CN111849114B

CN111849114B - Modified regenerated composite plastic and preparation method thereof

Info

Publication number: CN111849114B
Application number: CN201910350453.XA
Authority: CN
Inventors: 杨桂生; 计娉婷; 朱敏; 廖雄兵
Original assignee: Hefei Genius New Materials Co Ltd
Current assignee: Hefei Genius New Materials Co Ltd
Priority date: 2019-04-28
Filing date: 2019-04-28
Publication date: 2022-04-26
Anticipated expiration: 2039-04-28
Also published as: CN111849114A

Abstract

The invention discloses a modified recycled composite plastic and a preparation method thereof, wherein the modified recycled composite plastic comprises 96.2-99.6 parts of a recycled plastic mixture, 0.2-3 parts of a modifier, 0.1-0.5 part of an antioxidant and 0.1-0.3 part of a processing aid in parts by weight, and the modifier is added when the recycled composite plastic is recycled and granulated, so that the problems that the mechanical property of a recycled plastic part is poor and the use range and the service life of the recycled plastic part are influenced due to the problems of poor compatibility, different processing properties of various materials and the like in the mixed recycled plastic in the prior art are solved.

Description

Modified regenerated composite plastic and preparation method thereof

Technical Field

The invention belongs to the technical field of high polymer materials, and particularly relates to a modified recycled composite plastic and a preparation method thereof.

Background

With the increasing popularity of plastics, the treatment of plastic wastes is also the primary problem to be solved at present, and the common treatment method at present is incineration or landfill, but incineration and landfill not only bring serious environmental problems but also are regarded as a treatment method which wastes energy.

The recycling of the plastic is regarded as the most environment-friendly and economic mode at present, but generally the waste plastic products are generally composed of a plurality of materials due to the complexity of the products, wherein the products mainly comprising household appliances, automotive interior and exterior decorations and electronic and electrical parts are mainly formed by mixing and assembling PP, PE, ABS, PC or PC/ABS and the like, and as the materials have different processing performances and poor compatibility, the classification is not thorough, and impurities are easy to mix; and because of poor compatibility, the final recycled plastic product has poor mechanical properties, and the use range and the service life of the final recycled plastic product are influenced.

Disclosure of Invention

Based on the above, the invention provides a modified recycled composite plastic, wherein 4-epoxy methyl-3-phenylpiperazine-1-tert-butyl carboxylate is used as a modifier and is added during recycling granulation of the recycled composite plastic, so that the problems that in the prior art, the mechanical property of a recycled plastic product is poor due to the problems of poor compatibility, different processing properties of various materials and the like in mixed recycled plastics, so that the application range and the service life of the recycled plastic product are influenced are solved.

In order to achieve the purpose, the invention adopts the following technical scheme:

a modified regenerated composite plastic comprises the following components in parts by weight:

wherein the modifier is 4-epoxy methyl-3-phenylpiperazine-1-carboxylic acid tert-butyl ester.

Furthermore, the recycled plastic mixture is formed by mixing at least two of PP, PE, ABS, PC and PC/ABS materials according to any proportion.

Further, the antioxidant is at least one of hindered phenol antioxidant and phosphite antioxidant. The hindered phenol antioxidant may be 1010 or 1076, and the phosphite antioxidant may be 168, which are given by way of example only and will not be described in detail.

Further, the processing aid is a silicone dispersant, stearic acid complex lipid and erucamide lubricant.

The invention also aims to provide a preparation method of the modified recycled composite plastic, which comprises the following steps:

uniformly mixing the regenerated plastic mixture, the modifier 4-epoxy methyl-3-phenylpiperazine-1-tert-butyl carboxylate, the antioxidant and the processing aid according to the proportion to obtain a mixed material;

and carrying out melt extrusion, granulation and drying on the mixed material to obtain the modified regenerated composite plastic.

Further, the melt extrusion is performed in a twin screw extruder.

Preferably, the working temperature of each section of the double-screw extruder is 250-290 ℃, and the screw rotating speed is 200-300 r/min.

