Polypropylene composite particles and preparation method and application thereof

Abstract

The present invention discloses a polypropylene composite particle and a preparation method and application thereof. The polypropylene composite particle of the present invention is composed of polypropylene, high-density polyethylene, ethylene-octene polymer elastomer, flame retardant, silicone resin microspheres, and polytetrafluoroethylene. The polypropylene composite particle prepared by the present invention is used to prepare a partition for a car seat and / or a cushion. The prepared partition has a low friction coefficient. The partition material prepared by the composite is used between a sponge and a non-woven fabric, which solves the problem of friction noise generated during the use of the original partition material and improves the comfort of the seat and cushion.

Description

Technical Field

[0001] The invention relates to the field of polymer material processing, and in particular to polypropylene composite particles and a preparation method and application thereof. Background Art

[0002] There are many varieties of car interior parts. At present, car seats, including seat cushions and backrests, are usually filled with non-woven bags with elastic materials such as sponges, and a partition made of polypropylene material is used between the sponge and the non-woven bag. On the one hand, it plays a further reinforcement role, and on the other hand, it makes the connection between the sponge and the non-woven bag smoother. However, during the riding experience, users often feel that the seat cushions and backrests have strange noises, which affects the riding experience. The main reason may be the friction noise caused by the large friction coefficient between the polypropylene material and the non-woven fabric.

[0003] Chinese patent CN102492221A discloses a hollow glass microbead-filled low-density polypropylene composite and its preparation method, which can be used for automotive interior parts such as center consoles, door panels, and glove boxes. The patent solves the problem of lightweight automotive interior parts, but does not involve the friction properties of polypropylene materials.

[0004] There is not much information available about the friction properties of polypropylene and how to reduce the noise caused by friction. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a polypropylene composite particle and a preparation method and application thereof. The polypropylene composite particle prepared by the present invention is used to prepare a partition for a car seat and / or a cushion, and the prepared partition has a low friction coefficient. The partition material prepared by the composite is used between a sponge and a non-woven fabric, which solves the problem of friction noise generated during the use of the original partition material and improves the comfort of the seat and cushion.

[0006] One object of the present invention is to provide a polypropylene composite particle, comprising the following raw materials in parts by weight: 100 parts of polypropylene, 50-70 parts of high-density polyethylene, 5-8 parts of ethylene-octene polymer elastomer, 8-10 parts of flame retardant, 1.8-4.5 parts of silicone resin microspheres, and 1.5-6.5 parts of polytetrafluoroethylene.

[0007] Furthermore, the polypropylene is homopolymer polypropylene.

[0008] Furthermore, the polypropylene is obtained by mixing F401 of Yangzi Petrochemical and CM01 of Tianjin Petrochemical, and the weight ratio of the polypropylene of model F401 to the polypropylene of model CM01 is 1:1-1:3.

[0009] Furthermore, the high-density polyethylene is LG Chemical ME5000; the ethylene-octene polymer elastomer is Dow 8150.

[0010] Furthermore, the flame retardant is octabromobisphenol S ether; the average particle size of the silicone resin microspheres is 1.0-2.5 μm; preferably, the silicone resin microspheres are Changxing DF10A0.

[0011] Furthermore, the average particle size of the polytetrafluoroethylene is 10-12 μm; preferably, the polytetrafluoroethylene is purchased from Nanjing Tianshi, with a model number of PTFE-0143.

[0012] A method for preparing the polypropylene composite particles comprises the following steps:

[0013] S1: According to weight proportions, polypropylene, high-density polyethylene, ethylene-octene polymer elastomer, flame retardant, silicone resin microspheres, and polytetrafluoroethylene are stirred and mixed uniformly;

[0014] S2: melt blending, extrusion and granulation by a twin-screw extruder to obtain polypropylene composite particles;

[0015] Furthermore, in step S1, the stirring speed is 150-250 r / min, and the time is 20-26 min.

[0016] Furthermore, in step S2, the temperature of the twin-screw extrusion is 160-220°C, wherein the melt plasticization temperature is 200°C.

[0017] Another object of the present invention is to provide a separator prepared using the above polypropylene composite particles.

[0018] Furthermore, the partition is used for automobile seats and / or cushions; the partition is arranged between the sponge and the non-woven fabric.

[0019] Furthermore, the friction coefficient of the partition on the non-woven fabric is small, and when the partition is in contact with the non-woven fabric for use in a car seat cushion or backrest, the friction noise is small.

[0020] Another object of the present invention is to provide a method for preparing the above-mentioned partition, which comprises placing the polypropylene composite particles in a single-screw machine for melting and plasticizing, extruding a sheet, vacuum forming, and cooling to shape; the thickness of the sheet is 0.1-1.0 mm.

