Lightweight polyethylene terephthalate with low fluidity and easy processing and preparation method thereof

A technology of polyethylene terephthalate and low fluidity, which is applied in the field of preparation of polyethylene terephthalate, and can solve the difficulties of extrusion swelling, yellowing of pellets, and melt extrusion and other problems, to achieve the effect of reducing the amount of use, reducing the pressure of melt extrusion, and reducing the cost of processing and modification

Active Publication Date: 2021-02-26
CHANGZHOU UNIV
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is: to overcome the deficiencies in the prior art, to provide a light-weight polyethylene terephthalate with low fluidity and easy to process and its preparation method, to make up for the increase of a single chain extender. Insufficient viscosity modification reduces the degradation of PET during processing, increases its molecular weight, and reduces its fluidity; while improving the mechanical properties of PET, carry out research on ease of processing and light weight, and then overcome the deepening of molecular viscosity. As a result, it is difficult to extrude the melt, the extrusion swelling is serious, and the yellowing of the pellets is obvious.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lightweight polyethylene terephthalate with low fluidity and easy processing and preparation method thereof
  • Lightweight polyethylene terephthalate with low fluidity and easy processing and preparation method thereof
  • Lightweight polyethylene terephthalate with low fluidity and easy processing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of preparation method of the polyethylene terephthalate that low fluidity is easy to process lightweight, its step is as follows:

[0028] (1) Use a silane coupling agent to modify the surface of the hollow floating beads: first weigh the particle size to 1-250μm, and the bulk density to 250-450kg / m 3 100g of the hollow floating beads for subsequent use, then weigh 1% silane coupling agent with a quality of hollow floating beads in a beaker, and prepare it into a 1% concentration of ethanol aqueous solution, the mass ratio of ethanol and water is 5:1 , adjust the pH value to 1 with acetic acid, stir at room temperature for 0.5h to fully hydrolyze the silane coupling agent, then put in the weighed hollow floating beads, ultrasonically mix for 0.5h and place it in a 40°C water bath mechanically After stirring and reacting for 1 hour, take it out and cool it to room temperature, then repeatedly suction-filter and wash the surface-modified hollow floating bead soluti...

Embodiment 2

[0032] A kind of preparation method of the polyethylene terephthalate that low fluidity is easy to process lightweight, its step is as follows:

[0033] (1) Use a silane coupling agent to modify the surface of the hollow floating beads: first weigh the particle size to 1-250μm, and the bulk density to 250-450kg / m 3 200g of the hollow floating beads for subsequent use, then weigh 2% of the hollow floating beads quality silane coupling agent in a beaker, and prepare it into a 5% concentration of ethanol aqueous solution, the mass ratio of ethanol and water is 6:1 , adjust the pH value to 3 with acetic acid, stir at room temperature for 1 hour to fully hydrolyze the silane coupling agent, then put in the weighed hollow floating beads, ultrasonically mix for 1 hour, and then place it in a 50°C water bath for mechanical stirring reaction After 2 hours, take it out and cool it down to room temperature, then repeatedly suction-filter and wash the surface-modified hollow floating bead...

Embodiment 3

[0037] A kind of preparation method of the polyethylene terephthalate that low fluidity is easy to process lightweight, its step is as follows:

[0038] (1) Use a silane coupling agent to modify the surface of the hollow floating beads: first weigh the particle size to 1-250μm, and the bulk density to 250-450kg / m 3 600g of the hollow floating beads are for subsequent use, then weigh 4% silane coupling agent with a quality of the hollow floating beads in a beaker, and prepare it into a 5% concentration of ethanol aqueous solution, and the mass ratio of ethanol and water is 7:1 , adjust the pH value to 4 with acetic acid, stir at room temperature for 1.5h to fully hydrolyze the silane coupling agent, then put in the weighed hollow floating beads, ultrasonically mix for 1.5h and place it in a 60°C water bath mechanically After stirring and reacting for 3 hours, take it out and cool it to room temperature, then repeatedly suction-filter and wash the surface-modified hollow floatin...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
melt flow indexaaaaaaaaaa
densityaaaaaaaaaa
particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention discloses polyethylene terephthalate with low fluidity, easy processing and light weight and a preparation method thereof. The melt flow rate of the polyethylene terephthalate is 35.3-14.7.0 g / 10 min, and the intrinsic viscosity is 0.84-1.310 dL / g. The invention adds hollow floating beads modified by silane coupling agent surface, mixed chain extender compounded by carboxyl addition type chain extender monomer and isocyanate chain extender monomer, antioxidant and heat stabilizer agent, and then granulated by screw extrusion to prepare polyethylene terephthalate. The preparation method is simple to operate, the reaction extrusion equipment takes up little space and can be produced continuously. The polyethylene terephthalate prepared by this method has the characteristics of large molecular weight, low fluidity, light weight, and easy extrusion of the melt. .

Description

technical field [0001] The invention belongs to the technical field of processing and modification of polyester polymers, and in particular relates to a preparation method of lightweight polyethylene terephthalate with low fluidity and easy processing. Background technique [0002] At present, PET is mainly used in the fields of film, beverage bottle and fiber in my country; the amount of engineering plastics only accounts for 1.6% of its total consumption, and almost all PET engineering plastics in the domestic market are imported. The reason is that, on the one hand, PET is easily degraded by water, heat, and oxygen during processing, resulting in lower molecular weight, lower viscosity, and difficulty in processing and molding; on the other hand, the application of PET in the field of engineering plastics needs to be further expanded. [0003] At present, PET chain extension methods include the following three methods: melt polycondensation method, solid phase polycondens...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/02C08K9/06C08K7/24C08K5/134C08G63/91
CPCC08G63/916C08K5/1345C08K7/24C08K9/06C08L67/02
Inventor 陶国良刘少峰夏艳平马文中唐睿刘春林
Owner CHANGZHOU UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap