SU1705099A1 - Method of impregnating materials - Google Patents

Abstract

The invention relates to a technology for the liquid processing of a material and can be used in the manufacture of fibrous composite materials and products based on them and other purposes. The purpose of the invention is to intensify the impregnation process and increase its uniformity. By this, the chamber is filled with the impregnating medium to a predetermined level, immersing the material into it, followed by sealing, and vibrating the impregnating medium in the nonlinear resonance mode of the impregnating medium — gas. 1 il.

Description

The invention relates to the technology of liquid processing of materials and can be used in the manufacture of products from composite materials.

A known method of impregnating fibrous and porous materials, for example, tows, tapes, porous products, etc., by immersing them in an impregnating medium (polymeric binder, liquid metal, etc.) for a certain time.

The disadvantage of this method of drinking is the poor penetration of the impregnation medium into the deep water and into the shallow pores and channels between the voltages, because the impregnation rate is proportional to the square of the effective channel diomotra.

The closest in technical essence and the achieved result to the proposed method is the impregnation of materials, including filling the chamber with the impregnating medium to a predetermined level, immersing the impregnated material into it, followed by sealing, and vibrating the impregnated medium.

However, this method does not provide defect-free impregnation of small channels and pores.

The purpose of the invention is to intensify the impregnation process and increase its uniformity. i

The drawing shows a diagram of the device for implementing the Method.

A sequence of technological operations of the method is as follows. Izpeliya 1 is loaded into chamber 2, which is pre-filled with impregnating medium 3 to a certain level, and sealed with an upper flange t. Volume

f & xa

ate about

CD

FIRMS

void products; The preflice is icj. bHO experimental million by calculation; Camera 2 is fixed on none of Prospect 5 and under perga ;; there is no influence and mode of nonlinear resonance, the presence of which is determined with the aid of sensor 6 of dynamic and captive and recording device 1,

The filling of the chamber with the impregnating —prs-doy is carried out to the level determined from the ratio:

0.1 b (V

where v

V

V

0.25,

(one)

&

vn the volume of the gas cavity above the surface of the impregnating medium after immersing the material in it 4, the volume of voids of the material; V is the volume of the impregnating medium; Implementation of the impregnation of materials when a system oscillates into the chamber; impregnating medium — gas and non-linear resonance mode; spet, it is possible to obtain homogeneous impregnation of the smallest pores and channels due to the effective transfer of energy to local molecules in impregnated media the use of nonlinear capillary effects, as well as the enhancement of non-linear acoustic effects (cavitation, acoustic flows, etc.). In this case, the necessary condition for the excitation of a stable nonlinear resonance mode is the fulfillment of relation (1). The upper and the lower limits of this ratio are due to the dynamic stability of the vibrations and the nonlinear resonance mode of the impregnating medium - 3. Outside the limits of this ratio, maintaining the nonlinear reanance mode is almost impossible or is difficult. Resonant excitation system optic

1705099l

from o to factors the dimensions of the chamber, the density of the impregnating medium, and is characterized by the maximum hydrodynamic pressure p, the chamber. At the same time, the impregnating medium ––––––––––––––––––– –––––––––––––––––––––––––––––––––– system non-linear reso- Therefore, in order to reduce the time to reach the regime, it is necessary to reduce the viscosity by permissible methods, for example by heating the impregnation medium or adding solvents to it.

For example, when impregnating a carbon bundle of several hundred fibers of diesel 10

15

20

5 μm meter, wound on a spool with a winding thickness of about 30 mm HI and about 250 mm height, it penetrates evenly into the channels between the fibers and even into the voids between the individual 25 elements (fibrils) of the split fibers at a binder (thermosetting resin). The strength of samples of the material at the same time increased by an average of 10-20, compared with immersion impregnation, which confirms the effectiveness of this method.

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Claims (1)

Invention Formula The method of impregnation of materials, including filling the chamber with the impregnating medium to a predetermined level with the formation of a gas cavity, immersing the impregnated material about it with subsequent sealing and vibrating effect on the impregnating medium, which is different from the fact that, in order to intensify the impregnation process and increase its uniformity, the vibration effect is carried out in the nonlinear resonance mode of the system of the impregnating medium - gas. 5 µm meter, wound on a spool with a winding thickness of about 30 mm HI and about 250 mm height, it penetrates evenly into the channels between the fibers and even into the voids between the individual elements (fibrils) of the split fibers at a binder (thermosetting resin). The strength of samples of the material at the same time increased by an average of 10-20, compared with immersion impregnation, which confirms the effectiveness of this method. Invention Formula The method of impregnation of materials, including filling the chamber with the impregnating medium to a predetermined level with the formation of a gas cavity, immersing the impregnated material about it with subsequent sealing and vibrating effect on the impregnating medium, which is different from the fact that, in order to intensify the impregnation process and increase its uniformity, the vibration effect is carried out in the nonlinear resonance mode of the system of the impregnating medium - gas.