阅读说明：本技术 一种回收利用混杂pet制备合金的方法 (Method for preparing alloy by recycling hybrid PET ) 是由 吴驰飞 毛亚鹏 李秋影 曹伟 魏守超 蔡嘉峰 王应青 于 2019-09-18 设计创作，主要内容包括：本发明提供了一种回收利用混杂PET制备合金的方法,通过低温固相挤出,混杂料中各组分配比的调控,以及相容剂等的选用方面的改进,实现了与PET混杂材料与合金其他相的均匀分散,形成物理交联点,增加材料的强刚度。相比较传统的回收方式需要前期的分离提纯,成本高,能耗高,有二次污染、操作困难等的缺点,本发明提供的方法无需分离混杂PET中的其他组分,节省能源,回收方便。制得的合金性能高,利用范围广泛。(The invention provides a method for preparing alloy by recycling hybrid PET, which realizes the uniform dispersion of the hybrid PET material and other phases of the alloy, forms physical cross-linking points and increases the strong rigidity of the material by low-temperature solid phase extrusion, regulation and control of the component ratios in the hybrid material, and improvement on the selection of compatilizer and the like. Compared with the traditional recovery mode which needs the previous separation and purification, the method has the defects of high cost, high energy consumption, secondary pollution, difficult operation and the like. The prepared alloy has high performance and wide application range.)

1. A method of recycling hybrid PET to make an alloy, comprising:

1) drying the recovered PET mixed material, the matrix, the compatilizer and the antioxidant;

2) mixing PET: matrix: a compatilizer: 70-90: 10-30: mixing the raw materials in a mass ratio of 1-10:5-10 to obtain a mixture;

3) extruding the mixture using an extruder;

4) water-cooling granulation;

5) and drying again to obtain the alloy particles.

6) And obtaining the alloy sample strip through injection molding.

2. The process according to claim 1, wherein the PET hybrid comprises a plastic material mixed with PET selected from the group consisting of: PE, PP, CPE, PA₆One or more of (a).

3. The method of claim 1, wherein the substrate is selected from the group consisting of: PE, PP, CPE, PA₆One or more of (a).

4. The method of claim 1, wherein the compatibilizing agent is selected from the group consisting of: POE-g-MAH, LDPE-g-MAH, EVA-g-MAH, EPDM-g-MAH, POE-g-GMA, LDPE-g-GMA, EVA-g-GMA, EPDM-g-GMA.

5. The method of claim 1, wherein the antioxidant comprises an antioxidant primary agent and an antioxidant auxiliary agent, and the antioxidant primary agent is selected from the group consisting of: AO-80, DPN; the antioxidant auxiliary agent is DLTP.

6. The method as set forth in claim 1, wherein the drying process of the PET compound in the step 1 is drying at 120 ℃ for 4 hours.

7. The method as claimed in claim 1, wherein the extruder is a twin-screw extruder, wherein the temperature distribution of each section is 60-260 ℃ and the temperature of the injection molding is 260-280 ℃; preferably, the double-screw extruder comprises a main material inlet, an auxiliary material inlet and a machine head outlet, the extruder is divided into seven heating sections between a main material feed inlet and the machine head outlet of the extruder, the main material feed inlet and the auxiliary material inlet are positioned in a first heating section, the machine head outlet is positioned in a seventh heating section, the temperature of the first heating section is 60-120 ℃, the temperature of the second heating section is 120-180 ℃, the temperature of the third heating section is 180-plus-220 ℃, the temperatures of the fourth-sixth heating sections are 220-plus-240 ℃, and the temperature of the seventh heating section is 240-plus-260 ℃.

8. The method of claim 8, wherein the mixture of the matrix, the compatibilizer and the antioxidant is added from the main material inlet, the PET blending material is added from the auxiliary material inlet, the auxiliary material port is a forced feeding hopper for adding the PET blending material, and the PET blending material is a crushed material of the blending material and has a diameter of 3-10 mm; preferably, the auxiliary agent and the PET mixed material are added from the auxiliary material inlet, the mass of the auxiliary agent is 8-20% of that of the mixture, and the auxiliary agent is composed of 50-55% of isopropenyl triethoxysilane, 35-40% of dicumyl peroxide, 4-8% of dibutyltin dilaurate and 2-4% of triethylene diamine.

9. The method of claim 9 wherein said third heating zone is provided with vents through which a portion of PET compound is added, said portion of PET compound having a mass of 30-50% of said PET compound, said portion of PET compound being continuous sliver PET compound fibers.

Technical Field

The invention relates to a PET (polyethylene terephthalate) recovery process, in particular to a method for preparing an alloy by recycling a mixed PET material.

Background

The application of the current plastics has penetrated into all aspects of production and social life, and the PET (polyethylene terephthalate) polyester has wide application in human production and life, and can be used as packaging containers of drinks and foods and the like, fiber-grade polyester, polyester films, engineering plastics and the like. Waste products, leftover materials and the like are inevitably generated in the production process of the PET polyester; in addition, the waste generated after the use of the PET polyester and the waste plastic are necessary products in the consumption process of plastic products, are a form of material resources, and have certain utilization value, for example, the waste plastic can be effectively utilized, so that the energy can be saved, the environment can be purified, and the method has great social significance. Most of PET reclaimed materials are mixed materials of PET and other plastics, such as PP, PE, PA and the like, and the traditional reclaiming mode needs early separation and purification, so the cost is high, the energy consumption is high, and the operation is difficult. Meanwhile, alloy products prepared by utilizing reclaimed materials have defects in the aspects of mechanical strength, toughness and the like, so that the research on a mode which can produce high-quality alloy products without separation and purification is one of the current research focuses.

