SU912739A1 - Polyvinyl chloride based injection moulding composition - Google Patents

Description

(5) POLIVIVILE CHLORIDE BASED COMPOSITION The invention relates to poly vinyl lichloride (PVC) based compositions that can be used to make injection molded articles. Various compositions for injection molding products based on polyvinyl chloride plastic are known, including crushed process waste and rejected products from thermoplastic PVC as a filler, as well as; PVC waste with fabric base 11. However, these compositions have low strength characteristics. The closest in technical essence to the present invention is the composition 2 based on PVC for injection molding, used in the manufacture of materials of general technical purpose and including, in wt.%: Polyvinyl chloride Dioctyl phthalate 10-30 Calcium stearate 0.51.5 FOR CASTING BY PRESSURE Stearic acid0.2 -0, 5. Epoxidized Soybean Oil1.0-2.0 Crushed Polychloroprene Vulcanizer 5-30 However, for a number of cases, the strength and hardness of the resulting composition is insufficient. The aim of the invention is to increase the strength and hardness. The goal is achieved by the fact that a polyvinyl chloride-based composition for injection molding comprising dioctyl phthalate, a stabilizer and a filler, contains co-precipitated barium and cadmium stearate and epoxy resin as a stabilizer; and additionally contains pigment in the following ratio of components, wt.%: Polyvinyl chloride35 ,, 4b Dioctyl phthalate. 32, 7 Crushed structured polyvinyl chloride with a content of 30 0 masD of gelfraction 5-30 Co-precipitated, barium and cadmium stearate 0.7-0.95 Epoxy 0.7-0.95 resin 0.7-0.9 Pigment The proposed composition contains the filler is the second raw material, production waste, in particular shoe, namely crushed structured polyvinyl chloride. In the manufacture of shoes made of PVC plastisols using the coagulant form, nickel forms are used that are made by electroplating. o In the manufacture of these forms, slags are used, which are shoe models, such as boots, the base of which is made of structured poly (vinyl chloride), and the outer layer is made of thermoplastic plasticized PVC. Structured PVC, which forms the basis of the slug, includes wt.%: Polyvinyl chloride resins 53-55, plasticizers (mainly dialkyl phthalates) 23-25, the setting agent is polymerized 1, butylene glycol dimethacrylate 17-t§, the balance stabilizer. The content of the gel fraction in structured PVC masD, limit swelling in dichloroethane 200 250 OBD for hours. As a binder, we offer the composition contains industrial plastics used in the manufacture of shoes by injection molding, also the material of the shells of defective plastisol shoes. As pigments, titanium dioxide, oxides of polyethylene metals and others can be used. The composition based on polyvinyl chloride plastic and crushed structured PVC is a gene material that contains in the form of a filler particles of PVC gel structure, which are deformed but not dissolved in the melt during injection molding, and stored as separate structured areas in the finished article-i The method of obtaining the proposed polyvinyl chloride composition includes pre-treatment of the filler, structured PVC, binder material - industrial plast ohms or thermoplastic shells of plastisol shoes heated to softening. The introduction of structured PVC crumbs directly into the whole mass of plastic without pretreatment leads to a deterioration of the technological properties of the material due to insufficient wetting and insufficiently strong adhesive bonding of the surface of the particles with the binder (plastic melt). Example 1. Whole sludge is fed to the crushing rolls with one smooth and another corrugated shaft and a friction of 1: 1, with a gap between the shafts of 1.5+. 0.5 mm. After double rolling with cooling of the shafts, the resulting material in the form of a discrete tape (pelt) is crushed on a knife crusher (Desma granulator) with a rotor speed of about 3000 rpm into a crumb with a particle size of 1.5 - 5 mm. The crumb is mixed with molded plastic at a mass ratio of 1: 1 and rolled on a mixing roller with a gap between the rolls of 1 mm at 100 ° C until a uniform material is obtained in the form of a continuous ribbon. The latter is cooled to natural temperature and crushed on a leather crusher. The crushed material is mixed with plastic at a mass ratio of I :, so that the content of the crumb of slugs in the casting composition is Thoms%, and from this mixture the taper glass is molded under pressure at 180 ° C using an Engel molding machine. Composition with binder - industrial plastic, mass: Resin PVC C-70 5.9 Dioctyl phthalate il,} Barium stearate and cadmium 0.9 Epoxy resin ED-6 0.9