[0021] The invention uses polypropylene as the main raw material, especially uses CM01 polypropylene and F401 polypropylene together, and gives full play to the technical characteristics that CM01 polypropylene is more suitable for negative pressure blister process.

[0022] Furthermore, the present invention adopts the combination of polypropylene and high-density polyethylene to ensure the mechanical properties of the polypropylene composite particles and the polypropylene separators made therefrom.

[0023] Furthermore, the polytetrafluoroethylene added in the present invention is a synthetic polymer material in which all hydrogen atoms in polyethylene are replaced by fluorine atoms. In addition to having excellent chemical stability, corrosion resistance, and high lubricity, the friction coefficient on various solid surfaces is low, but relatively speaking, the wear performance of polytetrafluoroethylene is not good enough, and the silicone resin microsphere is an ultrafine powder with a three-dimensional network structure, which has excellent lubricity and wear resistance, but relatively speaking, the mechanical properties of the silicone resin microsphere are not high. Therefore, the present invention improves the toughness of polypropylene particles by adding an ethylene-octene polymer elastomer with good compatibility with polyolefins and good fluidity, and also effectively solves the problem of co-dispersion of polytetrafluoroethylene and silicone resin microspheres in polypropylene.

[0024] The beneficial technical effects of the present invention are:

[0025] Aiming at the defect that the automobile seat cushion currently made of polypropylene material has abnormal noise, the present invention adds polytetrafluoroethylene and silicone resin microspheres into the polypropylene material, and improves the hydrophobicity of the polypropylene material while ensuring the mechanical properties of the polypropylene material through the synergistic effect of the polytetrafluoroethylene and the silicone resin microspheres in the polypropylene material, thereby reducing the friction coefficient between the polypropylene composite and the non-woven fabric, and eliminating the abnormal noise problem of the automobile seat cushion.

[0026] The present invention optimizes the polypropylene raw material and simultaneously coordinates the optimized polypropylene with high-density polyethylene, polytetrafluoroethylene, silicone resin and ethylene-octene polymer elastomer to ensure the wear resistance and mechanical properties of the partition while reducing the friction coefficient, thus overcoming the discomfort caused by abnormal noise generated by the excessively large friction coefficient of traditional partitions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a contact angle photograph of Example 1 of the present invention.

[0028] Figure 2 This is a contact angle photograph of Comparative Example 1 of the present invention. DETAILED DESCRIPTION

[0029] The present invention is described in detail below in conjunction with the accompanying drawings and embodiments.

[0030] The invention provides a polypropylene composite particle, which comprises the following raw materials in parts by weight: 100 parts of polypropylene, 50-70 parts of high-density polyethylene, 5-8 parts of ethylene-octene polymer elastomer, 8-10 parts of flame retardant, 1.8-4.5 parts of organic silicon resin microspheres and 1.5-6.5 parts of polytetrafluoroethylene.

[0031] In one embodiment of the present invention, the polypropylene is homopolymer polypropylene, which is obtained by mixing F401 of Yangzi Petrochemical and CM01 of Tianjin Petrochemical, and the weight ratio of the polypropylene of model F401 to the polypropylene of model CM01 is 1:1, 1:2, 2:3, 3:7, 7:13 or 1:3.

[0032] In one embodiment of the present invention, the high-density polyethylene is LG Chemical ME5000; the ethylene-octene polymer elastomer is Dow 8150.

[0033] In one embodiment of the present invention, the flame retardant is octabromobisphenol S ether; and the average particle size of the silicone resin microspheres is 1.0-2.5 μm.

[0034] In one embodiment of the present invention, the silicone resin microspheres are preferably Changxing DF10A0.

[0035] In one embodiment of the present invention, the average particle size of the polytetrafluoroethylene is 10-12 μm.

[0036] In one embodiment of the present invention, the polytetrafluoroethylene is purchased from Nanjing Tianshi, and the model number is PTFE-0143.

[0037] A method for preparing the polypropylene composite particles comprises the following steps:

[0038] S1: According to weight proportions, polypropylene, high-density polyethylene, ethylene-octene polymer elastomer, flame retardant, silicone resin microspheres, and polytetrafluoroethylene are stirred and mixed uniformly;

[0039] S2: melt blending, extrusion and granulation by a twin-screw extruder to obtain polypropylene composite particles;

[0040] In one embodiment of the present invention, in step S1, the stirring speed is 150r / min, 175r / min, 180r / min, 200r / min, 220r / min or 250r / min, and the time is 20min, 21min, 22min, 25min or 26min.

[0041] In one embodiment of the present invention, in step S2, the twin-screw extruder temperature range is 160-220°C, wherein the melt plasticization temperature is 200°C, and the sheet thickness is 0.1-1.0 mm.

