JPS59140024A - Impregnating machine - Google Patents

Abstract

PURPOSE:To obtain an impregnating machine to improve impregnability of a substance to be impregnated by liquid material by a method wherein air in base material and vapor in solvent are passed through an air substituting device and then the base material is impregnated with resin liquid. CONSTITUTION:An air substituting device 4 is arranged on resin liquid, and solvent vapor is supplied from a solvent vapor supply hole 8 and returned through a condenser 10. Base 1 is supplied from the slit 9 at the top of the air substituting device 4 and air is substituted for solvent vapor in the air substituting device and supplied directly into resin liquid 7 from the slit 9 at the bottom end to impregnate resin. The base is passed through the resin liquid 7 and then supplied into a drier 12 and dried there to obtain prepreg.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention belongs to the technical field for impregnating an object with a liquid. For example, the technical field to which the technology according to the present invention pertains includes a technology that includes a technology for impregnating a substrate with a liquid polymer. The technical feature of this invention is embodied in a so-called laminate manufacturing method. Hereinafter, the manufacturing technology for laminates will be mainly explained, but this does not mean that the technology of the present invention is limited to the field of laminate manufacturing technology.

[Background Art] Conventionally, in the production of decorative laminates manufactured using so-called laminates, laminate products, or melamine resin, which are used as electrically insulating substrates, the base material is impregnated with a resin solution and then dried. It includes the process of making prepreg.

The apparatus for impregnating a base material with a resin solution used in such a process either dips the base material, such as paper or cloth, in the resin solution as it is, or coats the base material with the resin solution. When a base material is dipped in a resin solution or a resin solution is applied to a base material, the air in the base material is trapped in the resin solution, and the resin solution is affected by the capillary penetration power determined by the pore size of the base material. It will only go in until the point where it balances out with the air pressure. The trapped air also causes a decline in the performance of products such as laminates.

In the production of laminates using phenolic resins, melamine resins, epoxy resins, polyester resins, polyimide resins, and other resins, the relationship between resin properties and laminate performance has been clarified. In order to improve the processing properties of laminates such as punchability, I/Rill processability, heat resistance such as soldering heat resistance, warpage, and electrical properties, we use high molecular weight resins and IJJ/FJ agents such as tung oil. degeneration has taken place. In such a case, the resin becomes highly viscous and impregnated into the base material becomes poor. Therefore, large amounts of organic solvents and surfactants have been used, but these methods have disadvantages of increasing costs and reducing the performance of the laminate. Therefore, there has been a demand for more effective impregnation means.

[Object of the Invention] The present invention has been made in view of the above circumstances, and an object thereof is to provide an impregnating device used for efficiently impregnating a solid material with a liquid material.

[Disclosure of the Invention] The present invention provides an air displacement device that replaces air in a base material with vapor of a solvent that is liquid at a rich temperature and has a relatively low vapor pressure before impregnating the base material with a resin solution. The purpose of the present invention is to provide a device that is characterized in that it is made to pass through. Hereinafter, description will be made based on drawings shown as examples.

FIG. 1 shows an embodiment of a so-called vertical device. In this figure, 1 is a roll of base material (for example, base paper), 2 is a guide roll, 3 is a base material, 4 is an air exchanger, 5 is a heating means, 6
is a tip pan as an impregnation means, '7 is a resin solution, and 8 is a tip pan as an impregnation means.
is a solvent vapor inlet, 9 is a slit, 10 is a cooler, 11
12 is a dryer, and 13 is a resin-impregnated base material roll.

In the device according to this embodiment, the air displacement device 4 is placed above the resin solution 7 by some mechanical means. A solvent vapor inlet 8 is provided at the lower end side of the air exchanger 4, through which solvent vapor is introduced. And the solvent vapor is removed from the air exchanger 4.
rise in the. Further, a cooler (condenser) 10 is disposed near the upper end of the air displacement device 4 and is connected to the air displacement device 4. The cooler 10 is equipped with a jacket, and is configured to cool with water, for example, and to reflux the solvent vapor. Base material 1 is Surin at the upper end of air displacement device 4]
-9, and as it descends through the air displacement device 4, the air therein is replaced with solvent vapor. The base material 1 is then directly introduced into the resin solution 7 through the slit 9 at the lower end, where it is impregnated with the resin. After passing through the resin solution 7, it is led into a dryer 12 and dried, becoming a so-called prepreg.

