Nylon composite material for automobile electric pedal accessories as well as preparation method and application of nylon composite material

Abstract

The invention discloses a nylon composite material for an automobile electric pedal accessory as well as a preparation method and application of the nylon composite material. The nylon composite material is prepared from PPA with an amino functional group, zinc oxide modified PPA, glass fibers, modified nano attapulgite, modified silicon carbide, negative ion powder, polytetrafluoroethylene, calcium stearate and a functional aid. Zinc oxide modified PPA is obtained by modifying PPA through zinc oxide, nano attapulgite is acidified to contain carboxyl functional groups and react with amino functional groups and alcoholic hydroxyl functional groups in PPA, silicon nitride is hydroxylated to contain hydroxyl functional groups and react with benzene rings in PPA, and a net structure is formed through various reactions. The preparation method integrates the advantages of zinc oxide, nano attapulgite, silicon carbide and PPA, replaces aluminum alloy and other metal materials to prepare the automobile electric pedal accessory, is formed through an injection molding method, saves more energy, reduces cost, achieves the purpose that steel is replaced by plastic in the automobile electric pedal accessory, and makes up the market blank.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile electric pedals, and in particular relates to a nylon composite material for automobile electric pedal accessories, a preparation method and an application thereof. Background Art

[0002] The electric foot pedal for cars refers to an electric mechanism that facilitates the driver and passengers to get on and off the car. It can automatically extend or retract according to the driver and passengers opening or closing the door. When the door is opened, the electric foot pedal for cars automatically extends to reduce the stepping distance to facilitate the driver and passengers, similar to the stepping stone used when getting on a horse in ancient times. When the door is closed, the electric foot pedal for cars automatically retracts and is stored under the vehicle chassis or at the skirt without affecting the minimum ground clearance and appearance of the vehicle. The electric foot pedal for cars is suitable for high-chassis models such as commercial vehicles, SUVs, and off-road vehicles.

[0003] At present, most of the components of electric pedals for automobiles on the market, such as bearings and bushings, are made of metal materials such as aluminum alloys and are formed by die-casting and machining. However, they have the disadvantages of high process requirements, large equipment investment, and high cost.

[0004] With the rapid development of the engineering plastics industry, engineering plastics are widely used in electronics, automobiles, construction, office equipment, machinery, aerospace and other industries due to their high rigidity, low creep, good mechanical properties and good heat resistance. With the continuous improvement of engineering plastic modification technology, "plastics replacing steel" and "plastics replacing wood" have become international trends. However, there are very few studies on engineering plastics suitable for automotive electric pedal accessories, and there is a market gap.

[0005] Based on this, the present invention discloses a nylon composite material for automobile electric pedal accessories, a preparation method and an application thereof. Summary of the invention

[0006] In order to solve the technical problems existing in the prior art, the purpose of the present invention is to provide a nylon composite material for automobile electric foot pedal accessories, a preparation method and an application. The nylon composite material can replace metal materials such as aluminum alloys and is formed by injection molding to achieve "plastic replacing steel" in automobile electric foot pedal accessories, thereby filling the market gap.

[0007] In order to achieve the above purpose and the above technical effect, the technical solution adopted by the present invention is:

[0008] A nylon composite material for automobile electric pedal accessories is prepared by using PPA with amino functional groups, PPA modified by zinc oxide, glass fiber, modified nano-attapulgite, modified silicon carbide, negative ion powder, polytetrafluoroethylene, calcium stearate and functional additives.

[0009] Furthermore, the raw materials for preparing the nylon composite material include the following components in parts by weight:

[0010] PPA with amino functional group 20-45 parts

[0011] Zinc oxide modified PPA 20-40 parts

[0012] Glass fiber 10-40 parts

[0013] 20-70 parts of modified nano-attapulgite

[0014] Modified silicon carbide 10-70 parts

[0015] Negative ion powder 1-7 parts

[0016] 2-10 parts of polytetrafluoroethylene

[0017] Calcium stearate 1-10 parts

[0018] Functional additives 1-8 parts.

[0019] Furthermore, the zinc oxide modified PPA is prepared by acidifying zinc oxide with sulfuric acid or hydrochloric acid to obtain zinc oxide with a carboxyl functional group, and the zinc oxide with a carboxyl functional group can react with the amino functional group and the alcoholic hydroxyl functional group in PPA to obtain zinc oxide modified PPA.