[0042] The present invention also provides a separator prepared by using the polypropylene composite particles. The separator can be used for automobile seats and / or cushions and is arranged between the sponge and the non-woven fabric.

[0043] The friction coefficient of the partition plate on the non-woven fabric is small, and when the partition plate is in contact with the non-woven fabric and is used for a car seat cushion or backrest, the friction noise is small.

[0044] The present invention also provides a method for preparing the partition, which comprises placing the polypropylene composite particles in a single screw machine for melting and plasticizing, extruding sheets, vacuum forming, and cooling to shape.

[0045] The present invention will be further described below by way of examples.

[0046] The raw materials used in the present invention are: polypropylene is homopolypropylene (homo PP), and the homo PP is F401 of Yangzi Petrochemical and CM01 of Tianjin Petrochemical; high-density polyethylene is LG Chemical ME5000; ethylene-octene polymer elastomer is Dow 8150; flame retardant is octabromobisphenol S ether; silicone resin microspheres are Changxing DF10A0; the average particle size of polytetrafluoroethylene (PTFE) is 10-12μm, purchased from Nanjing Tianshi PTFE-0143.

[0047] Example 1

[0048] A polypropylene composite particle comprises the following raw materials in parts by weight (each part is 1 kg): 100 parts of polypropylene, including 50 parts of F401, 50 parts of CN01, 50 parts of high-density polyethylene (DHPE), 6 parts of ethylene-octene polymer elastomer, 10 parts of flame retardant, 3.0 parts of silicone resin microspheres, and 5.0 parts of polytetrafluoroethylene.

[0049] A method for preparing the polypropylene composite particles comprises the following steps:

[0050] S1: Place polypropylene, high-density polyethylene, ethylene-octene polymer elastomer, flame retardant, silicone resin microspheres, and polytetrafluoroethylene in a high-speed mixer according to weight proportions, and stir at 150 r / min for 20 min to mix evenly;

[0051] S2: melt blending, extrusion and granulation are performed by a twin-screw extruder to obtain polypropylene composite particles; the temperature range of the twin-screw extrusion is 160-220° C., wherein the melt plasticization temperature is 200° C.

[0052] A polypropylene separator prepared by using the polypropylene composite particles, the preparation method of which comprises the following steps;

[0053] The polypropylene composite particles prepared above are placed in a single screw machine for melting and plasticization, extruding a sheet, vacuum forming, cooling and shaping, and then a polypropylene separator is obtained, wherein the sheet thickness is 0.1-1.0 mm.

[0054] Embodiment 2-5

[0055] A polypropylene composite particle comprises raw materials in parts by weight (each part is 1 kg) as shown in Table 1. The preparation methods of the polypropylene composite particles in Examples 2-5 and the method of preparing a polypropylene separator using the polypropylene composite particles are the same as those in Example 1.

[0056] The material compositions and weight proportions of Examples 1-5 and Comparative Examples 1-4 of the present invention are shown in Table 1.

[0057] Table 1 Raw material composition of the embodiments and comparative examples

[0058]

[0059] Example 6

[0060] A polypropylene composite particle, whose raw materials and content are the same as those in Example 1. The preparation method of the polypropylene composite particle is the same as that in Example 1, except that in step S1, the stirring speed is 250r / min and the time is 26min. The method of preparing a polypropylene separator using the polypropylene composite particle is the same as that in Example 1.

[0061] Example 7

[0062] A polypropylene composite particle, whose raw materials and content are the same as those in Example 1. The preparation method of the polypropylene composite particle is the same as that in Example 1, except that in step S1, the stirring speed is 200r / min and the time is 22min. The method of preparing a polypropylene separator using the polypropylene composite particle is the same as that in Example 1.

[0063] Comparative Examples 1-4

[0064] A polypropylene composite particle, the raw materials and content of which are shown in Table 1. The preparation method of the polypropylene composite particle and the method of preparing a polypropylene separator using the polypropylene composite particle are the same as those in Example 1.

[0065] Test example:

[0066] The separators prepared in the embodiments and comparative examples were tested for tensile strength and elongation at break of the composite materials according to the standard GB / T 1040.3-2006. The tensile rate was 50 mm / min, the sample thickness was 2 mm, and each sample was measured 5 times to obtain the average value. The tensile strength of each embodiment and comparative example was 26.0-27.5 MPa, and the elongation at break was 200-350%. There was no significant change in the elongation strength and elongation at break of each embodiment and comparative example, indicating that the polytetrafluoroethylene and silicone resin microspheres added in the present invention had little effect on the mechanical properties of the polypropylene composite material.

[0067] Contact angle test method of each embodiment and comparative example: At room temperature, an optical water contact angle measuring instrument was used to test the water contact angle of the separators prepared in the embodiments and comparative examples by using the sessile drop method. The contact angle result was the average of 5 different results on each sample surface.

