Wear-resistant reinforced nylon material and preparation process thereof

Abstract

The invention discloses a wear-resistant reinforced nylon material and a preparation process thereof. The wear-resistant reinforced nylon material comprises the following components in parts by weight: 80-120 parts of PA resin; 20 to 60 parts of PTFE (Polytetrafluoroethylene) resin; 6 to 30 parts of glass fiber; 0.1-10 parts of an impregnating compound; 0.1-10 parts of a dispersant; and 0.01 to 1 part of an antioxidant. The PA resin, the PTFE resin pre-impregnated and modified by the carbon fiber and the glass fiber are blended and polymerized to complete mutual combination, so that the interface combination effect is good, and the wear-resistant enhancement characteristic of the nylon is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of nylon materials, and in particular relates to a wear-resistant reinforced nylon material and a preparation process thereof. Background Art

[0002] Nylon 66 is a widely used engineering plastic, which is made by polycondensation of hexamethylenediamine and adipic acid. The amide groups on its molecular chain are polar and easy to form hydrogen bonds, so it has excellent mechanical properties, such as high strength, high modulus, high hardness, etc. In addition, it also exhibits excellent creep resistance, wear resistance and noise reduction. However, due to its special structure, its water absorption rate is high, resulting in poor dimensional stability, which also reduces its wear resistance and heat resistance. Nylon 66 can be modified to improve its shortcomings and greatly improve its performance.

[0003] The modification of nylon 66 can be roughly divided into physical modification and chemical modification. Chemical modification is to introduce new polymers, structural units or functional groups into the molecular chain of nylon 66 to change its structure and performance. Physical modification is to add other fillers, such as organic materials, inorganic materials, rubber varieties, thermoplastic elastomers, other plastic varieties, or some additives, into the nylon 66 matrix to produce nylon 66 modified materials with outstanding performance through mixing and kneading.

[0004] In the aspect of nylon 66 reinforcement modification, commonly used fibers such as glass fiber and carbon fiber are mainly added by melt blending. In the reinforced nylon 66 composite material prepared by melt blending, the interface performance between the fiber and the matrix is ​​poor, and if a composite material with good wear resistance is required, fillers such as wear-resistant agents need to be added. Chinese patent CN101182388A discloses a high wear-resistant and high rigidity reinforced nylon 66 composite material prepared by melt blending, in which the amount of glass fiber and wear-resistant agent added is high. On the one hand, the interface force between the glass fiber and the matrix is ​​poor, and on the other hand, the high amount of glass fiber added greatly increases the density of the composite material, making it difficult to use on some lightweight equipment.

[0005] Therefore, further improvement and optimization are needed in wear-resistant reinforced nylon. Summary of the invention

[0006] In view of this, the technical problem to be solved by the present invention is to provide a wear-resistant reinforced nylon material and a preparation process thereof, so as to avoid the problems of poor interface force between matrices and insufficient quality of nylon itself after adding fiber modification in the past.

[0007] In order to solve the above technical problems, the present invention discloses a wear-resistant reinforced nylon material and a preparation process thereof, which comprises, by weight: 80-120 parts of PA resin; PTFE resin 20-60 parts; Glass fiber 6-30 parts; Wetting agent 0.1-10 parts; Dispersant 0.1-10 parts; Antioxidant 0.01-1 part.

[0008] According to one embodiment of the present invention, the invention comprises, by weight: 80 parts of PA resin; PTFE resin 20 parts; 6 parts of glass fiber; Wetting agent 0.1 part; Dispersant 0.1 part; Antioxidant 0.01 parts.

[0009] According to one embodiment of the present invention, the composition comprises, by weight: 120 parts of PA resin; PTFE resin 60 parts; Glass fiber 30 parts; 10 parts of wetting agent; Dispersant 10 parts; 1 part antioxidant.

[0010] According to one embodiment of the present invention, the composition comprises, by weight: PA resin 100 parts; PTFE resin 40 parts; Glass fiber 18 parts; 5 parts of wetting agent; 6 parts of dispersant; 0.5 parts of antioxidant.

[0011] The invention also discloses a preparation process of a wear-resistant reinforced nylon material, comprising: Step a. Weigh the PTFE resin in parts by weight, pre-impregnate it in a carbon fiber and epoxy resin solution, dry it at 60-120°C for 1-5 hours, and then cool it naturally; Step b. Weigh PA resin, glass fiber, sizing agent, dispersant, antioxidant, and pre-impregnated PTFE resin in parts by weight and physically blend them in a high-speed mixer; Step c. Add water to the mixture and put it into a reactor, replace it with nitrogen 3-5 times, and heat to complete the polymerization reaction; Step d. After the polymerization is completed, the material is discharged, cooled and pelletized to obtain reinforced nylon wet chips; Step e. Place the wet slices into an extraction and drying device, extract with boiling water at 100°C for 36 hours, and dry with high-purity nitrogen at 135°C for 36 hours to obtain a wear-resistant reinforced nylon material.