[0020] Furthermore, the modified nano-attapulgite is prepared by acidifying the nano-attapulgite with sulfuric acid or hydrochloric acid to obtain nano-attapulgite with carboxyl functional groups, which can react with amino functional groups and alcoholic hydroxyl functional groups in PPA.

[0021] Furthermore, the modified silicon carbide is silicon carbide with hydroxyl functional groups prepared by hydroxylating silicon nitride, and the modified silicon carbide with hydroxyl functional groups can react with the benzene ring in PPA.

[0022] Furthermore, the functional additive is one or a combination of lubricants, anti-yellowing agents, antioxidants, masterbatches, compatibilizers, and dispersants.

[0023] The present invention also discloses a method for preparing a nylon composite material for an automobile electric pedal accessory, comprising the following steps:

[0024] 1) adding 20-45 parts of PPA with amino functional group and 20-40 parts of PPA modified by zinc oxide into a blender by weight and mixing evenly, then adding 20-70 parts of modified nano-attapulgite and mixing evenly, then adding 10-70 parts of modified silicon carbide and mixing evenly, then adding 10-40 parts of glass fiber, 1-7 parts of negative ion powder, 2-10 parts of polytetrafluoroethylene, 1-10 parts of calcium stearate and 1-8 parts of functional additives and mixing evenly to obtain a mixture;

[0025] 2) Extruding and granulating the mixed material to obtain the raw material for preparing the desired nylon composite material;

[0026] 3) The raw material of the nylon composite material obtained in step 2) is molded by injection molding to obtain the desired automobile electric pedal accessories.

[0027] Furthermore, in step 1), the stirring rate of the stirrer is 200-350 r / min, and the stirring time is 20-120 min.

[0028] Furthermore, in step 3), the injection temperature is 280-400°C, the injection pressure is 80-210 MPa, and the mold temperature is 55-155°C.

[0029] The invention also discloses an application of a nylon composite material for an automobile electric pedal accessory in the preparation of an automobile electric pedal accessory. The automobile electric pedal accessory comprises a bearing and a shaft sleeve matched therewith.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The invention discloses a nylon composite material for automobile electric pedal accessories, a preparation method and an application thereof. Zinc oxide can carry a carboxyl functional group after being acidified with sulfuric acid or hydrochloric acid, so that it can react with an amino functional group in PPA to obtain zinc oxide-modified PPA. Nano-attapulgite can carry a carboxyl functional group after being acidified with sulfuric acid or hydrochloric acid, so that it can react with an amino functional group and an alcohol hydroxyl functional group in PPA. Silicon nitride can carry a hydroxyl functional group after being hydroxylated, so that it can react with a benzene ring in PPA. A network structure is formed through the above-mentioned multiple reactions, which integrates the advantages of zinc oxide, nano-attapulgite, silicon carbide and PPA. Glass fiber, polytetrafluoroethylene and calcium stearate are compounded to make the prepared nylon composite material have excellent mechanical properties. The content of negative ions in the air can be increased by adding negative ion powder. The nylon composite material can replace metal materials such as aluminum alloy to prepare automobile electric pedal accessories such as shaft sleeves and bearings. The nylon composite material is formed by injection molding, which is more energy-saving and cost-reducing, and realizes "plastic replacing steel" in automobile electric pedal accessories, thus filling the market gap. DETAILED DESCRIPTION

[0032] The present invention is described in detail below so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0033] A brief summary of one or more aspects is given below to provide a basic understanding of these aspects. This summary is not an exhaustive overview of all conceived aspects, and is neither intended to identify the key or critical elements of all aspects nor to define the scope of any or all aspects. Its only purpose is to give some concepts of one or more aspects in a simplified form as a prelude to a more detailed description that will be given later.

[0034] On the one hand, the present invention discloses a nylon composite material for automobile electric pedal accessories, wherein the nylon composite material is prepared by PPA with amino functional groups, PPA modified by zinc oxide, glass fiber, modified nano-attapulgite, modified silicon carbide, negative ion powder, polytetrafluoroethylene, calcium stearate and functional additives.

[0035] The raw materials for preparing the nylon composite material disclosed in the present invention include the following components in parts by weight:

[0036] PPA with amino functional group 20-45 parts

[0037] Zinc oxide modified PPA 20-40 parts

[0038] Glass fiber 10-40 parts

[0039] 20-70 parts of modified nano-attapulgite

[0040] Modified silicon carbide 10-70 parts

[0041] Negative ion powder 1-7 parts

[0042] 2-10 parts of polytetrafluoroethylene

[0043] Calcium stearate 1-10 parts

[0044] Functional additives 1-8 parts.

