CN111234527A - Wear-resistant polyetherimide composite material and preparation method thereof - Google Patents

Abstract

The invention discloses a wear-resistant polyetherimide composite material and a preparation method thereof, wherein the material is prepared from the following components in parts by weight: 79-89 parts of polyetherimide, 10-20 parts of wear-resistant material, 0.1-0.3 part of antioxidant and 0.1-0.5 part of lubricant are mixed and extruded to prepare the wear-resistant wear. The wear-resistant material is formed by mixing polytetrafluoroethylene and molybdenum disulfide powder. The invention utilizes the self-lubricating property and high temperature resistance of the polytetrafluoroethylene, the high temperature friction increasing effect of the molybdenum disulfide and the like to improve the wear resistance of the composite material, finally obtains the wear-resistant polyetherimide product with excellent comprehensive performance, and prolongs the service life of the material.

Description

Wear-resistant polyetherimide composite material and preparation method thereof

Technical Field

The invention belongs to the technical field of polymer composite materials, and particularly relates to a wear-resistant polyetherimide composite material and a preparation method thereof.

Technical Field

The Polyetherimide (PEI) amber transparent solid has strong high-temperature stability, and the excellent thermal stability of the PEI amber transparent solid can be used for manufacturing high-temperature heat-resistant devices. The composite material can replace PI and be used for petroleum exploration drilling equipment (high pressure resistance and high strength), high-temperature insulation boards, semiconductor supports, high-speed motor bearings and the like. However, polyetherimides have a relatively low glass transition temperature, generally not exceeding 220 ℃, and relatively poor heat and abrasion resistance.

The Polytetrafluoroethylene (PTFE) with the outstanding self-lubricating property and wider temperature application range is an excellent material for manufacturing products with higher performance requirements, so that the PTFE shows a good development trend in the mechanical field, particularly the tribology field, is engineering plastic widely used at home and abroad, and becomes a hot point for research of various national scholars.

The molybdenum disulfide is solid powder prepared by chemically purifying natural molybdenum concentrate powder and then changing the molecular structure. The product has silver gray black, metallic luster and greasy touch feeling, is insoluble in water, and is an important solid lubricant. The product has the advantages of good dispersibility and no adhesion. In addition, the main functions of the molybdenum disulfide used for the friction material are friction reduction at low temperature and friction increase at high temperature; and the loss on ignition is small and the friction material is volatile.

Disclosure of Invention

The invention aims to expand the application field of PEI, and provides a wear-resistant polyetherimide composite material suitable for industrial batch production and a preparation method thereof.

In order to achieve the purpose, the invention is realized by the following technical scheme:

the wear-resistant polyetherimide composite material is prepared from the following components in parts by weight: 79-89 parts of polyetherimide, 10-20 parts of wear-resistant material, 0.1-0.3 part of antioxidant and 0.1-0.5 part of lubricant; the wear-resistant material is obtained by mixing polytetrafluoroethylene micro powder and nano molybdenum disulfide powder and then carrying out surface treatment by using a coupling agent.

In a further scheme, the mass ratio of the polytetrafluoroethylene micro powder to the nano molybdenum disulfide powder is 2: 1-4: 1; the coupling agent is KH550, and the addition amount of the coupling agent is 2-4 times of the total mass of the polytetrafluoroethylene micro powder and the nano molybdenum disulfide powder.

The polyetherimide has a density of 1.2-1.7 and a tensile strength of greater than 150 MPa.

The antioxidant is at least one of antioxidant 1076, antioxidant 1098 and antioxidant 168.

The lubricant is at least one of A-C540A and Like wax E, PETS.

Another object of the present invention is to provide a method for preparing the above abrasion resistant polyetherimide composite material, comprising the following steps:

(1) mixing polytetrafluoroethylene micro powder and nano molybdenum disulfide powder according to a mass ratio of 2: 1-4: 1, putting the mixture into a high-speed mixer, adding a coupling agent KH560, and blending for 200-280 seconds to obtain the wear-resistant material;

(2) according to the weight parts, the polyetherimide, the wear-resistant material, the antioxidant and the lubricant are added into a high-speed mixer together and mixed evenly; and adding the mixture into an extruder, and finally, performing melt extrusion through the extruder and granulating to obtain the composite material.

