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Preparation method of modified monomer cast (MC) nylon 6 blending material

A nylon and blending technology, which is applied in the field of preparation of modified MC nylon 6 blending materials, can solve the problems of difficult removal of impurities, low added value, and reduced product performance.

Inactive Publication Date: 2012-03-28
李刚 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the price of special modifiers used for organic modification of MC nylon 6 is relatively high. People try to use very cheap recycled plastics as modifiers, but because recycled plastics contain a little impurities, these impurities are difficult to remove. , once added to MC nylon 6, it will result in lower product performance and unstable quality. Therefore, at present, most of the blended materials obtained by using recycled plastics as modifiers can only be used as low-value-added blended materials
So far, there are no open literature and research reports about modifying MC nylon 6 with recycled polyethylene

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] 1.1, heat 100kg of caprolactam monomer in a reaction vessel to 135°C to melt the material, and vacuum dehydrate to a vacuum degree of 10 -2 MPa, last 1-3 minutes, add 0.2kg sodium hydroxide, continue vacuum dehydration for 10-15 minutes;

[0017] 1.2, remove the vacuum, add 20kg of recycled polyethylene, 5kg of polyethylene-maleic anhydride graft copolymer, 1LKH550 and 20L of xylene swelling product into the above 1.1, raise the temperature to 145°C, stir, and make the recycled polyethylene in the caprolactam monomer Mix well in the melt until it is uniformly dispersed to obtain a uniformly dispersed recycled polyethylene / caprolactam monomer melt, then remove water and xylene in a vacuum, and the vacuum degree is 10 -2 MPa, last 10-15 minutes;

[0018] 1.3, quickly add 0.5L of TDI to the recycled polyethylene / caprolactam monomer mixed melt obtained in 1.2 above, mix quickly and evenly, cast into a mold that has been preheated to 160°C, keep it warm for 30min, and cool ...

Embodiment 2

[0021] 2.1, the same as 1.1 in Example 1.

[0022] 2.2, release the vacuum, add 30kg of recycled polyethylene, 6kg of polyethylene-maleic anhydride graft copolymer, 1LKH550 and 30L of xylene swelling product to the above 2.1, heat up to 145°C, stir, and make the recycled polyethylene in the caprolactam monomer Mix well in the melt until it is uniformly dispersed to obtain a uniformly dispersed recycled polyethylene / caprolactam monomer melt, then remove water and xylene in a vacuum, and the vacuum degree is 10 -2 MPa, last 10-15 minutes;

[0023] 2.3, 0.5 L of TDI was quickly added to the recovered polyethylene / caprolactam monomer mixed melt obtained in 2.2 above, and the subsequent steps were the same as 1.3 in Example 1.

[0024] The blended material prepared in this example is measured according to GB GB / T-1040-1992, and its tensile strength is 44.5MPa; measured according to GB / T-9341-2000, its flexural strength is 60.3MPa, and its flexural modulus of elasticity: 1.98 ×10 ...

Embodiment 3

[0026] 3.1, the same as 1.1 in Example 1.

[0027] 3.2, remove the vacuum, add 40kg of recycled polyethylene, 6kg of polyethylene-maleic anhydride graft copolymer, 1kg of polypropylene-maleic anhydride graft copolymer, 0.7L KH550, 0.3L KH550 and 40L of xylene swollen product to the above In 3.1, heat up to 145°C and stir to fully mix the recycled polyethylene in the caprolactam monomer melt until it is uniformly dispersed to obtain a uniformly dispersed recycled polyethylene / caprolactam monomer melt, and then remove water and xylene in a vacuum , vacuum to 10 -2 MPa, last 10-15 minutes;

[0028] 3.3, 0.5 L of MDI was quickly added to the recovered polyethylene / caprolactam monomer mixed melt obtained in 3.2 above, and the subsequent steps were the same as 1.3 in Example 1.

[0029] The blended material prepared in this example is measured according to GB GB / T-1040-1992, its tensile strength is 43.1MPa, measured according to GB / T-9341-2000, its flexural strength is 56.5MPa, an...

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Abstract

The invention discloses a preparation method of a modified monomer cast (MC) nylon 6 blending material. The MC nylon 6 blending material comprises the components by material ratio: 100 parts of caprolactam monomer, 20-40 parts of recycled polyethylene, 5-10 parts of compatibilizer, 20-40 parts of dimethylbenzene, 0.2-0.5 part of sodium hydroxide and 0.2-0.5 part of activating agent; the preparation method of the modified MC nylon 6 blending material comprises the steps of: heating the caprolactam monomer, melting, dehydrating the melted caprolactam monomer, and continuously dehydrating after the sodium hydroxide is added; then, adding the recycled polyethylene and the compatibilizer, stirring and leading the recycled polyethylene to be fully mixed in the caprolactam monomer melt until the recycled polyethylene is evenly dispersed; and finally, adding the activating agent, rapidly and evenly mixing, pouring the obtained mixture into a mould, and obtaining the recycled polyethylene / MC nylon 6 blending material. The recycled polyethylene is modifier, so that the production cost of the blending material is greatly reduced, and the blending material is not influenced by few impurities in the modifier; furthermore, the prepared blending material is very stable in performance and quality as well as higher in shock resistance.

Description

technical field [0001] The invention belongs to the technical field of in-situ polymerization modification of organic polymer compounds, and relates to a preparation method of a modified MC nylon 6 blend material. Background technique [0002] Monomer cast nylon 6 (MC nylon 6) products are widely used in chemical industry, machinery, petrochemical industry, electric power, Electronics, textiles and other fields, but due to the poor dimensional stability and low temperature toughness of MC nylon 6, its application range is limited. For this reason, people have carried out various studies on the modification of MC nylon 6, among which inorganic modification and organic modification are more concentrated. The main means of the inorganic modification method is to add one or more inorganic filler materials such as red phosphorus, glass microspheres, fibers, molybdenum dioxide, nanoparticles, etc. to MC nylon 6. The modified result makes the size of MC nylon 6 stable. Improved p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08L23/06C08L51/06C08K9/06C08K3/22C08G69/16
Inventor 许磊李刚陈立贵甘文辉
Owner 李刚
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