In contrast to the embodiment shown in FIG. 1 above, FIG. 2 shows an embodiment of a horizontal air displacement device 14. As shown in FIG. A roll coater 15 is used for impregnation with the resin solution 7, and a reservoir of the resin solution 16 is also provided on the roll coater 15 to ensure complete impregnation. The dryer 17 is of a cylindrical type. In short, air displacement device 4.14, supply means for resin solution 7, dryer 12.17
The selection of formats and their combinations are arbitrary.

FIG. 3 shows an embodiment of the folding type shown in FIGS. 1 and 2. This discloses a design for the purpose of recovering the solvent vapor refluxed in the air displacement device 18 without mixing it into the resin temperature 1&7 as much as possible. 20 is a solvent outlet;
A gradient device 9 is provided at the bottom of the air displacement device 18 and is inclined toward a solvent outlet 20 .

In addition, the air exchanger 4.14.18 has a center part of its main body as a space through which the base material 1 passes, a heating means 5 such as a jacket is provided around it, and a space near the outlet of the base material 1 (=j) is provided around it. The solvent vapor inlet is located near the inlet of the base material 1, and the exhaust air outlet is arranged through the cooler.The heating means 5 keeps the inside of the cooler at a constant temperature. This is to prevent the condensation of the solvent.By heating in this way, it becomes easier to replace the solvent with air.The heating means can be any type of electric steam heater or the like. You may use the one.

The base material treated with the air displacement device is subjected to impregnation with a resin solution, but the means for impregnating the resin solution is not limited in any way. For example, a dip method, a heavy cloth method, a spray method, etc. are used.

When using the apparatus according to the present invention as described above, the substrate 1 to be supplied may be, for example, paper, pulp, cloth such as cotton, linen, rayon, acedate, etc., nonwoven fabric such as crow, synthetic fiber, etc. is used. When these base materials 1 are dipped in the resin solution 7 or when the resin solution 7 is applied to the base material 1, the resin solution 7 penetrates due to the capillary phenomenon caused by the pore structure of the base material 1.

In this case, the capillary penetration force produced by the pore structure increases as the pore diameter becomes smaller. However, the smaller the pore size, the greater the penetration resistance and the more difficult it becomes to penetrate. Furthermore, the higher the viscosity of the resin solution 7, the more difficult it is to penetrate.

However, no matter how low the viscosity of the resin, when it is incorporated into the base material 1, the permeation stops at the point where the internal air pressure and capillary permeation force are balanced. In the impregnating apparatus of the present invention, the air in the substrate is replaced with the vapor of a liquid solvent at room temperature (preferably a solvent with a relatively low vapor pressure) using an air displacement device, and then the substrate is dipped or coated. In this case, the solvent vapor cools and condenses in the resin solution to be impregnated. Due to the condensation, the inside of the base material 1 becomes depressurized, and the impregnation is quickly carried out with the same effect as reduced pressure impregnation. In this case, the driving force for permeation is the sum of the reduced pressure due to steam condensation and the capillary permeation force due to capillary action. Resin-based + Al
Even if it penetrates into the inside, the vapor will condense one after another, so the base material 1
The pressure inside does not increase and it completely penetrates.

In this invention, liquids that are liquid at room temperature and preferably have low vapor pressure include water, alcohols such as methanol, ethanol, propatool, butanol, and amino alcohols, and ketones such as acetone, MEK, and MIBK. These include aromatic solvents such as , Hensen, luene, quinceline, phenol, and cresol, esters such as ethyl acetate and butyl acetate, and halogenated hydrocarbons.

The invention described above is mainly used when impregnating a base material with a resin solution, but in addition, gases contained in the object to be impregnated may prevent the liquid to be impregnated into the object. Applicable in all cases.

In addition, in the production of prepreg', which is the main use,
In principle, there are no restrictions on the type of resin or base material to which this invention can be applied. In addition, after impregnation, a so-called dryer is usually used in conjunction with the device to remove solvents, monomers, etc. that are components of the resin solution, or to accelerate the reaction of the resin. There are no restrictions.