In a further scheme, the temperature of the extruder from the feed opening to the die opening is 320 ℃, 340 ℃, 350 ℃ and 355 ℃, the rotating speed of the extruder is 180-.

According to the invention, polytetrafluoroethylene micro powder and nano molybdenum disulfide powder are mixed according to a mass ratio of 2: 1-4: 1, because the polytetrafluoroethylene has low friction coefficient and self-lubricating property, the friction coefficient of the composite material can be greatly reduced by adding the polytetrafluoroethylene. When the composite material generates heat by friction for a long time, and the friction performance of the molybdenum disulfide at high temperature can be effectively improved after the temperature is increased; this is mainly because molybdenum disulfide is a copolymer of molybdenum disulfide, molybdenum trisulfide and molybdenum trioxide at high temperature, and when the temperature of the friction material is sharply increased due to friction, molybdenum trioxide particles in the copolymer expand with the increase in temperature, thereby playing a role in increasing friction.

Detailed Description

The following examples are given to illustrate the present invention and it should be noted that the following examples are only for illustrative purposes and should not be construed as limiting the scope of the present invention, and that the modification and modification of the present invention by those of ordinary skill in the art are not essential to the present invention.

The invention discloses a wear-resistant polyetherimide composite material, which relates to the following material types:

wherein the polyetherimide is ULTEM 1010, ULTEM 1010F, ULTEM 1000R;

the antioxidant is 1098, antioxidant 1010 and antioxidant 168;

the lubricant is A-C540A, EBS, Like wax E, PETS.

The wear-resistant material is prepared by the following method: putting the polytetrafluoroethylene micro powder and the nano molybdenum disulfide powder into a high-speed mixer, adding a coupling agent KH560 accounting for 2-4 times of the total mass of the polytetrafluoroethylene micro powder and the nano molybdenum disulfide powder, and blending for 200-280 seconds to obtain the wear-resistant material. Wherein the proportion of the polytetrafluoroethylene micro powder and the nano molybdenum disulfide powder is 2: 1-4: 1, the frequency is higher, the use ratio of the nano molybdenum disulfide is higher, and the wear-resistant effect of the material is better.

The present invention will be further described with reference to the following examples.

Example 1

Respectively weighing 79 parts of dried ULTEM 1010, 20 parts of wear-resistant material, 0.1 part of antioxidant 1098, 0.1 part of antioxidant 168 and 0.2 part of lubricant PETS according to the weight ratio, mixing, adding into an extruder, extruding by the extruder, cooling by water, and granulating. Wherein the processing temperature of the extruder is 320 ℃, 340 ℃, 350 ℃ and 355 ℃ from the feed opening to the die orifice in sequence, the rotating speed of the main machine is 180rpm, and the vacuum degree is-0.03 MPa.

Example 2

Respectively weighing 89 parts of dried ULTEM 1010F, 10 parts of wear-resistant material, 0.1 part of antioxidant 1010, 0.1 part of antioxidant 168 and 0.5 part of lubricant Like wax E according to the weight ratio, mixing, adding into an extruder, extruding by the extruder, cooling by water, and granulating. Wherein the processing temperature of the extruder is 320 ℃, 340 ℃, 350 ℃ and 355 ℃ from the feed opening to the die orifice in sequence, the rotating speed of the main machine is 200rpm, and the vacuum degree is-0.05 MPa.

Example 3

Weighing 84 parts of dried ULTEM 1000R, 15 parts of wear-resistant material, 0.1 part of antioxidant 1098, 0.2 part of antioxidant 168 and 0.3 part of lubricant A-C540A according to the weight ratio, mixing, adding into an extruder, extruding by the extruder, cooling by water, and granulating. Wherein the processing temperature of the extruder is 320 ℃, 340 ℃, 350 ℃ and 355 ℃ from the feed opening to the die orifice in sequence, the rotating speed of the main machine is 350rpm, and the vacuum degree is-0.05 MPa.

