阅读说明：本技术 具有高耐磨损性的管道 (Pipe with high abrasion resistance ) 是由 D·B·邢 石洪涛 郭锴 刘西强 万东 M·索利曼 于 2019-01-15 设计创作，主要内容包括：一种具有最内层的管道形或管形制品,其中所述最内层具有0.001至100mm的厚度并且包含聚烯烃组合物,所述聚烯烃组合物包含：a)丙烯-乙烯共聚物,其中衍生自乙烯的重复单元的量为基于所述丙烯-乙烯共聚物的重量计1至20重量％,并且其中所述丙烯-乙烯共聚物具有由ASTM D1505测定的至多0.9g/cm<Sup>3</Sup>的密度,和b)烯烃聚合物,其选自高密度聚乙烯(HDPE)、线型低密度聚乙烯(LLDPE)、聚丙烯(PP)和它们的组合。(A tubular or tubular article having an innermost layer, wherein the innermost layer has a thickness of from 0.001 to 100mm and comprises a polyolefin composition comprising: a) a propylene-ethylene copolymer wherein the amount of repeat units derived from ethylene is from 1 to 20 weight percent based on the weight of the propylene-ethylene copolymer and wherein the propylene-ethylene copolymer has at most 0.9g/cm as determined by ASTM D1505 3 And b) an olefin polymer selected from the group consisting of High Density Polyethylene (HDPE), Linear Low Density Polyethylene (LLDPE), polypropylene (PP), and combinations thereof.)

1. A tubular or tubular article having an innermost layer, wherein the innermost layer has a thickness of from 0.001 to 100mm and comprises a polyolefin composition comprising:

a) a propylene-ethylene copolymer wherein the amount of repeat units derived from ethylene is from 1 to 20 weight percent based on the weight of the propylene-ethylene copolymer and wherein the propylene-ethylene copolymer has at most 0.9g/cm as determined by ASTM D1505³A density of (A), and

b) an olefin polymer selected from the group consisting of High Density Polyethylene (HDPE), Linear Low Density Polyethylene (LLDPE), polypropylene (PP), and combinations thereof.

2. The article according to claim 1, wherein the amount of the propylene-ethylene copolymer a) is from ≥ 40 to ≤ 90 wt. -%, preferably from ≥ 50 to ≤ 90 wt. -%, based on the total amount of the propylene-ethylene copolymer a) and the olefin polymer b).

3. The article of any one of the preceding claims, wherein the polyolefin composition has a tensile stress of at least 10MPa and/or an elongation at break of at least 430% measured according to ASTM D638.

4. The article of any one of the preceding claims, wherein the polyolefin composition has an abrasion weight loss of at least less than 2%, at least less than 1%, at least less than 0.8%.

5. The article of any one of the preceding claims, wherein the polyolefin composition has a vicat temperature of at least 40 ℃, preferably at least 44 ℃, measured according to ASTM D1525(10N/50 ℃/hr).

6. The article of any one of the preceding claims, wherein the amount of repeat units derived from ethylene in the propylene-ethylene copolymer a) is at least 3 wt. -%, at least 5 wt. -%, at least 10 wt. -%, at least 15 wt. -% or at most 19 wt. -%, preferably at most 18 wt. -%, based on the weight of the copolymer.

7. The article according to any of the preceding claims, wherein the propylene-ethylene copolymer a) has ≥ 0.80g/cm, as determined by ASTM D1505³To less than or equal to 0.90g/cm³Preferably not less than 0.85g/cm³To less than or equal to 0.89g/cm³And/or a density of

Wherein the propylene-ethylene copolymer a) has an MFI of at least ≥ 1.2g/10min and at most ≤ 21g/10min, preferably at most ≤ 15g/10min, preferably at most ≤ 10g/10min, preferably at most ≤ 5g/10min, measured according to D1238 at 190 ℃ under a load of 2.16 kg.

8. The article of any one of the preceding claims, wherein

The HDPE has a density of 0.940 to 0.970g/cm measured according to ISO1183³And/or a melt flow rate of 0.03 to 40g/10min measured according to ISO1133 at 190 ℃ and under a load of 21.6kg, and/or

Wherein the LLDPE has a weight average molecular weight of 0.900 to 0.948g/cm measured according to ASTM D1505³And/or a melt flow rate of 0.03 to 30g/10min measured at 190 ℃ under a load of 2.16kg according to astm d1238, and/or

Wherein the PP has a melt flow rate of 0.01 to 200g/10min measured at 230 ℃ and under a load of 2.16kg according to ASTM D1238.

9. The article of any one of the preceding claims, wherein the article has an outer diameter of 2.5 to 255cm and/or an inner diameter of 2 to 250cm, and/or wherein the article has one or more layers, having a total layer thickness of 0.3 to 100 mm.

10. The article of any of the preceding claims wherein the total weight of the propylene-ethylene copolymer a) and the olefin polymer b) is at least 90 wt% of the total composition.

11. The article of any of the preceding claims, wherein the article comprises a layer comprising a polyolefin, and wherein the layer is adjacent to the innermost layer.

12. The article of any one of the preceding claims, wherein the article comprises a layer comprising high density polyethylene, and wherein the layer is adjacent to the innermost layer.