Disclosure of Invention

The invention provides a method for preparing alloy by recycling hybrid PET, which realizes the uniform dispersion of the hybrid PET material and a matrix phase, forms physical cross-linking points and increases the strong rigidity of the material by low-temperature solid phase extrusion, regulation and control of the component ratios in the hybrid material, and improvement on the selection aspect of compatilizer and the like. Compared with the traditional recovery mode which needs the previous separation and purification, the method has the defects of high cost, high energy consumption and difficult operation, the method provided by the invention does not need to separate other components in the mixed PET, saves energy and is convenient to recover. The prepared alloy has high performance and wide application range.

Furthermore, the inventor also finds that the product performance is improved by adding the auxiliary agent with a specific proportion; the auxiliary agent can further improve the compatibility of each component in the mixed material, promote the formation of physical cross-linking points in the material and improve the toughness and the strong rigidity of the material;

the specific scheme is as follows:

a method of recycling hybrid PET to make an alloy, comprising:

1) drying the recovered PET mixed material, the chain extender, the compatilizer and the antioxidant;

2) mixing PET: matrix: a compatilizer: 70-90% of antioxidant: mixing the materials according to the mass ratio of 10-30:1-5:5-10 to obtain a mixture;

3) extruding the mixture using an extruder;

4) water-cooling granulation;

5) and drying again and performing injection molding to obtain the alloy sample strip.

Further, in the PET mixed material, the plastic mixed with the PET is selected from: PE, PP, CPE, PA₆One or more of (a).

Further, the compatibilizer is selected from: POE-g-MAH, LDPE-g-MAH, EVA-g-MAH, EPDM-g-MAH, POE-g-GMA, LDPE-g-GMA, EVA-g-GMA, EPDM-g-GMA.

Further, the antioxidant comprises an antioxidant main agent and an antioxidant auxiliary agent, wherein the antioxidant main agent is selected from the following components: AO-80, DPN; the antioxidant auxiliary agent is DLTP.

Further, the drying process of the PET mixed material in the step 1 is drying at 120 ℃ for 4 hours.

Further, the extruder is a double-screw extruder, wherein the temperature distribution of each section is 60-260 ℃, and the injection molding temperature is 260-280 ℃.

Further, the double-screw extruder comprises a main material inlet, an auxiliary material inlet and a machine head outlet, the extruder is divided into seven heating sections between a main material feed inlet and the machine head outlet of the extruder, the main material feed inlet and the auxiliary material inlet are positioned in a first heating section, the machine head outlet is positioned in a seventh heating section, the temperature of the first heating section is 60-120 ℃, the temperature of the second heating section is 120-180 ℃, the temperature of the third heating section is 180-220 ℃, the temperature of the fourth-sixth heating sections is 220-240 ℃, and the temperature of the seventh heating section is 240-260 ℃.

Furthermore, a mixture of the matrix, the compatilizer and the antioxidant is added from the main material inlet, an auxiliary agent and a PET mixed material are added from the auxiliary material inlet, the mass of the auxiliary agent is 8-20% of that of the mixture, and the auxiliary agent consists of 50-55% of isopropenyl triethoxysilane, 35-40% of dicumyl peroxide, 4-8% of dibutyltin dilaurate and 2-4% of triethylene diamine. The auxiliary material port is a forced feeding hopper for adding PET mixed materials, and the PET mixed materials are broken PET mixed materials with the diameter of 3-10 mm.

Further, an exhaust port is formed in the third heating section, part of the PET mixed materials is added through the exhaust port, the mass of the part of the PET mixed materials is 30-50% of that of the PET mixed materials, and the part of the PET mixed materials is continuous long-strip PET mixed fibers.

The invention has the following beneficial effects:

1. through low-temperature solid phase extrusion, regulation and control of the proportion of each component in the mixed material, improvement in the aspects of selection of compatilizer and the like, uniform dispersion of the mixed material and the PET in a PET organism is realized, physical cross-linking points are also formed, and the strong rigidity of the material is increased;

2. the auxiliary agent can further improve the compatibility of each component in the mixed material, promote the formation of physical cross-linking points in the material and improve the toughness and the strong rigidity of the material;

3. the PET mixed fiber added into the vent holes can improve the strength of the material.

4. PET (polyethylene terephthalate) hybrid fibers are added through an exhaust port in the middle of the extruder, so that the fibers can be dispersed, and meanwhile, the fibers are prevented from being cut by a screw, and the performance of a product is effectively improved;

5. other components in the mixed PET do not need to be separated, so that the energy is saved and the recovery is convenient.

The alloy prepared by the method has the advantages of high performance, wide application range, simple process, low cost and easy large-scale production.

Detailed Description

The present invention will be described in more detail with reference to specific examples, but the scope of the present invention is not limited to the examples.