阅读说明：本技术 一种工程塑料轴承保持架专用料及其制备方法 (Special material for engineering plastic bearing retainer and preparation method thereof ) 是由 施俊其 刘云 施晨逸 沈健 陈敏 于 2021-09-07 设计创作，主要内容包括：本申请涉及涉及轴承保持架的技术领域,具体公开了一种工程塑料轴承保持架专用料及其制备方法。工程塑料轴承保持架专用料的制备原料按重量份计,包括尼龙切片50-70份、聚对苯二甲酸乙二醇酯10-20份、树枝状聚酰胺胺3-10份、甲氧基聚乙二醇2-5份、多孔二氧化硅粉末0.5-3份、短切碳纤维12-20份、偶联剂0.03-0.05份；其制备方法为：S1、将尼龙切片、聚对苯二甲酸乙二醇酯、树枝状聚酰胺胺、甲氧基聚乙二醇和偶联剂在220-240℃混炼得混炼料；S2、将混炼料与多孔二氧化硅粉末、短切碳纤维放入双螺杆挤出机中挤出,造粒即得工程塑料轴承保持架专用料。本申请的轴承保持架专用料具有较高的冲击韧性。(The application relates to the technical field of bearing retainers, and particularly discloses a special material for an engineering plastic bearing retainer and a preparation method thereof. The raw materials for preparing the special material for the engineering plastic bearing retainer comprise, by weight, 50-70 parts of nylon slices, 10-20 parts of polyethylene glycol terephthalate, 3-10 parts of dendritic polyamidoamine, 2-5 parts of methoxy polyethylene glycol, 0.5-3 parts of porous silicon dioxide powder, 12-20 parts of chopped carbon fibers and 0.03-0.05 part of coupling agent; the preparation method comprises the following steps: s1, mixing nylon chips, polyethylene glycol terephthalate, dendritic polyamidoamine, methoxy polyethylene glycol and a coupling agent at the temperature of 220-240 ℃ to obtain a mixed material; s2, putting the mixed material, porous silicon dioxide powder and chopped carbon fibers into a double-screw extruder for extrusion, and granulating to obtain the special material for the engineering plastic bearing retainer. The special material for the bearing retainer has high impact toughness.)

1. The special material for the engineering plastic bearing retainer is characterized by comprising, by weight, 50-70 parts of nylon slices, 10-20 parts of polyethylene glycol terephthalate, 3-10 parts of dendritic polyamidoamine, 2-5 parts of methoxy polyethylene glycol, 0.5-3 parts of porous silica powder, 12-20 parts of chopped carbon fibers and 0.03-0.05 part of a coupling agent.

2. The special material for the engineering plastic bearing retainer according to claim 1, wherein the special material comprises the following components in percentage by weight: the weight average molecular weight of the polyethylene terephthalate is 27400-49200.

3. The special material for the engineering plastic bearing retainer according to claim 1, wherein the special material comprises the following components in percentage by weight: the terminal group of the dendritic polyamidoamine is-NH₂。

4. The special material for the engineering plastic bearing retainer according to claim 3, wherein the special material comprises the following components in percentage by weight: the dendritic polyamidoamine is 5 generation dendritic polyamidoamine and/or 4 generation dendritic polyamidoamine.

5. The special material for the engineering plastic bearing retainer according to claim 1, wherein the special material comprises the following components in percentage by weight: the particle size of the porous silica powder is 1.8 to 3 μm.

6. The special material for the engineering plastic bearing retainer according to claim 1, wherein the special material comprises the following components in percentage by weight: the linear density of the chopped carbon fibers is 510-800 g/km.

7. The special material for the engineering plastic bearing retainer according to claim 1, wherein the special material comprises the following components in percentage by weight: the nylon slices are PA66 slices.

8. The special material for the engineering plastic bearing retainer according to claim 7, wherein the special material comprises the following components in percentage by weight: the PA66 slice has a relative viscosity of 3.1-3.3.

