SI8711732A8 - Process for making metal coated basis material for conducting plates - Google Patents

Description

FIELD OF THE INVENTION

The invention falls within the field of processing 1 processing, closer to the field of production of translation fruits.

Technical problem

The technical problem is how to get a metal »coated base material from a continuous plate» in the production bar de

The state of the art

The metal-coated base material from the conductor plate is also produced discontinuously into floor-mounted »presses» screening »tailored fabrics made of layered materials that are supplied with a ternoreactive resin of 1 metal foil. Such a process is expensive and provides basic materials ea quality that changes within a single panel. Therefore, it has long been respected by the desire for continuous action.

The step towards continuity is illustrated by British Patent Application no. 21 08 427. It describes a process whereby in a press having two heating plates, the press is rotated discontinuously, such that a strip of cloth and copper foil introduced into the press during the screening process is always nlrue 1 being pressed according to the clock. The product of this process therefore consists of individual sections, the dimensions of which are limited by the dimension »of the heating plates and are interconnected by non-compressed ie. unusable sections. There is also a change in quality within an individual plate, ie, when the consumer selects homogeneous quality, it leads to large quantities of waste.

Description of growl technical problem with Running examples

The present invention is essentially the task of providing a continuous process for the production of basic material for conductive panels.

That the pre-heating without pressure of a strip of layered matter with a teraoactive resin system that allows the use of a suitable double-strip press 1 thereby continuously making qualitatively seamless metal-coated strips of base material is extraordinarily surprising, especially when considered hardened, ie. unreacted resin Inert and does not enter yarns in bonding 1 so that, by preheating the strips of layered matter, the curing reaction of the accelerated, already pre-cured resin system takes place further. The surprising effect for experts is particularly clear in the light of the above British application, as this recommends to accelerate the unbleached prior reaction, to cool the resin after application, and before sieving. to reserve the oo reaction capacity of the bonding resin between the individual layers during the pressing process. Given that this recommendation is made for resin which normally cures, i. which is not accelerated, 1 which has not previously been cured, appears to be a measure of the invention of resin heating as pure nonsense, which has already lost some of its reaction capacity by previous curing and whose reaction capacity is rapidly reduced due to the acceleration during heating. However, this recommendation of the prior art, a diametrically opposite measure of preheat, precisely enables the continuous fabrication of metal coated base material for conductive panels. As a result of the previous reaction, due to the preheating aid of the accelerated and hardened resin, the resin is activated for the next pressure reaction, so that a coupling occurs in the press itself.

The method according to the invention eliminates the discerned differences between the less valuable banded areas 1 of the high-grade middle parts of the individual plates in the discontinuous 111 in the above-described tactical procedure, so that the obtained base material has a uniformly high quality of 1 can be cut into hoogens of the same quality.

The mode of operation of the double-strip press is, for example, known in the manufacture of decorative laminates. Certainly, double-strap presses make vifi requirements for the process of the invention. The same applies to the dimensional stability and quality of the surface of the pre-filled product. Double-band presses of a suitable type are e.g. described in EP-Application 0026396 and oo264ol.

The individual layered materials to which the aiete thermoactive resins are added, are primarily run together in front of the double-band press area. -The £ pier system is already here, experimenting with pre-solidified ^ to state B. This primarily affects state B which is already advanced, ie. with less resin refinement than with ethereal hardening. The multilayer formation of layered matter is heated uniformly in the preheat zone, which is placed in front of the effective pressure zone. By lowering the viscosity, at which the resin becomes soft and plastic, equalization of the already existing unevenness occurs. The preheating temperature is dependent on the resin system; primarily it amounts to approx. 8o ° to loo ° C. From the preheating zone, a layer of layered matter aa about a loo ° C to the effective pressure zone, immediately merging with one 111 two, primarily preheated metal foils and letting them drop from 25 to 8o bar at increasing temperature to BC at 15oC to 21oC. Now, the recovered base material from the vite layers is then cooled down, primarily under pressure, especially with the maintenance of the compaction pressure, most preferably below the glass transition point of the resin, in which case it is further processed and cut. Pressurized cooling, ie. in the press it is suspected to be a high-quality stabilizing of the base material by a continuous process, in particular to avoid deformation.

As an accelerated, thermoactive resin system, epoxy resin, polyester resin, phenol resin, triacin and the like are generally considered. the epoxy-hardener-catalyst system is most suitable, as accelerators Among other suitable compounds are pyridine:

2- Benzolpyridine

3- Benzoylpyridine

4- bensoylpyridine

2- benzylpyridine

3- Benzylpyridine

4- benzylplrldine

2-benzylamino-pyrrolidine

4-dlmetllamlnoplrldln

2- methoxypyridine

4-tert-butylpyridine

3- cyanpyridine

2-hydroxypyridine

6-amino-2-pyridine

2- Aminopyridine

3- ethylpyridine

3-ethyl-4-methylpyridine

2- fenllplrldln

2.4- diamiplr idir.