[0045] Zinc oxide modified PPA is prepared by acidifying zinc oxide with sulfuric acid or hydrochloric acid to obtain zinc oxide with a carboxyl functional group. The zinc oxide with a carboxyl functional group can react with the amino functional group and the alcoholic hydroxyl functional group in PPA to obtain zinc oxide modified PPA.

[0046] The modified nano-attapulgite is prepared by acidifying the nano-attapulgite with sulfuric acid or hydrochloric acid to obtain nano-attapulgite with carboxyl functional groups, which can react with amino functional groups and alcoholic hydroxyl functional groups in PPA.

[0047] The modified silicon carbide is silicon carbide with a hydroxyl functional group obtained by hydroxylating silicon nitride. The modified silicon carbide with a hydroxyl functional group can react with the benzene ring in PPA.

[0048] The functional additive is one or a combination of lubricants, anti-yellowing agents, antioxidants, masterbatches, compatibilizers, and dispersants.

[0049] On the other hand, the present invention also discloses a method for preparing a nylon composite material for an automobile electric pedal accessory, comprising the following steps:

[0050] 1) adding 20-45 parts of PPA with amino functional group and 20-40 parts of PPA modified by zinc oxide into a blender by weight and mixing evenly, then adding 20-70 parts of modified nano-attapulgite and mixing evenly, then adding 10-70 parts of modified silicon carbide and mixing evenly, then adding 10-40 parts of glass fiber, 1-7 parts of negative ion powder, 2-10 parts of polytetrafluoroethylene, 1-10 parts of calcium stearate and 1-8 parts of functional additives and mixing evenly to obtain a mixture;

[0051] 2) Extruding and granulating the mixed material to obtain the raw material for preparing the desired nylon composite material;

[0052] 3) The raw material of the nylon composite material obtained in step 2) is molded by injection molding to obtain the desired automobile electric pedal accessories.

[0053] In step 1), the stirring rate of the stirrer is 200-350 r / min, and the stirring time is 20-120 min.

[0054] In step 3), the injection temperature is 280-400°C, the injection pressure is 80-210 MPa, and the mold temperature is 55-155°C.

[0055] The invention also discloses an application of a nylon composite material for an automobile electric pedal accessory in the preparation of an automobile electric pedal accessory. The automobile electric pedal accessory comprises a bearing and a matching shaft sleeve and the like.

[0056] The acidification, hydroxylation, reaction of carboxyl group with amino group and alcoholic hydroxyl group, and reaction of hydroxyl group with benzene ring in the present invention are all conventional reactions, so there is no specific limitation on parameters such as process conditions. Those skilled in the art can make flexible and conventional selections based on common knowledge and in combination with actual needs without creative work.

[0057] Example 1

[0058] A nylon composite material for automobile electric pedal accessories is prepared by using PPA with amino functional groups, PPA modified by zinc oxide, glass fiber, modified nano-attapulgite, modified silicon carbide, negative ion powder, polytetrafluoroethylene, calcium stearate and functional additives.

[0059] The raw materials for preparing the nylon composite material include the following components in parts by weight:

[0060] PPA with amino functional group 45 parts

[0061] Zinc oxide modified PPA 20 parts

[0062] Glass fiber 10 parts

[0063] 20 parts of modified nano-attapulgite

[0064] Modified silicon carbide 10 parts

[0065] 1 portion of negative ion powder

[0066] 2 parts of polytetrafluoroethylene

[0067] 1 part calcium stearate

[0068] 1 part of functional additives.

[0069] Zinc oxide modified PPA is prepared by acidifying zinc oxide with sulfuric acid to obtain zinc oxide with a carboxyl functional group. The zinc oxide with a carboxyl functional group can react with the amino functional group and the alcoholic hydroxyl functional group in PPA to obtain zinc oxide modified PPA.

[0070] The modified nano-attapulgite is prepared by acidifying the nano-attapulgite with sulfuric acid to obtain nano-attapulgite with carboxyl functional groups, which can react with amino functional groups and alcoholic hydroxyl functional groups in PPA.

[0071] The modified silicon carbide is silicon carbide with a hydroxyl functional group obtained by hydroxylating silicon nitride. The modified silicon carbide with a hydroxyl functional group can react with the benzene ring in PPA.

[0072] The functional additive is a masterbatch, so that nylon composite materials of different colors can be obtained, so that automobile electric pedal accessories of different colors can be made to meet people's different color needs.

