Painted polyester composition

 

(57) Abstract:

Use: for the manufacture of products of complex configuration based on coated polyester compositions used, for example, in the automotive industry and processed by pressing, injection molding. Essence: the painted polyester composition contains 70 wt.h. 67%-aqueous solution polypropylenglycol in styrene; 30 wt.h. thermoplastic - a 33% aqueous solution of polystyrene in styrene; 1,5 wt.h. thickener; 2.0 wt.h. tetramethylbenzene; 4.0 wt.h. lubrication, 300 wt.h. inorganic filler, 2.0 to 5.0 wt.h. pigment and 3.0 wt.h. surfactants - -(Tris-2,4,6-ethylphenyl) phenyltriethoxysilane or W-(4-nonyl)phenyltriethoxysilane. Of the compositions molded product, which when cured have a homogeneous staining and low shrinkage. table 1.

The invention relates to a painted compositions based on unsaturated polyesters (NPEP), which are reinforced by various fillers, including glass, and otverzhdajutsja. The compositions are processed by injection molding and extrusion, and are used in the automotive industry, for manufacturing, for example, for heavy load cover C is x polyesters, contains a component that reduces the shrinkage of the products on the basis of the curable compositions, thermoplastic. Introduction thermoplastic reduces shrinkage to 0.04%. However, when the curing appears white due to uneven staining pigmented compositions.

Closest to the technical essence is painted polyester composition, comprising 67% solution polypropylenglycol in styrene, thermoplastic copolymer of vinyl acetate and maleic anhydride, a thickener, tert-butylbenzoate, a lubricant, an inorganic filler, a pigment and a surfactant. The composition is homogeneous painted, however, the formed products of complex configuration in dry condition is unsatisfactory values of shrinkage that is expressed in the appearance of cracks in the products. The maximum content of the filler may consist of up to 200 wt.h.

The purpose of the invention is to reduce shrinkage during curing the formed colored polyester compositions with a high content of inorganic filler.

This objective is achieved in that the coated polyester composition, comprising 67% solution polypropylenglycol in styrene, thermoplastic, zag as it contains thermoplastic 33% solution of polystyrene in styrene, and as surfactants - (Tris-2,4,6-ethylphenyl)- phenylpiracetam or(4 nonyl)-phenylpiracetam in the following ratio of the components of the composition, wt.h.:

67% solution

polypropylenglycol - maleinate in styrene 70 33% solution policy - Tirol in styrene 30 Thickener 1.5 Retributivist 2.0 Grease 4,0 Inorganic box - preserver 300 Pigment 2,0-5,0 Surfactant 3,0

Surfactant according to the invention facilitates the contact between the resin and filler; the reagent is added in an amount such that the viscosity of weight (it is advisable before adding fiberglass) has reached a minimum. Homogeneous mixing amount of the filler increases significantly to approximately 20 wt.%. This leads to shrinkage of the resin is compensated or precompensated, as in the three-dimensional mixing of the resin molecular component parts must be stapled around the filler and the resulting expansion of the polymer lattice after removal from the mold in the form of a finished molded product uniformly vitrified.

Up to the present time such a high content of filler could not be achieved only by hard work, the result appeared mechanical inhomogeneity.

Uniform, free from stains and flows staining of unsaturated polyester resins with thermoplastic up to the present time was impossible.

The invention is illustrated by the following examples.

P R I m e R 1. Painted black polyester composition is presented in table.1.

P R I m m e R 2 (painted white polyester composition).

When a formulation similar to example 1, make the following changes, presented in table.2.

Filler: dolomite (Ca-Mg carbonate), the average diameter of 7.5 μm, a specific surface area of 0.46 m2/,

Dye: 5 wt.h. rutile (TiO2); the average diameter of 0.3 μm, a density of 4.0 g/mm2the content of TiO292,5%.

Physico-mechanical properties of the composition are given in table.3.

From this mixture by way of a core-melt obtained is suction elbow for an internal combustion engine. Thanks to the small content of the filler material flows, if it is exposed to mechanical stress at elevated temperatures. Holes for screwing thus have to be equipped with gaskets. Holes svenciausios of the change of the size of the molded product, obtained in accordance with examples, were measured in plates with dimensions HH mm3when using the mold. The negative sign means "reduction" positive "stretching". Product sizing, % Comparative example -0,03 Example 1 +0.11 Example 2 +0,10

As shown, when using the invention, even when very large quantities of filler and applying a thermoplastic with low-shrink character is achieved is stretching, which so far has reached only with low-profile additives, with homogeneous staining was not.

Of finished product in accordance with example 2, using the technique of core-melt receive suction elbow. Its surface is homogeneous, Matt black, gloss and underlines the high quality of the plastic. Black paint evenly covers all components have been obtained. Only stronger pollution, oil drops, or the remnants of the combustion engine internal combustion engine generally clearly recognizable; a simple wiping with a cloth makes the surface shiny again.

Molded articles with a white coating, in accordance with example 2, are applied before the aircraft is supposed to have aesthetic appearance. It is particularly desired gloss evenly painted surface.

In accordance with example 2 was obtained a glass. The temperature of the pressing 150aboutWith the pressure of 250 bar. The resulting glass has a diameter of 74 mm (top) and 58 mm (bottom) and the height 93,5 mm and a wall thickness of 1.5 mm, Its surface is pure white and glossy, in this case not found inhomogeneity, which takes place in the form of strips of filler or resin in the formulations of known compositions. Hygienic appearance and properties make these pure white molded product is suitable, in particular, for goods of hygiene and coatings, for example, washing machines.

P R I m e R 3. When replacing surface-active reagent of examples 1 and 2, which is commercially available formulation is obtained by attaching

nC9HOC2HOOH

-(4-nonyl)-vinylpolysiloxane in equal wt. parts and with the same other components of the formulation as in examples 1 and 2, receive the same positive effect, which was received with omega-(Tris-2,4,6-ethylphenyl)-vinylpolysiloxane Tom. All dimension values, as well as a wonderful abrasivejet were almost identical obtained from molded products in accordance with the invention, proceedeth coated polyester compositions with a high content of inorganic filler.

PAINTED POLYESTER COMPOSITION, comprising 67% solution polypropylenglycol in styrene, thermoplastic, thickener, tert-butylbenzoate, a lubricant, an inorganic filler, a pigment and a surfactant, characterized in that, as a thermoplastic, it contains 33% solution of polystyrene in styrene, and as surface-active substance - - (Tris-2,4,6-ethylphenyl)phenyl polyethoxylated or (4 nonyl)-phenyl-polyethoxylated in the following ratio of the components of the composition, wt.h:

67% Solution polypropylenglycol in styrene 70

33% Solution of polystyrene in styrene 30

Thickener 1,5

Retributivist 2,0

Grease 4,0

Inorganic filler 300

The specified surfactant 3,0

Pigment 2,0 - 5,0

 

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