Method for mixing polytetrafluoroethylene dispersion resin with high-proportion filler

A polytetrafluoroethylene and dispersing resin technology, which is applied in the field of polytetrafluoroethylene film manufacturing, can solve the problems of low uniformity of fillers, unformable and unformable calendered films, etc.

Pending Publication Date: 2021-01-22
江苏中际信通讯材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above mixing method is used in raw materials whose mass ratio of filler to polytetrafluoroethylene is greater than 2:5, and there are the following technical problems: the uniformity of filler in the molded product is low, the strength of the prepared polytetrafluoroethylene film is poor, and even There will be cases where the calendered film cannot be formed
The disadvantage is that single supersonic pulverization is continuous feeding. Although it can refine the super large filler particles, it cannot mix the filler particles and PTFE evenly, resulting in the strength caused by the low uniformity of the filler in the molded product at a high addition ratio. Poor, or even unformable cases

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  • Method for mixing polytetrafluoroethylene dispersion resin with high-proportion filler

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Mix 1.6kg of PTFE dispersion resin powder with 2.4kg of SiO 2 Put the powder into a three-dimensional mixer (model: SBH-20; mixing volume: 20L; spindle speed: 15r / min; motor power: 0.75Kw) and mix for 0.3h, and then use a negative pressure tube to suck the mixture into the supersonic jet milling equipment Inside, the feed rate is 1kg / h, and the ratio of the feed rate of the mixture to the maximum processing capacity of the supersonic airflow mill (YQ100-1 airflow mill) is 10%; the process parameters of the crushing equipment are: crushing pressure 0.6Mpa, supersonic jet velocity 400m / s, the pulverization time of the mixture in the supersonic airflow pulverization equipment is 6min, and the particle size of the new structure particles formed by the filler coating on the surface of the polytetrafluoroethylene particles in the discharge is 30~ 50μm;

[0029] The above-mentioned mixed material is transferred in the fluidized bed reactor (MQH-90L fluidized bed reactor), inj...

Embodiment 2

[0031] Mix 2kg of PTFE dispersion resin powder with 3kg of SiO 2 Put the powder into the three-dimensional mixer and mix for 0.3h, then use the negative pressure tube to suck the mixture into the supersonic jet milling equipment, the feeding speed is 5kg / h, the feeding speed of the mixture is the same as the maximum processing capacity of the supersonic jet milling equipment The ratio of the amount is 50%; the process parameters of the crushing equipment are: the crushing pressure is 0.6Mpa, the supersonic jet velocity is 400m / s, the crushing time of the mixture in the supersonic airflow crushing equipment is 6min, and the filler in the discharge is coated with The particle size of the new structure particles formed on the surface of PTFE particles is 80-110 μm;

[0032] The above-mentioned mixed material is transferred in the fluidized bed reactor, and the airflow is sprayed into the reactor inner cavity through the micropore at the bottom of the reactor. The feed rate of the...

Embodiment 3

[0034] Mix 2kg of PTFE dispersion resin powder with 3kg of SiO 2 Put the powder into the three-dimensional mixer and mix for 0.3h, then use the negative pressure tube to suck the mixture into the supersonic jet milling equipment. The feeding speed is 1kg / h. The ratio of the amount is 10%; the process parameters of the crushing equipment are: the crushing pressure is 0.8Mpa, the supersonic jet velocity is 500m / s, the crushing time of the mixture in the supersonic airflow crushing equipment is 6min, and the filler in the discharge is coated with The particle size of the new structure particles formed on the surface of PTFE particles is 10-30 μm;

[0035] The above-mentioned mixed material is transferred in the fluidized bed reactor, and the airflow is sprayed into the reactor inner cavity through the micropore at the bottom of the reactor. The feed rate of the S2 fluidized bed airflow mixing is 1kg / h, and the single mixing amount is 1kg. The air pressure in the fluidized bed is...

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Abstract

The invention discloses a method for mixing polytetrafluoroethylene dispersion resin with a high-proportion filler. The method comprises the following steps: S1, sucking a premixed polytetrafluoroethylene dispersion resin and filler mixture into supersonic jet milling equipment through a high-pressure gas negative pressure pipe, and sufficiently crushing and mixing; and S2, mixing the mixture obtained in the step S1 by adopting airflow of a fluidized bed mixer to obtain the polytetrafluoroethylene dispersion resin filler mixture blended with the extrusion aid. On the basis of existing supersonic speed crushing, a fluidized bed airflow mixing treatment step is added in the method for mixing the polytetrafluoroethylene dispersion resin with the high-proportion filler; compared with high-pressure, intermittent and short-time airflow mixing of pulse airflow mixing, the fluidized bed adopts high-pressure and low-flow airflow, and more uniform, continuous and efficient mixing can be realized. The invention further discloses a production method of the polytetrafluoroethylene product.

Description

technical field [0001] The invention relates to the technical field of manufacturing polytetrafluoroethylene film materials, in particular to a method for mixing polytetrafluoroethylene dispersion resin with a high proportion of fillers. Background technique [0002] The polytetrafluoroethylene membrane material is obtained by mixing polytetrafluoroethylene and filler, blending with extrusion aid, extruding, calendering, removing extrusion aid, and sintering. PTFE film has excellent properties: low dielectric constant, low dielectric loss, and small thermal expansion coefficient, which is very suitable for millimeter wave applications. With the rise of high-speed communication, the demand for polytetrafluoroethylene film material is increasing, and the existing conventional mixing method is as disclosed in CN104723567A: polytetrafluoroethylene resin and modified filler are mixed in a three-dimensional mixer uniform. The above mixing method is used in raw materials whose ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/20C08L27/18C08K3/36C08J5/18
CPCC08J3/203C08J5/18C08J2327/18C08K3/36C08K2201/005
Inventor 陈晓燕陈怡方
Owner 江苏中际信通讯材料有限公司
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