Preparation method of anti-crystal-point film-grade nylon 6 slice

A slicing and film-level technology, applied in the field of preparation of anti-crystal point film grade nylon 6 slices, can solve the problems of prone to crystal points, unable to meet the needs of use, unable to adapt to deformation requirements, etc., to avoid crystal points and increase anti-oxidation. Performance, reasonable design effect

Pending Publication Date: 2022-03-04
JIANGSU HONGSHENG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the prior art film-grade nylon 6 slices are prone to crystal points when stretched, because the components of the prior

Method used

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preparation example Construction

[0017] A preparation method of anti-crystal point film-grade nylon 6 slices, the method comprising the following steps:

[0018] Step 1): heating caprolactam to melt, adding additives including end-capping agent and antioxidant, homogenizing the liquid, preheating at 90-150°C, the additive accounts for 4-6.5% of the total weight;

[0019] The end-capping agent is an amine-type end-capping agent, and the antioxidant is antioxidant 168.

[0020] The end-capping agent accounts for 5.5-6.8% by weight of the additive liquid, and the antioxidant accounts for 3.6-5.7% by weight of the additive liquid.

[0021] Step 2): The material obtained in step 1) is subjected to a cracking reaction, and the ring is opened at 215~240°C and 150~280kpa, and the polycondensation reaction is carried out at the same time;

[0022] Step 3): The material obtained in step 2) is subjected to a prepolymerization reaction, and the polycondensation reaction continues to occur at 240~270°C and 150~280kpa;

...

Embodiment 1

[0029] Step 1): Heat the caprolactam to melt, add additives including amine-type end-capping agent and antioxidant 168, homogenize the liquid and preheat to 90°C, the additive accounts for 4% of the total weight, and the amine-type end-capping agent accounts for the weight of the additive liquid Ratio of 5.5%, antioxidant 168 accounts for 3.6% of additive liquid weight ratio;

[0030] Step 2): The material obtained in step 1) is subjected to a cracking reaction, and the ring is opened at 215°C and 150kpa, and the polycondensation reaction is simultaneously performed;

[0031] Step 3): The material obtained in step 2) is subjected to a prepolymerization reaction, and polycondensation reaction continues to occur at 240° C. and 150 kpa;

[0032] Step 4): The material obtained in step 3) is subjected to a polymerization reaction, and the polycondensation reaction continues to occur at 280°C and -10kpa, and the film-forming stirring is carried out during the reaction, and the stirr...

Embodiment 2

[0038] Step 1): Heat the caprolactam to melt, add additives including amine-type end-capping agent and antioxidant 168, homogenize the liquid and preheat to 150°C, the additive accounts for 6.5% of the total weight, and the amine-type end-capping agent accounts for the weight of the additive liquid 6.8%, antioxidant 168 accounts for 5.7% by weight of the additive liquid;

[0039] Step 2): The material obtained in step 1) is subjected to a cracking reaction, and the ring is opened at 240°C and 280kpa, and the polycondensation reaction is simultaneously performed;

[0040] Step 3): The material obtained in step 2) is subjected to a prepolymerization reaction, and polycondensation reaction continues to occur at 270°C and 280kpa;

[0041] Step 4): The material obtained in step 3) is subjected to a polymerization reaction, and the polycondensation reaction continues to occur at 300°C and -50kpa, and the film-forming stirring is carried out during the reaction, and the stirring spee...

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PUM

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Abstract

The invention relates to a preparation method of an anti-crystal-point film-grade nylon 6 slice, which comprises the following steps: 1) heating caprolactam until the caprolactam is molten, adding an additive liquid containing an end-capping reagent and an antioxidant, homogenizing, and preheating; (2) carrying out ring opening and carrying out addition polycondensation reaction at the same time; 3) addition polycondensation reaction; (4) carrying out addition polycondensation reaction, and carrying out film-forming stirring during reaction; (5) filtering to remove polymers, carbides and gel, and then carrying out underwater pelletizing to obtain slices; 6) pre-extracting and extracting, and slicing and centrifugally dewatering after extracting; and 7) drying and cooling to obtain the film-grade nylon 6 slice. The method has the advantages that the end-capping reagent is added in the caprolactam polymerization process, so that the molecular weight can be controlled, and a crystal point caused by high-molecular-weight polymer formed by high-temperature re-polymerization in the downstream film forming process is avoided; and the antioxidant is also added, so that the antioxidant performance of the slice can be improved, and a crystal point caused by a reaction after oxygen enters a melt in a downstream film forming process is avoided. And crystal points are effectively prevented from appearing when the film-grade nylon 6 slices are stretched.

Description

technical field [0001] The invention relates to a method for preparing anti-crystal point film-grade nylon 6 slices. Background technique [0002] The nylon 6 film made of film-grade nylon 6 slices is biaxially stretched during the film-forming process, which strengthens the orientation of the molecular chain, increases the crystallinity, improves the mechanical properties, and the gloss and transparency and The gas-barrier liquid is improved accordingly, and the polymer molecules of the film are in a plane-oriented state. It has very good puncture resistance, rupture resistance, impact resistance, tensile strength, softness, cold resistance and heat resistance. It meets environmental protection requirements and is suitable for temperature Wide range, good electrical insulation performance, high surface gloss, good transparency; strong barrier to oil and gas, suitable for high-demand food packaging. [0003] However, crystal points are prone to appear in the prior art film-...

Claims

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Application Information

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IPC IPC(8): C08G69/16C08K5/526
CPCC08G69/16C08K5/526
Inventor 朱凉伟
Owner JIANGSU HONGSHENG NEW MATERIAL
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