[0073] A method for preparing a nylon composite material for an automobile electric pedal accessory comprises the following steps:

[0074] 1) adding 45 parts of PPA with amino functional group and 20 parts of PPA modified by zinc oxide into a blender by weight and mixing evenly, then adding 20 parts of modified nano-attapulgite and mixing evenly, then adding 10 parts of modified silicon carbide and mixing evenly, then adding 10 parts of glass fiber, 1 part of negative ion powder, 2 parts of polytetrafluoroethylene, 1 part of calcium stearate and 1 part of functional additive and mixing evenly to obtain a mixture;

[0075] 2) Extruding and granulating the mixed material to obtain the raw material for preparing the desired nylon composite material;

[0076] 3) The raw material of the nylon composite material obtained in step 2) is molded by injection molding to obtain the desired automobile electric pedal accessories.

[0077] In step 1), the stirring rate of the stirrer is 300 r / min, and the stirring time is 100 min.

[0078] In step 3), the injection temperature is 340°C, the injection pressure is 150 MPa, and the mold temperature is 145°C.

[0079] This embodiment also discloses the use of a nylon composite material for an automobile electric pedal accessory in preparing a shaft sleeve for an automobile electric pedal accessory.

[0080] Example 2

[0081] A nylon composite material for automobile electric pedal accessories is prepared by using PPA with amino functional groups, PPA modified by zinc oxide, glass fiber, modified nano-attapulgite, modified silicon carbide, negative ion powder, polytetrafluoroethylene, calcium stearate and functional additives.

[0082] The raw materials for preparing the nylon composite material include the following components in parts by weight:

[0083] PPA with amino functional group 35 parts

[0084] Zinc oxide modified PPA 30 parts

[0085] Glass fiber 30 parts

[0086] 70 parts of modified nano-attapulgite

[0087] Modified silicon carbide 70 parts

[0088] 5 portions of negative ion powder

[0089] 8 parts of polytetrafluoroethylene

[0090] 6 parts of calcium stearate

[0091] 3 parts of functional additives.

[0092] Zinc oxide modified PPA is prepared by acidifying zinc oxide with sulfuric acid or hydrochloric acid to obtain zinc oxide with a carboxyl functional group. The zinc oxide with a carboxyl functional group can react with the amino functional group and the alcoholic hydroxyl functional group in PPA to obtain zinc oxide modified PPA.

[0093] The modified nano-attapulgite is prepared by acidifying the nano-attapulgite with sulfuric acid or hydrochloric acid to obtain nano-attapulgite with carboxyl functional groups, which can react with amino functional groups and alcoholic hydroxyl functional groups in PPA.

[0094] The modified silicon carbide is silicon carbide with a hydroxyl functional group obtained by hydroxylating silicon nitride. The modified silicon carbide with a hydroxyl functional group can react with the benzene ring in PPA.

[0095] The functional additive is one or a combination of lubricants, anti-yellowing agents, antioxidants, masterbatches, compatibilizers, and dispersants.

[0096] A method for preparing a nylon composite material for an automobile electric pedal accessory comprises the following steps:

[0097] 1) adding 35 parts of PPA with amino functional group and 30 parts of PPA modified by zinc oxide into a blender by weight and mixing evenly, then adding 70 parts of modified nano-attapulgite and mixing evenly, then adding 70 parts of modified silicon carbide and mixing evenly, then adding 30 parts of glass fiber, 5 parts of negative ion powder, 8 parts of polytetrafluoroethylene, 6 parts of calcium stearate and 3 parts of functional additives and mixing evenly to obtain a mixture;

[0098] 2) Extruding and granulating the mixed material to obtain the raw material for preparing the desired nylon composite material;

[0099] 3) The raw material of the nylon composite material obtained in step 2) is molded by injection molding to obtain the desired automobile electric pedal accessories.

[0100] In step 1), the stirring rate of the stirrer is 250 r / min, and the stirring time is 120 min.

[0101] In step 3), the injection temperature is 330°C, the injection pressure is 180 MPa, and the mold temperature is 85°C.

[0102] This embodiment also discloses the use of a nylon composite material for an automobile electric pedal accessory in preparing a bearing for an automobile electric pedal accessory.

[0103] The rest is the same as in Example 1.

[0104] Comparative Example 1

[0105] The shaft sleeve in the commercially available automobile electric pedal accessories is made of aluminum alloy material and formed by die casting-machining.

[0106] Comparative Example 2

[0107] The bearings in the commercially available automotive electric pedal accessories are made of aluminum alloy and formed by die casting and machining.

