CN110669275A - Micro-foaming automobile air duct material with strong shearing structure and preparation method thereof - Google Patents
Micro-foaming automobile air duct material with strong shearing structure and preparation method thereof Download PDFInfo
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Abstract
The invention relates to an automobile air duct and a preparation method thereof, in particular to a micro-foaming automobile air duct material with a strong shearing structure and a preparation method thereof. The material comprises the following components in parts by weight: 85-95 parts of polyethylene, 0-12 parts of filler, 0.3-1 part of viscosity regulator, 0.5-5 parts of foaming agent, 1-5 parts of foaming auxiliary agent, 0.2-1 part of antioxidant and 0.3-1 part of lubricant, and discloses a preparation method thereof. The material has excellent melt tensile property and gas wrapping property, solves the problem that the air duct with a strong shearing structure cannot be molded due to micro-foaming molding fracture and the like, shortens the molding period, and improves the production efficiency and the qualification rate of products. The aim of light weight is achieved under the condition that normal assembly and use of parts are not affected.
Description
Technical Field
The invention relates to an automobile air duct material and a preparation method thereof, in particular to a micro-foaming automobile air duct material with a strong shearing structure and a preparation method thereof, belonging to the technical field of materials.
Background
Under the double pressure of energy crisis and environmental pollution, light weight has become the inevitable trend of the development of the current automobile industry. According to related research, when the weight of the automobile is reduced by 10%, the oil consumption can be reduced by 8% to 10%. However, compared with the developed countries abroad, the weight of the whole car in China is 8-10% higher, the weight of the commercial car is 10-15% higher, and the weight of the car is reduced by 25-30% to keep up with the advanced level of the world. Therefore, the automobile lightweight task in China is very urgent. For automobile parts, micro-foaming is a very effective lightweight technology. However, when applied to automotive air conditioning ducts, significant challenges are encountered because: the structural design of the air duct is limited by a frame or other large-scale parts, a plurality of strong shearing structures can appear during the design of the mould, the air duct is easy to break or even can not be blown to form in the micro-foaming forming process due to the structures, and the application of the air duct is severely limited.
Disclosure of Invention
In order to solve the problems, the invention provides a micro-foaming automobile air duct material with a strong shearing structure and a preparation method thereof. The aim of light weight is achieved under the condition that normal assembly and use of parts are not affected.
In order to achieve the purpose, the invention adopts the following technical scheme:
a micro-foaming automobile air duct material with a strong shearing structure comprises the following components in parts by weight:
85-95 parts of polyethylene,
0-12 parts of filler
0.3 to 1 portion of viscosity regulator,
0.5 to 5 portions of foaming agent,
1-5 parts of a foaming auxiliary agent,
0.2-1 part of antioxidant;
0.3-1 part of lubricant.
The further technical scheme is that the polyethylene is a composition of ultrahigh molecular weight polyethylene and polyethylene with a long-chain branched structure, the branching degree is more than or equal to 6, and the carbon number of a branched chain is more than or equal to 20. The preferred polyethylene composition is a polyethylene composition having a degree of branching of 10 and a branched carbon number of 50.
The further technical scheme is that the filler is one of talcum powder, mica, calcium carbonate and glass beads, and the talcum powder is preferred.
The further technical proposal is that the viscosity regulator is one of oxidized polyethylene wax, polypropylene wax, ethylene-vinyl acetate-styrene copolymer and end-capped hydroxyethyl cellulose, and the oxidized polyethylene wax is preferred;
in a further technical scheme, the foaming agent is a nucleation heat absorption type foaming agent, such as nano-silica modified carbonate, nano-calcium oxide modified bicarbonate foaming agent, bentonite modified carbonate, nano-zinc oxide modified nitrate and the like, and the nano-calcium oxide modified bicarbonate foaming agent, such as nano-calcium oxide modified sodium bicarbonate, is preferred.
According to a further technical scheme, the foaming auxiliary agent is one of borate, tartrate, oxalate and adipate, preferably tartrate, such as sodium tartrate, potassium tartrate and the like.
The further technical proposal is that the antioxidant is one of 1010, 1098, 168, H10 and H318, preferably the antioxidant 1010; the lubricant is one of stearic acid, silicone, erucamide and stearic amide, and stearic acid is preferred.
A preparation method of a micro-foaming automobile air duct material with a strong shearing structure comprises the following steps:
the method comprises the following steps: mixing 85-95 parts of polyethylene, 0-12 parts of filler, 0.3-1 part of viscosity regulator, 1-5 parts of foaming auxiliary agent, 0.2-1 part of antioxidant and 0.3-1 part of lubricant in a mixer for 1-4min according to certain parts by weight, adding the mixture into a double-screw extruder through a hopper, granulating at the temperature of 140 plus 200 ℃, and obtaining the polyethylene composite material at the screw rotation speed of 200 plus 800 r/min;
step two: 0.5-5 parts of foaming agent and the polyethylene composite material obtained in the step one are fully mixed in a high-speed mixer in advance according to the parts by weight, and then are added into a charging barrel of a single-screw blow molding machine; blow molding the micro-foaming automobile air duct with the strong shearing structure at the temperature of 150-210 ℃.
