DE1569463A1 - Process for the production of hardenable molding compounds - Google Patents

Description

METHOD OF MANUFACTURING HARDBARS The present invention relates to a process for the production of curable molding compounds, more precisely to a process for the production of hardenable molding powders.

The known method for the production of curable molding compounds exists in carrying out the condensation of resinification components with the whole after Recipe required amount of filler.

The condensation process is carried out in the presence of the catalyst with the addition of other ingredients at a temperature of 65 to 85 ° C for 1.5 up to 2.5 hours with subsequent partial drying in vacuo, whereupon the Reaction mass is finally dried and crushed.

This method has the disadvantage that the thick dough-like formed by condensation of the resin with the whole amount of filler B8e inhibits the complete course of the condensation processes. In this case leave it The resin formation processes cannot control and regulate themselves, which leads to an unstable Quality manufacturable molding compounds leads. This procedure requires an essential Manual labor and cannot be automated and mechanized.

The other known method of making curable molding compounds consists in the fact that the incompletely dried still contains a substantial amount of water containing resin is mixed with fillers and other ingredients, then becomes the material is dried and crushed. This procedure also requires one essential Manual labor and a large consumption of resinifying agents.

The aim of the present invention is to eliminate the disadvantages mentioned.

The object of the invention was to develop a method that the molding compounds have improved physical-mechanical properties Making it possible to reduce the consumption of raw materials.

The stated object was achieved by adding the filler and other ingredients required according to recipe for the preparation of a molding compound Introduce partially condensed resin additives into the mixture in portions, the amount of these additives and the length of time before they are introduced by the The course of the condensation process of resinifying agents is determined.

The condensation process is ended when the last one is mixed in Filler @ortion together with other ingredients.

The resin obtained is plasticized and dried at the same time, preferably in a vacuum. The process described is carried out with good mixing, i.e. ensures the required (i'rad and the speed of the medium homogenization. This mixing in connection with plasticizing and simultaneous vacuum drying creates conditions for the course of mechanical processes.

The present process can be partially condensed by incorporation Resin agent, with calcium hydroxide plasticized tung waste then perform the procedure as instructed above.

The present method for the manufacture of molding compounds enables to reduce the consumption of resinifying agents, a whole series of physical @ mechanical ones To improve properties of manufacturable products and a continuous Perform the molding compound production process, creating the conditions for automation and mechanization of the manufacturing process.

Iu will have a better understanding of the invention for the knowledgeable The following example is an illustration of people.

Example 1.

Production of the molding compound based on phenol-formaldehyde resin.

Composition of the starting raw material (parts by weight): Phenol 100 Formaldehyde 45 ammonia 8 stearin 1.5 calcium stearate 1.5 nigresin 7 hexamethylenetetramine 0.10 wood flour 270.0 water 375.0 hyd / one fills in phenol and formaldehyde / Molar ratio of phenol to formaldehyde such as 1: 1.4 in the kettle in which the initial condensation in the presence of alkali catalysts at the temperature of 60 ° C for 15 minutes.

Half of the required amount of filling is then put into the kettle filled in, and the condensation process is carried out for 15 minutes at the temperature of 60 ° C, then finished for the following 15 minutes at 900c, in the high-speed mixing screw mixed on di. Uasse obtained in this way with leftover filling quantity, Plasticizers, aqueous hexamethylenetetramine solution and dyes, then will the mixture is fed into the mixing screw where it is mixed for 1 hour will.

The homogenized moist mass is in di. other screw machine where the condensation process of resin-forming starting materials with strong mixing, Rubbing through and simultaneous vacuum drying ends, and the finished molding compound is obtained.

In Table 1, the physical @ mechanical properties of the obtained molding compound indicated.

Table 1 Properties Units of measurement Characteristic values Flowability according to Rasohig a 160 water absorption g / dm2 0.1 specific notched impact strength kpcm / cm2 7ç1 Strength limit for static bending kp / cm2 708 Compressive strength kp / cm2 1930 hardness kp / cm2 30.3 Martens heat resistance ° C 129 Mean breakdown voltage kV / mm 16.5 Specific electrical @@@@@@@@@@@@@@@@@@@@@@ Ohm 9.0.1012 Specific electrical Volume resistance ohm.cm 2.1012 tensile strength kp / cm2 400 Example 2.

