CN111849132A - A kind of high-strength cross-linked PBAT material and preparation method thereof - Google Patents

Abstract

The invention discloses a high-strength cross-linked polybutylene adipate terephthalate material, which is characterized in that: the raw material is composed of the following parts by mass: 100 parts of PBAT, 0.01-1 part of initiator, 0.5-2 part of silane, 0.01-1 part of co-crosslinking agent, 0.01-1 part of catalyst and 0-2 part of lubricant. The composite material provided by the present invention can be widely used in films, containers and other structural parts. The obtained product can not only ensure the quality, but also reduce the white pollution and meet the requirements of green environmental protection.

Description

A kind of high-strength cross-linked PBAT material and preparation method thereof

technical field

The invention belongs to the technical field of polymer materials, and designs a cross-linking enhanced biodegradable material polybutylene terephthalate (PBAT) and a preparation method thereof

Background technique

Polybutylene terephthalate adipate, English abbreviation PBAT, PBAT is a biodegradable high toughness biodegradable polymer polyester, is an excellent film material. However, the price of PBAT is more expensive than traditional petroleum-based non-biodegradable materials, about 3 times that of polyethylene materials. In order to reduce the cost, researchers blend it with lignin, inorganic powder, etc. to reduce its cost. This will lead to a decrease in the tensile strength of the PBAT composite, which affects the application of the PBAT composite.

In order to reduce the cost of PBAT, add a large amount of fillers and maintain the tensile strength of the application, the patent of the present invention invented a high-strength PBAT material from the raw material structure and processing technology.

SUMMARY OF THE INVENTION

The present invention provides a high-strength PBAT fully biodegradable material and a preparation method thereof. The tensile strength of the material is greatly improved, which provides the basis of structure and performance for high filling, which not only solves the problem of low strength of PBAT, but also provides PBAT reduces costs and provides a structural basis that enables the product to be used in a wide range of applications.

In order to achieve the above purpose, the present invention provides a high-strength cross-linked PBAT material and process, comprising the following components: 100 parts of PBAT, 0.01-1 part of initiator, 0.5-2 part of silane, and 0.01-1 part of auxiliary cross-linking agent, 0.01-1 part of catalyst, 0-2 part of lubricant. Processing temperature: 120-190℃.

The above technical solution provides the weight range of each component, and it can be understood that those skilled in the art can select within the above range as required.

Preferably, the initiator is a free radical initiator, such as DCP, BPO;

As a preference, the silanes are vinyltrimethoxysilane, vinyltrichlorosilane, vinyltriethoxysilane, vinyltris(methoxyethoxy)silane, vinyltri-tert-butylsilane, vinyl tri-tert-butylsilane, vinyltri-tert-butylperoxysilane, and vinyltriacetoxysilane.

Preferably, the auxiliary crosslinking agent includes: triallyl cyanurate (TAC), triallyl isocyanurate (TAIC) and the like.

Preferably, the catalyst includes: dibutyltin laurate, organic acid, inorganic acid, etc.; organic base, inorganic base, etc.;

Preferably, the lubricant includes stearic acid, calcium stearate, zinc stearate, oleic acid amide and the like.

The present invention improves a method for preparing a cross-linked PBAT material according to any of the above technical solutions, which includes the following steps: weighing pre-dried components by mass ratio, and mixing them in a high-speed mixer. Then enter the screw extruder, control the temperature to decrease at 120-190°C, the screw speed is determined according to the needs, extrude, pull, and obtain the film. Film thickness is as required.

In the above technical solutions, those skilled in the art can select parameters within the above ranges according to actual needs.

The present invention provides a cross-linked PBAT utilizing any one of the above technical solutions and its mixture with lignin, starch, wood flour, calcium carbonate, phosphogypsum, red mud, etc. ) environmentally friendly films, containers and other structural parts made of composite materials, such as: packaging films, mulching films, handbags, films for synthetic paper, disposable daily necessities, etc.

Compared with the prior art, the advantages and positive effects of the present invention are:

The invention provides a preparation method for preparing high-strength biodegradable PBAT material. The cross-linking agent forms a network structure between methylene groups in the PBAT molecule without affecting the biodegradability, the operation is simple, the process is stable, and continuous production is possible , to improve the thermal stability of the PBAT composite material, facilitate processing, and solve the problem of low strength of PBAT. The composite material provided by the present invention can be widely used in films, containers and other structural parts. The biodegradation of the obtained product can not only ensure the quality, but also reduce white pollution and meet the requirements of green environmental protection.

Detailed ways

In order to introduce the embodiments of the present invention in more detail and the provided preparation method of high-strength cross-linked PBAT, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described implementation is only Some, but not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Example 1

Formulation: 100 parts PBAT, 0.01 part DCP, 0.04 part vinyltriethoxysilane, 0.01 part TAC, 0.01 part dibutyltin laurate, 1 part stearic acid.

Preparation method: PBAT is placed in a vacuum drying box at 50° C. for 24 hours, and the above-mentioned raw materials are mixed uniformly in a high-speed mixer. Then it is extruded with a twin-screw extruder and drawn into a tablet. The extruder temperature was 130, 140, 150, 160, 170°C, and the rotation speed was 50 rpm.

