CN109651793B

CN109651793B - Noise-reducing and silencing PC/polyester alloy material and preparation method thereof

Info

Publication number: CN109651793B
Application number: CN201811573801.1A
Authority: CN
Inventors: 肖有游; 薛成亮; 王晓明; 付顺成
Original assignee: Jinyoung Xiamen Advanced Materials Technology Co Ltd
Current assignee: Jinyoung Xiamen Advanced Materials Technology Co Ltd
Priority date: 2018-12-21
Filing date: 2018-12-21
Publication date: 2021-02-05
Anticipated expiration: 2038-12-21
Also published as: CN109651793A

Abstract

The invention provides a noise-reducing and silencing PC/polyester alloy material and a preparation method thereof, wherein the noise-reducing and silencing PC/polyester alloy material comprises, by weight, 35-65 parts of polycarbonate, 15-40 parts of polyester resin, 15-30 parts of thermoplastic elastomer, 0.2-0.5 part of antioxidant and 0.2-0.5 part of lubricant. The PC/polyester alloy material provided by the invention has good solvent resistance and good noise reduction effect, can be applied to the fields of electric tools, automobiles, household appliances and the like, and has obvious technical and market values.

Description

Noise-reducing and silencing PC/polyester alloy material and preparation method thereof

Technical Field

The invention relates to modification of a PC/polyester alloy material, in particular to a noise-reducing and silencing PC/polyester alloy material and a preparation method thereof.

Background

PC (polycarbonate)/PBT (polybutylene terephthalate) is a plastic alloy, which keeps the chemical resistance and the easy forming characteristics of a crystalline material PBT, and has the toughness and the dimensional stability of an amorphous material PC. The product is widely applied to automobile bumpers, automobile handles, electronic components and the like. At present, PC/PBT modification technologies mainly comprise the following types: flame retardant modification, enhancement modification, compatibility modification, antistatic modification, heat-resistant modification and low-temperature resistance modification, and the noise reduction and silencing functions of the material are not modified. For example, Chinese patent CN104693768 discloses a PC/PBT alloy material, a preparation method and an application thereof, wherein the PC/PBT alloy material with good low temperature resistance is prepared by 50-70 parts by weight of PC, 20-30 parts by weight of PBT, 2-6 parts by weight of SEBS, 5-15 parts by weight of a toughening agent (polysiloxane-methyl methacrylate copolymer) and other processing aids, but the alloy does not have the performance of noise reduction and noise reduction.

Most of the existing PC/PBT alloys do not have the functions of noise reduction and noise reduction, thereby limiting the application range of the PC/PBT alloys.

Disclosure of Invention

In order to solve the problems mentioned in the background art, the invention provides a noise-reducing and silencing PC/polyester alloy material, which comprises the following components in parts by weight:

further, the polyester resin is one or more of polybutylene terephthalate resin (PBT), polyethylene terephthalate (PET), 1, 4-cyclohexanedimethanol terephthalate (PCT), polytrimethylene terephthalate (PTT), and 1, 4-cyclohexanedimethanol terephthalate (PETG); polybutylene terephthalate resin PBT is preferred.

Further, the thermoplastic elastomer has a hardness ranging from 40D to 65D.

Furthermore, the antioxidant is a hindered phenol antioxidant serving as a main antioxidant and one or more of phosphite ester, thiol and thiodipropionate.

Further, the lubricant is one or more of pentaerythritol ester, butyl stearate, ethylene bis-stearamide or polyolefin wax.

The invention also provides a preparation method of the noise-reducing and silencing PC/polyester alloy material, which comprises the following specific steps: uniformly mixing polycarbonate resin, polyester resin, thermoplastic elastomer, antioxidant and lubricant, performing melt blending extrusion on a mechanical device, and performing underwater granulation and drying to obtain the PC/polyester alloy material.

Further, the mechanical device may be a twin screw extruder; the processing temperature of the mechanical device is 120-260 ℃, and the rotating speed is 50-600 rpm.

Compared with the prior art, the components of the invention are added with polyester resin, TPEE and the like, so that the components generate a coordination effect, and the PC/polyester alloy material with good solvent resistance and noise reduction is obtained. In addition, the invention also discovers that the TPEE not only has the functions of noise reduction and noise reduction, but also can solve the problem of compatibility among components by adding the TPEE, so that the alloy material can not have the problem of delamination.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the reagents or apparatuses used in the examples are not indicated by the manufacturer, but those not indicated by the specific techniques or conditions described in the literature in the art or by the specifications of the products are all conventional products commercially available.

The raw materials used in the examples and comparative examples are now described below, but are not limited to these materials:

PC resin: kesi wound 2807;

PBT resin: KH2083, corniferatide;

high damping elastomer: dupont Hytrel4056, 6356;

antioxidant: yabao AT-76 and AT-168;

lubricant: dragon sand PETS, clariant E wax.