Application of this invention has the effect of improving the properties of products that conventionally remained at low levels due to insufficient impregnation, or in cases where product properties have deteriorated due to poor impregnation. , the effect is that improvements in its characteristics can be realized. These properties include, for example, heat resistance, mechanical properties, and electrical properties. Also,
If there are circumstances where sufficient modification such as plasticization of the resin is not carried out due to poor impregnation, this restriction can be relaxed.
This has the effect of realizing more effective plasticization. Furthermore, in some cases, in order to achieve sufficient impregnation, it is possible to reduce the amount of solvent that has traditionally been used in large quantities, and various safety effects can also be achieved.

Although not described in detail below according to the examples, the impregnability was evaluated by measuring various performances that are correlated with this.

Example 1 30 parts of methanol was added to 100 parts (parts by weight, same hereinafter) of a resin obtained by reacting phenol and formaldehyde at a molar ratio of 1:1.3 using ammonia as a catalyst under reflux conditions for 3 hours. In addition, a resin solution for impregnation was prepared.

First, paper as a substrate to be impregnated was heated in methanol vapor to replace the air in the paper with methanol vapor. The paper was dipped into an impregnating resin solution. Next, it was dried in a hot air dryer until it became a suitable green varnish. Furthermore, this was laminated and press-molded according to a conventional method. The performance of the thus obtained laminate product was measured by a method determined by JIS and other standards.

Example 2 Using the same resin solution as in Example 1, the base paper was heated in heated steam, and after replacing the air in each with water vapor,
Dimp impregnated. This was dried in the same manner as in Example I.
Example 3 Molding and Performance Measurement A laminate was obtained in the same manner as in Example 1 except that methanol used in Example I was replaced with main tanol, and the performance was measured.

Example 4 The same procedure as in Example 1 was carried out except that phenol was used instead of methanol in Example 1.

Example 5 Bisphenol A type molecule 1E2000-3000
An epoxy resin having an epoxy equivalent of 1,000 to 2,000, m-phenylenediamine, and a curing accelerator are mixed into MEK.
The base paper was heated in MEK vapor to replace the air in the paper with M + v K vapor. This was impregnated, dried, laminated, and pressed under heat and pressure to form a laminate in the same manner as in Example I, and the performance was measured.

Example 6 A laminate was obtained in the same manner as in Example 5, except that toluene was used instead of MEK in Example 5, and the performance was measured.

Example 7 Diallyl phthalate and MEK were added and dissolved in a polyester resin consisting of propylene glycol, maleic acid, and isophthalic acid, and hendiyl peroxide was added thereto to prepare a resin solution for impregnation.

This was carried out in the same manner as in Example 5 to obtain a laminate and perform performance measurements.

Comparative Example I The resin solution of Example 1 was placed in a dip pan and impregnated in accordance with a conventional method, dried using a hot air drier until a suitable glynes was obtained, laminated and press-molded to obtain a laminate. The performance was measured in the same manner as in Example (2).

Comparative Example 2 A laminate was obtained in the same manner as Comparative Example 1 using the resin solution of Example 5, and performance measurements were performed.

Comparative Example 3 Using the resin solution of Example 7, a laminate was obtained in the same manner as Comparative Example 1, and the performance was measured.

Table 1 shows the performance of the laminates obtained in the above Examples and Comparative Examples.

1゜Effect of the Invention] This invention is an apparatus used for impregnating an object to be impregnated with a liquid substance, in which an air displacement device is disposed in front of the impregnating means, and air contained in the object to be impregnated is removed. Since it is characterized in that it is replaced with solvent vapor that is liquid at room temperature, the effect of improving the impregnating property of the liquid to the object to be impregnated was obtained.

[Brief explanation of drawings]

1, 2, and 3 are schematic diagrams of an impregnating apparatus according to an embodiment of the present invention. 1 is a base material roll (for example, base paper) 2 is a guide roll 3 is a base material 4 is an air exchanger 5 is a heating means 6 is a dip pan 7 is a resin solution 8 is a solvent vapor inlet 9 slit 10 is a cooler 11 is an exhaust port 12 is a dryer 13 is a resin-impregnated base material roll Patent applicant: Matsushita Electric Works Co., Ltd.

Claims (1)

[Claims] (1) A device used for impregnating a material to be impregnated with a liquid substance, in which an air displacement device is placed in front of the impregnating means, and the vapor of the solvent, which is liquid at room temperature, replaces the air in the material to be impregnated. An impregnating device characterized in that the impregnating device