Continuous batch preparation method of silicone rubber microfibers and microtubes

A silicone rubber, batch technology, applied in the direction of fiber chemical characteristics, tubular goods, rayon manufacturing, etc., can solve the problems of short length, unusable, long molding cycle, etc., to achieve controllable size and shape, broad application prospects, The effect of short molding cycle

Pending Publication Date: 2022-04-29
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the diameter of the microfiber or the inner and outer diameter of the microtube prepared by this preparation method is often large (millimeter level) and the length is short (centimeter level). When it is necessary to control microfibers or microtubes of different shapes and sizes, multiple sets of Complex mold, accompanied by problems such as difficulty in demoulding, long molding cycle and unfavorable industrial production
The continuous batch processing of silicone rubber into microfibers or microtubes is currently facing great challenges. This is because silicone rubber is a thermosetting elastomer, so it cannot melt and plasticize solid raw materials like thermoplastic elastomer materials (such as polyurethane) Fiber forming and cooling molding, nor can the general wet spinning method be used to dissolve the silicone rubber solid into an organic solvent and inject it into a coagulation bath for molding

Method used

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  • Continuous batch preparation method of silicone rubber microfibers and microtubes
  • Continuous batch preparation method of silicone rubber microfibers and microtubes
  • Continuous batch preparation method of silicone rubber microfibers and microtubes

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Embodiments of the present invention provide a continuous batch preparation method of silicone rubber microfibers, which comprises the following steps:

[0040] S1: According to the mass ratio of 10:1, mix the silicone rubber prepolymer and crosslinking agent evenly to obtain a mixed solution, pour it into a 20mL syringe, and vacuum degas for 0.1h;

[0041] S2: preparing a rapeseed oil bath at 80°C;

[0042] S3: Inject the silicone rubber mixture into the rapeseed oil bath in step S2 through a catheter and an 8G needle at a constant speed of 1mL / min using a syringe pump to mix the silicone rubber. The liquid flow of the liquid is rapidly heat-cured into fibers in a rapeseed oil bath, and the continuously formed fibers are guided by the guide wheel and collected by the winder at a linear speed of 3.0, 10.6, 26.4 and 60.3 m / min, respectively, and finally obtained Silicone rubber fibers with different diameters. Schematic diagram of the processing process of silicone rub...

Embodiment 2

[0045] Embodiments of the present invention provide a continuous batch preparation method of silicone rubber microfibers, which comprises the following steps:

[0046] S1: According to the mass ratio of 10:1, mix the silicone rubber prepolymer and crosslinking agent evenly to obtain a mixed solution, pour it into a 50mL syringe, and vacuum degas for 1h;

[0047] S2: Prepare an olive oil bath at 120°C;

[0048] S3: Use a syringe pump filled with the silicone rubber mixture in step S1 to inject the silicone rubber mixture through the catheter and a 14G needle into the olive oil in step S2 at a constant speed of 0.3, 0.8, 1.5, and 2 mL / min respectively In the bath, the liquid flow of the silicone rubber mixture is quickly heat-cured into fibers in the olive oil bath, and the continuously formed fibers are guided by the guide wheel and collected by the winder at a line speed of 10.0m / min, and finally the fibers with different diameter silicone rubber fibers.

[0049] The diamete...

Embodiment 3

[0051] Embodiments of the present invention provide a continuous batch preparation method of silicone rubber microfibers, which comprises the following steps:

[0052] S1: According to the mass ratio of 10:1, mix the silicone rubber prepolymer and crosslinking agent evenly to obtain a mixed solution, pour it into a 30mL syringe, and vacuum degas for 0.5h;

[0053] S2: Prepare a diesel bath at 150°C;

[0054] S3: Use the syringe with the silicone rubber mixture in step S1 to inject the silicone rubber mixture through the catheter and the slit-shaped needle, rectangular cross-section needle and triangular cross-section needle at a constant speed with a syringe pump into step S2 In the diesel bath, the liquid flow of the silicone rubber mixture is rapidly thermally solidified into fibers in the diesel bath, and the continuously formed fibers are guided by the guide wheel and collected by the winder at a linear speed of 15.0m / min. Silicone rubber fibers of different cross-section...

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Abstract

The invention provides a continuous batch preparation method of silicone rubber microfibers, which comprises the following steps: injecting an injector filled with a silicone rubber mixed solution into a hot oil bath at a constant speed through a catheter and a needle head by using an injection pump, thermally curing the mixed solution flowing out of the needle head into fibers in the hot oil bath, and collecting the fibers by a winder to finally obtain the silicone rubber fibers. The invention further provides a continuous batch preparation method of the silicone rubber microtube, two injectors are injected into a hot oil bath at a constant speed through a catheter and a coaxial needle head by using two injection pumps respectively, a silicone rubber mixed solution is injected into a skin layer of the coaxial needle head, and liquid oil is injected into a core layer of the coaxial needle head; a liquid flow flowing out of the coaxial needle head is thermally cured into a microtube in a hot oil bath; and extruding the liquid oil out and cleaning to finally obtain the silicone rubber microtube. The method is simple in technological process, free of special processing equipment, low in production cost, environmentally friendly and capable of achieving large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of thermosetting silicone rubber preparation, in particular to a continuous batch preparation method of silicone rubber microfibers and microtubes. Background technique [0002] Silicone rubber is a thermosetting silicone rubber material with excellent properties, wide application and general purpose. Silicone rubber has excellent optical transparency, excellent high and low temperature resistance (Tg≈-125°C), can maintain good elasticity at low temperature, can serve for a long time at 200°C, has good water resistance and Solvent resistance, excellent electrical insulation, good air permeability, good biocompatibility. In addition, the excellent properties of silicone rubber can be further enriched by chemically modifying the surface of silicone rubber or doping with various fillers in the silicone rubber matrix. The above-mentioned excellent comprehensive properties make silicone rubber widely used in op...

Claims

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Application Information

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IPC IPC(8): B29D23/00D01F6/94D01F1/10C08L83/04
CPCB29D23/001D01F6/94D01F1/10C08L83/04
Inventor 鲁从华李乐乐汪娟娟韩雪
Owner TIANJIN CHENGJIAN UNIV
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