CN104448882A - Injection molding material for vehicle soundproof pad - Google Patents

Abstract

The invention relates to the field of polymer materials and in particular relates to an injection molding material for a vehicle soundproof pad. The injection molding material is prepared from the following components in parts by weight: 5-10 parts of low density polyethylene, 10-15 parts of a propenyl elastomer, 50-70 parts of nano barium sulfate, 0-20 parts of nanometer calcium carbonate, 3-5 parts of flow modifier, 0.7-1.2 parts of carbon black, 0.5-2 parts of a coupling agent and 0.4-0.6 part of a compound antioxidant. The injection molding material fundamentally overcomes contradiction of fluidity, demoulding performance and injection molding processability of a high filling composite and particularly has the mechanical properties including flexibility of an elastomer material, the stress whitening resistance and excellent tear strength resistance while being excellent in the molding processability and the demoulding performance.

Description

A kind of vehicle noise insulation pad injectable plastic material

Technical field

The present invention relates to polymeric material field, particularly a kind of injectable plastic material for vehicle noise insulation pad.

Background technology

Orthodox car sound insulating pad material is filled barium sulfate by EVA elasticity height and is formed through plastic uptake technique, and plastic uptake technique has stricter requirement to goods: 1. plastics sucking moulding technique can only produce the product that wall thickness differs greatly; 2. the wall thickness of plastics sucking moulding generally 1 within the scope of 2mm or thinner; 3. the product's dimensional precision of plastics sucking moulding is poor, and its relative errors is more than one of percentage.

So-called injection moulding refers to injects in mould by the injection of material of heating and melting, after cooling with solidification, obtains the method for products formed.Its detailed process is, granular or powdered plastic are sent into the barrel of heating from the hopper of injection moulding machine, molten state is become through heating plasticizing, exert pressure again and inject closed mold cavity by nozzle, keep the shape that die cavity is given by hardening by cooling, die sinking just completes a work period after taking out colloid.

Propylene-based elastomeric is the novel elastomer of the major chemical company such as Exxon Mobil, Mitsui Chemicals exploitation in recent years, it is high that it has melt flow rate (MFR), to temperature and shear very sensibility elasticity body, along with temperature raises and shearing rate increase, its melt viscosity reduces very fast, easier than conventional vinyl elastomeric injection molding technique, in addition, high based elastomers material of filling is easy to occur blushing, the easy sticking to mould when injection moulding, cause certain difficulty to Shooting Technique, and propylene-based elastomeric solves this problem well.

Summary of the invention

Not enough in order to make up traditional plastic uptake technique, the invention discloses the difficult problem that injection molded automobile sound insulating pad material fundamentally solves plastics sucking moulding, and technique is easy to control, price is relatively low, has filled up the blank of this product domestic in injectable plastic material field.

For solving the problems of the technologies described above, the technical solution used in the present invention is:

A kind of vehicle noise insulation pad injectable plastic material, the component comprising following weight part is prepared from: 5-10 part Low Density Polyethylene, 10-15 part propylene-based elastomeric, 50-70 part nano barium sulfate, 0-20 part nano-calcium carbonate, 3-5 part flow ability modifying agent, 0.7-1.2 part carbon black, 0.5-2 part coupling agent, 0.4-0.6 part compound antioxidant.

Wherein, described flow ability modifying agent is oxidized polyethlene wax.Described coupling agent is titanic acid ester.Described compound antioxidant is that antioxidant 1010 and irgasfos 168 are composite in 3: 4 ratios.

The present invention also provides a kind of making method of vehicle noise insulation pad injectable plastic material, it is characterized in that, comprises the following steps:

A, described coupling agent and described nano barium sulfate, described nano-calcium carbonate are added high-speed mixing pot, obtain pretreated filler at 80-120 DEG C of surface preparation 2-6 minute;

B, by described Low Density Polyethylene, described propylene-based elastomeric, described flow ability modifying agent, described carbon black, after described compound antioxidant and described pretreated filler put into Banbury mixer banburying, then through twin screw extruder 130-150 DEG C mixing, extrude, cool, granulation processes.

Product of the present invention relate to the formulating of recipe of the mobility of high packing material, release property, snappiness, stress-whitening resistance, capture auto sound cushion material in mobility, release property, snappiness, the multinomial gordian technique such as stress-whitening resistance, fundamentally overcome the contradiction of the mobility of high filled composite materials, release property and injection moulding processibility, while particularly this Project Product has excellent molding processibility and release property, there is the snappiness of elastomer material, stress-whitening resistance, the mechanical propertys such as excellent tearing toughness.

Embodiment

Below in conjunction with the embodiment in the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.

