CN103144681A

CN103144681A - Automobile fender and fabrication method

Info

Publication number: CN103144681A
Application number: CN201310083286XA
Authority: CN
Inventors: 杨丹; 文汉防; 邹德平; 李冬滨; 陈深
Original assignee: DONGFENG (SHIYAN) NON-METAL PARTS Co Ltd
Current assignee: Dongshi Yinlun Hubei Nonmetallic Parts Co ltd
Priority date: 2013-03-15
Filing date: 2013-03-15
Publication date: 2013-06-12
Anticipated expiration: 2033-03-15
Also published as: CN103144681B

Abstract

The invention provides an automobile fender and a fabrication method. The automobile fender is fabricated by filling a polyurethane foam material into a PE (polyethylene) blow molding piece with side holes. Polyurethane foam for filling comprises a component A and a component B, wherein the component A is 47-54 parts by mass of polymethylene polyphenyl polyisocyanate (PAPI), with relative density of 1.2, a burning point of 218 DEG C, and viscosity of 900mpa*s; the component B is a mixture of polyether polyol, water and a foam stabilizer, and has viscosity of about 300-400mpa*s; bifunctional polyether polyol with a hydroxyl value of 108-196mgKOH/g accounts for 40-50 parts by mass; bifunctional polyether polyol with a hydroxyl value of 355-395mgKOH/g accounts for 3.4-10 parts by mass; the water accounts for 1.3-2.0 parts by mass; the organosilicon foam stabilizer accounts for 0.4 parts by mass; the component A and the component B are mixed uniformly and then react rapidly to generate the foam; the cream time of the mixed filling material is 30-150s; the gelation time is 1800s; and the foam volume multiplying power is about 12-18. Therefore, the obtained novel automobile fender has light weight, impact resistance and sound resistance.

Description

A kind of fender and preparation method

Technical field

The present invention relates to auto parts and components, specifically a kind of fender and preparation method.

Background technology

Fender generally is arranged on automotive wheel periphery or position, car bottom, and main rising stops that silt and ponding splash, and keeps the effect of car body cleaning.

At present the fender material adopts the homogenous materials such as PE, PP, GMT, PU more, and its corresponding forming process comprises injection moulding, rotational moulding, mold pressing and reaction injection molded (RIM); Once adopted PP injection moulding mudwing and two kinds of products of MDPE rotational-molding splash guard as Dong Feng Commercial, Jinan Auto Manufacturing General Factory produces the polyurethane elastomer mudwing with RIM technique, and certain domestic cross-country car has adopted the GMT mudwing of compression molding.

These adopt the mudwing of homogenous material manufacturing to have following problem: the mudwing volume of part is larger owing to heavily blocking, and the PP moulding easily produces buckling deformation, and in addition, for guaranteeing the plastic mud fender detail rigidity, the moulding wall thickness causes more greatly part heavier; The PE rotational-molding splash guard has good dimensional stability and rigidity, but this hollow and thin-walled part can send larger noise and may puncture when clashed into by sandstone; Adopt the PU elastic body mudwing of RIM technique manufacturing to have good weather resisting property, flexibility and impact resistance, but forming process is controlled complexity, profiled member is still needed can place in operation after slaking 12h in hot water.

Along with improving constantly of automobile request of advance, safety, energy-saving and environmental protection, comfortablely become current development of automobile theme; Firm, lightweight, each large automaker that is developed as pollution-free and that have a decrease of noise functions automotive parts pay close attention to.

Summary of the invention

The invention provides a kind of fender and preparation method, the mudwing that obtains thus has lightweight, anti-impact and good sound insulation value.

Technical scheme of the present invention is for this reason, a kind of fender, comprise the mudwing body, it is characterized in that: it is made by filled polyurethane foam in hollow plastic article, hollow plastic article is take blowing level PE resin as the base-material blow molding, and the blowing part side of moulding is provided with the Φ of being convenient to pour into a mould Charge 〉=8mm perforate thus.

improvement to such scheme is: described filling is made of A, B two components with the isocyanurate foam formula, wherein the A component is poly methylene poly phenyl poly isocyanate (PAPI: relative density 1.2,218 ℃ of burning-points), viscosity 900mpa.s accounts for the 47-54 of total mass umber, the B component is polyether glycol, water, the compound of foam stabilizer, viscosity is about 300-400mpa.s, wherein hydroxyl value is the 40-50 that the bifunctionality polyether glycol of 108-196 mgKOH/g accounts for the total mass umber, hydroxyl value is the 3.4-10 that the polyfunctionality polyether glycol of 355-395 mgKOH/g accounts for the total mass umber, water accounts for the 1.3-2.0 of total mass umber, 0.4 of silicone based foam stabilizer total mass umber, A, after mixing, two kinds of components of B can react rapidly foam generated, this mixes Charge cream time 30-150s, Gel time 1800s, foam volume multiplying power approximately 1.3.