13. Pipe extrusion manufacturing process to obtain an article according to any one of the preceding claims.

14. Use of an article according to any of claims 1-12 for transporting an abrasive solid or slurry solution by passing said solid or slurry solution through said article.

15. Use of the article according to claim 14 in mining applications.

Examples

1. Test method

a) Density of

The density was measured according to the standards mentioned in table 1.

b) Melt Flow Rate (MFR)

MFR was measured according to the criteria mentioned in table 1.

c1) Wear resistance of component 1

The abrasion resistance was measured according to ISO15527: 2007. For the test, a circular sample having a hole in the inside and having dimensions of 4mm in thickness, 30mm in outer diameter and 8mm in inner diameter was prepared. The test was carried out on the MSH model of zhanjiakohua kehua tester ltd. The sample plate was rotated at 673r/min for 7 h. After the test, the sample was washed with water and ultrasonic waves for 30min, and then dried at 50 ℃ for 4 h. The weight of the sample before and after the test was recorded.

The percent weight loss provided was calculated using the formula:

abrasion weight loss ═ ((sample weight before test-sample weight after test)/sample weight before test) × 100%.

c2) Wear resistance of the component 2

The abrasion resistance was measured according to ISO15527: 2010. For the test, a rectangular sample with two small holes (diameter 10.5 and 4mm) inside and a size of 76.2 × 25.4 × 6.35mm was prepared. The TEST was carried out on a JJFLT apparatus manufactured by JJ TEST. The sample plate was rotated at 1200r/min for 7h, the slurry temperature was below 23 ℃. After the test, the sample was washed with water and ultrasonic waves for 30min, and then dried at 50 ℃ for 4 h. The weight of the sample before and after the test was recorded.

The percent weight loss provided was calculated using the formula:

abrasion weight loss ═ ((sample weight before test-sample weight after test)/sample weight before test) × 100%.

d) Tensile test

The tensile test is measured at a test speed of 50mm/min according to ASTM D638-14 (Standard test method for tensile Properties of plastics). A type I test bar having dimensions of 57.00X 13.00X 3.18X 166mm was used. Five bars were tested for each sample and the average value reported.

e) Vicat temperature

Vicat temperature was measured according to ASTM D1525, 10N/50 ℃/hr.

2. Material (part 1 and part 2)

Table 1 gives an overview of the materials used.

Table 1: overview of the materials used and their MFR and density

3. Experiment and results

Component 1

The components were pre-blended and then melt mixed and extruded using a twin extruder model ZSK26Mc from Coperion according to the settings of table 2.

Table 2: extruder set overview

Product of	POE/HDPE
		Zone 1 (. degree. C.)	20
Zone 2 (. degree. C.)	60
		Zone 3 (. degree. C.)	120
Zone 4 (. degree. C.)	200
		Zone 5 (. degree. C.)	200
Zone 6 (. degree. C.)	200
		Zone 7 (. degree. C.)	200
Zone 8 (. degree. C.)	230
		Zone 9 (. degree. C.)	230
Zone 10 (. degree. C.)	230
		Die temperature(℃)	230
Screw speed (RPM)	200
		Yield (kg/hr)	20

Table 3 gives an overview of the HDPE composition and its properties. The weight% HDPE is based on the amount of HDPE and polyolefin elastomer (POE) in the composition.

Different compositions of HDPE and propylene-ethylene copolymer (inventive samples) were prepared and compared to compositions of HDPE and ethylene-octene copolymer having the same weight percent HDPE (comparative example).

Table 3: polyolefin elastomer POE and HDPE blends and an overview of their Properties

The abrasion weight loss of the propylene-ethylene copolymer based composition is lower than that of the comparative example based on the same HDPE wt% but containing an ethylene-octene copolymer. The weight loss of the propylene-ethylene copolymer based composition is lower, but the MFR of the ethylene-octene copolymer is lower, and therefore the ethylene-octene copolymer has a higher molecular weight, which should result in better wear resistance as known, for example, from UHMWPE. Furthermore, the tensile stress and elongation at break of the inventive examples are much better.

Component 2

The components were pre-blended and then melt mixed and extruded using a twin extruder model ZSK26Mc from Coperion according to the settings of table 4.

Table 4: extruder set overview

Product of	POE/HDPE	POE/LLDPE	POE/PP
				Zone 1 (. degree. C.)	100	80	80
Zone 2 (. degree. C.)	180	180	210
				Zone 3 (. degree. C.)	180	180	210
Zone 4 (. degree. C.)	180	180	210
				Zone 5 (. degree. C.)	180	180	210
Zone 6 (. degree. C.)	180	180	210
				Zone 7 (. degree. C.)	180	180	210
Zone 8 (. degree. C.)	180	180	210
				Zone 9 (. degree. C.)	180	180	210
Zone 10 (. degree. C.)	180	180	210
				Die temperature (. degree. C.)	180	180	210
Screw speed (RPM)	300	300	300

Table 5: POE and HDPE, POE and LLDPE, POE and PP blends and overview of their Properties

Table 6: comparative example-abrasion weight loss overview of HDPE, LLDPE and PP

Material	Loss in abrasion weight (%)
		100％HPDE	2.71
100％LLDPE	1.50
		100％PP	5.17

As shown in tables 5 and 6, the abrasion weight loss of the propylene-ethylene copolymer-based composition with HDPE, LLDPE and PP is much less compared to HDPE, LLDPE and PP.