3- methylpyridine

2- (amine »til) -pyridine

2-amino-4-ethylpyridine

2.4- dlmetllpirldic

Another group of suitable accelerators are known imidazole substituted compounds including imidazole itself, namely:

H-netllmldazole

2-methylimldazole

2-Phenylimidazole

4-phenyllimasol

4-Methylflidazole

2-Nethylbenzimidazole

5,6-dimethylbenzimidazole

1- Methyl-2- £ enylbenzi & idasol

1,2-dinetilladLdazole

4,5-di <enillmidazole

2-Ethyl-4-methyl »idazole carbonyldylaidazole lnidazole

2-undecillnidazole

1- Cyanoethyl-2-phenylimidazole

2- phenylbenziaidaeol ·

In particular, good results can be achieved with the combination of dicyandiandiand. benzyldylmethylamine with the aforementioned &apos; imidazollma. According to the invention, the tone is taken in addition to the acceleration of the acceleration than with the known mth systems, first of all, in order to achieve economical transient velocity in the press.

In the further essential advantage of the process of the invention, the following should be considered:

- optimum utilization when making the piece, since the continuous strip can be cut arbitrarily;

- material savings, since only two sides are required;

- energy savings, since the cooling process 1 is thus wasted, thus destroying the energy in the process;

- qualitative improvement of laminates, especially dimensional stability;

- reducing waste with a cleaner surface of copper foil to hold.

Claims (1)

- 6 Contrary to the discontinuous fabrication processes in so-called floor presses, significant savings of working phases are obtained, namely the cross-cutting of pre-impregnated fiberglass material to the length of the form, cross-cutting of the metal foil to the length of the pre-impregnated package of pre-impregnated fiberglass material, assembly laminate packets, tear down laminate packets, scrap expensive sheet metal for scrapping, and scrap pillow paper that can only be used once Jpodeans are operated with such a »dwell time in the heating zone, corresponding to a forward speed of approx. 3 m / nin. inside a double-strap press. Retention time or forward speeds depend on the curing temperature and the reaction rate of the resin-cured-accelerator system used. If only one-sided coated base material is made, instead of a metal foil, a permanent separation foil may be placed on a suitable spindle and fed into a double-band press instead of a metal foil. As a separation film, it can be glued to e.g. siliconized or polytetrafluoethyleneone »coated aluminum foil. After leaving the press, the separation foil can be folded down with a double strap to remove the finished strips of the base material and re-ground. Although the process according to the invention is shown on the basis of a 6-layer base material, the horns of the crop are understood to be made with other number of layers. The described operating conditions are primarily dependent on the resin system used and the cube to be changed accordingly. The method according to the invention can be applied for coating copper® or other metal foils. They are particularly suitable for coating with foil combinations, e.g. Cu / Al, as they are used for the finest conductive plates (so-called ^ etchible / etripable plates). The invention will be further illustrated by the following examples. Example 1 Such a woven fabric is, as it is commonly used in copper coated laminates, a glass fiber epoxy resin for conducting wafers with a weight of 2oo g / rn ^ soaked in a resin solution consisting of loo parts of polymer. of partially brominated bisphenol-A-glycidyl ether with a proportion of epoxidized novolac from 1 to 15%, preferably from 5 to 12%, 3.2 parts of dicyandiamide, o, 28 parts of 3-methylpyrrolidine and 8o parts of methylglycol. The so-soaked and at 165 ° C reduced prepreg had a resin content of 42% and a resin liquid lo%. Seven of these prepregs, after preheating to 8 ° C at a rising temperature of 15 ° C to 195 ° C, were pressed 45 bp continuously, proceeding through the apparatus to transfer the invention from 35 mm thick laminated copper foil on both sides to a 1.5 mm thick laminate. . The use of laminates is a result of unexpectedly positive results that were above average in dlmenmine stability of otherwise properties of equal value with conventional commercial laminates. The resulting laminate has a thickness tolerance of t 3 / loo. Comparisons 4. works for rigid laminates, the standards provide for a tolerance of 13 / loo, which is fully utilized by products from floor presses. Example 2 The glass fabric, as indicated in Example 1, was soaked in a resin solution consisting of loo parts of polymemic, partially brominated bispheno-A-glycidyl ether with a proportion of epoxidized Novolak from 1 to 15%, preferably from 5 to 12%, 3,4 parts of dicyandiamide, o, 33 parts 4-dimethylaminopyridine 1 8o parts »ethyl glycol. The so-soaked 1 at 17 ° C salts prepreg had a resin content of 44% 1 a liquid resin of 8%. The appearance of these prepregs was continuously continuous pressed after preheating to 85 ° C with a two-sided coating of 35, um copper foil at a rising temperature of 155 to 2oo C at a pressure of 5o bar on the apparatus according to the invention -8π laminate thick 1.5 nan. The laminate test also gave in this embodiment values that were above the standard in dimensional stability with otherwise comparable laminate properties to conventional commercial products®. " Example 3 With a resin mixture consisting of loo parts of a polymeric, partially brominated bisphenol-A-glycidyl ether with a proportion of epoxied Novolak from 1 to 15%, preferably from 5 to 12% with an epoxy equivalence by weight of between 35o to 52o, 3, o parts of dicyasdiamide, o, 4o parts of 2-amino-4-methylpyrrolidine and 8o parts of methylglycol na2 were melted loo g / m heavy glass fabric for the same purpose as prepared as in Example 1, and dried at 165 ° C. The resin content was 44% and the resin flow was lo%. Two of these carpets, after preheating to 8 ° C, were continuously pressed into a single sided 35 mm thick copper sheeting with a rising temperature of 15 ° C to 19 ° C at a pressure of 5 ° bar according to the invention. laminate. The test showed the same good results as in Example 2. 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