DE2760035C2 - Process for making decorative emblems - Google Patents

Description

The invention relates to a method for producing decorative emblems by casting a plastic compound in a series of wells, which are surrounded by retaining walls, without overflowing and under Formation of a positive meniscus and allowing the plastic mass to harden to form a glass-like one Area.

Decorative badges and emblems are used extensively in a number of industries. In in the past, a colored glass mass was poured into a bronze substrate. The thereby obtained Glass-like glass enamel served to embellish the product and protect the decorative emblem against weather influences.

Later, instead of glass enamel, plastic coatings were used, such as protective varnishes according to the US patent 54,062. Similar methods are known from US Pat. Nos. 4,465,2931 119,30 75,249 and 3,114,597.

Casting resins in general are from "Kunststoff-Lexikon", 6th edition, Carl Hauser Verlag, 1975, pages 182 and 183 known. From US-PS 33 37 476, 33 91 101 and

45

50 polypropylene glycol with three
Hydroxyl groups per molecule
Polypropylene glycol with two
Hydroxyl groups per molecule
catalyst
Antioxidants
Ultraviolet absorbers
Surface active agent

77.57

100.00

The amount of the catalyst can range from 0.10 to 2.00, the amount of antioxidant can vary from 0.25 to 2.00, the amount of Ultraviolet light absorber can vary from 0.25 to 2.00 and the amount of surfactant can vary from 0.01 to 0.10.

The molecular weight of propylene glycol with three hydroxyl groups per molecule can be from 300 to 3000 and the molecular weight of the one with two hydroxyl groups per molecule can vary from 400 to 2000.

The other part, Part B, of the composition is made by reacting an aliphatic diisocyanate with a polyol prepared which is difunctional, trifunctional or tetrafunctional in nature to a Form prepolymer. The purpose of the prepolymer is to maintain viscosity and rate of reaction

to regulate part A with the diisocyanate part B. The di-, tri- and tetra-functional polyol is mixed with the Dwisocyanat and slowly heated one hour under a vacuum of 988.2 mbar at 90 ⁰ C and then cooled to room temperature, drawn off and packed. A typical recipe is the following:

part B

Polypropylene glycol with three
Hydroxyl groups per molecule
Diisocyanate

15.00 85.00

100.00

Part A
part B

44.50
55.50

100.00

10

The molecular weight of the triol can vary from 400 to 2000 and the diisocyanate is large Molecular weight range.

The catalyst can be any heavy metal compound from the group tin, lead, zinc, mercury, Be bismuth, cadmium or antimony. A suitable antioxidant that is a colorless compound results can be used. Ultraviolet absorbers that are soluble in polyol and clear in the final product, are suitable. The surfactant is a silicone compound.

Hexamethylene diisocyanate, xylene diisocyanate or cyclohexyl diisocyanate, for example, can be used as the aliphatic diisocyanate be used.

Parts A and B are mixed together in the appropriate proportion, degassed to Remove air bubbles and cast onto an emblem to form a clear, hard plastic material. Hardening can be accelerated by applying heat.

As a polypropylene glycol with two hydroxyl groups, for example, one with a molecular weight of 425 (calculated according to the hydroxyl number), a hydroxyl number of 265, a viscosity at 25 ° C of 0.075 Pas and a pH value of 6.5 and as a polypropylene glycol with a hydroxyl group each Molecule a polyether triol with a molecular weight of 425 (calculated according to the hydroxyl number), a Hydroxyl number of 398, a viscosity at 25 ° C. of 0.6 Pas and a pH of 6.5 can be used.

The two parts, part A and part B, are mixed together in the following proportions:

50

This is the preferred proportion, although the proportions range from 40 to 50% for Part A and can vary from 60 to 50% for Part B.

The resulting urethane compound is strong and clear and stable under sunlight and weathering.

When using chrome substrates, they are first carefully cleaned.

The aluminum substrates are sprayed with steam, cleaned by immersion, rinsed, deoxidized, rinsed, Bred to shine by dipping, rinsed, anodized, rinsed and dried so that the thickness of the anodized layer is 0.0076 to 0.0102 mm.

All parts are then treated with a suitable primer within 8 hours of the Cleaning time (chrome parts) or the anodizing time (Aluminum parts) primed. The thickness should be between 0.0051 and 0.0102 mm.

All parts that need painting are painted within a week after priming. Before painting, the parts are baked at a minimum of 93 ° C for 60 minutes. The parts are then colored by spraying.