Titanium dioxide (rutile) Q, S Pigment, 45

Crushed structured PCh containing 30kQ wt.% Gelfraction (crushed slugs) 10.0 Composition of structured PVC,

forming a base slug, wt .: A mixture of PVC resins (nipeon A-21, PVC E., PVC M-64 in the ratio (70: 9:: 21) St.S

A mixture of plasticizers (dioctyl phthalate, dibutyl phthalate, dioctyl adipate, epoxidized soybean oil in the ratio of kQ: 2S:: 30: 5) 2.35

Stabilizer 3.01 Crosslinking agent (polymerized 1,3-butylene glycol dimethacrylate) 18,10 Catalyst initiating crosslinking

polymer, tert-butyl perbenzoate.

Example 2. The process is carried out analogously to Example 1. Instead of the molded plastic, the material of the sheaths of branded plastisol footwear is taken as adhesives.

Example 3. The process is carried out analogously to example 1. The ground material is mixed with a binder at a mass ratio of t so that the content of the crumb of slugs of the molding composition is 5 wt.

The composition of the composition with a binder industrial molded plastic mas.

PVC resin

C-70 8,

Dioctifalat, 7

Bari stearate

and cadmium 0.95

Epoxy resin ED-6 0.95

Titanium dioxide (rutile) 0,7 Pigment Oh, "7 Shredded structured PVC (slacks) 5tO

. ..

Example 4, the process is carried out analogously to example 1. Ground

0 the material is mixed with the binder at a mass ratio of 3: 1, so is the content of the crumb of slugs in the molding composition on May 30 .. The composition of the composition with the binder is an industrial plastic molding, mash:

PVC resin

35.7

S-70

Dioctylph32, 2

lat

0

Bari stearate

0.7

and cadmium

Epoxy

ED-6 0.7 resin

Titanium dioxide

5 0.35

(.pytilJ

Iron pigment 0, 35 Oxide Crushed structured PVC (crushed slugs)

30.0

the table shows the physico-mechanical parameters of the proposed and known compositions.

The data presented in Toblitsa show that the proposed composition has higher, compared with the known composition, indicators of resistance to tearing and hardness and under hardness, its suitability for use in the manufacture of various injection molded articles, such as shoe parts, flower pots, containers, pallets and others, i.e. in cases where the product must have a certain strength and frame. The use of a filler made of structured PVC makes it possible, in addition to the scarce raw material, to solve the problem of utilization of industrial waste (slugs) and protect the environment from pollution using standard plant equipment.

Tear resistance, kg / cm

72

78

82

72

Claims (2)

DETAILED DESCRIPTION Composition based on polyvinyl chloride for injection molding, including dioctyl phthalate, stabilizer and filler, characterized in that, in order to increase strength and hardness, it contains, as a stabilizer, co-precipitated barium stearate and frame and epoxy resin as filler - crushed structured polyvinyl chloride with a content of 30 + 0 mAb of the gel fraction, and also additionally contains a pigment in the following ratio of com (Ponentov, Yas .: Polyvinyl chloride 35,, 46 Dioctyl phthalate 32,, 7 polyvinyl chloride containing 30 ° C masl of gelfraction 5-30 Co-precipitated barium stearate and cadmium 0.7-0.95 Epoxy resin 0.7-0.95 Pigment 0.7-0.9 Sources of information taken into account examination 1. The author's certificate of the USSR 84231, class C 08 L 27/06, 1973. 2. Authors certificate of the USSR 23124, cl. C 08 L 27/06, 1975 ootype).