阅读说明：本技术 聚烯烃和聚乙烯吡咯烷酮配制物 (Polyolefin and polyvinylpyrrolidone formulations ) 是由 何超 孙亚斌 J·M·柯吉恩 T·J·珀森 陈红宇 于 2019-03-11 设计创作，主要内容包括：一种聚烯烃和聚乙烯吡咯烷酮配制物,其包含(A)烯烃类(共)聚合物、(B)聚乙烯吡咯烷酮(共)聚合物和(C)抗氧化剂。此外,制备所述组合物的方法；通过固化所述组合物制备的交联聚烯烃产物；包含成型形式的所述本发明配制物或产物的制品；和使用所述本发明配制物、产物或制品的方法。(A polyolefin and polyvinylpyrrolidone formulation comprising (a) an olefinic (co) polymer, (B) a polyvinylpyrrolidone (co) polymer and (C) an antioxidant. Further, a method of making the composition; a crosslinked polyolefin product prepared by curing the composition; an article comprising said inventive formulation or product in a shaped form; and methods of using the inventive formulations, products or articles.)

1. A polyolefin and polyvinylpyrrolidone formulation comprising 79.99 weight percent (wt%) to 99.94 wt% of (a) an olefinic (co) polymer; 0.05 to 20.0% by weight of (B) a polyvinylpyrrolidone (co) polymer; and 0.01 to 1.5 wt% of (C) an antioxidant; with the proviso that the formulation does not contain an antistatic agent and carbon black.

2. The polyolefin and polyvinylpyrrolidone formulation of claim 1, wherein the (a) olefinic (co) polymer is (i) an ethylene-based (co) polymer, a propylene-based (co) polymer, or a combination of any two or more thereof; or (ii) a polyethylene homopolymer, an ethylene/alpha-olefin copolymer, an ethylene/unsaturated carboxylic acid ester copolymer, an ethylene/olefin-functional hydrolyzable silane copolymer, or a combination of any two or more thereof.

3. A polyolefin and polyvinylpyrrolidone formulation according to claim 1 or 2 wherein the (B) polyvinylpyrrolidone (co) polymer is a polyvinylpyrrolidone homopolymer or a polyvinylpyrrolidone/olefin comonomer copolymer.

4. The polyolefin and polyvinylpyrrolidone formulation according to any one of claims 1-3, wherein the (C) antioxidant is a hindered phenol, a phosphite, a phosphonite, a thio compound, an antioxidant amine, or a combination of any two or more thereof.

5. The polyolefin and polyvinylpyrrolidone formulation of any one of claims 1-4, wherein said polyolefin and polyvinylpyrrolidone formulation comprises from 80.50 wt% to 99.70 wt% of said (A) olefin-based (co) polymer; 0.1 to 15.0 wt% of the (B) polyvinylpyrrolidone (co) polymer; 0.10 to 1.5 wt% of said (C) antioxidant; and 0.1 to 3% by weight of (D) an organic peroxide; with the proviso that the formulation does not contain an antistatic agent and carbon black.

6. The polyolefin and polyvinylpyrrolidone formulation of any one of claims 1-5, wherein the antistatic agent is an ethoxylated alkylamine, an ethoxylated dialkylamine, a fatty acid ester, a poly (ethylene glycol ester), a polyglycerol ester, a glycidyl ester, an alkyl sulfonate, a pentaerythritol ester, a sorbitan ester, or a diethanolamide of a carboxylic acid.

7. The polyolefin and polyvinylpyrrolidone formulation of any one of claims 1-6, further comprising at least one additive selected from optional additives (E) to (K): (E) stabilizers (e.g., compounds that inhibit Ultraviolet (UV) light-related degradation); (F) a scorch retarder; (G) an alkenyl-functional coagent; (H) a nucleating agent; (I) a processing aid; (J) an extender oil; and (K) nanoparticles.

8. The polyolefin and polyvinylpyrrolidone formulation according to any one of claims 1-7, characterized in that (i) the Water Tree Length (WTL) increases by less than 10% when measured according to the water tree growth test method using ASTM D6097; (ii) a dissipation factor of less than 0.30% when measured according to the dissipation factor test method; or both (i) and (ii).

9. The polyolefin and polyvinylpyrrolidone formulation of any one of claims 1-8 comprising ingredients (A) to (C), (D) an organic peroxide, and (E) a stabilizer, wherein the (A) olefin-based (co) polymer is a low density polyethylene containing comonomer units derived from 1-butene, 1-hexene, or 1-octene; the (B) polyvinylpyrrolidone (co) polymer is a polyvinylpyrrolidone homopolymer, a vinylpyrrolidone/vinyl acetate copolymer or a polyvinylpyrrolidone-graft- (1-triacontene) copolymer having a weight average molecular weight (Mw) of 10,000 to 40,000 g/mol; the (C) antioxidant is a hindered phenol, a thio compound or a combination of a hindered phenol and a thio compound; and the (D) organic peroxide is a dicumyl peroxide compound.