The uncast material has the property of hardness without brittleness and withstands more violently Wear from strong detergents and shock. It can pass rigorous water and moisture tests, saIz- and withstand acid tests, hot temperature and cold temperature tests, and gas tests. So it's an excellent one Filling material for painted decoration parts.

The hardened material has a Shore D hardness of 80 to 85 and a specific weight of 1.06. the Component Part A has approximately a viscosity of 0375 Pss, although the viscosity is suitably from 0.3 to 1 Pas can vary, at 2 rpm, with a Brookfield No. 4 spindle at 25 ° C. The viscosity of the component Part B is at 0.5 Pas at 2 rpm, with a Bookfield spindle No. 4 at 25 ° C. The component Part A, for example, has a specific gravity of 1.05 and component Part B has a specific gravity of 1.07.

Again, the mixing ratio is 45 parts by weight of part A and 55 parts by weight of part B. That Mixing ratio is 1 part by volume for part A and 1 part by volume for part B. The volume tolerance should do not deviate from ± '/ 2 part. The gel time for the Mix is 2 minutes and 10 seconds, although the range at 66 ° C is 2 to 7 minutes. if If a high curvature is desired on the cast emblem, this can be up to at room temperature 93 ° C for a longer period.

The substrate must be free from moisture, grease, dust and other foreign matter. It must be complete be level and relatively flat. The component parts are carefully and in the mix and pour head thoroughly mixed together. The material should be mixed without entrapping air. if Air bubbles develop, the material should be degassed immediately. This is done by getting a good one Vacuum applies to the material, the vacuum is relieved, another vacuum is applied and this in turn relieved. The compound should be mixed, degassed and poured within the gel time mentioned above will.

The plastic material is clear and, when poured, increases the clarity of the decoration on the substrate, on which it was poured and enhances the details of the recessed and raised areas. the The surface of the molded plastic material has a slight curvature that marks the transition of the molded Plastic to the part on which it was cast improves regardless of whether the latter is made of a Metal, such as aluminum, or plastic. The plastic material can be of different colors colored, but you get excellent results even with the clear casting resin, which comes with contrasts with the decorative metal and the printing.

The inventive method leads to a lens effect that the aesthetic impression of the Emblems improved. In the drawing means

Fig! a perspective view of a casting apparatus for performing the method according to FIG Invention,

F i g. 2 to F i g. 7 vertical sections through various emblems produced according to the invention,

Fig. 8 is a vertical section of an overflow

a casting,

9 shows a vertical section of a casting without overflowing,

10 shows an illustration of an automobile emblem from the front;

F i g. Figure 11 is a vertical section of the emblem of Figure 10 showing one method of casting of the emblem and

FIG. 12 is a vertical section of the emblem of FIG F i g. 10 showing an alternative method of casting the emblem.

In Fig. 1, a casting apparatus generally designated 10 is shown. A vacuum line 12 is connected via lines 14 and 16 to degassing vessels 22 and 24 , respectively. A pair of ball valves 18 and 20 are inserted in lines 14 and 16 to ensure that air does not go back to the containers. Supply lines 30 and 26 with ball valves 32 and 28 therein lead component part A and component part B to containers 22 and 24, respectively. These can be stirred for the purpose of degassing.

The degassed material then flows downwardly through lines 34 and 36, through ball valves 38 and 40, through filters 42 and 44 and through metering devices into the mixing and pouring head 46, which is of conventional construction. Below the mixing and pouring head there is a moving conveying device 48 with which the mixing and pouring head 46 is timed. The conveyor carries the depressions 50. If a depression comes under the mix and pour head, the conveyor belt stops. A predetermined amount of the plastic compound is poured into it, and then the conveyor device or the conveyor belt moves the next recess into this position. The cast parts are moved further in burn-in zones. The parts are then cooled and removed.

In the F i g. 2 and 3 different constructions for the cast emblems are shown. F i g. 2 shows an emblem with a metal or plastic substrate 70. The substrate 70 with a base area 68 has retaining walls 60, a rounded upper edge and depressions 62 with protruding and recessed areas, as at 63, which can be decorated by hot stamping, painting or printing. After the wells are decorated, the molding compound is poured into the wells 62. The composition and molding technique are such that when a plane has been laid around the upper portions 66 , a greater amount of the plastic compound than the volume of the area defined by the depressions is used. That is, the casting forms a positive meniscus. The angle "Z" of the one tangent to the point where the edge of the plastic ends at part 66 can be less than -90 ° but not less than 30 °. The molded plastic can be any thickness, but is usually about 4 mm thick. It can also be pigmented to create a multi-colored emblem.