Advantageous effects
Compared with the prior art, the invention has the following remarkable advantages:
1. according to the invention, through scientific and reasonable formula design, the polyethylene composite material with excellent melt tensile property and gas wrapping property for a product with a strong shearing structure is obtained, and other materials and the nucleating type foaming agent have synergistic effect, so that the problems of breakage and the like of an automobile air duct with the strong shearing structure in a micro-foaming forming process are solved, meanwhile, the use of the viscosity regulator shortens the product forming period, and the production efficiency and the qualification rate of the product are improved. Most importantly, the technology overcomes the structural design limitation of the micro-foaming air duct. Under the current technical conditions, the micro-foaming can not be applied to the product with the strong shearing structure, and the continuous forming can not be completed.
2. Compared with the existing products, the air duct diffusion agent has the advantages of low VOC emission, low odor and the like, and meets the emission requirement of a host factory on the air duct.
3. The preparation method of the material provided by the invention has the advantages of controllable process, low production cost, high efficiency and easiness in realization of industrialization.
Detailed Description
The preparation method of the micro-foaming automobile air duct material with the strong shearing structure comprises the following steps:
example 1
The method comprises the following steps: mixing 85 parts of polyethylene (15 parts of ultra-high molecular weight polyethylene and 70 parts of polyethylene), 12 parts of talcum powder of a filling agent, 0.3 part of oxidized polyethylene wax serving as a viscosity regulator, 1 part of sodium borate serving as a foaming auxiliary agent, 0.2 part of antioxidant 1010 and 1 part of stearic acid serving as a lubricant in a mixer according to certain parts by weight for 1min, adding the mixture into a double-screw extruder through a hopper, granulating at the temperature of 140 plus 200 ℃, and granulating at the screw rotation speed of 200 plus 800r/min to obtain a polyethylene composite material;
step two: 0.5 part of foaming agent nano calcium oxide modified sodium bicarbonate and the polyethylene composite material obtained in the step one are fully mixed in a high-speed mixer in advance according to the parts by weight, and then are added into a charging barrel of a single-screw blow molding machine; blow molding the micro-foaming automobile air duct with the strong shearing structure at the temperature of 150-210 ℃.
Wherein the polyethylene has a branching degree of 6 and a branched carbon number of 20.
Example 2
The method comprises the following steps: mixing 95 parts of polyethylene (20 parts of ultra-high molecular weight polyethylene and 75 parts of polyethylene), 0.5 part of oxidized polyethylene wax serving as a viscosity regulator, 3 parts of sodium tartrate serving as a foaming auxiliary agent, 1 part of antioxidant 168 and 0.5 part of silicone serving as a lubricant in a mixer for 4min according to certain parts by weight, adding the mixture into a double-screw extruder through a hopper, granulating at the temperature of 140 plus materials and 200 ℃, and rotating the screw at the speed of 200r/min to obtain a polyethylene composite material;
step two: 2 parts of nano calcium oxide modified sodium bicarbonate serving as a foaming agent and the polyethylene composite material obtained in the step one are fully mixed in a high-speed mixer in advance according to the parts by weight, and then the mixture is added into a charging barrel of a single-screw blow molding machine; blow molding the micro-foaming automobile air duct with the strong shearing structure at the temperature of 150-210 ℃.
The polyethylene has a branching degree of 10 and a branched carbon number of 50.
Example 3
The method comprises the following steps: mixing 88 parts of polyethylene (48 parts of ultra-high molecular weight polyethylene and 40 parts of polyethylene), 10 parts of filler, 1 part of polypropylene wax as a viscosity regulator, 5 parts of potassium adipate as a foaming auxiliary agent, 0.3 part of antioxidant 1010 and 0.6 part of stearic acid amide in a mixer according to certain parts by weight for 3min, adding the mixture into a double-screw extruder through a hopper, granulating at the temperature of 140 plus 200 ℃, and obtaining the polyethylene composite material at the screw rotating speed of 500 r/min;
step two: fully mixing 5 parts of nano calcium oxide modified ammonium bicarbonate serving as a foaming agent and the polyethylene composite material obtained in the step one in a high-speed mixer in advance according to the parts by weight, and then adding the mixture into a charging barrel of a single-screw blow molding machine; blow molding the micro-foaming automobile air duct with the strong shearing structure at the temperature of 150-210 ℃.
The polyethylene has a branching degree of 12 and a branched carbon number of 36.
