An integrated high-toughness polyester elastomer wheel rim air bag and a preparation method thereof

Abstract

The application provides a one-piece high-toughness polyester elastomer wheel rim air bag and a preparation method thereof, and belongs to the technical field of bicycle wheel rim air bags.The wheel rim air bag is composed of an outer layer, a middle layer and an inner layer, the outer layer comprises 30-40% TPEE, 30-40% copolymerized PP, 10-30% POE and 10-20% modified fluoropolymer, the middle layer comprises 70-90% TPEE, 5-30% POE and 1%-5% antioxidant, and the inner layer comprises 95% TPEE and 5% antioxidant.The polyester elastomer wheel rim air bag provided by the application has high toughness, is not prone to air leakage and brittle fracture, can be integrally blow-molded, does not need to be pressed and does not need to be pre-processed for moisture absorption, thereby greatly saving operation procedures and operation time.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bicycle rim air bag, in particular to an integrated high-toughness polyester elastomer rim air bag and a preparation method thereof. BACKGROUND

[0002] The carbon fiber bicycle rim generally uses a "donut" air bag, which is formed by extruding a nylon air bag film and then pressing a pattern through a mold to form a circular shape. However, during the pressing process, the air bag has a risk of leakage due to different mold pressures. In addition, due to the water loss characteristics of nylon, the nylon air bag is prone to brittle fracture in a dry environment, greatly limiting the use environment of the nylon air bag. SUMMARY

[0003] Therefore, the present application provides an integrated high-toughness polyester elastomer rim air bag and a preparation method thereof. The polyester elastomer rim air bag provided by the present application has high toughness, is not prone to leakage and brittle fracture, can be integrally blow-molded, does not need to be pressed, and does not need to be pre-treated for moisture absorption, thereby greatly saving the operation process and operation time.

[0004] A first object of the present application is to provide an integrated high-toughness polyester elastomer rim air bag, which is composed of an outer layer, a middle layer and an inner layer. The outer layer includes the following components in percentage by weight: 30-40% TPEE, 30-40% copolymerized PP, 10-30% POE and 10-20% modified fluoropolymer. The middle layer includes the following components: 70-90% TPEE, 5-30% POE and 1%-5% antioxidant. The inner layer includes the following components: 95% TPEE and 5% antioxidant.

[0005] Further, the outer layer includes the following components in percentage by weight: 35% TPEE, 40% copolymerized PP, 15% POE and 10% modified fluoropolymer. The middle layer includes the following components: 75% TPEE, 20% POE and 5% antioxidant. The inner layer includes the following components: 95% TPEE and 5% antioxidant.

[0006] Further, the TPEE is a thermoplastic polyester elastomer, which is a block copolymer containing polyester hard segments and polyether soft segments. Further preferably, the TPEE is purchased from DuPont, the hardness of the TPEE in the outer layer is 40D-50D, the hardness of the TPEE in the middle layer is 30D-45D, and the hardness of the TPEE in the inner layer is 30D-50D.

[0007] Further, the copolymerized PP is a random copolymerized polypropylene, which is purchased from Taiwan Plastic Group and has a product model number of 3015S.

[0008] Further, the POE is a polyolefin elastomer, which refers to a random copolymer elastomer of ethylene and high-carbon alpha-olefins (1-butene, 1-hexene, 1-octene, etc.) by in-situ polymerization using a metallocene catalyst.

[0009] Further preferably, the POE is purchased from Mitsui Chemical, and the product model is 4070S.

[0010] Further, the modified fluoropolymer is Daikin fluorine unidyne brand TGPP21; the modified fluoropolymer can be efficiently and quickly enriched to the surface of the film, and the surface energy of the film is reduced.

[0011] Further, the antioxidant is a hindered phenolic antioxidant.

[0012] The second object of the present application is to provide a preparation method of the integrated high-toughness polyester elastomer wheel rim air bag, comprising the following steps:

[0013] (1) After mixing the components of the outer layer, the middle layer and the inner layer respectively, drying at 90-100℃, adding them into different barrels respectively, melting and extruding through screw heating, and then co-extruding through the die, blowing into film blanks through the air channel in the die, and standby;

[0014] (2) Adding a mass fraction of 5%-25% of water-based release agent into water, mixing uniformly to obtain a mixed solution containing water-based release agent, and standby;

[0015] (3) The film blank of step (1) is sequentially subjected to pinch roll traction, cooling and shaping of the mixed solution containing water-based release agent of step (2), and winding into a roll film;

[0016] (4) The roll film of step (3) is placed at a temperature of 25-40℃ for static setting for 24-48h;

[0017] (5) The film roll after setting of step (4) is sequentially subjected to cutting, heat sealing and blowing to obtain a circular shape of the wheel rim.

[0018] Further, the diameter of the film embryo of step (1) is in the range of 20mm-150mm.

[0019] Further, the water-based release agent of step (2) is specifically DAIFREE GW series fluorine-containing water-based release agent. The mixed solution containing water-based release agent can help the film blank to set, and on the other hand, the release agent can also cover the surface of the film blank, increasing the release property.

[0020] Compared with the prior art, the integral high-toughness polyester elastomer wheel rim air bag provided by the application does not contain silicon elements, does not cause silicon element migration, does not need extra spraying of a release agent, is environmentally friendly, has excellent tensile strength, can be integrally blow-molded, does not need a pressing process, greatly saves an operation process and operation time, and does not need moisture absorption and softening treatment before use, and can be used immediately after being taken out.

