Modified PET copolyester and preparation method and application thereof
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A copolyester and modification technology, applied in the field of polyester preparation, can solve the problems of high price of diacylbiscaprolactam, unfavorable industrial production, difficulty in diffusion of small molecules, etc., so as to reduce thermal degradation reaction, shorten production cycle, and reduce polycondensation. effect of time
Active Publication Date: 2014-03-26
KINGFA SCI & TECH CO LTD
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Problems solved by technology
In the later stage of the polymerization reaction, the viscosity of the material becomes larger, and it is difficult for small molecules to diffuse in the melt. To obtain high-molecular-weight copolyesters, it is necessary to stay in the polycondensation tank for a long time, which will lead to degradation reactions and lead to resin degradation. The color turns yellow and the terminal carboxyl group increases, which reduces the performance of the product
Chinese patent CN200710177236.2 discloses a method for preparing high-viscosity polybutylene adipate by using binary oxazoline and diacyl biscaprolactam in combination with chain extension method, which can prepare polybutylene adipate with a viscosity of 1.1dL / g Resin, but in this method, diacyl biscaprolactam will produce small molecular compounds during chain extension, which will deteriorate the performance of the resin, and the price of diacyl biscaprolactam is relatively high, which is not conducive to industrial production
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preparation example Construction
[0061] Preparation of oxazoline compound masterbatch: (taking 2,2-bis-2-oxazoline as an example)
[0062] After mixing 3Kg of 2,2-bis-2-oxazoline and 7Kg of polyethylene terephthalate-co-polyethylene adipate in a high-speed mixer, put it into a twin-screw extruder , the temperature of the extruder is 140-160°C. After extrusion, strand drawing, water cooling, and pelletizing, the masterbatch of oxazoline compounds is obtained.
Embodiment 1
[0063] Example 1: Preparation of modified PET copolyester with high viscosity, low carboxyl content, and good hot water resistance
[0064] Mix 1Kg P1, 20g 2-oxazolinylbenzene, and 6g hexamethylene diisocyanate in a high mixer, and then put them into a twin-screw extruder. The temperature of the extruder is 200-240°C. After extruding, drawing, water cooling and pelletizing, the modified PET copolyester P11 with high viscosity, low carboxyl content and good hot water resistance is obtained.
Embodiment 2
[0065] Example 2: Preparation of modified PET copolyester with high viscosity, low carboxyl content, and good hot water resistance
[0066] Mix 1Kg of P2, 8g of 1,3-bis(2-oxazolinyl)benzene, and 9g of ADR-4370S in a high-speed mixer, and then put them into a twin-screw extruder. The temperature of the extruder is 200-240°C. After extruding, drawing, water cooling and pelletizing, the modified PET copolyester P12 with high viscosity, low carboxyl content and good hot water resistance is obtained.
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Abstract
The invention belongs to the technical field of polyester preparation, and discloses a modified PET copolyester with high viscosity and a low terminal carboxyl group and a preparation method and application thereof. The copolyester contains the following ingredients in parts by weight: 100 parts of low-viscosity PET copolyester, 0.8-2.0 parts of oxazoline compound and 0.6-2.0 parts of a hydroxyl chain extender. The method prepares the high-viscosity modified PET copolyester by adding the oxazoline compound and the hydroxyl chain extender. The oxazoline compound is added to react with the terminal carboxyl group in resin, the terminal carboxyl group content of resin is reduced, therefore, the hot water resisting performance of resin is increased. The hydroxyl chain extender is added, the molecular weight of resin is increased, and the balance between a physical performance and a processing performance is achieved. The viscosity and the melt strength of the modified PET copolyester are increased, the content of terminal carboxyl group is reduced, and the hot water resisting performance is greatly increased. Moreover, the production method shortens the polycondensation time and the production cycle, effectively reduces the thermal degradation reaction, and also increases the output of equipment.
Description
technical field [0001] The invention belongs to the technical field of polyester preparation, and in particular relates to a modified PET copolyester with high viscosity and low carboxyl group and its preparation method and application. Background technique [0002] Every year tens of millions of tons of polyester plastic products are discarded in landfill or incinerated around the world. Disposal or incineration of polyester is harmful to the environment. Therefore, preparing biodegradable polyester instead of traditional polyester is an effective way to solve the above problems. The PET copolyester formed by the copolymerization of terephthalic acid, adipic acid and ethylene glycol has received extensive attention due to its good biodegradability, low production cost, good mechanical properties and processing properties. [0003] PET copolyester is mainly obtained through esterification, high temperature and high vacuum polycondensation reaction. In the later stage of t...
Claims
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