[0012] According to one embodiment of the present invention, in step c, the temperature is first heated to 110-130 degrees, and the water is distilled to 5-10%, thereby completing the primary polymerization; the temperature is then continued to be raised to 220 degrees, and the pressure is maintained at 0.2-1.8 MPa for 2.5 hours to complete the secondary polymerization; finally, the air is slowly released to a pressure of 0.1 MPa, and the temperature is raised to 270 degrees, and the vacuum is drawn to -0.05 MPa, and the pressure is maintained for half an hour to complete the tertiary polymerization.

[0013] Compared with the prior art, the present invention can achieve the following technical effects: By blending and polymerizing PA resin, PTFE resin modified by carbon fiber pre-impregnation, and glass fiber, they are combined with each other, with good interface bonding effect, which improves the wear-resistant reinforcement properties of nylon.

[0014] Of course, any product implementing the present invention does not necessarily need to achieve all of the above-mentioned technical effects at the same time. DETAILED DESCRIPTION

[0015] The following will describe the implementation methods of the present invention in detail with reference to examples, so that the implementation process of how the present invention applies technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0016] The present invention discloses a wear-resistant reinforced nylon material and a preparation process thereof, which comprises, by weight: 80-120 parts of PA resin; PTFE resin 20-60 parts; Glass fiber 6-30 parts; Wetting agent 0.1-10 parts; Dispersant 0.1-10 parts; Antioxidant 0.01-1 part. Example 1

[0017] Step a. Weigh the PTFE resin in parts by weight, pre-impregnate it in a carbon fiber and epoxy resin solution, dry it at 60-120°C for 1-5 hours, and then cool it naturally; Step b weighed 80 parts of PA resin, 6 parts of glass fiber, 0.1 parts of sizing agent, 0.1 parts of dispersant, 0.01 parts of antioxidant, and 20 parts of PTFE resin after pre-preg cooling, and physically blended in a high-speed mixer; Step c. Add water to the mixture and put it into the reactor, replace with nitrogen 3-5 times, and heat to complete the polymerization reaction; first heat to 110-130 degrees, distill water to 5-10%, and complete the first polymerization; then continue to heat to 220 degrees, the pressure is 0.2-1.8MPa, maintain for 2.5 hours, complete the second polymerization; finally slowly release the gas to the pressure of 0.1MPa, and at the same time heat to 270 degrees, vacuum -0.05MPa, maintain for half an hour, and complete the third polymerization; Step d. After the polymerization is completed, the material is discharged, cooled and pelletized to obtain reinforced nylon wet chips; Step e. Place the wet slices into an extraction and drying device, extract with boiling water at 100°C for 36 hours, and dry with high-purity nitrogen at 135°C for 36 hours to obtain a wear-resistant reinforced nylon material. Example 2

[0018] Step a. Weigh the PTFE resin in parts by weight, pre-impregnate it in a carbon fiber and epoxy resin solution, dry it at 60-120°C for 1-5 hours, and then cool it naturally; Step b weighed in parts by weight 120 parts of PA resin, 30 parts of glass fiber, 10 parts of sizing agent, 10 parts of dispersant, 1 part of antioxidant, and 60 parts of PTFE resin after pre-preg cooling, physically blended in a high-speed mixer; Step c. Add water to the mixture and put it into the reactor, replace with nitrogen 3-5 times, and heat to complete the polymerization reaction; first heat to 110-130 degrees, distill water to 5-10%, and complete the first polymerization; then continue to heat to 220 degrees, the pressure is 0.2-1.8MPa, maintain for 2.5 hours, complete the second polymerization; finally slowly release the gas to the pressure of 0.1MPa, and at the same time heat to 270 degrees, vacuum -0.05MPa, maintain for half an hour, and complete the third polymerization; Step d. After the polymerization is completed, the material is discharged, cooled and pelletized to obtain reinforced nylon wet chips; Step e. Place the wet slices into an extraction and drying device, extract with boiling water at 100°C for 36 hours, and dry with high-purity nitrogen at 135°C for 36 hours to obtain a wear-resistant reinforced nylon material. Example 3