Compared with the prior art, the invention has the following beneficial effects:

the 4-epoxy methyl-3-phenylpiperazine-1-tert-butyl carboxylate is used as a modifier and is added when the regenerated composite plastic is recycled and granulated, the modifier can react with carboxyl and hydroxyl in PC, ABS and PC/ABS in the processing process to generate ester groups and ether groups with more stable chemical properties, and meanwhile, methyl groups in the modifier can be combined with olefin substances through hydrogen bonds, so that the composite material has a better cross-linking structure and lower interfacial energy, the mechanical properties of the regenerated composite plastic are improved, economical and practical regenerated composite plastic products are prepared, and the prepared regenerated composite material has excellent mechanical properties.

Meanwhile, as the common recycled plastics have different processing performances and poorer compatibility, the complex treatment processes of disassembly and classification are required before recycling, and the processes are usually finished manually, the efficiency is extremely low, the classification is not thorough, and partial impurities are easy to mix.

Detailed Description

In order that the invention may be more fully understood, reference will now be made to the specific embodiments illustrated. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In the following examples, the recycled plastic mixture was obtained from commercially available household electrical appliances and recycled scrap of automotive interior products, and other auxiliaries were commercially available, wherein the CAS number of the modifier, tert-butyl 4-epoxymethyl-3-phenylpiperazine-1-carboxylate, was 904815-90-3.

Example 1

Uniformly mixing 98.1 parts of weighed regenerated plastic mixture (containing 23.40% of PP, 1.27% of PE and 73.43% of ABS), 1.5 parts of modifier 4-epoxy methyl-3-phenylpiperazine-1-carboxylic acid tert-butyl ester, 10100.2 parts of antioxidant and 0.2 part of processing aid calcium stearate in a high-speed mixer to obtain a mixed material;

placing the mixed material in a double-screw extruder, wherein the processing temperature of each section is as follows: and carrying out melt extrusion, granulation and drying under the conditions of 250 ℃ in the first zone, 255 ℃ in the second zone, 270 ℃ in the third zone, 270 ℃ in the fourth zone, 270 ℃ in the fifth zone, 270 ℃ in the sixth zone, 270 ℃ in the seventh zone, 260 ℃ in the eighth zone, 260 ℃ in the ninth zone and the screw rotation speed of 250r/min to prepare the modified regenerated composite plastic.

Example 2

Uniformly mixing 97.45 parts of weighed recycled plastic mixture (containing 52.52% of PP, 16.43% of ABS and 28.50% of PC), 2 parts of modifier 4-epoxy methyl-3-phenylpiperazine-1-carboxylic acid tert-butyl ester, 10760.3 parts of antioxidant and 5250.25 parts of processing aid silicone E in a high-speed mixer to obtain a mixed material;

placing the mixed material in a double-screw extruder, wherein the processing temperature of each section is as follows: the first zone is 260 ℃, the second zone is 270 ℃, the third zone is 280 ℃, the fourth zone is 280 ℃, the fifth zone is 290 ℃, the sixth zone is 290 ℃, the seventh zone is 280 ℃, the eighth zone is 270 ℃, the ninth zone is 270 ℃ and the screw rotation speed is 220 r/min.

Example 3

Uniformly mixing 96.95 parts of weighed regenerated plastic mixture (containing 40.31% of PP, 23.78% of PE and 32.86% of PC), 2.5 parts of modifier 4-epoxy methyl-3-phenylpiperazine-1-carboxylic acid tert-butyl ester, 10100.2 parts of antioxidant, 1680.2 parts of antioxidant and 0.1 part of processing aid zinc stearate in a high-speed mixer to obtain a mixed material;

placing the mixed material in a double-screw extruder, wherein the processing temperature of each section is as follows: melting and extruding under the conditions of 250 ℃ in the first zone, 255 ℃ in the second zone, 270 ℃ in the third zone, 270 ℃ in the fourth zone, 270 ℃ in the fifth zone, 270 ℃ in the sixth zone, 270 ℃ in the seventh zone, 260 ℃ in the eighth zone, 260 ℃ in the ninth zone and the rotating speed of a screw rod of 280r/min, granulating and drying to prepare the modified regenerated composite plastic.

Example 4

Uniformly mixing 99.6 parts of weighed regenerated plastic mixture (containing 36.94% of PP, 8.56% of PE, 11.28% of ABS and 42.82% of PC), 0.2 part of modifier 4-epoxy methyl-3-phenylpiperazine-1-tert-butyl carboxylate, 10760.1 parts of antioxidant, 0.1 part of processing aid silicone and 0.2 part of erucamide in a high-speed mixer to obtain a mixed material;

placing the mixed material in a double-screw extruder, wherein the processing temperature of each section is as follows: the first zone is 260 ℃, the second zone is 260 ℃, the third zone is 270 ℃, the fourth zone is 270 ℃, the fifth zone is 270 ℃, the sixth zone is 270 ℃, the seventh zone is 270 ℃, the eighth zone is 270 ℃, the ninth zone is 270 ℃, and the screw rotation speed is 200 r/min.

