is 50 hours.

[0021] 2. Proportion the slices dried in step 1 above according to PET:PBT=1:0.3.

[0022] 3. Melt blend PET, PBT and 0.3% calcium acetate in the above step 2 in the screw extruder and granulate. ℃, and the latter part is 250~260℃.

[0023] 4. Dry the granules obtained in the above step 3 in an oven, the drying temperature is 109~119°C, and the drying time is 50 hours.

[0024] 5. Put the dried pellets and 7.5% modified PEG in the above step 4 into a high-speed mixer for preliminary mixing. The mixing condition is 500 rpm for 2 minutes. The modified PEG is modified with acetic acid and has a molecular weight of 1000.

[0025] 6. Melt and blend the compound obtained in the above step 5 again in the screw extruder and granulate. The melt blending temperature is 240~2...

Embodiment 2

[0028] A kind of preparation method of low melting point polyester is as follows:

[0029] 1. Dry PET and PBT separately in a special oven, the drying temperature is 109~119°C, and the drying time is 50 hours.

[0030] 2. Proportion the slices dried in step 1 above according to PET:PBT=1:1.

[0031] 3. Melt blend PET, PBT and 0.3% calcium acetate in the above step 2 in the screw extruder and granulate. ℃, and the latter part is 260~265℃.

[0032] 4. Dry the granules obtained in the above step 3 in an oven, the drying temperature is 109~119°C, and the drying time is 50 hours.

[0033] 5. Put the dried pellets and 9% modified PEG in the above step 4 into a high-speed mixer for preliminary mixing. The mixing condition is 1000 rpm for 1 minute. The modified PEG is modified with stearic acid and has a molecular weight of 2000.

[0034] 6. Melt and blend the compound obtained in the above step 5 again in the screw extruder and granulate. The melt blending temperature is 240~250°...

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Abstract

A purpose of the present invention is to provide a low-melting-point polyester preparation method, which comprises: drying PET, PBT or PTT, carrying out reactive blending and granulation on the driedPET, PBT or PTT and a transesterification agent at a temperature of 240-290 DEG C through a screw extruder, carrying out primary mixing on the obtained slices and modified PEG through a high-speed mixer, and blending through the screw extruder to obtain the low-melting-point polyester.

Description

technical field [0001] The invention relates to a method for preparing low-melting-point polyester, in particular to a method for preparing low-melting-point polyester by blending and blending transesterification. Background technique [0002] Low-melting point polyester refers to the general term for modified polyesters with a lower melting point than conventional polyesters (polyethylene terephthalate, PET, referred to as polyester), and the melting point is generally below 240°C. Materials such as filters and non-woven fabrics can be prepared, especially non-woven materials for automobile sound insulation mats can be prepared. At present, the preparation method of low-melting point PET is mainly to lower the melting point by adding copolymerization modification monomers. Although copolymerization modification can adjust the melting point of polyester in a wider range, due to the complexity of the copolymerization process, the investment is large and the risk is high. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/02C08L71/02B29C47/92B29B9/06B29C48/92
CPCC08L67/02B29B9/06B29C48/92B29C2948/92704C08L2205/03C08L2205/025C08L71/02
Inventor 伍凯飞杨福兴邹多福
Owner NANJING POLYTECHNIC INSITUTE