[0019] Step a. Weigh the PTFE resin in parts by weight, pre-impregnate it in a carbon fiber and epoxy resin solution, dry it at 60-120°C for 1-5 hours, and then cool it naturally; Step b weighed 100 parts of PA resin, 18 parts of glass fiber, 6 parts of sizing agent, 6 parts of dispersant, 0.5 parts of antioxidant, and 40 parts of PTFE resin after prepreg cooling, and physically blended in a high-speed mixer; Step c. Add water to the mixture and put it into the reactor, replace with nitrogen 3-5 times, and heat to complete the polymerization reaction; first heat to 110-130 degrees, distill water to 5-10%, and complete the first polymerization; then continue to heat to 220 degrees, the pressure is 0.2-1.8MPa, maintain for 2.5 hours, complete the second polymerization; finally slowly release the gas to the pressure of 0.1MPa, and at the same time heat to 270 degrees, vacuum -0.05MPa, maintain for half an hour, and complete the third polymerization; Step d. After the polymerization is completed, the material is discharged, cooled and pelletized to obtain reinforced nylon wet chips; Step e. Place the wet slices into an extraction and drying device, extract with boiling water at 100°C for 36 hours, and dry with high-purity nitrogen at 135°C for 36 hours to obtain a wear-resistant reinforced nylon material.

[0020] By contacting the samples of Examples 1-3 with the abrasive and performing reciprocating motion under the same conditions, the surface wear degree of the samples under the action of friction was tested. It was found that the measured sample of Example 3 had the smallest volume loss under a certain number of frictions and the best wear resistance.

[0021] In summary, the present invention achieves mutual bonding through the blending and polymerization of PA resin, carbon fiber pre-impregnated modified PTFE resin, and glass fiber, and has a good interface bonding effect, thereby improving the wear-resistant and enhanced properties of nylon.

[0022] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A wear-resistant reinforced nylon material, characterized in that: Included by weight: 80-120 parts of PA resin; PTFE resin 20-60 parts; Glass fiber 6-30 parts; Wetting agent 0.1-10 parts; Dispersant 0.1-10 parts; Antioxidant 0.01-1 part.

2. The wear-resistant reinforced nylon material according to claim 1, characterized in that: Included by weight: 80 parts of PA resin; PTFE resin 20 parts; 6 parts of glass fiber; Wetting agent 0.1 part; Dispersant 0.1 part; Antioxidant 0.01 parts.

3. The wear-resistant reinforced nylon material according to claim 1, characterized in that: Included by weight: 120 parts of PA resin; PTFE resin 60 parts; Glass fiber 30 parts; 10 parts of wetting agent; Dispersant 10 parts; 1 part antioxidant.

4. The wear-resistant reinforced nylon material according to claim 1, characterized in that: Included by weight: PA resin 100 parts; PTFE resin 40 parts; Glass fiber 18 parts; 5 parts of wetting agent; 6 parts of dispersant; 0.5 parts of antioxidant.

5. A process for preparing the wear-resistant reinforced nylon material according to claim 1, characterized in that: include: Step a. Weigh the PTFE resin in parts by weight, pre-impregnate it in a carbon fiber and epoxy resin solution, dry it at 60-120°C for 1-5 hours, and then cool it naturally; Step b. Weigh PA resin, glass fiber, sizing agent, dispersant, antioxidant, and pre-impregnated PTFE resin in parts by weight and physically blend them in a high-speed mixer; Step c. Add water to the mixture and put it into a reactor, replace it with nitrogen 3-5 times, and heat to complete the polymerization reaction; Step d. After the polymerization is completed, the material is discharged, cooled and pelletized to obtain reinforced nylon wet chips; Step e. Place the wet slices into an extraction and drying device, extract with boiling water at 100°C for 36 hours, and dry with high-purity nitrogen at 135°C for 36 hours to obtain a wear-resistant reinforced nylon material.

6. The preparation process of the wear-resistant reinforced nylon material according to claim 5, characterized in that: In the step c, the temperature is firstly heated to 110-130 degrees, and the water is distilled to 5-10%, thereby completing the primary polymerization; the temperature is then continued to be raised to 220 degrees, and the pressure is maintained at 0.2-1.8 MPa for 2.5 hours to complete the secondary polymerization; finally, the gas is slowly released to a pressure of 0.1 MPa, and the temperature is simultaneously raised to 270 degrees, and the vacuum is drawn to -0.05 MPa, and maintained for half an hour to complete the tertiary polymerization.