Embodiment 1:

By 0.5KG titanic acid ester, 54KG nano barium sulfate, 6KG nano-calcium carbonate add high-speed mixing pot, within 4 minutes, obtain pretreated filler 100 DEG C of surface preparations;

By the pretreated filler that obtains and 5KG Low Density Polyethylene, 10KG propylene-based elastomeric, 3KG oxidized polyethlene wax, 0.7KG carbon black, 0.257KG antioxidant 1010,0.343KG irgasfos 168 puts into Banbury mixer 150 DEG C of banburyings after 10 minutes, then through twin screw extruder 140 DEG C mixing, extrude, cool, granulation processes.

The sound insulating pad compounded mix proportion obtained is 2.2, can obtain better soundproof effect; Its material property representative value is: melt flow index 55g/10min (190 DEG C, 2.16kg), tensile strength 1.67MPa, elongation at break 400, and tear strength is 15000N/m, and shore hardness A is 74.

Embodiment 2:

By 0.8KG titanic acid ester, 70KG nano barium sulfate adds high-speed mixing pot, within 6 minutes, obtains pretreated filler 80 DEG C of surface preparations;

By the pretreated filler that obtains and 10KG Low Density Polyethylene, 13KG propylene-based elastomeric, 5KG oxidized polyethlene wax, 1.2KG carbon black, 0.171KG antioxidant 1010,0.229KG irgasfos 168 put into Banbury mixer 140 DEG C of banburyings after 15 minutes, then through twin screw extruder 130 DEG C mixing, extrude, cool, granulation processes.

The sound insulating pad compounded mix proportion obtained is 2.23, can reduce weight on Automobile under the good soundproof effect prerequisite of maintenance.Its material property representative value is: melt flow index 65g/10min (190 DEG C, 2.16kg), tensile strength 1.52MPa, elongation at break 400, and tear strength is 13000N/m, and shore hardness A is 71.

Embodiment 3:

By 2KG titanic acid ester, 60KG nano barium sulfate, 20KG nano-calcium carbonate add high-speed mixing pot, within 2 minutes, obtain pretreated filler 120 DEG C of surface preparations;

By the pretreated filler that obtains and 7KG Low Density Polyethylene, 15KG propylene-based elastomeric, 4KG oxidized polyethlene wax, 1KG carbon black, 0.214KG antioxidant 1010,0.286KG irgasfos 168 put into Banbury mixer 160 DEG C of banburyings after 8 minutes, then through twin screw extruder 150 DEG C mixing, extrude, cool, granulation processes.

Its material property representative value is: melt flow index 55g/10min (190 DEG C, 2.16kg), tensile strength 1.48MPa, elongation at break 350, and tear strength is 13000N/m, and shore hardness A is 77.

Vehicle noise insulation pad material melt index melt index of the present invention reaches 50g/10min, 190 DEG C of * 2.16kg, other physical indexs such as intensity (injection temperature 180-200 DEG C, injection pressure 80-100BAR) can be met again, there is excellent molding processibility; Product of the present invention can fold more than 100 times continuously and not occur blushing, has excellent stress-whitening resistance; Further, there is not drawing crack phenomenon when product ejects in the easy demoulding of product of the present invention.

Above-mentioned embodiment is intended to illustrate that the present invention can be professional and technical personnel in the field and realizes or use; modifying to above-mentioned embodiment will be apparent for those skilled in the art; therefore the present invention includes but be not limited to above-mentioned embodiment; any these claims or specification sheets of meeting describes; meet and principle disclosed herein and novelty, the method for inventive features, technique, product, all fall within protection scope of the present invention.

Claims (5)

1. a vehicle noise insulation pad injectable plastic material, it is characterized in that, the component comprising following weight part is prepared from: 5-10 part Low Density Polyethylene, 10-15 part propylene-based elastomeric, 50-70 part nano barium sulfate, 0-20 part nano-calcium carbonate, 3-5 part flow ability modifying agent, 0.7-1.2 part carbon black, 0.5-2 part coupling agent, 0.4-0.6 part compound antioxidant.

2. vehicle noise insulation pad injectable plastic material according to claim 1, is characterized in that, described flow ability modifying agent is oxidized polyethlene wax.

3. vehicle noise insulation pad injectable plastic material according to claim 1, is characterized in that, described coupling agent is titanic acid ester.

4. vehicle noise insulation pad injectable plastic material according to claim 1, is characterized in that, described compound antioxidant is that antioxidant 1010 and irgasfos 168 are composite in 3: 4 ratios.

5. the making method of vehicle noise insulation pad injectable plastic material as described in any one of claim 1-4, is characterized in that, comprise the following steps:

A, described coupling agent and described nano barium sulfate, described nano-calcium carbonate are added high-speed mixing pot, obtain pretreated filler at 80-120 DEG C of surface preparation 2-6 minute;

B, by described Low Density Polyethylene, described propylene-based elastomeric, described flow ability modifying agent, described carbon black, after described compound antioxidant and described pretreated filler put into Banbury mixer banburying, then through twin screw extruder 130-150 DEG C mixing, extrude, cool, granulation processes.