DE1494341A1 - Plastic molding compound fillers - Google Patents

Description

Plastic pre # mass fillers The invention relates to a granular or powdery plastic molding compound, which is one of the thermosets used in cure the molds and use organic fibrous aggregates as fillers are mixed in flour or granulate form.

There are known plastic pre # masses, which are mainly made of phenolic or urea-formaldehyde and wood flour, the latter being a filler shows the parts pressed from it in a favorable specific weight and to give them very specific properties, just that Ensure wood or organically wood-like fibers.

Practice has shown that plastic pre # parts are made from molding compounds with such fillers are not sufficiently waterproof. Such plastic pre # parts swell, crack and be destroyed. That bad quality is upon it due to the fact that the water is taken up by the small wood flour particles and bring them to swell, whereby the destructive influence begins and advances from the pressed part surface from itis inner.

It is the object of the invention to provide a plastic pre # mass filler to produce according to a very specific process, which these destructive properties no longer has and with which you even have the water resistance in your hand appropriate setting and enrichment of the components during the process.

Such a process is of great practical interest and of great importance for the plastics processing industry, the advantages gets into the hand, which is extraordinarily good and stable price parts in large Hitherto unknown quality allowed for manufacture or manufacture.

D * s method according to the invention is based on the fact that the use coming wood or the fibrous aggregates by hoggers or other suitable ones Processing machines initially to very thin chips, about a thickness of 0.1 - 0.3 mlu, mainly comminuted along the grain will.

These chips are then dried and treated with urea and formaldehyde resin, or e.g. with phenol-formaldehyde resin, or other similar resins approximately, depending according to the basic materials, 40 - 66 ffi aqueous solution, or in the case of insolubility of the Resins a corresponding dispersion, with a hardener together as a condensation product, soaked and mixed well so that all chip surfaces are exposed and the dry chips greedily soak themselves up on all sides with resin. The proportion of e.g. Urea and formaldehyde resin should be based on the solid resin contained in the solution make up about 6 to 30% weight-wise of the wood content. Depending on what is required Depending on the end product, the mixture is made lean or fat. In certain circumstances this resin-wood chips mixture is dried again and then under action briquetted into fittings by pressure and heat. These fittings are useful possibly in an air-conditioned chamber of an aging, refining and tempering time of about up to 200 hours exposed or post-annealed, and daqn with hammer-beater or similar suitable mills or devices on the desired granulate or flour crushed.

Very even sieve fractions can still be produced from this product won which then with the powdery, curable plastic pre # mass in known Way, depending on the desired setting, be mixed proportionally and through moderate heating sets the desired moisture content without hardening to influence. In a known manner, paint can be added to the molding compound, or the Fillers can be colored. Leave similar granules or flours as fillers can also be produced from scrap parts from the chipboard molding industry.

The wood shavings-resin-mass-mixture can also be chosen as required Add proportions of the known water repellants depending on the instructions.

It is also possible to use the coarser filler granules with a hardener and a urea-formaldehyde resin or a similar solution or dispersion to be mixed and processed in a hot press or preformed in a cold press and then cure in a hot press.

It is also possible to use these fillers both with powdered Synthetic resins or those in the form of solutions or dispersions can be mixed, to be coated with decorative films in the same or a later operation and to conceal. The decorative films can be made of paper, textile, glass fiber fleece, metal mesh or metal foils and it can do this in a known manner Barrier and balance films can also be used.

There are many possible uses, whereby one can look at objects of daily use, Consumer goods, semi-finished products, finished parts for industry, but also well-designed ones Costume jewelery, in particular chains and pendants with graphic decorative films, thinks of the same buttons for women's dresses and coats, which may be the same fabric that the buttons are made of is used as decoration are intended or for the coats or dresses made from them. Analog can for example on women's handbags, which until now have been made of metallic fittings These plastic molding compounds are pressed with a suitable textile fabric lamination.

Because despite the two hardening of the Pre # mass, namely once the filler turns itself and the second time when the molded part is pressed, relatively cheap molding compound is involved, parts can be pressed from it, which one normally does not think of because of poor profitability, these in a pre # process. The quality of these Pre # masses is far superior the previously known chipboard molded parts. Furthermore, the density can also do a lot higher than the strength by increasing the specific pre # pressure the pressed parts increased significantly.

Claims (5)

P a t e n t a n s p r ü c h e: i) Plastic pre # mass fillers and processes for their production from wood or other organic fibrous aggregates, the granulate or powdery plastic molding compounds that can be hardened in flour or granulate form, So-called thermosetting plastics, which are added and which are colored in a known manner can, characterized in that the wood or other fibrous additives by so-called chippers or other suitable processing machines to very thin chips, about 0.1-0.3 mm thick, mainly along the grain crushed and dried, which with urea and formaldehyde resin or e.g. Phenol-formaldehyde resin or other similar resins, depending on the raw materials, 40 - 66% aqueous solution or, if the resins are insoluble, a corresponding one Dispersion, with a coagulation as a condensate product, depending on the quality of the End product will be soaked @, although the proportion of plastic as a feast of March of can make up about 6% up to 30% by weight of the filler content and this Chipboard-resin-mass-coating is then under action after the desired drying of pressure and short to briquette to suitable fittings, which are expedient after an aging, refining and fermentation time of about up to 200 hours be post-tempered, at hammer-beater or similar suitable mills or devices crushed to the desired granules or flour and then Desired sieve fractions are obtained, which hardenable with the powder Plastic molding compound in a known manner, proportionally depending on the desired setting be mixed and calibrate the desired moisture content by moderate heating adjusts without affecting the curing process, which means that the molding compound is ready for processing achieved. 2) Plastic pre # mass fillers and processes for their manufacture according to claim 1, characterized in that before the briquetting of the wood-chip-resin-mass mixture optionally still required proportions of the known water repellants depending on the regulation can be added. 3) Plastic pre # mass fillers and processes for their manufacture according to claim i, characterized in that instead of prefabricated briquettes also Scrap parts of chipboard moldings are comminuted to form suitable granules or flour can be, provided that they are the desired with the contained en binder content Fillers correspond proportionally to all condensation products. 4) Plastic pre # mass fillers and processes for their manufacture according to claim 1, characterized in that the fillers, in particular those in the form of coarser granules not with powdered plastics, but optionally also nii t urea-formaldehyde resins can be mixed, which then in one Processed in a hot press or preformed first in a cold press and then in a Hot press to be cured. 5) Plastic pre # mass fillers and processes for their manufacture according to claim a to 4, characterized in that molding compounds with fillers after he invention directly during pressing or in a second or third pressing operation with decorative films consisting of paper, textile, glass fiber fleece, metal mesh or Metal foils are laminated and for this purpose barrier and balance films in a known manner can also be used.