Example 2

Formulation: 100 parts PBAT, 0.02 part DCP, 0.06 part vinyltrimethylsilane, 0.02 part TAIC, 0.02 part dibutyltin laurate, 2 parts stearic acid.

Preparation method: PBAT is placed in a vacuum drying box at 50° C. for 24 hours, and the above-mentioned raw materials are mixed uniformly in a high-speed mixer. Then it is extruded with a twin-screw extruder and drawn into a tablet. The extruder temperature was 120, 130, 140, 150, 160°C, and the rotation speed was 60 rpm.

Example 3

Formulation: 100 parts PBAT, 0.03 parts BPO, 0.08 parts vinyltriethoxysilane, 0.03 parts TAC, 0.03 parts dibutyltin laurate, 2 parts stearic acid.

Preparation method: PBAT is placed in a vacuum drying box at 50° C. for 24 hours, and the above-mentioned raw materials are mixed uniformly in a high-speed mixer. Then it is extruded with a twin-screw extruder and drawn into a tablet. The extruder temperature was 120, 130, 140, 150, 160°C, and the rotation speed was 70 rpm.

Example 4

Formulation: 100 parts PBAT, 0.04 part DCP, 0.12 part vinyltriethoxysilane, 0.03 part TAC, 0.03 part dibutyltin laurate, 1.5 part stearic acid.

Preparation method: PBAT is placed in a vacuum drying box at 50° C. for 24 hours, and the above-mentioned raw materials are mixed uniformly in a high-speed mixer. Then it is extruded with a twin-screw extruder and drawn into a tablet. The extruder temperature was 120, 125, 130, 135, 140°C, and the rotation speed was 40 rpm.

Example 5

Formulation: 100 parts PBAT, 0.1 part DCP, 0.4 part vinyltriethoxysilane, 0.1 part TAC, 0.1 part dibutyltin laurate, 2 parts stearic acid.

Preparation method: PBAT is placed in a vacuum drying box at 50° C. for 24 hours, and the above-mentioned raw materials are mixed uniformly in a high-speed mixer. Then it is extruded with a twin-screw extruder and drawn into a tablet. The extruder temperature was 120, 130, 140, 150, 160°C, and the rotation speed was 50 rpm.

Comparative Example 1

Formula: 100 parts PBAT, 1 part stearic acid.

Preparation method: PBAT is placed in a vacuum drying box at 50° C. for 24 hours, and the above-mentioned raw materials are mixed uniformly in a high-speed mixer. Then it is extruded with a twin-screw extruder and drawn into a tablet. The extruder temperature was 130, 140, 150, 160, 170°C, and the rotation speed was 50 rpm.

The films of the above examples and comparative examples were tested according to the test specifications of the films. The test results are as follows:

As can be seen from the data in the above table, the tensile strength and thermal stability of the PBAT material prepared by the method provided by the present invention have been greatly improved compared with the pure PBAT material. It can be seen that the role of the crosslinking agent, co-crosslinking agent, catalyst, lubricant, etc. in the formulation system in the selection and the proportioning system of parts by weight is finally reflected in the strength of the material, which can effectively Increase the tensile strength of PBAT.

Claims (8)

1. a high-strength cross-linked polybutylene adipate terephthalate material is characterized in that: its raw material composition mass parts are as follows: 100 parts of PBAT, 0.01-1 part of initiator, 0.5-2 part of silane, 0.01-1 part of crosslinking agent, 0.01-1 part of catalyst and 0-2 part of lubricant. 2 . The high-strength cross-linked polybutylene terephthalate material according to claim 1 , wherein the initiator is a free radical initiator, preferably DCP and BPO. 3 . 3. The high-strength cross-linked polybutylene terephthalate material according to claim 1, wherein the silane is vinyltrimethoxysilane, vinyltrichlorosilane, vinyltriethoxysilane, vinyltris(methoxyethoxy)silane, vinyltri-tert-butylsilane, vinyltri-tert-butylsilane, vinyltri-tert-butylperoxysilane, vinyltri Acetoxysilane, etc. 4. a kind of high-strength cross-linked polybutylene terephthalate material according to claim 1, is characterized in that: described auxiliary cross-linking agent comprises triallyl cyanurate or tri- Allyl isocyanurate. 5. a kind of high-strength cross-linked polybutylene adipate terephthalate material according to claim 1, is characterized in that: described catalyst comprises dibutyltin laurate, organic acid, inorganic acid, organic base and inorganic bases. 6. a kind of high-strength cross-linked polybutylene terephthalate material according to claim 1, is characterized in that: described lubricant comprises stearic acid, calcium stearate, stearic acid Zinc and Oleamide. 7. the preparation method of a kind of high-strength cross-linked polybutylene adipate terephthalate material as described in one of claim 1-6, it is characterized in that: each pre-dried component is weighed by mass parts Take, and mix in a high-speed mixer, then enter the screw extruder, control the temperature between 120-190 ° C, the screw speed is determined according to the needs, extrude, pull, and obtain the film. 8 . The method for preparing a high-strength cross-linked polybutylene terephthalate material according to claim 7 , wherein the rotational speed of the screw is preferably 40-70 rpm. 9 .