[0068] The friction coefficient testing method of each embodiment and comparative example is as follows: a certain weight is loaded on a non-woven fabric and placed on the partition prepared in the embodiment and comparative example, a nylon rope is pulled on the non-woven fabric through a pulley, and the tension is measured with a universal testing machine. The ratio of the tension to the load weight on the non-woven fabric is the friction coefficient.

[0069] The test results of the contact angle and friction coefficient of each embodiment and comparative example are shown in Table 2.

[0070] Table 2 Performance tests of embodiments and comparative examples

[0071]

[0072]

[0073] It can be seen from the test data in Table 2 that the contact angle of each embodiment is significantly increased compared with the comparative example ( Figure 1 This is a contact angle photograph of an embodiment. Figure 2 It is the contact angle photo of comparative example 1), and the friction coefficient is significantly reduced. The main reason is that both polytetrafluoroethylene and silicone resin microspheres are hydrophobic substances. After adding polytetrafluoroethylene and silicone resin microspheres to polymer materials such as PP and HDPE, the hydrophobicity of the polymer materials is enhanced, which is manifested as the contact angle increased from less than 90° to greater than 90°. The improvement of hydrophobicity will produce a part of "papillae" on the surface of the material. When it comes into contact with the non-woven fabric, the contact area is reduced accordingly, which leads to a reduction in the friction coefficient. It can be seen from the data of each embodiment that as the contact angle increases, the corresponding friction coefficient decreases. It can also be seen from the comparative examples that whether only PTFE or only silicone resin microspheres are added, the friction coefficient only decreases to a limited extent, which is not enough to meet the technical requirements of the present invention, indicating that PTFE and silicone resin microspheres still have a certain synergistic effect. It can also be seen from comparative example 5 that when PTFE and silicone resin microspheres do not reach a certain amount, the synergistic effect produced is not very obvious and fails to meet the technical requirements of the present invention.

[0074] The test results in Table 2 show that the polypropylene composite particles of the present invention and the partition for automobile seat cushions made therefrom have a small friction coefficient with the non-woven fabric while maintaining basic mechanical properties, eliminating abnormal noise on the back of the passenger, thereby bringing the passenger a better riding experience.

[0075] The above is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments. It is understood that other improvements and changes directly derived or associated by those skilled in the art without departing from the spirit and concept of the present invention should be considered to be included in the protection scope of the present invention.

Claims

1. A polypropylene composite particle, characterized in that: The polypropylene composite particles include the following raw materials in parts by weight: 100 parts of polypropylene, 50-70 parts of high-density polyethylene, 5-8 parts of ethylene-octene polymer elastomer, 8-10 parts of flame retardant, 2.5-4.5 parts of silicone resin microspheres, and 4.5-6.5 parts of polytetrafluoroethylene; The polypropylene is obtained by mixing F401 of Yangzi Petrochemical and CM01 of Tianjin Petrochemical, and the weight ratio of the polypropylene of model F401 to the polypropylene of model CM01 is 1:1-1:3; The average particle size of the silicone resin microspheres is 1.0-2.5 μm; The average particle size of the polytetrafluoroethylene is 10-12µm; The polypropylene composite particles are used to prepare a partition for a car seat and / or a cushion; the partition is arranged between the sponge and the non-woven fabric.

2. The polypropylene composite particles according to claim 1, characterized in that The high-density polyethylene is LG Chemical ME5000; the ethylene-octene polymer elastomer is Dow 8150.

3. The polypropylene composite particles according to claim 1, characterized in that The flame retardant is octabromobisphenol S ether; the silicone resin microspheres are Changxing DF10A0.

4. The polypropylene composite particles according to claim 1, characterized in that The polytetrafluoroethylene was purchased from Nanjing Tianshi, model number PTFE-0143.

5. A method for preparing the polypropylene composite particles according to any one of claims 1 to 4, characterized in that: The preparation method comprises the following steps: S1: According to weight proportions, polypropylene, high-density polyethylene, ethylene-octene polymer elastomer, flame retardant, silicone resin microspheres, and polytetrafluoroethylene are stirred and mixed uniformly; S2: melt blending, extrusion and granulation by a twin-screw extruder to obtain polypropylene composite particles; In step S1, the stirring speed is 150-250 r / min and the time is 20-26 min.

6. A separator prepared from the polypropylene composite particles according to any one of claims 1 to 4.

7. The separator according to claim 6, characterized in that The partition is used for automobile seats and / or cushions; the partition is arranged between the sponge and the non-woven fabric.

8. The separator according to claim 7, characterized in that The preparation method of the partition is as follows: placing the polypropylene composite particles according to any one of claims 1 to 4 in a single screw machine for melting and plasticizing, extruding a sheet, vacuum forming, and cooling to shape.

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