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Fusion forming method of large massive thermoplastic polymer composite material

A thermoplastic polymer and composite material technology, which is applied in the field of fusion molding of large-sized bulk thermoplastic polymer composite materials, can solve the problems of insufficient plasticization of materials, increased manufacturing costs, low production efficiency, etc. Effect of uniformity, weight and system reduction, lower molding pressure

Inactive Publication Date: 2014-05-14
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is necessary to prepare bulk polymer composites with a diameter of more than 300mm, screw extrusion is more difficult, the equipment is larger, and the maintenance and use of equipment are very cumbersome.
The main problems of using single-screw or twin-screw extrusion process to prepare large-scale thermoplastic polymer composite materials containing solid fillers are insufficient plasticization of materials, uneven dispersion of materials, and insufficient compactness of bulk materials.
At present, the main method to solve the above problems is to use larger-sized molding equipment, and to improve the molding quality by mixing and plasticizing the materials multiple times. These measures will not only increase the manufacturing cost, but also lower the production efficiency.

Method used

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  • Fusion forming method of large massive thermoplastic polymer composite material
  • Fusion forming method of large massive thermoplastic polymer composite material
  • Fusion forming method of large massive thermoplastic polymer composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The polyurethane thermoplastic elastomer with a softening point of 70°C is selected as the polymer binder, and calcium carbonate powder with a particle size of less than 200 μm is added to the polyurethane thermoplastic elastomer as a solid filler, and the solid filler accounts for 30% of the mass of the finished composite material. % for batching, the calcium carbonate filler is evenly dispersed into the polyurethane thermoplastic elastomer by solvent kneading and mixing process, and then the solvent is driven off, and then the mixed polymer composite material is rolled into a thickness of 1.0mm sheet, the width of the sheet is controlled to 200-250mm. The density of the test flakes was 93.0% of the theoretical density.

[0021] Use a cutting mold to cut the pre-prepared sheet-shaped material into a disc with a diameter of 200mm, stack the discs together, and place them in the mold. When the thickness of the stack is controlled to 330mm, add a piece of thickness to one...

Embodiment 2-8

[0024] Using the same raw materials and molding process as in Example 1, the polyurethane thermoplastic elastomer with a softening point of 60-70°C is selected as the polymer binder, and aluminum oxide powder with a particle size of less than 200 μm is added to the polyurethane thermoplastic elastomer as a solid The filler is formulated according to the solid filler accounting for 30% of the mass percentage of the finished composite material. The calcium carbonate filler is evenly dispersed in the polyurethane thermoplastic elastomer by using the solvent kneading and mixing process, and then the solvent is driven off, and then the calendering process is used at 60 The mixed polymer composite material is calendered into sheets of different thicknesses at a temperature of ℃, and the width of the sheets is controlled to 200-250mm.

[0025] Using the same process as in Example 1 to fuse the sheet material into a block material, only changing the molding pressure for molding, the co...

Embodiment 9-16

[0029] Using the same raw materials and molding process as in Example 1, only changing the proportion of solid filler in the composite material and the heat preservation molding time of the block material, the density and mechanical properties of the block material prepared are shown in the table below.

[0030]

[0031] From the results of Examples 9-16, it can be seen that with the increase of the solid filler content in the prefabricated sheet, the tensile strength of the obtained bulk solid decreases slightly. The tensile strength and density decrease significantly with shortening of molding time. Using these parameters, a block composite material with a diameter of 200 mm and good comprehensive properties can be obtained.

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Abstract

The invention discloses a forming method of a large massive thermoplastic polymer composite material. Differing from traditional extrusion forming methods, the forming method is characterized by comprising the following steps: firstly preparing sheets from the thermoplastic polymer composite material containing solid fillers, then stacking the sheets together, raising the temperature and applying external force or coating a layer of solvent capable of dissolving the polymer material on the surface of each sheet material when adding each sheet material in the sheet material stacking process and removing the solvents after the stacked sheet materials are firmly bonded with each other, thus obtaining the large massive material. The massive material can be further processed to obtain the needed appearance and size. The forming method can be used for preparing larger massive polymer composite materials under lower pressures by adopting smaller equipment. The method is suitable for forming various thermoplastic polymer composite materials and has the effect of solving the problem that large massive materials can not be manufactured by small equipment.

Description

technical field [0001] The invention relates to a molding and processing method of polymer composite materials, in particular to a fusion molding method of large-size bulk thermoplastic polymer composite materials. Background technique [0002] There are many traditional polymer composite molding methods, but as the size of these materials increases, the equipment becomes larger and larger, the pressure required for molding is also higher, the energy consumption increases, the manufacturing difficulty increases significantly, and the overall manufacturing cost is large. increase in magnitude. In addition, as the size increases, the overall quality control of bulk materials becomes more difficult. For polymer composites containing a large amount of solid fillers, the uniformity of material dispersion and the stability of mechanical properties are more important quality requirements. For example, the typical screw extrusion process is used to prepare thermoplastic polymer co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C43/20B29C43/58
Inventor 蔺向阳郑文芳何敏郭伟尹雯
Owner NANJING UNIV OF SCI & TECH
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