10. A process for preparing a polyolefin and polyvinylpyrrolidone formulation according to any one of claims 1 to 9, comprising mixing the (B) polyvinylpyrrolidone (co) polymer and (C) an antioxidant into a melt of the (a) olefin-based (co) polymer to obtain a melt blend comprising ingredients (a), (B) and (C); optionally extruding the melt blend to obtain an extrudate comprising ingredients (a), (B) and (C); optionally granulating the extrudate to obtain pellets comprising ingredients (a), (B) and (C); and optionally adding (D) an organic peroxide to the melt blend, extrudate or pellet to obtain the polyolefin and polyvinylpyrrolidone formulation.

11. A crosslinked polyolefin product which is the product of curing a polyolefin and polyvinylpyrrolidone formulation according to any one of claims 1 to 9.

12. An article comprising the polyolefin and polyvinylpyrrolidone formulation of any of claims 1-9 in shaped form, the polyolefin and polyvinylpyrrolidone formulation prepared by the process of claim 10, or the crosslinked polyolefin product of claim 11.

13. An insulated electrical conductor comprising a conductive core and an insulating layer at least partially covering the conductive core, wherein at least a portion of the insulating layer comprises the polyolefin and polyvinylpyrrolidone formulation of any one of claims 1-9, the polyolefin and polyvinylpyrrolidone formulation prepared by the process of claim 10, or the crosslinked polyolefin product of claim 11.

14. A method of conducting electricity, the method comprising applying a voltage across the conductive core of the insulated electrical conductor of claim 13 so as to generate a current through the conductive core.

Technical Field

Formulations of polyolefins and polyvinylpyrrolidones, and related aspects.

Background

Insulated electrical conductors typically comprise a conductive core covered by an insulating layer. The conductive core may be solid or stranded (e.g., a bundle of wires). Some insulated electrical conductors may also contain one or more additional elements, such as a semiconducting layer(s) and/or a protective sheath (e.g., a wire wrap, tape, or sheath). Examples are coated metal wires and power cables, including metal wires and power cables used in low voltage ("LV", >0 to <5 kilovolts (kV)), medium voltage ("MV", 5 to <69kV), high voltage ("HV", 69 to 230kV) and extra high voltage ("EHV", >230kV) transmission/distribution applications. The power cable may be evaluated using standard and/or IEC testing methods.

Compositions are described in US 4,412,938; US 4,291,094; US5,649,041; US 8,217,105B 2; and CN 105778300A.

Disclosure of Invention

We recognize the problem of operating at higher voltages and exposure to moisture compromising the performance of the power cable. Under these conditions, over time, water tree growth may occur in the insulation layer, which may lead to electrical treeing therein, which in turn may ultimately lead to failure of the insulation layer. By using a more resilient material in the insulating layer, the time to reach such failures can be extended and thus the reliability of the power transmission is improved and the maintenance costs are reduced. However, the material solutions proposed in the past for MV power cables result in unacceptable dissipation factors if higher voltages (HV or EHV power cables) are used.

We have found that the use of more of certain water tree retardant additives does not necessarily improve the inhibition of water tree branching and can worsen it. In addition, the additional retarder can cause other problems, such as blooming or bleeding of the water tree retardant (i.e., migration of the water tree retardant from the interior portion of the insulation layer to the surface of the insulation layer). Furthermore, many additives that inhibit water treeing cause other problems, such as a large increase in dissipation factor. The problem to be solved is therefore to find a new polyolefin-containing formulation which better inhibits the growth of water trees and thus of electrical trees without migration and without a large increase in dissipation factor.

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Our technical solution to this problem includes polyolefin and polyvinylpyrrolidone formulations comprising: (A) olefin (co) polymers; (B) polyvinylpyrrolidone (co) polymers; and (C) an antioxidant ("inventive formulation"). The invention further relates to a method for producing the inventive formulation; crosslinked polyolefin products prepared by curing the inventive formulations ("inventive products"); an article comprising the formulation or product of the invention in shaped form ("article of the invention"); and methods of using the formulations, products or articles of the invention.

The formulations, products and articles of the present invention are useful in electrical transmission applications. While the formulations of the present invention are contemplated in the course of addressing the foregoing problems with insulated electrical conductors, the articles and uses of the formulations of the present invention are not limited to insulated electrical conductors or power transmission and water tree inhibition applications. The articles and uses of the formulations of the present invention also include other articles, such as containers or vehicle parts, and their appropriate uses.

Detailed Description