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A reinforced SMA composite material with low warpage and high dimensional stability for automobile structural parts and preparation method thereof

A dimensional stability and composite material technology, applied in the field of polymer materials, can solve the problems of affecting the size of the material, the adverse effect of glass fiber dispersion, and the low degree of isotropy of the material, so as to avoid low crystallization efficiency and crystallization tendency Low, low coefficient of linear expansion effect

Active Publication Date: 2022-07-26
华合新材料科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, excessive interfacial bonding will adversely affect the dispersion and distribution of glass fibers, thereby affecting the size effect of the material, which is an area that is rarely addressed in current research
Described in CN1803912A is a kind of glass fiber reinforced SMA resin for automobile instrument panel, and its emphases is to utilize preferred toughening agent to improve the insufficient problem of the impact resistance of material, and does not relate to the improvement of material size effect; CN103819862A then It adopts the upgrade of composite material processing method, and replaces chopped glass fiber with continuous long glass fiber, so as to improve the mechanical performance indicators such as material rigidity and impact resistance to a certain extent, but in fact, the long glass fiber used The melt impregnation method is a weak shear processing method, the bond between the base material and the glass fiber is lower than the melt shear mixing method used for the short glass fiber, and the glass fiber is prone to a little while processing and flowing. Dimensional orientation characteristics, the degree of isotropy of the material is actually much lower than that of shorter glass fibers

Method used

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  • A reinforced SMA composite material with low warpage and high dimensional stability for automobile structural parts and preparation method thereof
  • A reinforced SMA composite material with low warpage and high dimensional stability for automobile structural parts and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Weigh the SMA ternary resin, toughening agent, auxiliary dispersant, and heat stabilizer according to the data of Example 1 shown in Table 1, and mix them uniformly to obtain mixed raw materials.

[0040] The dried mixed raw materials are placed in the main feeding bin of a twin-screw extruder with close meshing and co-rotation, and are fed into the barrel of the extruder through the feeding screw, and the glass fiber is fed from the side feeding port. It is added to the extruder, the diameter of the extruder screw is 36mm, the length-diameter ratio L / D is 44, and the temperature of each zone of the main barrel from the feeding port to the head outlet is set as: 100°C, 190°C, 200°C, 215°C, 220°C, 220°C, 220°C, the main engine speed is 200 rpm, and the product is obtained after melt extrusion, cooling, granulation, drying and other processes.

[0041]Table 1 Formulation of reinforced SMA composites with low warpage and high dimensional stability for automotive structural...

Embodiment 2

[0044] Weigh SMA ternary resin, toughening agent, auxiliary dispersant, and heat stabilizer according to the data of Example 2 shown in Table 1, and mix them uniformly to obtain mixed raw materials.

[0045] The dried mixed raw materials are placed in the main feeding bin of a twin-screw extruder with close meshing and co-rotation, and are fed into the barrel of the extruder through the feeding screw, and the glass fiber is fed from the side feeding port. It is added to the extruder, the diameter of the extruder screw is 36mm, the length-diameter ratio L / D is 44, and the temperature of each zone of the main barrel from the feeding port to the head outlet is set as: 100°C, 190°C, 200°C, 215°C, 220°C, 220°C, 220°C, the main engine speed is 200 rpm, and the product is obtained after melt extrusion, cooling, granulation, drying and other processes.

Embodiment 3

[0047] Weigh SMA ternary resin, toughening agent, auxiliary dispersant, and heat stabilizer according to the data of Example 3 shown in Table 1, and mix them uniformly to obtain mixed raw materials.

[0048] The dried mixed raw materials are placed in the main feeding bin of a twin-screw extruder with close meshing and co-rotation, and are fed into the barrel of the extruder through the feeding screw, and the glass fiber is fed from the side feeding port. It is added to the extruder, the diameter of the extruder screw is 36mm, the length-diameter ratio L / D is 44, and the temperature of each zone of the main barrel from the feeding port to the head outlet is set as: 100°C, 190°C, 200°C, 215°C, 220°C, 220°C, 220°C, the main engine speed is 200 rpm, and the product is obtained after melt extrusion, cooling, granulation, drying and other processes.

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Abstract

The invention relates to a reinforced SMA composite material with low warpage and high dimensional stability for automobile structural parts and a preparation method thereof. ~40 parts, 2-10 parts of toughening agent, 2-15 parts of auxiliary dispersant, and 1-8 parts of heat stabilizer; the advantages of the present invention are: it solves the problem of low shrinkage of some large structural parts and outer covering parts in current automobiles. , The urgent need for materials with low warpage and high dimensional stability, through the selection of SMA materials of specific specifications, to form a moderate interface bonding state with the reinforced glass fiber, and the use of dispersants to ensure that the reinforced glass fiber is in the processing and injection molding process. It has a more uniform distribution and dispersion effect; the material has the dimensional characteristics of low shrinkage and low warpage, as well as the performance characteristics of high impact resistance and good thermal stability, which can effectively reduce the defective splicing rate of parts and improve the assembly quality. , which helps the vehicle to avoid abnormal noise and other undesirable phenomena in the later period of use.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, in particular to a reinforced SMA composite material with low warpage and high dimensional stability for automobile structural parts and a preparation method thereof. Background technique [0002] At present, the development trend of lightweight and environmental protection in the automotive industry has become increasingly popular, and the material selection concept and principle of "replacing steel with plastic" has become a consensus in the automotive industry. Automobile structural parts can be divided into main structural parts (such as body frame, ABC column, chassis frame, etc.), secondary structural parts (such as instrument panel frame, central passage frame, door inner panel frame, tailgate frame, etc.) etc.), and secondary structural parts are the earliest and most mature areas for high-performance fiber-reinforced thermoplastics to replace steel and realize automotive lightw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L35/06C08L23/08C08K13/04C08K7/14C08K7/10C08K3/34C08K3/04C08J5/04
CPCC08J5/043C08J2335/06C08J2423/08C08K13/04C08K7/14C08K7/10C08K3/34C08K3/042
Inventor 徐凯华
Owner 华合新材料科技股份有限公司
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