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Title:
MULTILAYER PIPES OF RECYCLED MICRONIZED PVC AND PROCESS OF OBTAINING THE SAME
Document Type and Number:
WIPO Patent Application WO/2019/035728
Kind Code:
A4
Abstract:
The invention relates to micronized recycled PVC multilayer pipes obtained by the extrusion process which are formed of three layers, two of which are densely compact and are placed one on the inside, having a virgin PVC K 64-64 or micronized recycled PVC, the other on the outside of the pipe, having a virgin K-64-68 PVC composition, and a middle layer of lower density, expanded and having a micronized recycled PVC composition, these pipes are used in sewage installations, both inside and outside the buildings, and the invention also relates to the process of obtaining these pipes by extrusion, using manufacturing compositions with different compositions, a composition for the compact layer the density of which ranges between 1.45-1.9 g/cm3 and the other for the expanded layer whose density value is between 0.55-0.9 g/cm3. The compositions are made by means of metering devices for mixing the components, the mixed mixture of the proportions is introduced into the mixer, it is mixed up to a temperature of 110-130°C and then cooled to a temperature of 40-50°C in a cooler. Pipes may have different characteristics necessary and useful for their use, which, for example, but not limited to, -by the value of the flow - by the outer diameter and the annular rigidity - by the thickness of the walls. The admixture of PVC mass gives a thermal stability of PVC (virgin or micronized recycled), better machining, a reduction in pipe weight, a lower price due to reduced cost of raw material based on micronized recycled PVC and a positive impact on the environment by reintroducing micronized recycled PVC into compositions.

Inventors:
PETRI ZOSIN, Sergiu (Str. Andrei Mureşanu, nr. 30 ap 50,Bistrit, Jud. Bistrita Năsăud postal code 4, 42011, RO)
Application Number:
RO2018/000015
Publication Date:
May 16, 2019
Filing Date:
August 14, 2018
Export Citation:
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Assignee:
PETRI ZOSIN, Sergiu (Str. Andrei Mureşanu, nr. 30 ap 50,Bistrit, Jud. Bistrita Năsăud postal code 4, 42011, RO)
International Classes:
B29C48/00; B29C48/09; B29C48/18; B32B1/08; B29K27/06; B29K105/26
Attorney, Agent or Firm:
ANGHEL LUMINITA DOINA (Str. Gherghitei, Nr. 1 Bl. 94B,Sc. B, Ap. 76, Sector 2, Cod postal 1, Bucuresti, 02251, RO)
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Claims:
AMENDED CLAIMS

received by the International Bureau on 21 April 2019 (21 .04.2019)

Claim 1:

Multilayer PVC pipe with a micronized recycled PVC layer characterized in that is formed from three layers, of witch the middle layer is expanded with a smaller density and has components in the following proportions;

micronized recycled PVC with values between 65.8% - 88.4%, and

calcium carbonate with values between 4.5% - 21.8%, and

thermal stabilizer based on Ca-Zn with values between 2.2% - 3,3%, and processing modifier with values between 4,4% - 6,6%, and

azodicarbonamide with values between 0.2% - 0.4%, and

synthetic paraffin with values between 0.1% - 0.7%, and

high density polyethylene homopolymer oxide with values between 0.1% - 0.7%, and

polyethylene wax with values between 0.1% - 0.7%.

Claim 2:

Multilayer PVC pipe with a micronized recycled PVC layer according to claim 1 is characterized in that the density value of the middle layer is between 0.55 - 0.9 g/ccm.

Claim 3:

Multilayer PVC pipe with a micronized recycled PVC layer according to claim 1 is characterized in that the particle size value of the micronized recycled PVC is between 35- 1250 microns.

Claim 4:

Multilayer PVC pipe with a micronized recycled PVC layer according to claim 1 is characterized in that they have value of the outer diameter between ø110 - 0500, and

with a tolerance range from 0.3 - 0.9 mm, and a rigidity class between 2 - 12 KPa, and

a wall thickness between 2,2 - 16.5 mm, and

with a tolerance range from 0.3 - 1.7 mm,

Claim 5 :

Multilayer PVC pipe with a micronized recycled PVC layer according to claim 1 is characterized in that the K-value of the PVC in the micronized recycled PVC is between 60,5-68.

Claim 6 :

Multilayer PVC pipe with a micronized recycled PVC layer according to claim 1 is characterized in that the value of Shore D hardness for micronized recycled PVC is between 70° - 95° ShD.

Claim 7 :

Multilayer PVC pipe with a micronized recycled PVC layer according to claim 1 is characterized in that the value of ash content in the chemical composition of the micronized recycled PVC layer is between 5% - 45%.

Claim 8 ;

Multilayer PVC pipe with a micronized recycled PVC layer according to claim 1 is characterized in that the relative viscosity value of the processing modifier is between 10-16 ml/g.

Claim 9 :

Multilayer PVC pipe with a micronized recycled PVC layer according to claim 1 is characterized in that the value of the average size (D50) of the calcium carbonate particles is between 2-5 μιη.