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A kind of preparation method and application of pet nucleating additive modified and grafted with small glycol molecules

A technology of small molecules and glycols, which is applied in the field of preparation of PET nucleating additives modified and grafted with small molecules of glycols, can solve problems such as hindering molecular chain movement, high glass transition temperature, and large molecular chain rigidity. Achieve the effect of significant crystallization modification, increase crystallization rate, and easy alignment

Active Publication Date: 2019-01-25
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

PET molecules have high structural regularity and strong crystallization ability. However, due to the high rigidity of its molecular chain and high glass transition temperature, the movement of its molecular chain is hindered, so PET is only a semi-crystalline substance.
Aiming at the shortcomings of the slow crystallization speed of PET, people continue to study the modification of PET, and have continuously developed a variety of nucleating agents for rapid crystallization of PET, including inorganic nucleating agents, organic nucleating agents, and polymer nucleating agents. Nucleating agent, each nucleating agent has its own advantages and disadvantages

Method used

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  • A kind of preparation method and application of pet nucleating additive modified and grafted with small glycol molecules
  • A kind of preparation method and application of pet nucleating additive modified and grafted with small glycol molecules

Examples

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Embodiment 1

[0024] Such as figure 1 As shown, the present invention discloses a method for preparing a PET nucleating additive modified and grafted with glycol small molecules, comprising the following steps:

[0025] Glycol small molecule surface modified inorganic oxide nanoparticles: add 3.0g inorganic oxide nanoparticles (pre-dried for 24 hours in a vacuum oven at 80°C) in a 250mL three-necked flask, add 25mL benzene to make it Dissolve, protect with nitrogen, and add 25ml of thionyl chloride dropwise through a separatory funnel, then there will be HCl and SO 2 Generated and reacted at 65 degrees for 4 hours. Then the reaction mixture was centrifuged at 7000r / min for 7min. And wash with benzene three times, take 2.0g after vacuum drying and add to 20mL of toluene, add 20mL of small diol molecules under magnetic stirring, and react for 5 hours under nitrogen protection at 65°C. Finally, the reaction mixture was centrifuged at 7000r / min for 7min, and washed twice with toluene. In ord...

Embodiment 2

[0031] Such as figure 2 As shown, the present invention discloses a method for preparing a PET nucleating additive modified and grafted with glycol small molecules, comprising the following steps:

[0032] 1,5-pentanediol surface modified nano-silica: Add 3.0g nano-silica (pre-dried for 24 hours at 80°C in a vacuum oven) into a 250mL three-necked flask, add 25mL benzene to make it Dissolve, protect with nitrogen, and add 25ml of thionyl chloride dropwise through a separatory funnel, then there will be HCl and SO 2 Generated and reacted at 65 degrees for 4 hours. Then the reaction mixture was centrifuged at 7000r / min for 7min. And wash with benzene three times, after vacuum drying, take 2.0g and add to 20mL toluene, add 20mL 1,5-pentanediol under magnetic stirring, and react for 5 hours under nitrogen protection at 65°C. Finally, the reaction mixture was centrifuged at 7000r / min for 7min, and washed twice with toluene. In order to remove unreacted 1,5-pentanediol, it was wa...

Embodiment 3

[0037] Experimental purpose and method: In order to study the influence of the low molecular weight PET chain segment nucleating additive modified and grafted by diols on the crystallization kinetics of linear polyester crystallization, this example synthesized 1, 5-pentanediol modified and grafted low-molecular-weight PET segment nucleation additive was used as the experimental object to study its effect on the crystallization kinetics of linear polyester chips. The specific method was: using DSM Xplore 5&15 micro-blender The melt blending method is fully mixed, and a standard sample is made in a DSM Xplore 10cc micro-injection molding machine. The melting temperature in the blender is 290°C, the mold temperature in the injection molding machine is 50°C for pure linear polyester, and the 1,5-pentanediol modified and grafted low molecular weight PET segment nucleating additive synthesized in Example 2 is added Later changed to 40°C. A total of 1,5-pentanediol modified and gra...

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Abstract

The invention discloses a preparation method and application of a glycol small molecule modified and grafted PET (Polyethylene Terephthalate) nucleating additive. A glycol small molecule modified and grafted PET chain segment with low molecular weight is obtained by carrying out an overall design on PET and application requirements thereof, carrying out surface modification on inorganic oxide nanoparticles through utilizing glycol small molecules, and then grafting polyethylene terephthalate with low molecular weight; the chain segment has very good compatibility with most resin matrices; a polyester chain segment can be crystallized and nucleated, so that an excellent nucleating induction effect on a linear polyester resin matrix is realized; the glycol small molecule modified and grafted PET nucleating additive disclosed by the invention utilizes glycol chained inorganic nanoparticles with a relatively short molecule chain and polyester; a crystal form of the PET is not changed, and a crystal size and a crystallization capability of the PET are influenced, so that the oriented arrangement of molecule chains is easier, and a crystallization modification effect on the PET is more remarkable.

Description

technical field [0001] The invention relates to the field of PET modification, in particular to a preparation method and application of a PET nucleating additive modified and grafted with glycol small molecules. Background technique [0002] At present, PET has become the fastest-growing variety in the non-fiber field other than polyester for film and bottle use. It is widely used in industry, agriculture, national defense and people's daily life. In recent years, people have paid great attention to polyester and polyester modification. PET molecules have high structural regularity and strong crystallization ability. However, due to the high rigidity of its molecular chain and high glass transition temperature, the movement of its molecular chain is hindered, so PET is only a semi-crystalline substance. Aiming at the shortcomings of the slow crystallization speed of PET, people continue to study the modification of PET, and have continuously developed a variety of nucleatin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/91C08G63/183C08G83/00C08L67/00C08L67/02C08L87/00
CPCC08G63/183C08G63/916C08G83/001C08L67/00C08L2205/02C08L2205/24C08L67/02C08L87/005
Inventor 王瑶崔学伟唐建国刘继宪黄林军焦吉庆王彦欣王薇韩真真
Owner QINGDAO UNIV
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