9. The preparation method of the special material for the engineering plastic bearing retainer as claimed in claim 1, characterized by comprising the following preparation steps:

s1, mixing nylon chips, polyethylene glycol terephthalate, dendritic polyamidoamine, methoxy polyethylene glycol and a coupling agent at the temperature of 220-240 ℃ to prepare a mixed material;

s2, putting the mixed material, porous silicon dioxide powder and chopped carbon fiber into a double-screw extruder for extrusion and granulation to obtain the special material for the engineering plastic bearing retainer.

Technical Field

The invention relates to the technical field of bearing retainers, in particular to a special material for an engineering plastic bearing retainer and a preparation method thereof.

Background

Engineering plastics can be used as engineering materials to replace metals to manufacture machine parts and the like, have high mechanical properties, and can be used in harsh physical and chemical environments for a long time. The engineering plastics are various in variety and mainly comprise polyamide, polycarbonate, polyformaldehyde, modified polyphenyl ether and the like.

Polyamides in engineering plastics, commonly known as nylons, are widely used due to their high strength, wear resistance and excellent self-lubricity. Nylon is the first synthetic fiber to appear in the world, and the yield of the nylon is the first place in the middle of the common engineering plastics. With the development and use of nylon, the nylon has the disadvantages of high water absorption and low heat distortion temperature, and the application of the nylon is limited. Therefore, inorganic fillers such as glass fiber, carbon fiber and talc are added to nylon to overcome the defect of poor heat resistance of nylon, but the addition of the inorganic fillers causes the reduction of impact toughness of nylon, so that the problem that a bearing retainer made of nylon is easy to break during use is caused, and the use of the bearing retainer is not facilitated.

With respect to the related art in the above, the inventors consider that: it is highly desirable to improve the impact toughness of bearing cages.

Disclosure of Invention

In order to improve the impact toughness of the bearing retainer, the application provides a special material for an engineering plastic bearing retainer and a preparation method thereof.

In a first aspect, the application provides a special material for an engineering plastic bearing retainer, which adopts the following technical scheme: the special material for the engineering plastic bearing retainer comprises, by weight, 50-70 parts of nylon slices, 10-20 parts of polyethylene glycol terephthalate, 3-10 parts of dendritic polyamidoamine, 2-5 parts of methoxy polyethylene glycol, 0.5-3 parts of porous silica powder, 12-20 parts of chopped carbon fibers and 0.03-0.05 part of a coupling agent.

By adopting the technical scheme, the components and the dosage of the raw materials for preparing the bearing retainer are adjusted, the polyethylene glycol terephthalate and the nylon slices are blended, the nylon slices are modified, the methoxypolyethylene glycol in the raw materials is of a three-dimensional structure and can form a cross-linked structure with the dendritic polyamidoamine, the stability of the special material for the bearing retainer is improved, the impact strength of the special material for the bearing retainer is improved, the prepared bearing retainer has higher impact toughness, the porous silicon dioxide powder has higher specific surface area and can complement the gap of the special material for the bearing retainer, the contact area with the rest raw materials is higher, the possibility of micro-crack expansion is reduced, and the wear resistance of the special material for the bearing retainer is further improved.

Preferably, the weight average molecular weight of the polyethylene terephthalate is 27400-49200; more preferably, the weight average molecular weight of the polyethylene terephthalate is 39000.

By adopting the technical scheme, when the weight average molecular weight of the polyethylene glycol terephthalate is 39000, the polyethylene glycol terephthalate is uniformly dispersed in a raw material system for preparing the bearing retainer, and the prepared special material for the bearing retainer has high impact strength and high impact toughness.

Preferably, the terminal group of the dendritic polyamidoamine is-NH₂。

By adopting the technical scheme, the terminal group is-NH₂The material for bearing holders produced from the dendritic polyamidoamine has high impact strength, and the bearing holder produced therefrom has excellent impact toughness, and the applicant speculates that the terminal group is-NH₂The compatibility of the dendritic polyamidoamine in the bearing retainer preparation raw material is higher, the impact strength of the special material for the bearing retainer is higher, and the prepared bearing retainer has higher impact toughness.

Preferably, the dendritic polyamidoamine is a 5-generation dendritic polyamidoamine and/or a 4-generation dendritic polyamidoamine.

