Polyester tackifying/nucleating special auxiliary agent, preparation thereof and application thereof in PET modification

A technology of polyester and nucleation, which is applied in the field of polyester viscosifying/nucleating special additives and its preparation and application in PET modification, which can solve the problems of long injection molding cycle, low crystallization rate, and few injection molding, etc. problems, to achieve low cost, improve molding performance, improve mechanical properties and heat resistance

Active Publication Date: 2019-08-27
ZHEJIANG JINLIDA NEW MATERIAL TECH CO LTD
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AI-Extracted Technical Summary

Problems solved by technology

[0005] On the other hand, although PET is cheap, it is rarely used for injection mol...
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Method used

Others are with embodiment 1, but nano-SiO2 is changed into nano-TiO2 (Wanjing New Material Co., Ltd., VK-T03). The results show that the characteristic viscosity number of PET increases from 0.45 to 0.91, and the viscosity-increasing effect is obvious, indicating that not only nano-SiO2, but also other nanoparticles whose surface can be modified with epoxy groups can be used for PET chain extension and viscosity-increasing. The...
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Abstract

The invention discloses a polyester tackifying/nucleating special auxiliary agent, preparation thereof and application thereof in PET modification. The polyester tackifying/nucleating special auxiliary agent is inorganic nonmetal particles with functional groups and short-chain alkyl groups on the surfaces, wherein the inorganic nonmetal particles are obtained by conducting surface modification oninorganic nonmetal particles through a silane coupling agent; the silane coupling agent is composed of at least one silane coupling agent with the function groups at the terminals and at least one silane coupling agent with the short-chain alkyl groups at the terminals, the functional groups are groups capable of reacting with -OH or -COOH at polyester molecular chain terminals, and the carbon number of the short-chain alkyl groups is 3-8; the surfaces of the inorganic nonmetal particles contain hydroxyl groups or carboxyl groups, and the particle size of the inorganic nonmetal particles is within the range of 10-200 nm. By means of the auxiliary agent, polyester tackifying and induced crystallization nucleation can be achieved simultaneously. The invention further provides a PET modification method which is simple, low in cost and capable of achieving PET tackifying and induced crystallization nucleation simultaneously.

Technology Topic

PolyesterSilane coupling +8

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  • Polyester tackifying/nucleating special auxiliary agent, preparation thereof and application thereof in PET modification
  • Polyester tackifying/nucleating special auxiliary agent, preparation thereof and application thereof in PET modification

Examples

  • Experimental program(6)
  • Comparison scheme(5)

Example Embodiment

[0039] Example 1:
[0040] Mix 240mL deionized water, 60mL industrial alcohol, 30g SiO 2 (Wanjing New Materials Co., Ltd., VK-SP30), 0.261g γ-(2,3-epoxypropoxy)propyltrimethoxysilane (KH-560) (Aladdin Shanghai Biochemical Co., Ltd.), 0.710g positive Octyltriethoxysilane (KH-832) (Aladdin Shanghai Biochemical Co., Ltd.) (molar ratio of the two siloxanes is 3:7), mix well under mechanical stirring, and then adjust the pH with 10wt% dilute hydrochloric acid When the value reaches 4, stir at room temperature for 6 hours to obtain a nano slurry with a solid content of 10 wt%. Centrifuge the obtained nano-slurry (10000rpm, desktop high-speed centrifuge, H/T16MM, Hunan Hexi Instrument Equipment Co., Ltd.), and dry the precipitate obtained by centrifugation in a blast oven at 80°C for 12 hours to obtain modified nano-SiO 2 Particles.
[0041] The modified nano SiO 2 The granules are added to PET (Wahaha purified water bottle material), the addition amount is 1wt% of the amount of PET, mixed evenly, and then added to the torque rheometer (RM-200A, Harbin Harbin Harbin Electric Co., Ltd.). 5min. Obtain modified PET with uniformly dispersed nanoparticles, test the viscosity increasing effect with Ubbelohde viscometer (GB/T 1632-93, solvent is phenol/tetrachloroethane = 1/1, mass ratio), test the crystallization effect with DSC . The results showed that the characteristic viscosity of PET increased from 0.45 to 0.93, and the viscosity increasing effect was obvious. The crystallinity increased from 34.7% to 36.2%.

Example Embodiment

[0046] Example 2:
[0047] Others are the same as in Example 1, but will modify nano SiO 2 The addition amount of particles in PET was changed to 2wt% to obtain modified PET, and the effects of viscosity increasing and crystallization induction were measured. The results showed that the characteristic viscosity of PET increased from 0.45 to 0.96, and the viscosity increasing effect was obvious. The crystallinity increased from 34.7% to 37.7%.

Example Embodiment

[0054] Example 3:
[0055] Others are the same as in Example 1, but the method of preparing nano-slurry is changed to: pour the slurry whose pH value has been adjusted by dilute hydrochloric acid into a planetary ball mill (Nanjing University Instrument Factory, QM-3SP2) for ball milling. The ball milling conditions are: zirconium beads diameter 0.5 mm, mass 350g, rotation speed 350rpm, ball milling time is 5h to obtain nano slurry, after spray drying (190℃, slurry inlet rate is 5mL/min), modified nano SiO 2 After the pellets are melted and mixed with PET, the effect of PET thickening and crystallization induction is measured. The results showed that the characteristic viscosity of PET increased from 0.45 to 0.98, and the viscosity increasing effect was obvious. The degree of crystallinity increased from 34.7% to 37.2%.

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Description & Claims & Application Information

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