DK153160B - EXTRADABLE GLASS FIBER-ARMED BUILDING BASIS OF A VINYL CHLORIDE OR VINYLIDE CHLORIDE POLYMER - Google Patents

Description

Patent No. 142,584 relates to an extrudable resin based on a homo- or copolymer of vinyl chloride or vinylidene chloride or of post-chlorinated polyvinyl chloride and containing mineral filler, fiberglass and lubricant. 100 parts by weight of polymer having a viscosity index of 50-180, determined according to ISO standard R174, contains: 10-60 parts by weight of mineral filler in which the mean diameter of the elementary particles is 0.05-50 µm, 1-5 parts by weight of at least one lubricant and 5- 40 parts by weight of glass fibers.

The glass fibers in said material are preferably 4-6 mm long.

This extrudable resin allows for the manufacture in a single operation of reinforced, homogeneous articles with a satisfactory appearance and excellent rigidity. Thus, this resin itself produces excellent results.

However, it has been found that in certain types of filling funnels for the extruders, the above materials are in some cases difficult to flow due to a tendency for entanglement of the glass fibers, resulting in a material in which the fibers are poorly distributed. This results in a lack of homogeneity which results in local deterioration of the mechanical properties of the transformed resin and a less favorable surface appearance.

It has now been found that this disadvantage can be remedied by incorporating glass balls in the product referred to in the main patent.

Addition of 5-25 parts by weight, preferably 10-20 parts by weight of glass balls with a diameter of 0.005-0.080 mm, preferably 0.010-0.050 mm, allows the recovery of a free flow, which gives the extruder a very regular filling. Furthermore, the mixture of glass fibers and glass balls in the molten vinyl resin provides better layering than the fibers alone. This results in a greater homogeneity of the mixture, leading to a smoother surface of the profiled articles made therefrom.

The glass fibers used may be solid or hollow and are preferably spherical. Preferably, spheres which have been greased on the surface are selected to enable an improvement of the adhesion to the vinyl resins. They are introduced into the mixture at the same time as the glass fibers, usually after mixing the other ingredients.

The invention is further illustrated by the following example.

EXAMPLE

A mixture of the composition given in the table below is prepared by mixing in a quick mixer polyvinyl chloride, modifiers, lubricants, stabilizers and mineral filler. Allow the temperature to rise to approx. 120 ° C. When the mixture has cooled to approx. 40 ° C is incorporated into a slow band mixer of fibers and glass balls.

The obtained mixture is extruded at 160-190 ° C in a single screw extruder with a diameter of 60 mm and a length of 1200 mm.

A tube with a diameter of 200 mm and a thickness of 2.6 mm is obtained by calibration under vacuum.

The composition of the mixture used to make the tube and the properties of this tube are given in the table below:

Polyvinyl chloride 100 (viscosity index 80 determined by ISO standard Ri74) "UGIKRALSE" (powdered copolymers 10 of acrylonitrile, butadiene and styrene); modifier "PLASTIFLOW A01" (copolymers of styrene 3 and high molecular weight acrylonitrile); modifier

Dibasic lead phospid 3

Dibasic lead stearate 1

Calcium Starat lr5

Hydroxystearic acid 1,2

Polyethylene wax 0.3

Calcium carbonate (average diameter 0 * 0005 mm) 15

Glass balls (mean diameter 0.025 mm) 10

Fiberglass (6 mm) 16

Surface appearance very smooth 2

Elastic modulus (kg / mm) 480

Vicat point below 5 kg (° C) 81

The particular technical effect is to obtain, as in Patent No. 142,584, a fiberglass reinforced final product with a smooth surface appearance. The improvement lies in a better distribution of the glass filler, which facilitates extrusion, while at the same time making it possible to obtain a final product with a very smooth surface and with excellent mechanical properties (modulus of elasticity).

Claims (2)

1. In the extrudable resin referred to in Patent No. 142,584 on the basis of a homo- or copolymer of vinyl chloride or vinylidene chloride or of post-chlorinated polyvinyl chloride and containing mineral filler, fiberglass and lubricating oil, 100 parts by weight of polymer contains 5-25 parts by weight of glass balls with a diameter of 0.005-0.080 mm. Plastic material according to claim 1, characterized in that it contains 10-20 parts by weight of glass balls with a diameter of 0.010 - 0.050 mm.