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Polymer alloy material and preparation method thereof as well as forming method of oil tank

A polymer alloy and forming method technology, applied in the field of fuel tanks, can solve the problems of high cost, complex process, poor production effect of fuel tanks, etc., and achieve the effect of small warping deformation and improved surface appearance performance

Inactive Publication Date: 2015-12-02
JINHUA JIETE PACKING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ethylene-vinyl alcohol copolymer (EVOH) has high barrier properties. Polyethylene (PE) is used as the main material, and EVOH is layered as a barrier layer to compound fuel tanks in PE. At present, most of them are formed by multi-layer extrusion blow molding. Fuel tanks are made with advanced technology, which is complex and costly, and the production effect is not good for fuel tanks with metal inserts and complex shapes.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In this embodiment, the production of a high-barrier fuel tank is taken as an example, and the specific steps are as follows:

[0023] The prepared raw materials are EVOH, PA and PE, among which EVOH is the highest barrier polymer material, PA is a medium barrier polymer material, but it has good oil corrosion resistance, PE is a low barrier polymer material, oil resistance Better, but its outstanding advantages are that it is especially suitable for rotational molding, with good comprehensive performance and low cost.

[0024] Dry the raw materials first, then weigh 6 parts of PA, 2 parts of EVOH, 70 parts of MLLDPE, 1 part of interface modifier and appropriate amount of additives, put the above raw materials into the mixer and mix them evenly Shearing twin-screw melt mixing extrudes the strands and cuts them into granular polymer alloy materials. The phase structure of the polymer alloy material is a "sea-island" phase state, in which the island phase (dispersed phas...

Embodiment 2

[0030] In this embodiment, the production of a high-barrier fuel tank is taken as an example, and the specific steps are as follows:

[0031] Dry the raw materials first, then weigh 1 part of PA, 1 part of EVOH, 10 parts of MLLDPE, 0.5 part of interface modifier and appropriate amount of additives, put the above raw materials into the mixer and mix them evenly, and the mixture is passed through high shear Shearing twin-screw melt mixing extrudes the strands and cuts them into granular polymer alloy materials. The phase structure of the polymer alloy material is a "sea-island" phase state, in which the island phase (dispersed phase) is dispersed in the sea phase (continuous phase), and the sea phase is MLLDPE or other materials that are compatible with it, The island phase can be tiny EVOH, PA or eutectic particles of EVOH and PA. The above three island phases can exist in the same sea phase at the same time, or one or two of them can be selected to exist in the same sea phase....

Embodiment 3

[0034] In this embodiment, the production of a high-barrier fuel tank is taken as an example, and the specific steps are as follows:

[0035] Dry the raw materials first, then weigh 10 parts of PA, 1 part of EVOH, 50 parts of MLLDPE, 1 part of interface modifier and an appropriate amount of additives, put the above raw materials into a mixer and mix them evenly, and the mixture is passed through a high-shear Shearing twin-screw melt mixing extrudes the strands and cuts them into granular polymer alloy materials. The phase structure of the polymer alloy material is a "sea-island" phase state, in which the island phase (dispersed phase) is dispersed in the sea phase (continuous phase), and the sea phase is MLLDPE or other materials that are compatible with it, The island phase can be tiny EVOH, PA or eutectic particles of EVOH and PA. The above three island phases can exist in the same sea phase at the same time, or one or two of them can be selected to exist in the same sea pha...

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Abstract

The invention provides a polymer alloy material and a preparation method thereof as well as a forming method of an oil tank, and belongs to the technical field of fuel oil tanks to solve the problems of complex process and insufficient barrier property of an existing fuel oil tank. The forming method of the oil tank comprises the steps of modifying EVOH, PA and PE into the polymer alloy material by virtue of extrusion granulation at first, then grinding the alloy material into powder particles, adding the powder particle into a rotary mold once, and performing rotational molding by using a rotational molding machine to prepare the oil tank, wherein the polymer alloy material is in the form of particles, the phase structure of the material is of a 'sea-island' phase state, an island phase is dispersed in a sea phase, the sea phase is PE, and the island phase is a blend melt of EVOH and PA or EVOH and PA. According to the forming method provided by the invention, by using the melting point difference and the melt flow viscosity difference of each component, the process condition of rotational molding is appropriately controlled, and the fuel oil tank with a high barrier function can be manufactured in the same way; and the polymer alloy material has a broad application prospect in the market of oil tanks containing metal inserts and being complex in shape.

Description

technical field [0001] The invention belongs to the technical field of fuel oil tanks, and relates to a barrier polymer alloy material for fuel oil tanks, a manufacturing method thereof, and a method for manufacturing fuel tanks using the polymer alloy material. Background technique [0002] The all-plastic fuel tank for vehicles has become one of the important contents of the lightweight safety reform of automobiles. It is an inevitable development trend to replace metal fuel tanks with plastics. Fuel tanks are important safety and regulatory components for vehicles. For environmental protection , material anti-corrosion performance optimization requirements are getting higher and higher, especially the strict requirements of high barrier and low permeability for gasoline and methanol gasoline, and in order to reduce the production cost of fuel tanks, promote the development of polymer materials in the direction of high barrier. Ethylene-vinyl alcohol copolymer (EVOH) has h...

Claims

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Application Information

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IPC IPC(8): C08L23/08C08L77/00
CPCC08L23/0815C08L2203/16C08L2205/03C08L77/00C08L23/0861
Inventor 韩玉麟周卫中向军
Owner JINHUA JIETE PACKING CO LTD
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