The raw material formulations of examples 1-3 of the present invention and comparative examples 1-2 are shown in table 1:

TABLE 1

	Comparative example 1	Comparative example 2	Comparative example 3	Example 1	Example 2	Example 3
							PC (Kesi Chuang 2807)	82	74	77	77	34	55
PBT(KH2083)	15	30	15	15	30	20
							TPEE(Hytrel4056)	0	0	1	15	30	0
TPEE(Hytrel6356)	0	0	2	0	0	20
							Antioxidant (AT-76)	0.2	0.2	0.2	0.2	0.2	0.2
Antioxidant (AT-168)	0.3	0.3	0.3	0.3	0.3	0.3
							Lubricant (Longsha PETS)	0.2	0.2	0.2	0.2	0.2	0.2
Lubricant (Kelaien E wax)	0.3	0.3	0.3	0.3	0.3	0.3

The preparation methods of the above examples 1 to 3 and comparative examples 1 to 3 were:

(1) blending raw materials: stirring and mixing the polycarbonate resin, the polyester resin, the thermoplastic elastomer, the antioxidant and the lubricant in a mixer for later use;

(2) and (3) extruding and granulating: adding the mixture into a double-screw extruder, wherein the temperature of each area of the double-screw extruder is controlled as follows: melting, blending and extruding at 220-260 ℃ and the rotating speed of a screw rod of 50-600rpm, and carrying out underwater grain cutting and drying to obtain the PC/PBT alloy material.

The alloy materials obtained in examples 1 to 3 and comparative examples 1 to 3 were also subjected to the following performance tests:

the tensile strength is tested according to ISO 527 standard, and the tensile speed is 50 mm/min;

the bending strength is tested according to ISO 178 standard, and the bending speed is 2 mm/min;

and (3) appearance detection: carrying out macroscopic observation on the section of the alloy material particles;

evaluation of noise: the alloy material is made into a plastic wafer with the diameter of 10cm and the thickness of 6mm, the plastic wafer is placed at the bottom of a test bed, an iron ball with the weight of 1kg is arranged at a position 1m of the vertical height of the wafer, an instrument is started, the falling ball is hit on the wafer, and the noise value is recorded through a decibel instrument.

The results of the performance test are shown in table 2:

TABLE 2

	Comparative example 1	Comparative example 2	Comparative example 3	Example 1	Example 2	Example 3
							Tensile strength (Mpa)	59	56	67	54	48	50
Flexural strength (Mpa)	93	85	99	83	75	79
							Noise (dB)	95	88	92	72	55	63
Appearance detection	Apparent delamination	Apparent delamination	Without delamination	Without delamination	Without delamination	Without delamination

According to the test data in Table 2, compared with comparative examples 1 and 2, the alloy materials of examples 1 to 3 have noise reduction effect, and can reduce the noise to below 72dB, meanwhile, the cross section of the particles of examples 1 to 3 is not layered, the components are uniformly mixed, and the particle diameters of comparative examples 1 and 2 are layered, and the layering is mainly caused by poor compatibility of PC and PBT after analysis; compared with comparative examples 1 and 2, comparative example 3 has no layering phenomenon on the particle size section and has better mechanical properties than comparative examples 1 and 2, because the TPEE is added, so that the compatibility among the components in the molten state of the material is improved, and the TPEE can solve the problem of compatibility among the components; comparative example 3 compared with examples 1 to 3, TPEE was added in a small amount, and thus the noise reduction effect was not significant. In conclusion, the noise reduction and silencing PC/polyester alloy material has good noise reduction effect and good compatibility effect among components.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A noise reduction and silencing PC/polyester alloy material is characterized in that: the composition comprises the following components in parts by weight:

35-65 parts of polycarbonate;

15-40 parts of polyester resin;

15-30 parts of thermoplastic elastomer (TPEE);

0.2-0.5 part of antioxidant;

0.2-0.5 part of lubricant;

the polyester resin is polybutylene terephthalate resin;

the thermoplastic elastomer is Hytrel4056 or Hytrel 6356.

2. The noise reduction and sound attenuation PC/polyester alloy material according to claim 1, wherein: the thermoplastic elastomer has a hardness ranging from 40D to 65D.

3. The noise reduction and sound attenuation PC/polyester alloy material according to claim 1, wherein: the lubricant is one or more of pentaerythritol ester, butyl stearate, ethylene bis stearamide or polyolefin wax.

4. The preparation method of the noise reduction and silencing PC/polyester alloy material as claimed in any one of claims 1 to 3, wherein the method comprises the following steps: uniformly mixing polycarbonate resin, polyester resin, thermoplastic elastomer, antioxidant and lubricant, performing melt blending extrusion on a mechanical device, and performing underwater granulation and drying to obtain the PC/polyester alloy material.

5. The preparation method of the noise reduction and silencing PC/polyester alloy material according to claim 4, wherein the noise reduction and silencing PC/polyester alloy material comprises the following steps: the mechanical device may be a twin screw extruder; the processing temperature of the mechanical device is 120-260 ℃, and the rotating speed is 50-600 rpm.