A kind of highly active, low residue, degradable chain extender and preparation method thereof

A technology of chain extender and degradable resin, applied in the field of high activity, degradable chain extender and its preparation, low residue field, can solve the problems of difficult to achieve grafting rate, high monomer residue, difficulty in feeding, etc., to achieve broad application Prospect and industrial value, high epoxy content, cost-effective effect

Active Publication Date: 2022-05-31
FINE BLEND POLYMER SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this paper, a large amount of ester monomers are used, which pollutes the environment, is difficult to feed, and has high residual monomers.
And research common sense shows that it is difficult to achieve a grafting rate of more than 5% through the monomer grafting method

Method used

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  • A kind of highly active, low residue, degradable chain extender and preparation method thereof
  • A kind of highly active, low residue, degradable chain extender and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Weigh 60% of polylactic acid resin and 40% of glycidyl methacrylate copolymer SG-15 as mixed material by weight percentage; add the mixed material to the twin-screw extruder for melt extrusion, and granulate to obtain granular products (i.e. PLA-g-GMA copolymer material). In this scheme, the temperature of the co-rotating twin-screw extruder is 140°C, 160°C, 180°C, 200°C, 200°C, 200°C, 200°C, 220°C, 200°C, 200°C, 200°C, 190°C. The length-diameter ratio of the twin-screw was 35, and the screw speed was 300 rpm. A melt grafting reaction is carried out. After dicing and post-processing, a poly(lactic acid)-based graft product is obtained. The epoxy content and terminal carboxyl group concentration of the samples are shown in Table 1.

Embodiment 2

[0044] Take by weight 70% of polylactic acid resin, 30% of glycidyl methacrylate copolymer SG-30 as mixed material; add mixed material to twin-screw extruder for melt extrusion, granulation to obtain granular product (i.e. PLA-g-GMA copolymer material). In this scheme, the temperature of the co-rotating twin-screw extruder is 140°C, 160°C, 180°C, 200°C, 200°C, 200°C, 200°C, 220°C, 200°C, 200°C, 200°C, 180°C. The length-diameter ratio of the twin-screw was 45, and the screw speed was 400 rpm. A melt grafting reaction is carried out. After dicing and post-processing, a poly(lactic acid)-based graft product is obtained. The epoxy content and terminal carboxyl group concentration of the samples are shown in Table 1.

Embodiment 3

[0046] Take by weight polylactic acid resin 80%, glycidyl methacrylate copolymer SG-60 20% as mixed material; add mixed material to twin-screw extruder for melt extrusion, granulation to obtain granular product (i.e. PLA-g-GMA copolymer material). In this scheme, the temperature of the co-rotating twin-screw extruder is 140°C, 150°C, 180°C, 200°C, 200°C, 200°C, 200°C, 220°C, 200°C, 200°C, 200°C, 180°C. The length-diameter ratio of the twin-screw was 55, and the screw speed was 500 rpm. A melt grafting reaction is carried out. After dicing and post-processing, a poly(lactic acid)-based graft product is obtained. The epoxy content and terminal carboxyl group concentration of the samples are shown in Table 1.

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Abstract

The invention discloses a high-activity, low-residue, degradable chain extender and a preparation method thereof; it comprises the following components: degradable resin: 60-80 parts; glycidyl methacrylate copolymer: 40-20 parts . The preparation of the chain extender includes the following steps: mix the raw materials uniformly through a mixer, then feed them into a twin-screw extruder, adjust the temperature range to 140-220°C, and melt under the conditions of a screw speed of 200-500rpm Grafting reaction, extrusion granulation. Compared with the prior art, the present invention adopts the degradable resin as the base material, which ensures the degradability of the chain extender; the chain extender of the present invention has a high epoxy content, and the chain extender is modified by adding the degradable resin When the time is right, the amount of addition is appropriate, and it is easy to disperse evenly. The preparation method of the invention has no monomer pollution, is simple and easy to implement, and is easy to industrialized production; it can be widely used in fields such as secondary modification of degradable resins, and has very broad application prospects and industrial value.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a high-activity, low-residue, degradable chain extender and a preparation method thereof. Background technique [0002] Polylactic acid (PLA) is a non-toxic and non-irritating synthetic polymer material. Its raw material is lactic acid, mainly from the fermentation of starch (such as corn, rice), etc. It can also be made of cellulose, kitchen waste or fish waste as raw materials Obtain. PLA has a wide range of raw materials, and the products made from it can be directly composted after use, which can eventually completely reduce CO2 and H2O to meet the requirements of sustainable development. PLA is mainly used in disposable products such as disposable tableware and packaging materials. [0003] Polylactic acid has poor material toughness and high material cost, which limit the practical application of PLA. In practical applications, PLA is often modified by filling ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G81/02
CPCC08G81/027Y02W90/10
Inventor 朱从山史鹏伟汤俊杰段浩
Owner FINE BLEND POLYMER SHANGHAI CO LTD
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