Plastic and nonmetallic article shaping or treating: processes – Carbonizing to form article – Agglomeration or accretion
Patent
1980-03-21
1982-12-21
Hoag, Willard E.
Plastic and nonmetallic article shaping or treating: processes
Carbonizing to form article
Agglomeration or accretion
264 451, 264129, 264232, B29C 2500, B29D 900
Patent
active
043648797
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a method of producing bodies of filled plastics material in accordance with the preamble of claim 1. The invention also relates to a product of this method.
Methods according to the preamble of claim 1 are already known, e.g. from German Offenlegungsschrift 19 08 549. An unsolved problem in methods of this type resides in preventing a leakage of the reaction (resin) substance until its final setting. It is possible to adjust the pot life of the reaction substance as short as desired, so that, in this case, the gelation in the molded article takes place more rapidly and does not leak, however, this measure would not be economical, because the reaction substance would gel prematurely in the respective container, in the vacuum chamber and in the intermediate lines; this makes the substance useless. On the other hand, in the case of a long pot life, the viscosity of the reaction substance is so low that significant losses result from leakage from the molded article. Also in the case of heating in a hardening furnace, the viscosity is initially lowered until a sufficient cross-linking occurs, so that additional reaction substance is lost which, in addition, contaminates the furnace. As a result, the properties of the bodies filled with plastics material, also called composite bodies, are impaired. For example, the tensile strength values of the above-mentioned German Offenlegungsschrift, without the aid of metal inserts, are below 20 N/mm.sup.2.
It is the object of the invention to avoid the above-mentioned disadvantages and to increase or at least maintain the mechanical strength, particularly the tensile strength, of composite bodies while simultaneously simplifying and reducing the cost of their production. Also, the bodies should have a minimum residual porosity and a minimum susceptibility to liquid media, such as acids, lyes, organic solvents and waste water.
In accordance with the invention, this object is met by the teaching of claim 1. Advantageous and/or further developments according to the invention can be found in the subclaims.
Only when the filler, the preliminary binder and the reaction substance are adjusted to one another with respect to quality and quantity, optimum properties of the composite body can be obtained, because the filler grains must reach a frictional and stable connection with the silane adhesion mediator, the preliminary binder and the reaction substance. The leakage losses are negligible because of the sealing of the molded article. In addition, the furnace is protected. Very long pot lives of the reaction substances to be processed can be chosen. Advantageously, a dust-free and inexpensive quartz sand of high quality can be used as filler. In any case, the preliminary binder may not be absorbed by the filler, because this would result in a loss of preliminary binder. However, the quartz grain surface should be well coated by the preliminary binder. The preliminary binder should preferably be cold-setting, so that no costs are incurred for heating. All of this benefits the quality of the final product as well as its economy.
The self-supporting and inherently stable molded article with open pores can be produced in various ways which are known per se. Moreover, the conventional and proven molding tools can be used. For example, the molded article can be produced by injecting the filler and the binder into the cavity of a molding tool by means of an air flow or an air blast. Through a chemically released setting process, the binder can harden rapidly, so that the molded article can be quickly removed from the molding tool which means that the coefficient of utilization of the molding tool is high. In such molded articles, a volumetric compression ratio of a minimum of 0.5 to up to 0.85 can be achieved without difficulty. In the case of a compression ratio of 0.8, the volume of the molded article is filled up to 80% with filler, so that now only the pore volume of 20% must be filled with the reaction resin material. Since the resin material is more expen
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Gut Karl
Schneider Haiko
Voegeli Marcel
Georg Fischer Aktiengesellschaft
Hoag Willard E.
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