A kind of preparation method of fender is:

1, according to selected blowing level PE material property index and the blow molding of the accessory size specification hollow mudwing Plastic Parts with hole, side position;

2, in proportion the isocyanurate foam Charge is made into A, B two components are stand-by;

3, calculate the Charge consumption of needs according to blowing part hollow volume and polyurethane combined material volume expansion ratio, and by this total consumption difference weighing A, B two components, it is mixed rear rapidly through empty the injection in cavity in blowing part side position;

4, place blowing part location, makes the material feeding side opening be positioned at the part top, can obtain hollow foam and fill the mudwing finished parts after 30min is solidified approximately in the reaction at normal temperatures of combination material.

Beneficial effect:

The present invention is based on the compound theory of material function, obtained a kind of Novel wheel guard for automobile in the mode of isocyanurate foam filled polyethylene blowing part, have lightweight, anti-impact and sound insulation value, embodied innovative characteristics.

The specific embodiment

The present invention is a kind of fender, comprise the mudwing body, make by filled polyurethane foam in hollow plastic article, hollow plastic article is take blowing level PE resin as the base-material blow molding, and the blowing part side of moulding is provided with the Φ of being convenient to pour into a mould Charge 〉=8mm perforate thus;

filling is made of A, B two components with the isocyanurate foam formula, and wherein the A component is poly methylene poly phenyl poly isocyanate (PAPI: relative density 1.2,218 ℃ of burning-points), and viscosity 900mpa.s accounts for the 47-54 of total mass umber, the B component is polyether glycol, water, the compound of foam stabilizer, viscosity is about 300-400mpa.s, wherein hydroxyl value is the 40-50 that the bifunctionality polyether glycol of 108-196 mgKOH/g accounts for the total mass umber, hydroxyl value is the 3.4-10 that the polyfunctionality polyether glycol of 355-395 mgKOH/g accounts for the total mass umber, water accounts for the 1.3-2.0 of total mass umber, 0.4 of silicone based foam stabilizer total mass umber, A, after mixing, two kinds of components of B can react rapidly foam generated, this mixes Charge cream time 30-150s, Gel time 1800s, the foam volume multiplying power is 12-18 times.

1, plastify-expect embryo according to batching-material to extrude-matched moulds air blowing-cooling and shaping-the die sinking pickup-remove the series of steps blow molding side direction mudwinges such as material folding.

Relevant main technologic parameters is: 170 ± 10 ℃ of barrel temperatures, extrusion pressure 70 ± 10KPa, inflationtime 100 ± 10S.This blowing part can be reserved side plug hole or moulding when moulding after, punching is to be used for the Charge cast.

2, be that approximately 11000ml and polyurethane combined material expansion ratio (12-18 doubly) calculate hollow lateral and need with the about 700g of Charge to the mudwing cavity according to blowing part cavity volume, with poly methylene poly phenyl poly isocyanate (PAPI) 335 g and bifunctionality polyether glycol (DL1000) 319g, polyfunctionality polyether glycol (SA-380) 22.8g, water 13.8g, after stirring, the compound of organic silicon surfactant (AK8805) 9.4g injects blowing part cavity by hole, side position immediately thus.

3, place blowing part location, makes the material feeding side opening be positioned at the part top, can obtain hollow foam and fill side direction mudwing finished parts after 30min is solidified approximately in the reaction at normal temperatures of combination material.

Table 1 is proportion relation table of the present invention

Table 1.

Claims

1. fender, comprise the mudwing body, it is characterized in that: it is made by filled polyurethane foam in hollow plastic article, hollow plastic article is take blowing level PE resin as the base-material blow molding, and the blowing part side of moulding is provided with the Φ of being convenient to pour into a mould Charge 〉=8mm perforate thus.

2. a kind of fender according to claim 1, it is characterized in that: described filling is made of A, B two components with the isocyanurate foam formula, wherein the A component is poly methylene poly phenyl poly isocyanate PAPI, its relative density 1.2,218 ℃ of burning-points, viscosity is 900mpa.s, accounts for the 47-54 of total mass umber; The B component is the compound of polyether glycol, water, foam stabilizer, and viscosity is 300-400mpa.s, and wherein hydroxyl value is the 40-50 that the bifunctionality polyether glycol of 108-196 mgKOH/g accounts for the total mass umber; Hydroxyl value is the 3.4-10 that the polyfunctionality polyether glycol of 355-395 mgKOH/g accounts for the total mass umber, water accounts for the 1.3-2.0 of total mass umber, 0.4 of silicone based foam stabilizer total mass umber, A, two kinds of components of B mix rear rapid reaction foam generated, this mixing Charge cream time is 30-150s, Gel time is 1800s, and the foam volume multiplying power is 12-18 times.

3. the preparation method of a fender is:

(1), according to selected blowing level PE material property index and the blow molding of the accessory size specification hollow mudwing Plastic Parts with hole, side position;

(2), in proportion the isocyanurate foam Charge is made into A, B two components are stand-by;

(3), calculate the Charge consumption of needs according to blowing part hollow volume and polyurethane combined material volume expansion ratio, and by this total consumption weighing A, B two components respectively, it is mixed rear rapidly through empty the injection in cavity in blowing part side position;

(4), blowing part location places, and makes the material feeding side opening be positioned at the part top, can obtain hollow foam and fill the mudwing finished parts after 30min is solidified approximately in the reaction at normal temperatures of combination material.