Example 4

Respectively weighing 42 parts of dried ULTEM 1010F, 42 parts of dried ULTEM 1000R, 15 parts of wear-resistant material, 0.1 part of antioxidant 1010, 0.1 part of antioxidant 168 and 0.3 part of lubricant A-C540A according to the weight ratio, mixing, adding into an extruder, extruding by the extruder, cooling by water, and granulating. Wherein the processing temperature of the extruder is 320 ℃, 340 ℃, 350 ℃ and 355 ℃ from the feed opening to the die orifice in sequence, the rotating speed of the main machine is 400rpm, and the vacuum degree is-0.06 MPa.

Comparative example

Respectively weighing 99 parts of dried ULTEM 1000R, 0.1 part of antioxidant 1010, 0.1 part of antioxidant 168 and 0.3 part of lubricant A-C540A according to the weight ratio, mixing, adding into an extruder, extruding by the extruder, cooling by water, and granulating. Wherein the processing temperature of the extruder is 320 ℃, 340 ℃, 350 ℃ and 355 ℃ from the feed opening to the die orifice in sequence, the rotating speed of the main machine is 400rpm, and the vacuum degree is-0.06 MPa.

The test data for the composites prepared in examples 1-4 and comparative examples above are shown in table 1 below:

table 1:

the calculation formula of the volumetric wear rate in table 1 above is:

in the formula, K is the volume wear rate, △ m is the sample mass difference before and after wear, rho is the sample density, N is the load, and L is the sliding friction distance.

As can be seen from the data in the table 1, after different base materials are used and the wear-resistant material compounded in the invention is added, the volume wear rate of the product is obviously reduced, namely the wear resistance of the composite material is improved. Therefore, the invention can meet the requirements of different performances according to the requirements of customers. Different heat conduction requirements of customers can be met, and the heat conduction material is applied to more heat conduction materials.

It should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (7)

1. A wear-resistant polyetherimide composite material is characterized in that: the composition is prepared from the following components in parts by weight: 79-89 parts of polyetherimide, 10-20 parts of wear-resistant material, 0.1-0.3 part of antioxidant and 0.1-0.5 part of lubricant; the wear-resistant material is obtained by mixing polytetrafluoroethylene micro powder and nano molybdenum disulfide powder and then carrying out surface treatment by using a coupling agent.

2. The abrasion resistant polyetherimide composite of claim 1, wherein: the mass ratio of the polytetrafluoroethylene micro powder to the nano molybdenum disulfide powder is 2: 1-4: 1; the coupling agent is KH550, and the addition amount of the coupling agent is 2-4 times of the total mass of the polytetrafluoroethylene micro powder and the nano molybdenum disulfide powder.

3. The abrasion resistant polyetherimide composite of claim 1, wherein: the polyetherimide has a density of 1.2-1.7 and a tensile strength of greater than 150 MPa.

4. The abrasion resistant polyetherimide composite of claim 1, wherein: the antioxidant is at least one of antioxidant 1076, antioxidant 1098 and antioxidant 168.

5. The abrasion resistant polyetherimide composite of claim 1, wherein: the lubricant is at least one of A-C540A and Like wax E, PETS.

6. A method of making the abrasion resistant polyetherimide composite of any one of claims 1 to 5, wherein: the method comprises the following steps:

(1) mixing polytetrafluoroethylene micro powder and nano molybdenum disulfide powder according to a mass ratio of 2: 1-4: 1, putting the mixture into a high-speed mixer, adding a coupling agent KH560, and blending for 200-280 seconds to obtain the wear-resistant material;

(2) according to the weight parts, the polyetherimide, the wear-resistant material, the antioxidant and the lubricant are added into a high-speed mixer together and mixed evenly; and adding the mixture into an extruder, and finally, performing melt extrusion through the extruder and granulating to obtain the composite material.

7. The method of claim 6, wherein: the temperature of the extruder from the feed opening to the die opening is 320 ℃, 340 ℃, 350 ℃, 355 ℃, the rotating speed of the extruder is 180-400rpm, and the vacuum degree is-0.07-0.03 MPa.