By adopting the technical scheme, when the dendritic polyamidoamine is 5-generation dendritic polyamidoamine and/or 4-generation dendritic polyamidoamine, the prepared special material for the bearing retainer has higher impact strength.

Preferably, the porous silica powder has a particle size of 1.8 to 3 μm.

By adopting the technical scheme, the porous silicon dioxide with the grain diameter of 1.8-3 mu m is uniformly dispersed in the preparation system of the special material for the bearing retainer, so that the wear resistance of the special material for the bearing retainer is further improved.

Preferably, the linear density of the chopped carbon fibers is 510-800 g/km; more preferably, the chopped carbon fibers have a linear density of 728 g/km.

By adopting the technical scheme, the chopped carbon fibers with the linear density of 728g/km have higher compatibility in the preparation system of the special material for the bearing retainer, and the impact strength of the special material for the bearing retainer can be improved in an auxiliary manner.

Preferably, the nylon chips are PA66 chips.

Preferably, the PA66 chip has a relative viscosity of 3.1-3.3.

By adopting the technical scheme, when the nylon chips with the relative viscosity of 3.1-3.3 are taken as raw materials, the prepared special material for the bearing retainer has high impact strength and high impact toughness.

In a second aspect, the application provides a preparation method of a special material for an engineering plastic bearing retainer, which adopts the following technical scheme:

a preparation method of a special material for an engineering plastic bearing retainer comprises the following preparation steps:

s1, mixing nylon chips, polyethylene glycol terephthalate, dendritic polyamidoamine, methoxy polyethylene glycol and a coupling agent at the temperature of 220-240 ℃ to prepare a mixed material;

s2, putting the mixed material, porous silicon dioxide powder and chopped carbon fiber into a double-screw extruder for extrusion and granulation to obtain the special material for the engineering plastic bearing retainer.

By adopting the technical scheme, the components and the using amount of the raw materials for preparing the bearing retainer are adjusted, the impact toughness of the prepared special material for the bearing retainer is improved by adding polyethylene glycol terephthalate and methoxypolyethylene glycol, and the wear resistance of the special material for the bearing retainer is further improved by adding porous silicon dioxide powder.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the components and the using amount of the raw materials for preparing the bearing retainer are adjusted, the impact toughness of the prepared special material for the bearing retainer is improved by adding polyethylene glycol terephthalate and methoxypolyethylene glycol, and the wear resistance of the special material for the bearing retainer is improved by adding porous silicon dioxide powder;

2. the polyethylene glycol terephthalate with the weight-average molecular weight of 39000 is preferably adopted, the polyethylene glycol terephthalate is uniformly dispersed in a raw material system for preparing the bearing retainer, and the prepared special material for the bearing retainer has high impact strength and high impact toughness;

3. preference is given to using terminal groups of-NH₂The special material for the bearing retainer prepared from the dendritic polyamidoamine has higher impact strength, and the prepared bearing retainer has higher impact toughness.

Detailed Description

The present application will be described in further detail with reference to the following examples, wherein the sources of the raw materials used in the present application are shown in Table 1 unless otherwise specified.

TABLE 1 sources of raw materials used in the present application

Examples

Example 1

A preparation method of a special material for an engineering plastic bearing retainer comprises the following preparation steps:

s1, mixing 60g of nylon chips, 15g of polyethylene terephthalate, 6g of dendritic polyamidoamine, 3g of methoxy polyethylene glycol and 0.04g of coupling agent at 230 ℃ for 30min to prepare a mixed material;

s2, putting the mixed material, 2g of porous silicon dioxide powder and 17g of chopped carbon fiber into a double-screw extruder for extrusion and granulation to obtain the special material for the engineering plastic bearing retainer, wherein the rotating speed of the extruder is 300r/min, and the extrusion temperature is 300 ℃;

the nylon slice is PA6 slice with model number J2400; the weight average molecular weight of the polyethylene terephthalate used is 27400; the dendritic polyamidoamine is 1 generation dendritic polyamidoamine, the terminal group is-OH, and the type is CYD-110H; the particle size of the porous silicon dioxide powder is 3.5-4.5 μm; the linear density of the chopped carbon fibers is 510 g/km; the coupling agent is KH550 coupling agent.

