DE1694512C - Thermoplastic molding compound with chlorinated polyvinyl chloride as the main component - Google Patents

Description

With the molding compositions according to the invention can

formed even at low melting temperatures

30 objects are produced so that neither

The invention relates to thermoplastic form dyeings or pyrolysis to occur

masses of chlorinated polyvinyl chlorides and in particular the essential basis of the invention is once

special compositions with them, which are distinguished by discovery that there are cases in which the addition

good processability and high impact resistance - a suitable quantity, 3-butadiene to the above-

distinguish themselves. 35 mentioned admixture plastics an improved one

In general, plastics which give chlorinated processability and which contain polyvinyl chloride at the same time as a polyvinyl chloride are useful because they are associated with improved impact resistance.
they are heat-resistant up to 100 ° C or above and the invention has good tensile strength, a high inflammation temperature copolymer compositions, the temperature and a high resistance to chcmi- 40 result from an emulsion polymerization, such as shear decomposition. The use of these plastics in the following on the basis of ternary copolymers is, however, very limited because their relationship with 1,3-butadiene is described,
workability leaves much to be desired. Although they are in the copolymers, which are produced by other polymer melted state a relatively low viscosity sationsverfahren, z. B. mixed poly, they have the further disadvantage that 45 merisate compositions of monomers, the Styder melting point is high and that they contain rol, methyl methacrylate and 1,3-butadiene, due to thermal decomposition easily discolored. are so-called homogeneous copolymers. in the

In order to avoid a disintegration of the branched interpolymer during normal processing

To prevent settling and discoloration, the compositions must show the homogeneous mixed poly-

Working temperature of these polymers below 50 merisate when intimately mixed with chlorinated

the ideal flow temperature. Polyvinyl chloride and unsatisfied during processing

The disadvantages of processing are the basic features.

for a deterioration of many mechanical properties, it is also essential for the invention that the

Finished articles made from chlorinated interpolymer compositions also work well

Polyvinyl chlorides are produced. 55 chlorinated as a means of increasing the impact resistance For the production of improved molding compositions from polyvinyl chlorides are suitable.

chlorinated polyvinyl chlorides have already been chlorinated polyvinyl chlorides, which are inventively

seeks to use polymers with suitable admixability according to z. B. manufactured, in-

add, such as polyvinyl chloride, poly- to which powdered polyvinyl chloride under violent

vinylidene chloride, copolymers of styrene and 60 agitated uniformly suspended in water, and,

Acrylonitrile, or styrene and methyl methacrylate, learn while the polyvinyl chloride is in this state Copolymers of styrene, acrylonitrile and methyl remain and are exposed to light from the visible range.

methacrylate and chlorinated polyolefins. is shining. Chlorine passes through the water until one

These polymers have!, - yoke a low impact chlorine content of 60 to 67 percent by weight

strength or other disadvantages if you are enough at 65.

chlorinated polyvinyl chloride mixes or processes the best compositions with chlorinated

want. Polyvinyl chloride is obtained in the following manner.

The object of the invention is therefore thermoplastic. First, a mixture A consisting of 10 to is excited

60 parts by weight of styrene, 40 to 70 parts by weight of butadiene and 0 to 50 parts by weight of methyl methacrylate exists, for copolymerization. After a polymerization yield of at least 70% has been set, a mixture B consisting of 0 to 70 parts by weight of styrene, 30 to 100 parts by weight of methyl methacrylate and 0 to 10 parts by weight Butadiene, mixed uniformly with the copolymer from mixture A and the polymerization ended.

The copolymer composition produced in this way (here referred to as composition C) isi a so-called branched copolymer composition based on a radial reaction built up and created by emulsion polymerization in an aqueous medium.

A main property of Composition C is as follows: Though no decrease in viscosity in the molten state at the melting point of a mixture of this composition with polyvinyl chloride can be observed has a mixture of this composition C with chlorinated polyvinyl chloride a lower melting temperature and a lower viscosity in the molten state. In addition, the pyrolysis and discoloration almost completely disappear.

Furthermore, it has been found that the branched copolymer composition described is preferred from 5 to 30 parts by weight, while 70 to 95 parts by weight of the chlorinated polyvinyl chloride and that 10 to 20 parts by weight are optimally used. Are less than 5 parts by weight present, then the processability of the products is hardly improved, while with more than 30 parts by weight, the softening temperature of the products decreases sharply, so that they are molded are unsuitable.

The ratio A / B of the composition C, where A is the proportion from the mixture A and B is the proportion from mixture B has no very significant influence on the properties of the chlorinated polyvinyl chlorides. For producing moldings with good mechanical properties and good machinability are suitable e.g. B. A / B values of 2/1 to 1/5 in parts by weight, if you have 30 to 5 parts by weight of Composition C is mixed with 70 to 95 parts by weight of chlorinated polyvinyl chloride. All Quantities are based on weight.

To explain the invention, some exemplary embodiments are given below.

example 1

One part of powdered polyvinyl chloride with a degree of polymerization of IUOO is suspended in 5 parts of water. Chlorine is passed through the resulting suspension, which is ^{irradiated with a fluorescent lamp at a temperature of 50 °} C., at a constant flow rate. The reaction time is about 20 hours. The chlorinated substance is then carefully washed in an aqueous alkaline solution and then dried. The chlorine content is then around 65%. The substance obtained is denoted by D.

ίο Next is using. a mixture of 50 parts by weight Butadiene, 45 parts by weight of styrene and 5 parts by weight of methyl methacrylate according to the following Specification polymerized at 50 ° C for about 20 hours:

Water 4000g

Butadiene 1000 g

Styrene 900 g

Methyl methacrylate 100 g Sodium aurylate 40 g Sodium pyrophosphate 10 g Potassium persuiphate 10 g

The latex obtained in this way is designated A. Then the polymerization with the latex A continued according to the following rule:

Water 1000 g

LatexA 300g

Styrene 180 g

Methyl methacrylate 105 g

Butadiene 15 g

Sodium pyrophosphate 0.6 g Potassium persuiphate 3 g

The resulting polymer is denoted by C. The flow rate at the melting and softening point of a molded sheet is different for different ones Proportions of D and C entered in Table 1. It is checked by means of a test device according to »Kokashiki« (developed by the "High Molecular Chemistry Association" in Japan), with a pressure of 200 kg / cm * and a temperature of 190 "C are present.

The nozzle diameter is 1 mm, the total length 10 mm. The softening temperature becomes a 1 mm thick plate according to a Japanese standard test called »Japan Industrial Standards JIS K.-6745-1956 ".

table

sample D.
Chlorinated
Polyvinyl chloride C.
Branched
Mixed polymeri & at-
composition High speed
speed
(xlO »cm» / sec) Softening point
( ^J C) Comparative sample 1
number 1 100
95
90
80
70
60 0
5
10
20th
30th
40 0.54
0.7
1.6
5.0
8.0
10 100
100
96
90 No. 2 80
65 No. 3 No. 4 Comparative sample 2

Example 2

Composition C is prepared according to the instructions from Example 1, but with the compositions of components A and B modified in Table 2. The flow rates at the melting temperatures are determined as in Example I. The results are also summarized in Table 2. In all cases the ratio of D to C is 80:

Table 2

sample

Interpolymer Composition C

Latex A

(Butadiene / styrene / methyl methacrylate

Mixture B:

(Styrene / methyl methacrylate /!

Butadiene,

AWAY

Flow rate

(ν 10 = cm '/ sec)

Comparative sample 3

No. 5

No. 6

No. 7

No. 8

No. 3

Comparative sample 4.

No. 9

No. 10

No. 11

Comparative sample 5.
Comparative sample 6.

20/40/40 40/30/30 50/25/25 STl / 25/25 50/25/25 50/45/5 50/25/25 60/30/10 70/25/5 70/25/5 80/10/10 80/10/10 40/40/10 50/45/50/50 50/40/50/40/60/35/80/15/50/45/70/30 70/30 70/30 70/30

1/1 10.0 1/1 3.0 1/1 3.0 1/1 3.0 1/5 7.5 1/1 5.0 1/1 5.0

1/1 1/5

1/1 1/5

2.0

0.7

4.0

0.50

0.7

The notched impact values of the plate (according to C h o. R ρ y) can be found in Table 3.

Table 3

sample Impact value
according to Charpy
(kg cm / cm ²
at 20 ⁰ C) Comparative sample D
(chlorinated polyvinyl chloride) ....
Comparative sample 3
No. 5 5.0
3.5
6.5
10
10
5.5 No. 6 No. 7 No. 8

sample Key word
according to Charpy
(kg cm / cm ¹
at 20 ^u C) Comparative sample 4.
No. 9 5.0
15th No. 10 30th
10 No. 11 25th
7.5 Comparative sample 5
Comparative sample 6

Claims (2)

1 2 Molding compounds made from chlorinated polyvinyl chlorides that claim to be easy to process, have high impact resistance and discolour very little. Thermoplastic molding compound good processing- The subject of the invention is a thermoplastic availability and high impact resistance, consisting of 5 molding composition good processability and high impact resistance, consisting of 1. 70 to 95 parts by weight of a chlorinated polyvinyl chloride and ... _. 1. 70 to 95 parts by weight of a chlorinated poly 2. 5 to 30 parts by weight of a Mischpoiymeri- io vinyl chloride and sats off .... 2. 5 to 30 parts by weight of a copolymer A. one by emulsion copolymer _from
sation of 10 to 60 parts by weight of styrene, _t A. one by emulsion copolymerization 40 to 70 parts by weight of butadiene and 'of 0 to 50 parts by weight of methyl meth- 10 to 60 parts by weight of styrene, acrylate 40 to 70 parts by weight butadiene and obtained latex and 0 to 50 parts by weight of methyl methacrylate B. a monomer mixture obtained from ao latex and ™ u ^S im 5 ^ew ! ^c t ^tste ! | ^cn Sty ™ ". B. a mixture of monomers 30 to 100 _{parts by weight of methyl meth- 0 to 70 parts by} weight of styrene, nu-, «^ ·,. ·,?. ^Cry! ! · ^And 30 to 100 parts by weight of methyl methacrylate 0 to 10 parts by weight of butadiene. _unt j ²⁵ 0 to 10 parts by weight of butadiene.