Production of the molding compound based on phenol-formaldehyde resin, the Contains the tung shell plasticized with calcium hydroxide, composition of the starting raw material (Parts by weight) r Tung bowl (converted to absolute dry weight) 110-150 Crystalline phenol 80-110 Technical formaldehyde (40%) 130-180 ammonia water (25%) 35-50 lime (converted to GaO) 3-5 wood flour (based on absolute dry weight converted) 110 "150 hexamethylenetetramine 11-15 stearin 2.5-3.5 igrosine (in the case of the black color) 8-9 water 220-260 The amount of Mix the previously ground tung bowl with the amount of water equal to the weight until it has a dough-like consistency and is left to swell for 2 hours. The spring mass mixed with milk of lime and allowed to plasticize for 24 hours.

The lasse obtained is introduced into the molten mixture, the phenol and half of the required amount of formaldehyde and according to the recipe Contains ammonia water and is kept at the temperature of 60 ° C for 15 minutes; the process is carried out at the same temperature for another 15 minutes.

The remaining amount of is then added to the reaction mixture Formaldehyde and ammonia water and @accepts the common condensation 15 min at the temperature of 60 ° C, and then the temperature is increased 85-90 ° C and conducts the condensation for 20 minutes.

For the production of molding compound, the reaction compound is mixed with wood flour, Hexamethylenetetramine solution, lubricants and dyes in high-speed mixers, and so on the mixture is brought into a combined twin-screw machine where operations the supplementary condensation and mechanical @ chemical processes at the same time Vacuum drying, as well as processes of plasticizing, dyeing and deep saturation of the filler with resins run off. The product obtained represents a uniform by colored a <se impregnated with resins, which form cylinders of 5 mm in diameter and 10 mm in length.

After cooling, the granulated product is ground and homogenized, whereupon the finished molding compound is obtained.

Table 2 shows the physical and mechanical properties the molding compound obtained in Example 2 is given.

TaÜello 2 properties units of measure characteristic flowability according to Raschig mm 120-1 Specific weight g / cm3 1.35-1, @ water absorption g / dm2 0.06-0.0 Specific Notch incidence count kp cm / cm2 7.0-1 strength limit with static 2 bending 2 Improvement of the press fair on the basis of phenolformaldehyde resin, that the with Kalzinchydr @@ yd Contains plasticized tung cake.

Composition of the starting raw material (parts by weight): Phenol 100 Formaldehyde 64 ammonia 8 lime GaO 8 tung cake 133 stearin 1 calcium stearate r nigresin 7 He @@ methylentetramin 6 Water 375 Wood flour 133 The molding compound is made according to the in Example 2 described methodology obtained.

Claims (4)

P A T E N T A N S P R Ü C H E: 1. Process for the production of molding compounds from condensable resinifying agents, fillers, catalysts, plasticizers, Dyes and other additives required according to the recipe through condensation, when heated with subsequent mixing and drying, d a d u r c b g e k it is not noted that the filler and others are used for the production of molding compounds Ingredients required according to the recipe are already partially condensed into the mixture Introduces the resin in portions, the amount and time period before introduction determined by the course conditions of the condensation reaction of resinifying agents will. 2. Process for the production of molding compounds according to Apsplruch 1, d a N o u r i n g e n i t i n e t, that tung waste that contains calcium hydroxide are plasticized, introduced into the mixture of partially condensed resinifying agents will. 3. A method for the production of molding compounds according to claim 1, d a d It is indicated that the condensation process was introduced the last serving of the filler along with other ingredients is ended. 4. Process for the production of molding compounds according to claims 1,2,3, d a d u r c c g e k 6 n n a e i c h n e t that the mixture of the resin with fillers and other ingredients with simultaneous drying, preferably plasticized in a vacuum will.