Example 4
The method comprises the following steps: mixing 90 parts of polyethylene, 50 parts of ultrahigh molecular weight polyethylene and 40 parts of polyethylene) by using 8 parts of glass beads as fillers, 0.8 part of terminated hydroxyethyl cellulose as a viscosity regulator, 4 parts of sodium borate as a foaming auxiliary agent, 0.5 part of antioxidant 1010 and 0.3 part of stearic acid as a lubricant in a mixer for 1-4min, adding the mixture into a double-screw extruder through a hopper, granulating at the temperature of 140 plus 200 ℃, and obtaining the polyethylene composite material at the screw rotating speed of 500 r/min;
step two: fully mixing 3 parts of nano zinc oxide modified ammonium nitrate serving as a foaming agent and the polyethylene composite material obtained in the step one in a high-speed mixer in advance according to the parts by weight, and then adding the mixture into a charging barrel of a single-screw blow molding machine; blow molding the micro-foaming automobile air duct with the strong shearing structure at the temperature of 150-210 ℃.
The polyethylene has a branching degree of 30 and a branched carbon number of 20.
According to the preparation method, the specific formulations of the examples 1, 2, 3 and 4 are shown in the following table:
the examples in the table above were tested and the performance results are shown in the following table:
performance Table of product embodiment of the invention
As can be seen from the above table, compared with comparative example 1, the melt elongation of the embodiment of the present invention is significantly increased, which can ensure good gas encapsulation and meet the requirement of high melt stretch when the blow molding product with strong shear structure is subjected to micro-foaming molding.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any equivalent changes or modifications made by those skilled in the art according to the spirit of the present invention should be covered within the scope of the present invention.
Claims (10)
1. The micro-foaming automobile air duct material with the strong shearing structure is characterized by comprising the following components in parts by weight:
85-95 parts of polyethylene,
0-12 parts of filler
0.3 to 1 portion of viscosity regulator,
0.5 to 5 portions of foaming agent,
1-5 parts of a foaming auxiliary agent,
0.2 to 1 part of antioxidant,
0.3-1 part of lubricant.
2. The micro-foaming automobile air duct material with the strong shearing structure as recited in claim 1, wherein: the polyethylene is a composition of ultrahigh molecular weight polyethylene and polyethylene with a long-chain branched structure, the branching degree of the polyethylene is more than or equal to 6, and the carbon number of a branched chain is more than or equal to 20.
3. The micro-foaming automobile air duct material with the strong shearing structure as recited in claim 2, wherein: the ultra-high molecular weight polyethylene and the polyethylene composition with the branching degree of 10 and the branched chain carbon number of 50.
4. The micro-foaming automobile air duct material with the strong shearing structure as recited in claim 1, wherein: the viscosity regulator is one of oxidized polyethylene wax, polypropylene wax, ethylene-vinyl acetate-styrene copolymer and terminated hydroxyethyl cellulose.
5. The micro-foaming automobile air duct material with the strong shearing structure as recited in claim 4, wherein: the viscosity regulator is oxidized polyethylene wax.
6. The micro-foaming automobile air duct material with the strong shearing structure as recited in claim 1, wherein: the foaming agent is a nucleation heat-absorption foaming agent which is nano-silica modified carbonate, nano-calcium oxide modified bicarbonate foaming agent, bentonite modified carbonate and nano-zinc oxide modified nitrate.
7. The micro-foaming automobile air duct material with the strong shearing structure as recited in claim 6, wherein: the nucleation heat absorption type foaming agent is a nano calcium oxide modified bicarbonate foaming agent.
8. The micro-foaming automobile air duct material with the strong shearing structure as recited in claim 1, wherein: the filler is one of talcum powder, mica, calcium carbonate and glass beads; the foaming auxiliary agent is one of borate, tartrate, oxalate and adipate; the antioxidant is one of 1010, 1098, 168, H10 and H318; the lubricant is one of stearic acid, silicone, erucamide and stearamide.
9. The micro-foaming automotive air duct material with the strong shear structure of claim 8, wherein: the filler is talcum powder; the foaming auxiliary agent is tartrate; the antioxidant is 1010; the lubricant is stearic acid.
10. The method for preparing a micro-foaming automobile air duct material with a strong shearing structure according to any one of claims 1 to 9, characterized in that: the method comprises the following steps:
the method comprises the following steps: mixing 85-95 parts of polyethylene, 0-12 parts of filler, 0.3-1 part of viscosity regulator, 1-5 parts of foaming auxiliary agent, 0.2-1 part of antioxidant and 0.3-1 part of lubricant in a mixer for 1-4min according to certain parts by weight, adding the mixture into a double-screw extruder through a hopper, granulating at the temperature of 140 plus 200 ℃, and obtaining the polyethylene composite material at the screw rotation speed of 200 plus 800 r/min;
step two: 0.5-5 parts of foaming agent and the polyethylene composite material obtained in the step one are fully mixed in a high-speed mixer in advance according to the parts by weight, and then are added into a charging barrel of a single-screw blow molding machine; blow molding the micro-foaming automobile air duct with the strong shearing structure at the temperature of 150-210 ℃.
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Application publication date: 20200110 |