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Composite bumper and preparation method thereof

A bumper and composite film technology, applied to bumpers and other directions, can solve problems such as low shrinkage rate, high heat distortion temperature, and complex raw materials, and achieve the effect of improving impact resistance and mechanical properties

Active Publication Date: 2021-09-07
WUHAN TEXTILE UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention patent with the application number CN201510193398.X discloses a high-impact modified polypropylene bumper material, which includes polypropylene, tetrakis-(2,6-xylyl)resorcinol two Phosphate ester, tetrakis-(2,6-xylyl)hydroquinone diphosphate, metallocene polyolefin, nylon, maleic anhydride, thermoplastic polyurethane, inorganic composite particles, vinyltriethoxysilane, ethylene-propylene Rubber, polyethylene, shear thickener, polym-phenylene isophthalamide fiber, antistatic agent, antioxidant, dispersant, plasticizer, ultraviolet absorber; with low shrinkage, high flow, It has good weather resistance and paint performance, and has the characteristics of high toughness, high strength, high elongation at break and high heat distortion temperature. However, the raw materials of this method are complicated, and the impact resistance of the prepared bumper material is not significant enough
[0004] The invention patent with the application number CN201510194389.2 discloses a high-impact and aging-resistant automobile bumper. The materials used to prepare the bumper include polypropylene, trichloroethyl phosphate, thermoplastic polyurethane, phenolic resin, thermosetting acrylic resin, Ethylene-propylene rubber, polyethylene, shear thickener, polym-phenylene isophthalamide fiber, antistatic agent, antioxidant, dispersant, plasticizer, 4-benzoyloxy-2, 2,6,6-tetramethylpiperidine, 2-(2'-hydroxy-3',5'-di-tert-phenyl)-5-chlorinated benzotriazole; with high toughness, high strength, elongation at break It has the characteristics of high elongation and high heat distortion temperature, but the disadvantage of this method is that the prepared raw materials are complicated, the prepared bumper does not have flame retardancy, and the impact resistance has not been greatly improved
[0006] The invention patent with application number CN201811433574.2 discloses a polyurethane bumper and its preparation method. The polyurethane bumper prepared by this method is composed of polyether polyol, polytetramethylene glycol, MDI, polymer polyol, amine catalyst, Composed of tin catalyst, chain extender, water and foam stabilizer, it has good strength, resilience, damping and shock resistance, but this method does not greatly improve the impact resistance of the bumper

Method used

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  • Composite bumper and preparation method thereof
  • Composite bumper and preparation method thereof
  • Composite bumper and preparation method thereof

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preparation example Construction

[0032] see figure 1 As shown, the invention provides a kind of preparation method of composite bumper, comprises the steps:

[0033] S1. Pretreatment: immerse the bumper base in the polyurethane resin solution, take it out after fully infiltrating, and then dry and pretreat the bumper base with the polyurethane resin on its surface at 80°C for 10-15s;

[0034] S2, the preparation of polyurethane composite film;

[0035] S3. Coating and hot pressing: Lay a layer of polyurethane composite film described in step S2 on the bumper substrate pretreated in step S1, and heat press at 100-140°C for 5-15 minutes to prepare a composite bumper .

[0036] Wherein, step S2 comprises the following steps:

[0037] S21. Preparation of casting solution: prepare a mixed solution of toluene and N,N-dimethylformamide, then add triphenyl phosphate, inorganic flame retardant, stabilizer and thermoplastic polyurethane particles in sequence and mix evenly, stir until completely dissolved and vacuum ...

Embodiment 1

[0048] Preparation method of composite bumper:

[0049] S1. Pretreatment: immerse the bumper base in the polyurethane resin solution, take it out after fully infiltrating, and then dry the bumper base loaded with the polyurethane resin on the surface for 10s at 80°C; wherein, the polyurethane The resin solution is composed of 30wt% polyurethane resin and 70wt% N,N-dimethylformamide.

[0050] S2, the preparation of polyurethane composite film:

[0051] S21. Preparation of casting solution: Add organic flame retardant triphenyl phosphate (TPP) into toluene solvent to disperse evenly, stir at 300r / min for about 20min; then add N,N-dimethylformamide (DMF) solvent After mixing evenly, add thermoplastic polyurethane particles (TPU), inorganic flame retardant magnesium hydroxide and stabilizer, stir at 600r / min for 4 hours, and the stirring temperature is 25°C. Membrane fluid;

[0052] Wherein, in the casting solution, the mass fraction of the mixed solvent of toluene and N,N-dime...

Embodiment 2-6

[0067] The difference from Example 1 is that in step S2, the ratio of TOL / DMF in the casting solution is different, and the other steps are basically the same, and will not be repeated here.

[0068] Table 2 is TOL / DMF ratio setting and mechanical performance parameter in embodiment 2-6

[0069]

[0070] Embodiment 1 and embodiment 2-6 are analyzed in conjunction with table 2:

[0071] Along with the increase of toluene ratio, the impact resistance of the composite bumper prepared by the present invention increases, and this is mainly because when adopting the polyurethane composite film that toluene and nitrogen nitrogen dimethylformamide solvent system prepares, immersion in coagulation bath During the precipitation process, the increase in the proportion of hydrophobic toluene can slow down the diffusion rate of the solvent in the polyurethane film casting liquid, so that water cannot diffuse into the polyurethane film, and toluene can only swell the polyurethane, so tha...

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Abstract

The invention provides a composite bumper and a preparation method thereof. The composite bumper includes a bumper base and a polyurethane composite film for covering the bumper base; the polyurethane composite film is composed of thermoplastic polyurethane, a stabilizer and a flame retardant. The preparation method of the composite bumper is as follows: first, the bumper substrate is subjected to polyurethane resin solution infiltration pretreatment, and then a polyurethane composite film is prepared, and finally the polyurethane composite film is coated on the pretreated bumper substrate, and heat The composite bumper was prepared by pressure treatment. The composite bumper prepared by the invention has excellent impact resistance, mechanical properties, heat resistance, ultraviolet resistance and excellent flame retardancy. The preparation method of the invention is simple in operation, low in cost, and easy to popularize and apply on a large scale.

Description

technical field [0001] The invention relates to the field of auto parts materials, in particular to a composite bumper and a preparation method thereof. Background technique [0002] Nowadays, the materials of automobile bumpers are mostly made of plastic, mainly located at the front (front bumper) and rear (rear bumper); in addition to maintaining the original protection function, automobile plastic bumpers also pursue their own light weight. Quantification, thereby reducing vehicle weight and reducing fuel consumption. At present, polypropylene materials are widely used in the preparation of automobile plastic bumpers, which have the advantages of good comprehensive strength, easy processing and molding, and recyclability; but at present, traditional plastic bumper materials have poor toughness and impact resistance. Shortcomings, which will affect the safety performance of the car. Therefore, improving the impact resistance has become an urgent problem to be solved in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B60R19/03C08J5/18C08L75/04C08K5/523C08K3/22
CPCB60R19/03C08J5/18C08J2375/04C08K5/523C08K2003/2224
Inventor 刘欣李仁豪张春华王云夏良君李晨徐卫林
Owner WUHAN TEXTILE UNIV
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