In Fig. 4, a metal or plastic frame 80 is provided with a recess with a flat base surface 84. A metal foil insert 88 0.025 to 0.25 mm thick is attached to the base 84 of the frame 80 with an adhesive 86. Colors or information are applied to the foil by planographic printing, silk screen printing or other methods commonly used for decorating metals. Images are embossed or raised in certain areas. The film can also be a plastic material, such as polyethylene terephthalate, and it can be flat, embossed or hammered.

After the film 88 is secured in the frame, a clear plastic coating 90 is poured onto the top of the film insert and adheres both to the film and to the retaining walls 82 of the frame 80.

ίο In Figure 4, a part 90 with angled surfaces 91 and 92 and beveled retaining walls 93 and 94 is shown. The casting has a flat upper surface 96 which slopes towards the edges 97 and 98 of the retaining walls 93 and 94.

Fig. 5 shows, by way of example, the casting of a non-horizontal surface. A part 99 is shown at an angle Cvergrößert stored out from the horizontal and has a planar recess surface 101 and retainer walls 100 and 105 perpendicular to the surface of the one hundred and first

The casting compound bulges out approximately at 102 and meets the top of the retaining wall 100 in the form of a positive meniscus. The surface of the plastic forms an inverse curve at 103 and approaches the top of the retaining wall 105 at 104 in the form of a negative meniscus.

In Figure 6 a hollow part 111 with a flat bottom 113 and retaining walls 112 is filled with a quantity of plastic material, the volume of which is greater than the volume of the cavity. The material has a flat surface 114 which slopes downward at 115. The material does not overflow as long as the surface 114 is not too high above the retaining walls and as long as the tip of the retaining wall 112 is defined with a radius of 0.05 to 2.5 mm at the upper end.

F i g. Figure 7 shows the formation of yet another emblem obtained using the composition and molding technique of the invention. A plastic or metal substrate 148 having a cavity with a flat bottom surface and a perpendicular peripheral wall is used. An injection molded plastic insert 150 is decorated by painting, printing, or hot stamping. It was then bonded to the substrate using a suitable adhesive 149. The molded plastic 142 was then poured into the cavity 151 such that the molded plastic seals or protects the decorated surface and anchors the insert 150 to the frame side walls of the cavity 151.

The plastic compound can be poured in such an amount that it is somewhat larger than the volume of the area delimited by the cavity if a plane has been placed on top of the rounded upper parts 151 . That is, the casting forms a positive meniscus. The angle Z, which defines a tangent to the point where the edge of the plastic ends at the part 151 , can be less than 90 °, but not less than 30 °.

8 and 9 explain the effectiveness of a vertical retaining wall compared to a rounded one Retaining wall.

In FIG. 8, a flat substrate part 153 has a rounded retaining wall 154 with a height X. Plastic is poured on at 155 and tends to flow over the upper end of the retaining wall at 156. F i g. 9 shows a flat surface 158 with a retaining wall 159 with a sharply defined radius at the upper end and a vertical wall 160 with the height

«Γ« of at least 1.5 mm. The casting compound 161 rises over the retaining wall and stop at 162, the top of the retaining wall 160. This explains how that Material creeps over a rounded surface. The same stuff stops and rises with training of a meniscus when it is held back by a sharply demarcated wall-like wall.

Figures 10 through 12 illustrate a typical automobile emblem made of metal, generally designated 170. It consists of a fastening device 171 for Attachment of the ornament to the hood of a car. Chrome plated sections 172 and 173 are after curved at the top and surround the central section. A support member 174 extends upwardly and supports one Frame 175 consisting of horizontal parts 176 and 177 and a pair of curved parts. The one from that The frame limited area has a cast insert and a number of figures 179 to 181 in it. The Fig. 11 12 and 12 show the ornament in FIG. 10 in cross section and explain two methods of training the Inlay. Figure 11 shows one-half of an insert 184 that has been injection molded, decorated, and in the position shown was ordered. Parts 176 and 177 have longitudinal parts 182 and 183 that are L-shaped in cross-section and fit into a peripheral recess, the horizontal sections of which are designated 185 and 186. The inner surface 187 of the liner has a series of raised areas 188, 189 and 190 (enlarged shown) that are punched, hot-stamped, painted on or printed with colors using the screen printing process, and decorative sections. These raised areas have the form of FIGS. 179 to 181 in FIG. 10. With the insert half 184 in place, the ornament and insert become horizontal stored, and the other half of the liner is poured into the resulting cup-like cavity, whereupon the casting is allowed to cool and harden. The cast mass adheres to the surface 187 of the The insert is formed by the screen casting process and thus anchors the two insert halves together and forms the full deposit. Since the casting sections are either clear or lightly colored, the figures are 179 to 181 are visible and seem unsupported, which creates a nice aesthetic impression.