Examples 2 to 7

Examples 2 to 7 are based on example 1 and differ from example 1 only in that: the preparation conditions of the special material for the bearing retainer are different, and are specifically shown in table 2.

TABLE 2 preparation conditions of the materials for bearing retainers in examples 1 to 7

Example 8

Example 8 is based on example 1 and differs from example 1 only in that: the polyethylene terephthalate used had a weight average molecular weight of 49200.

Example 9

Example 9 is based on example 1 and differs from example 1 only in that: the weight average molecular weight of the polyethylene terephthalate used was 39000.

Example 10

Example 10 is based on example 9 and differs from example 9 only in that: the dendritic polyamidoamine is 1 generation dendritic polyamidoamine, and the terminal group is-NH₂The model is CYD-110A.

Example 11

Example 11 is based on example 10 and differs from example 10 only in that: the dendritic polyamidoamine is 4-generation dendritic polyamidoamine, and the terminal group is-NH₂The model is CYD-140A.

Example 12

Example 12 is based on example 10 and differs from example 10 only in that: the dendritic polyamidoamine is 5-generation dendritic polyamidoamine, and the terminal group is-NH₂The model is CYD-150A.

Example 13

Example 13 is based on example 12 and differs from example 12 only in that: the particle size of the silicon dioxide powder used is 1.8-3 μm.

Example 14

Example 14 is based on example 13 and differs from example 13 only in that: the linear density of the chopped carbon fibers used was 800 g/km.

Example 15

Example 15 is based on example 14 and differs from example 14 only in that: the linear density of the chopped carbon fibers used was 728 g/km.

Example 16

Example 16 is based on example 15 and differs from example 15 only in that: the nylon chips are PA66 chips, and the relative viscosity of the PA66 chips is 2.4-2.5.

Example 17

Example 17 is based on example 16 and differs from example 16 only in that: the PA66 chips used had a relative viscosity of 2.62 to 2.72.

Example 18

Example 18 is based on example 16 and differs from example 16 only in that: the PA66 chips used had a relative viscosity of 3.1 to 3.3.

Comparative example

Comparative example 1

Comparative example 1 is based on example 1 and differs from example 1 only in that: equal quality PA66 chips were used instead of polyethylene terephthalate.

Comparative example 2

Comparative example 2 is based on example 1 and differs from example 1 only in that: equal mass of PA66 slices were substituted for methoxypolyethylene glycol.

Comparative example 3

Comparative example 3 is based on example 1 and differs from example 1 only in that: the porous silica powder was replaced by equal mass of PA66 chips.

Comparative example 4

The special material for the bearing retainer comprises the following preparation steps: putting 50g of PA66 slices, 30g of PA6 slices, 0.4g of silicone powder, 0.03g of KH550 coupling agent, 0.005g of antioxidant and 0.01g of heat stabilizer into a high-speed mixer, mixing for 5min to obtain a mixture, putting 19.555g of glass fiber and the mixture into a double-screw extruder, and extruding and granulating to obtain the special material for the bearing retainer, wherein the extrusion temperature is 280 ℃, and the rotating speed of the extruder is 300 r/min;

the PA66 slice used had a relative viscosity of 3.1-3.3 and a type of EPR 32; the PA6 slice used was type J2400; the type of the used silicone powder is BZ-SP 006; the antioxidant is antioxidant 1010; the heat stabilizer is calcium stearate.

Performance test

The following performance tests were carried out on the materials for bearing retainers produced in examples 1 to 18 and comparative examples 1 to 4, respectively.

And (3) impact toughness testing: the notched Izod impact strengths of the materials for bearing retainers obtained in examples 1 to 18 and comparative examples 1 to 4 were measured in accordance with ASTM D256-1997 (Standard test method for Izod impact testing of plastics), and the results are shown in Table 3.

And (3) wear resistance test: the abrasion loss of the special material for the bearing retainer prepared in the examples 1 to 18 and the comparative examples 1 to 4 was measured according to the regulations of GB/T3960-2016 (Plastic sliding frictional abrasion test method), and the test results are shown in Table 3.

TABLE 3 test results of examples 1-18 and comparative examples 1-4

Analysis of the above data shows that the material for the bearing retainer prepared by the present invention has a small amount of wear after being worn, and the cantilever beam of the drawn material for the retainer has a high impact strength, and the bearing retainer prepared by using the material for the bearing retainer has a high impact toughness, and analysis of the data of examples 1 to 7 shows that example 1 is a preferred example of examples 1 to 7.

Analyzing the data of the example 1 and the comparative examples 1-2 in the table 3, it can be seen that when polyethylene terephthalate or methoxypolyethylene glycol is not added during the preparation of the material special for the bearing holder, the cantilever beam impact strength of the prepared material special for the bearing holder is obviously reduced, the application adjusts the components and the use amount of the raw materials for the preparation of the bearing holder, and the polyethylene terephthalate and the nylon chips are blended, so that the nylon chips are modified, the methoxypolyethylene glycol in the raw materials for the preparation is of a three-dimensional structure and can form a cross-linked structure with dendritic polyamidoamine, so that the stability of the material special for the bearing holder is improved, the cantilever beam impact strength of the material special for the bearing holder is improved, and the prepared bearing holder has higher impact toughness. As can be seen from the analysis of the data in example 1 and comparative example 3 in table 3, when the porous silica powder is added to the material special for the bearing holder, the prepared material special for the bearing holder has high wear resistance, the porous silica powder has a high specific surface area, can make up for the gap between the material special for the bearing holder, has a high contact area with the rest of the raw materials, reduces the possibility of micro crack propagation, and further improves the wear resistance of the material special for the bearing holder.

Analysis of the data in examples 8 to 9 and example 1 in table 3 shows that when the weight average molecular weight of the material for preparing the bearing holder is 39000, the prepared material for the bearing holder has high izod impact strength and high impact toughness, and the applicant believes that the reason is probably that the polyethylene terephthalate with the weight average molecular weight of 39000 is uniformly dispersed in the raw material system for preparing the bearing holder, and the prepared material for the bearing holder has high izod impact strength and high impact toughness.

Analysis of the data in Table 3 for examples 10 and 9 revealed that the terminal group was-NH₂The special material for the bearing retainer prepared from the dendritic polyamidoamine has higher cantilever beam impact strength, and the prepared bearing retainer has excellent impact toughness. The Applicant speculates that this is because the terminal group is-NH₂The compatibility of the dendritic polyamidoamine in the bearing retainer preparation raw material is higher, the impact strength of the special material for the bearing retainer is higher, and the prepared bearing retainer has higher impact toughness.

Analysis of the data in examples 11 to 12 and example 10 in table 3 shows that when the dendritic polyamidoamine is 5-generation dendritic polyamidoamine and/or 4-generation dendritic polyamidoamine, the prepared material for the bearing holder has high cantilever beam impact strength, and the prepared bearing holder has high impact toughness.

As is apparent from an analysis of the data of examples 13 and 12 in Table 3, the cantilever impact strength of the material for bearing cage obtained was hardly changed when the particle size of the silica powder was 1.8 to 3 μm, but the wear resistance was improved because the porous silica having a particle size of 1.8 to 3 μm was uniformly dispersed in the system for preparing the material for bearing cage, and the wear resistance of the material for bearing cage was further improved.

Analysis of the data in examples 14 to 15 in table 3 shows that the material for bearing retainers prepared by using the chopped carbon fibers having the linear density of 728g/km has higher cantilever beam impact strength and higher impact toughness, which is probably because the chopped carbon fibers having the linear density of 728g/km have higher compatibility in the preparation system of the material for bearing retainers, and can help improve the impact toughness of the material for bearing retainers.

Analyzing the data of the example 18, the examples 16 to 17 and the example 15 in table 3, it can be seen that when the nylon chip with the relative viscosity of 3.1 to 3.3 is used as the raw material to prepare the special material for the bearing retainer, the prepared special material for the bearing retainer has high cantilever beam impact strength and high impact toughness.

The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.