[0021] In the application, the TPEE and the POE have a synergistic effect after being compounded, so that the overall elasticity and toughness of the material are obviously improved compared with PA and PP. Therefore, compared with the existing air bag, in addition to being convenient to use, more importantly, the blow-molding extension in the forming mold is high, the inner wall of the product can be fitted, which cannot be replaced by the existing product, the bending of the carbon fiber composite material is reduced, the inner wall of the product is uniform and smooth, and the strength of the overall product is increased. DETAILED DESCRIPTION

[0022] To make the objectives, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work belong to the scope protected by the present application.

[0023] In the following examples, the test methods or test methods are conventional methods unless otherwise specified; the raw materials and auxiliaries are obtained from conventional commercial channels or prepared by conventional methods unless otherwise specified.

[0024] Example 1

[0025] The application provides an integral high-toughness polyester elastomer wheel rim air bag, which is composed of an outer layer, a middle layer and an inner layer. The outer layer comprises the following components in percentage by weight: 35% Dupont TPEE (hardness of 40D-50D), 40% copolymerized PP (3015s), 15% (Mitsui) POE (4070S) and 10% modified fluoropolymer. The middle layer comprises the following components: 75% Dupont TPEE (hardness of 30D-45D), 5% antioxidant (hindered phenolic antioxidant) and 20% POE (4070S). The inner layer comprises the following components: 95% Dupont TPEE (hardness of 30D-50D) and 5% antioxidant (hindered phenolic antioxidant).

[0026] The application further provides a preparation method of the integrated high-toughness polyester elastomer wheel rim air bag, and specific steps are as follows.

[0027] (1) After the components of the outer layer, the middle layer and the inner layer are mixed respectively, drying at 90-100℃, adding into different barrels respectively, heating and melting extrusion through screw, co-extrusion through die, blowing into film blank through the air channel arranged in the die, the diameter of the film blank is in the range of 20mm-150mm, standby;

[0028] (2) Adding 25% of DAIFREE GW series fluorine-containing water-based release agent in mass fraction into cooling water, mixing uniformly to obtain a mixed solution containing water-based release agent, standby;

[0029] (3) After the film blank in step (1) comes out of the die, vertically downward, then pulling through the herringbone pinch roll, cooling and shaping the mixed solution containing water-based release agent in step (2) to make the thickness uniform, then pulling through the traction machine and winding through the winding machine to form a roll film;

[0030] (4) Placing the roll film in step (3) under the temperature condition of 40℃ for static setting and shaping for 24-48h, so that the whole has the shape of outer circular arc;

[0031] (5) Cutting the film roll after shaping in step (4) into the length required by the wheel rim, sealing one end by using a heat sealing machine, and automatically forming the circular shape of the wheel rim after blowing.

[0032] Comparative example 1

[0033] The nylon air bag is made of pure nylon.

[0034] Performance comparison:

[0035] Group Example 1 Comparative Example 1 Test Method Tensile Strength (Transverse) 100 Mpa 65 Mpa ASTM D882 Tensile Strength (Machine Direction) 100 Mpa 65 Mpa ASTM D882 Elongation (Transverse) 500％ 300％ ASTM D882 Elongation (Machine Direction) 600％ 300％ ASTM D882 Surface Tension <28 mN / m >28 Dyne Pen Recommended Maximum Service Temperature 160℃ 160℃ /

[0036] Note: The performance test environment temperature is 23℃, the environment humidity is 50RH, and the test thickness of the air bag is 100μm.

[0037] The above only describes the preferred embodiments of the present application, and it should be noted that for those skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A one-piece high-toughness polyester elastomer wheel rim air bag, comprising an outer layer, a middle layer, and an inner layer, characterized in that, By weight percentage, the outer layer comprises the following components: 30-40% TPEE, 30-40% copolymer PP, 10-30% POE, and 10-20% modified fluoropolymer; the middle layer comprises the following components: 70-90% TPEE, 5-30% POE, and 1%-5% antioxidant; and the inner layer comprises the following components: 95% TPEE and 5% antioxidant.

2. The integrated high-toughness polyester elastomer wheel rim air bag according to claim 1, comprising an outer layer, a middle layer, and an inner layer, characterized in that, By weight percentage, the outer layer comprises the following components: 35% TPEE, 40% copolymer PP, 15% POE, and 10% modified fluoropolymer; the middle layer comprises the following components: 75% TPEE, 20% POE, and 5% antioxidant; and the inner layer comprises the following components: 95% TPEE and 5% antioxidant.

3. The method for preparing the integrated high-toughness polyester elastomer wheel rim air bag according to any one of claims 1 or 2, characterized in that, Includes the following steps: (1) Mix the components of the outer layer, middle layer and inner layer separately, dry them at 90-100℃, add them to different barrels, heat and melt them through the screw, extrude them through the die, and blow them into a film blank through the air flow channel in the die for later use; (2) Add 5%-25% fluorinated water-based release agent to water, mix well and set aside; (3) The film blank described in step (1) is sequentially passed through clamping rollers for traction, cooling and shaping, and then wound into a roll film; (4) Place the roll film described in step (3) at a temperature of 25-40℃ for 24-48 hours to set. (5) After the film roll is shaped in step (4), it is cut, heat-sealed and blown with air to obtain a circular wheel shape.

4. The method for preparing the integrated high-toughness polyester elastomer wheel rim air bag according to claim 3, characterized in that, The diameter of the preform in step (1) is in the range of 20mm-150mm.