Example 5

Uniformly mixing 96.2 parts of weighed recycled plastic mixture (containing 54.18% of PP, 28.40% of ABS and 13.62% of PC), 3 parts of modifier 4-epoxy methyl-3-phenylpiperazine-1-tert-butyl carboxylate, 10100.2 parts of antioxidant, 10760.3 parts of antioxidant and 5250.3 parts of processing aid silicone E in a high-speed mixer to obtain a mixed material;

placing the mixed material in a double-screw extruder, wherein the processing temperature of each section is as follows: carrying out melt extrusion, granulation and drying on the materials under the conditions of 250 ℃ in the first zone, 255 ℃ in the second zone, 270 ℃ in the third zone, 270 ℃ in the fourth zone, 270 ℃ in the fifth zone, 270 ℃ in the sixth zone, 270 ℃ in the seventh zone, 260 ℃ in the eighth zone, 260 ℃ in the ninth zone and the rotation speed of a screw rod of 300r/min to prepare the modified regenerated composite plastic.

Comparative example 1

Uniformly mixing 99.2 parts of weighed regenerated plastic mixture (containing 54.18% of PP, 28.40% of ABS and 13.62% of PC), 10100.2 parts of antioxidant, 10760.3 parts of antioxidant and 5250.3 parts of processing aid silicone E in a high-speed mixer to obtain a mixed material;

Comparative example 2

Uniformly mixing 99.6 parts of the weighed regenerated plastic mixture (containing 23.40% of PP, 1.27% of PE and 73.43% of ABS), 10100.2 parts of antioxidant and 0.2 part of processing aid calcium stearate in a high-speed mixer to obtain a mixed material;

The detection performance of the modified recycled composite plastics prepared in the examples 1-5 and the comparative examples 1-2 according to the relevant ISO standard test method is shown in the following table:

	tensile strength/MPa	Flexural Strength/MPa	Impact strength KJ/m of simply supported beam gap²
				Standard of merit	ISO 527	ISO 178	ISO 180
Example 1	54	72	14
				Example 2	58	83	16
Example 3	52	79	13
				Example 4	48	77	15
Example 5	67	86	15
				Comparative example 1	14	24	4
Comparative example 2	12	28	3

As can be seen from the test results in the table above, the modified recycled composite plastic prepared by the invention has greatly improved rigidity and toughness due to the addition of the modifier 4-epoxy methyl-3-phenylpiperazine-1-carboxylic acid tert-butyl ester, can greatly expand the application field of the recycled composite plastic, and has profound significance in the aspects of industrial green and environmental protection. And the preparation method of the invention is only blending melt extrusion, compared with the traditional recycled plastic recovery process, the steps are simple, and the processing efficiency can be greatly improved.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The modified recycled composite plastic is characterized by comprising the following components in parts by weight:

96.2 to 99.6 parts of recycled plastic mixture,

0.2 to 3 parts of a modifier,

0.1 to 0.5 part of antioxidant,

0.1 to 0.3 portion of processing aid,

wherein the recycled plastic mixture is formed by mixing at least two of PP, PE, ABS, PC and PC/ABS materials according to any proportion; the modifier is 4-epoxy methyl-3-phenylpiperazine-1-tert-butyl carboxylate.

2. The modified recycled composite plastic of claim 1, wherein the antioxidant is at least one of hindered phenol antioxidants and phosphite antioxidants.

3. The modified recycled composite plastic of claim 1, wherein the processing aid is silicone dispersant, stearic acid complex lipid, erucamide lubricant.

4. The preparation method of the modified recycled composite plastic as claimed in any one of claims 1 to 3, characterized by comprising the following steps:

5. The method of claim 4, wherein the melt extruding is performed in a twin screw extruder.

6. The method according to claim 5, wherein the twin-screw extruder has a working temperature of 250 to 290 ℃ and a screw rotation speed of 200 to 300r/min for each stage.