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Method for preparing polyester/nano calcium carbonate mixture

A nano-calcium carbonate and mixed material technology, which is applied in the field of polymer material preparation, can solve the problems of easy re-agglomeration of nanoparticles, small particle size of nano-calcium carbonate, large specific surface area, etc., so as to reduce the elongation at break and improve the breaking strength. and good modulus and flame retardancy

Inactive Publication Date: 2009-02-11
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the small particle size and large specific surface area of ​​nano-calcium carbonate, it is easy to agglomerate and affect its application. Therefore, it needs to be modified. At present, improving the dispersion of nano-calcium carbonate and strengthening the interface bonding is mainly done by using a high-speed mixer. Resin, nano-calcium carbonate and various modified additives are dry-mixed, only for one kind of mixing, and then the mixture is melt-extruded with twin-screws, cooled with a large amount of cooling water to form strips, and pelletized with a pelletizer , and then dry after granulation for subsequent processing, such as Chinese patent application numbers 03126909.5 and 200610034690.8
However, there are obviously disadvantages of high energy consumption, dust pollution, large investment in equipment, complicated process, and easy reunion of nanoparticles due to secondary melting of resin.

Method used

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  • Method for preparing polyester/nano calcium carbonate mixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 3.6 kg of nano-calcium carbonate, 0.072 kg of titanate coupling agent, and 0.17 kg of composite antioxidant B225 into a high-speed mixer to neutralize 102 kg of polyethylene terephthalate slices. The speed of the high-speed mixer is 2400 rpm, the heating power is 2KW, and the temperature of the system reaches 145°C after 20 minutes. All additives are evenly coated on the polyethylene terephthalate particles, and the heating and mixing are stopped. The mixture was spun into fibers with a screw spinning machine, and the properties of the fibers are shown in Table 1.

Embodiment 2

[0023] 4.5 kg of nano-calcium carbonate, 0.09 kg of titanate coupling agent, 0.52 kg of composite antioxidant B225, and 100 kg of polyethylene terephthalate were sliced. The speed of high-speed mixing is 2400 rpm, and the heating power is 2KW. After 20 minutes, the temperature of the system reaches 145°C. All additives are evenly coated on the polyethylene terephthalate particles, and the heating and mixing are stopped. The mixture was spun into fibers with a screw spinning machine, and the properties of the fibers are shown in Table 1.

Embodiment 3

[0025] 6 kg of nano-calcium carbonate, 0.12 kg of titanate coupling agent, 0.76 kg of composite antioxidant B225, and 95 kg of polyethylene terephthalate were sliced. The speed of high-speed mixing is 2400 rpm, and the heating power is 2KW. After 20 minutes, the temperature of the system reaches 145°C. All additives are evenly coated on the polyethylene terephthalate particles, and the heating and mixing are stopped. The mixture was spun into fibers with a screw spinning machine, and the properties of the fibers are shown in Table 1.

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Abstract

The invention relates to a preparation method for a mixed material of polyester / nanometer calcium carbonate, which includes the steps as follows: when polyester chips, nanometer calcium carbonate particles, a reactive monomer and other additives are mixed at a high speed in a high-speed mixing machine simultaneously, the temperature of a mixed system is raised to the temperature of 145 DEG C by utilizing a method of mixed heating or added heating to soften the polyester chips and to lead the nanometer calcium carbonate as well as the other additives to be uniformly stuck on the polyester chips; while no serious conglutination exists between the particles of the polyester chips. The mixed material of polyester / nanometer calcium carbonate prepared by the invention has excellent processing properties and can be used for manufacturing fibers, films or reinforced plastics used for weaving by melt blowing or melt spinning.

Description

technical field [0001] The invention belongs to the field of polymer material preparation, in particular to a preparation method of polyester / nanometer calcium carbonate mixture. Background technique [0002] Polyester is an excellent raw material for engineering plastics. It has good wear resistance, heat resistance and chemical resistance, and is widely used in the manufacture of fibers, films and plastic products. However, its low crystallization rate and notched impact brittleness limit its application as engineering structural materials. Polymer / inorganic particle composite material is a research hotspot in the field of materials in recent years. Its mechanical properties, toughness, heat resistance, dimensional stability and other properties are significantly improved compared with bulk polymers. In the modification of polyester, adding nano-carbonic acid Calcium is a more excellent method. Nano-calcium carbonate is currently the nano-material with the largest output ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/00C08K13/02C08J3/20C08K3/26
Inventor 王依民宣大胜倪建华曹玲玲刘术佳袁静
Owner DONGHUA UNIV
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