[0108] The mechanical properties of the nylon composite material of Example 1-2 were tested, and the test results are shown in Table 1.

[0109] Table 1

[0110] Average scratch width (mm) Notched impact strength retention rate (%) Example 1 0.324 79.5 Example 2 0.321 79.4 Comparative Example 1 0.319 79.6 Comparative Example 2 0.323 79.8

[0111] As can be seen from Table 1, the wear and scratch resistance and impact strength retention rate of the nylon composite materials of Examples 1-2 are not much different from those of the aluminum alloy materials of Comparative Examples 1-2. They can replace existing metal materials such as aluminum alloys and are formed by injection molding, which is more energy-efficient and cost-effective, thus realizing the "plastic replacing steel" in automotive electric pedal accessories and filling the market gap.

[0112] Parts or structures not specifically described in the present invention may adopt existing technologies or existing products and will not be described in detail here.

[0113] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A nylon composite material for automotive electric pedal accessories, characterized in that: The nylon composite material is prepared by using PPA with amino functional groups, PPA modified by zinc oxide, glass fiber, modified nano-attapulgite, modified silicon carbide, negative ion powder, polytetrafluoroethylene, calcium stearate and functional additives.

2. The nylon composite material for automobile electric pedal accessories according to claim 1, characterized in that: The raw materials for preparing the nylon composite material include the following components in parts by weight: PPA with amino functional group 20-45 parts Zinc oxide modified PPA 20-40 parts Glass fiber 10-40 parts 20-70 parts of modified nano-attapulgite Modified silicon carbide 10-70 parts Negative ion powder 1-7 parts 2-10 parts of polytetrafluoroethylene Calcium stearate 1-10 parts Functional additives 1-8 parts.

3. The nylon composite material for automobile electric pedal accessories according to claim 1, characterized in that: The zinc oxide modified PPA is prepared by acidifying zinc oxide with sulfuric acid or hydrochloric acid to obtain zinc oxide with a carboxyl functional group. The zinc oxide with a carboxyl functional group can react with the amino functional group and the alcoholic hydroxyl functional group in PPA to obtain zinc oxide modified PPA.

4. The nylon composite material for automobile electric pedal accessories according to claim 1, characterized in that: The modified nano-attapulgite is prepared by acidifying the nano-attapulgite with sulfuric acid or hydrochloric acid to form nano-attapulgite with carboxyl functional groups, which can react with amino functional groups and alcoholic hydroxyl functional groups in PPA.

5. The nylon composite material for automobile electric pedal accessories according to claim 1, characterized in that: The modified silicon carbide is silicon carbide with hydroxyl functional groups prepared by hydroxylating silicon nitride. The modified silicon carbide with hydroxyl functional groups can react with the benzene ring in PPA.

6. The nylon composite material for automobile electric pedal accessories according to claim 1, characterized in that: The functional additive is one or a combination of lubricants, anti-yellowing agents, antioxidants, masterbatches, compatibilizers, and dispersants.

7. The method for preparing a nylon composite material for automobile electric pedal accessories according to any one of claims 1 to 6, characterized in that: The following steps are involved: 1) adding 20-45 parts of PPA with amino functional group and 20-40 parts of PPA modified by zinc oxide into a blender by weight and mixing evenly, then adding 20-70 parts of modified nano-attapulgite and mixing evenly, then adding 10-70 parts of modified silicon carbide and mixing evenly, then adding 10-40 parts of glass fiber, 1-7 parts of negative ion powder, 2-10 parts of polytetrafluoroethylene, 1-10 parts of calcium stearate and 1-8 parts of functional additives and mixing evenly to obtain a mixture; 2) Extruding and granulating the mixed material to obtain the raw material for preparing the desired nylon composite material; 3) The raw material of the nylon composite material obtained in step 2) is molded by injection molding to obtain the desired automobile electric pedal accessories.

8. The method for preparing a nylon composite material for automobile electric pedal accessories according to claim 7, characterized in that: In step 1), the stirring rate of the stirrer is 200-350 r / min, and the stirring time is 20-120 min.

9. The method for preparing a nylon composite material for automobile electric pedal accessories according to claim 7, characterized in that: In step 3), the injection temperature is 280-400°C, the injection pressure is 80-210 MPa, and the mold temperature is 55-155°C.

10. Use of a nylon composite material for automobile electric pedal accessories according to any one of claims 1 to 6 in the preparation of automobile electric pedal accessories, characterized in that: The automobile electric pedal accessory comprises a bearing and a matching shaft sleeve.