F i g. 12 illustrates an alternative method of manufacture of the ornament of Fig. 10. The ornament will placed horizontally on the casting substrate 191, which consists of a material on which the casting compound is not adheres. The substrate mates with parts 176 and 177 at 192 and 194. On major surface 200 In the substrate 191 there is a series of depressions in which the decorative figures 1% to 198 which correspond to FIGS. 179 to 181 in FIG. The mass is then applied to the substrate surface 200 poured on, which may have been treated with a separating medium to prevent the Mass adhered to it. The material sticks to the inside of part 176 and 177 and forms a something negative meniscus and protrusions 193 and 195. The material is allowed to harden and cool, and that Ornament is then turned over and poured on the other side. So is the insert on the frame 175 anchored, and the figures, which can be made of metal or some other suitable substance, are embedded in it. Thus, the ornaments of FIGS. 11 and 12 appear alike to an observer, although various methods of making them have been used.

For this purpose 4 sheets of drawings

Claims (6)

Patent claims: 1. A method of making decorative emblems by pouring a plastic compound into a Series of wells surrounded by retaining walls without overflowing and forming a positive meniscus and allowing the plastic mass to harden to form a vitreous Revenge, characterized in that a mixture of 40 to is used as the plastic mass 50% by weight of a polyether polyol component and 60 to 50% by weight of a diisocyanate component used, which is cured to form a polyurethane. 2. The method according to claim I _1, characterized in that a mixture of an aliphatic diisocyanate and an? Olyätheariols is used as the plastic compound 3. The method according to claim 1 and 2, characterized in that there is a plastic compound as a The mixture uses a mixture of a polyether diol and a polyether polyol component as the polyether polyol component Polyether triols and also a catalyst, an antioxidant, an ultraviolet absorber and contains a small amount of a surfactant. 4. The method according to claim 3, characterized in that a mixture is used as the plastic mass used, which is a mixture of 19% by weight and polypropylene diol as the polyether polyol component 78% by weight polypropylene triol and also 1% catalyst, 1% antioxidant, 1% Contains ultraviolet absorber and 0.04% surfactant. 5. The method according to claim 1 to 4, characterized in that there is a plastic compound as a Mixture used as the diisocyanate component 85% by weight of aliphatic diisocyanate and Contains 15% by weight of polypropylenetriol. 6. The method according to claim 1 to S, characterized in that the plastic ^{compound is cured by heating part A to 66 0} C for 2 to 7 minutes. 33 93 243 special polyurethane compounds are known which are also known as casting resins, for example for sealing Pipelines, are usable. Such casting resins have so far not been used for the production of decorative ones Badges and emblems used The object on which the invention is based was now to create decorative items in a simple manner To get emblems with a special visual effect. The inventive method of the type mentioned is characterized in that as Plastic compound is a mixture of 40 to 50% by weight of a polyether polyol component and 60 to 50% by weight a diisocyanate component is used, which is cured to form a polyurethane. The recesses surrounded by retaining walls can be made of metal or plastic, preferably made of aluminum or chrome. Chrome parts are carefully cleaned and primed before casting while aluminum parts are anodized and primed before casting. The wells can molded, painted, printed or coated before placing the glass-like plastic in the cavity pours. The molded plastic, when hardened, gives a lens effect to each of the decorative emblems. The first component, Part A, which is the polyol part of the dual component system, becomes useful by mixing a difunctional, trifunctional and / or tetrafunctional polypropylene glycol, ie with two, three, four or more hydroxyl groups per molecule and addition of a suitable catalyst, surfactants and light and heat stabilizers such as ultraviolet absorbers and antioxidants, won. After the unification of the product at 988.2 vacuum is heated for 1 hour at 90 ⁰ C mbar, cooled to room temperature and packaged. A typical composition is the following: