CN110684303A

CN110684303A - Wear-resistant PVC cable and preparation method thereof

Info

Publication number: CN110684303A
Application number: CN201911026750.5A
Authority: CN
Inventors: 韦文成
Original assignee: Dongguan Wenchang Electronic Products Co Ltd
Current assignee: Dongguan Wenchang Electronic Products Co Ltd
Priority date: 2019-10-26
Filing date: 2019-10-26
Publication date: 2020-01-14

Abstract

The invention relates to the field of cable preparation, in particular to a wear-resistant PVC cable and a preparation method thereof, wherein the wear-resistant PVC cable comprises a cable conducting core and an outer protective sleeve, the outer protective sleeve coats the cable conducting core, and the outer protective sleeve comprises the following components in parts by weight: 75-90 parts of PVC resin; 25-30 parts of calcium carbonate; 8-12 parts of tree ash; 2-10 parts of a silane coupling agent; 20-30 parts of dioctyl phthalate; 10-15 parts of rubber powder; 5-8 parts of a halogen-free flame retardant; 0.5-1 part of antioxidant, and the preparation method of the wear-resistant PVC cable comprises the following steps: s1, weighing the raw materials; s2, stirring and mixing the raw materials weighed in the S1 to obtain a mixture; s3, extruding and granulating the mixture obtained in the step S2 to obtain outer protective sleeve master batches; and S4, melting and extruding the master batch of the outer protective sleeve, coating the master batch on the periphery of the cable core, and cooling and solidifying to obtain the wear-resistant PVC cable.

Description

Wear-resistant PVC cable and preparation method thereof

Technical Field

The invention relates to the technical field of cable preparation, in particular to a wear-resistant PVC cable and a preparation method thereof.

Background

Cables are generally made up of one or more mutually insulated conductor cores and outer protective sheaths, the conductors carrying power or information from one location to another. With the rapid development of economy, more and more sites require cables to transmit power or other information, and therefore, more stringent requirements are imposed on the manufacture of cables. The cable sheath is the indispensable intermediate structure part of cable, plays the effect of protection cable, guarantees the circular telegram safety of cable, lets medium such as copper wire and water, air isolated avoid appearing the electric leakage phenomenon.

The wear resistance of the cable sheath is an important performance index, and particularly for PVC cables, the wear resistance is low, which directly affects the service life of the cable.

Disclosure of Invention

The first purpose of the invention is to provide a wear-resistant PVC cable, the outer protective sleeve of which has better wear resistance, and the wear resistance of the cable can be improved, thereby prolonging the service life of the cable.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a wear-resisting PVC cable, is including leading cable core and outer lag, outer lag cladding leads cable core, outer lag includes the component of following part by weight:

75-90 parts of PVC resin;

25-30 parts of calcium carbonate;

8-12 parts of tree ash;

2-10 parts of a silane coupling agent;

20-30 parts of dioctyl phthalate;

10-15 parts of rubber powder;

5-8 parts of a halogen-free flame retardant;

0.5-1 part of antioxidant.

By adopting the technical scheme, the PVC resin is used as the main component of the outer protective sleeve in the raw material system, the calcium carbonate and the tree ash are used as the filler, and the filler is filled into the raw materials, so that on one hand, the porosity inside the raw materials is favorably reduced, and the stability inside the raw materials is improved, on the other hand, the dispersibility of the whole filler is favorably improved after the tree ash and the calcium carbonate are mixed, so that the filler can be uniformly distributed in the raw material system, and the wear resistance of the prepared outer protective sleeve is favorably improved; the addition of the silane coupling agent is beneficial to improving the binding force between organic matters and inorganic matters in a raw material system, so that the structural compactness of the inner part of the prepared outer protective sleeve is improved; the rubber powder is added to further improve the toughness and the wear-resisting strength of the outer protective sleeve, so that the prepared cable has good toughness, tensile strength and wear-resisting performance; the dioctyl phthalate plays a role of a plasticizer in a raw material system and is favorable for reducing the melt viscosity during processing, and the calcium carbonate, tree ash, a silane coupling agent, dioctyl phthalate and rubber powder are added into the raw material systems such as PVC resin, an antioxidant, a halogen-free flame retardant and the like, and the addition amount of the raw materials is controlled within a specific range by weight, so that the prepared outer protective sleeve has better wear resistance and tensile property, the wear resistance and tensile strength of a cable with the outer protective sleeve are further improved, and the service life of the cable is further prolonged.

Further, the outer protective sleeve comprises the following components in parts by weight:

83 parts of PVC resin;

30 parts of calcium carbonate;

10 parts of tree ash;

9 parts of a silane coupling agent;

28 parts of dioctyl phthalate;

15 parts of rubber powder;

8 parts of a halogen-free flame retardant;

and 1 part of antioxidant.

Further, the calcium carbonate is modified calcium carbonate, and the preparation method of the modified calcium carbonate comprises the following steps:

(1) mixing 60-80 parts by weight of calcium carbonate powder, 0.5-3 parts by weight of iron slag powder, 6-8 parts by weight of polytetrafluoroethylene, 0.5-3 parts by weight of graphene and 4-6 parts by weight of hydroxyl silicone oil, grinding for 25-30min, and sieving with a 250-mesh sieve to obtain a mixture A;

(2) fully mixing 2-3 parts by weight of methyltriethoxysilane, 1-2 parts by weight of zirconium fluoride, 1-2 parts by weight of nano silicon dioxide, 1-2 parts by weight of cross-linking agent TAC and 1-2 parts by weight of ascorbic acid, and grinding for 35-40min until the mixture is uniformly dispersed to obtain a mixture B;

(3) mixing the mixture A and the mixture B, stirring for 20-25min, grinding for 15-20min, and sieving with a 300-400 mesh sieve to obtain a mixture C;

(4) and adding 3-4 parts by weight of hexadecyl trimethyl ammonium bromide and 3.5-5.5 parts by weight of polyacrylamide into the mixture C, mixing for 10-15min, continuously adding 4-6 parts by weight of sodium lignosulfonate and 4-6 parts by weight of isooctyl dimethyl dimercaptoacetate tin, and continuously grinding until the components are uniformly dispersed to obtain the modified calcium carbonate.

Further, the mesh number of the modified calcium carbonate is 200-300 meshes.

By adopting the technical scheme, calcium carbonate is modified by using various surface modifiers such as hexadecyl trimethyl ammonium bromide, polyacrylamide, sodium lignosulfonate and hydroxyl silicone oil in specific weight parts, so that the performance of the calcium carbonate is changed, the performance indexes such as the oil absorption value, viscosity and activation rate of the powder are changed, and the dispersion and compatibility of the powder in a raw material system for preparing the outer protective sleeve are facilitated, thereby achieving a good reinforcing effect, being beneficial to improving the structural strength of the outer protective sleeve, and simultaneously, the addition of polytetrafluoroethylene and graphene is beneficial to further improving the flexibility and wear resistance of the outer protective sleeve.

Further, the tree ash is modified tree ash, and the preparation method of the modified tree ash comprises the following steps:

a. soaking tree ash in 10-15 wt% sodium hydroxide solution for 2-3 hr;

b. soaking the mixture for 2 to 3 hours by using a hydrochloric acid solution with the volume fraction of 10 to 15 percent;

c. washing with deionized water for several times until the tree ash is neutral, and drying;

d. grinding to 0.8-1.0 μm powder to obtain modified tree ash.

By adopting the technical scheme, the addition of the tree ash can promote the dispersion of the calcium carbonate, so that the calcium carbonate and the tree ash can be integrally and uniformly distributed in a raw material system.

Further, the silane coupling agent is prepared by mixing KH550 and KH560 in a weight ratio of 1-1.5: 1, in a mixture of the components.

By adopting the technical scheme, the KH550 and the KH560 are mixed according to a specific weight ratio to obtain the silane coupling agent, which is beneficial to improving the binding force between organic matters and fillers in a raw material system, thereby improving the structural compactness of the interior of a finished product.

Further, the rubber powder is derived from waste tires, and the rubber powder is a mixture of natural rubber, styrene butadiene rubber and butadiene rubber.

Further, the mesh number of the rubber powder is 100-200 meshes.

By adopting the technical scheme, the rubber powder is derived from the waste tire, the manufacturing cost of the outer protective sleeve is favorably reduced, and meanwhile, the mesh number of the rubber powder is controlled to be between 100 meshes and 200 meshes, so that the rubber powder can be more fully mixed in a re-raw material system in the process of preparing the outer protective sleeve, and the integral toughness and wear resistance of the outer protective sleeve are further improved.

Further, the antioxidant is a mixture of antioxidant 168 and antioxidant 1010 in a weight ratio of 1: 1-1.2.

The second purpose of the invention is to provide a preparation method of the wear-resistant PVC cable, and the prepared cable has better wear resistance.

A preparation method of a wear-resistant PVC cable comprises the following steps:

s1, weighing the raw materials according to the components of PVC resin, calcium carbonate, tree ash, a silane coupling agent, rubber powder, a halogen-free flame retardant, an antioxidant and dioctyl phthalate;

s2, stirring and mixing the raw materials weighed in the S1, heating to 50-60 ℃, and stirring for 20-30min to obtain a mixture;

s3, putting the mixture obtained in the step S2 into a double-screw extruder for extrusion granulation, wherein the temperature of the extruder is set as follows: the first zone is 170-;

and S4, melting and extruding the master batch of the outer protective sleeve, coating the master batch on the periphery of the cable core, and cooling and solidifying to obtain the wear-resistant PVC cable.

By adopting the technical scheme, the components of the outer protective sleeve are preheated and dried firstly, then the outer protective sleeve master batch for preparing the outer protective sleeve is prepared in a mixing stirring and extruding granulation mode, finally the outer protective sleeve master batch is melted and extruded through an extruder and coated on the periphery of the cable guide core, and finally the wear-resistant PVC cable is obtained after cooling and solidification, so that the prepared cable has wear-resistant performance and the service life of the cable is prolonged.

In conclusion, the invention has the following beneficial effects:

1. according to the invention, calcium carbonate, tree ash, a silane coupling agent, dioctyl phthalate and rubber powder are added into raw material systems such as PVC resin, an antioxidant and a halogen-free flame retardant, and the addition amount of the raw materials is controlled within a specific range by weight, so that the prepared outer protective sleeve has better wear resistance and tensile property, the wear resistance and tensile strength of the cable with the outer protective sleeve are further improved, and the service life of the cable is further prolonged.

2. The components of the outer protective sleeve are preheated and dried firstly, then the outer protective sleeve master batch for preparing the outer protective sleeve is prepared in a mixing stirring and extruding granulation mode, finally the outer protective sleeve master batch is melted and extruded through an extruder and coated on the periphery of the cable guiding core, and finally the wear-resistant PVC cable is obtained after cooling and solidification, so that the prepared cable has wear-resistant performance and the service life of the cable is prolonged.

Detailed Description

The present invention will be described in further detail with reference to examples.

Example 1

The components and parts by weight of the outer protective sleeve of the wear-resistant PVC cable are shown in Table 1.

Wherein, the calcium carbonate is modified calcium carbonate, the components for preparing the modified calcium carbonate and the parts by weight thereof are shown in table 2, and the preparation method of the modified calcium carbonate is as follows:

(1) mixing calcium carbonate powder, iron slag powder, polytetrafluoroethylene, graphene and hydroxyl silicone oil in corresponding weight parts, grinding for 25min, and sieving with a 250-mesh sieve to obtain a mixture A.

(2) And fully mixing methyl triethoxysilane, zirconium fluoride, nano silicon dioxide, a crosslinking agent TAC and ascorbic acid in corresponding weight parts, and grinding for 35min until the mixture is uniformly dispersed to obtain a mixture B.

(3) And mixing the mixture A and the mixture B, stirring for 20min, grinding for 15min, and sieving by using a 300-mesh sieve to obtain a mixture C.

(4) And adding cetyl trimethyl ammonium bromide and polyacrylamide in corresponding weight parts into the mixture C, mixing for 10min, continuously adding sodium lignosulfonate and isooctyl dimethyl dimercaptoacetate tin in corresponding weight parts, and continuously grinding until the components are uniformly dispersed to obtain the modified calcium carbonate.

In this example, the modified calcium carbonate had a mesh size of 200 mesh.

In this example, the tree ash is a modified tree ash, which is prepared as follows:

a. soaking tree ash in 10 wt% sodium hydroxide solution for 2 hr.

b. Soaking the mixture for 2 hours by using a hydrochloric acid solution with the volume fraction of 10 percent.

c. Washing with deionized water for several times until the tree ash is neutral, and oven drying.

d. Grinding to 0.8 μm powder to obtain modified tree ash.

In the present embodiment, the silane coupling agent is prepared by mixing KH550 and KH560 at a weight ratio of 1:1, in a mixture of the components.

Wherein the rubber powder is derived from waste tires, and the rubber powder is a mixture of natural rubber, styrene butadiene rubber and butadiene rubber. The mesh number of the rubber powder is 100 meshes.

Wherein the antioxidant is a mixture of antioxidant 168 and antioxidant 1010 in a weight ratio of 1:1.

s1, weighing the raw materials according to the components of PVC resin, calcium carbonate, tree ash, a silane coupling agent, rubber powder, a halogen-free flame retardant, an antioxidant and dioctyl phthalate.

And S2, stirring and mixing the raw materials weighed in the S1, heating to 50 ℃, and stirring for 20min to obtain a mixture.

S3, putting the mixture obtained in the step S2 into a double-screw extruder for extrusion granulation, wherein the temperature of the extruder is set as follows: the first zone is 170-.

Among them, dioctyl phthalate is available from Jiangsu Kernel's technology, Ltd.

Example 2

A wear resistant PVC cable differing from example 1 in that: the components and the parts by weight of the outer protective sleeve are shown in table 1.

(1) mixing calcium carbonate powder, iron slag powder, polytetrafluoroethylene, graphene and hydroxyl silicone oil in corresponding weight parts, grinding for 28min, and sieving with a 250-mesh sieve to obtain a mixture A.

(2) And fully mixing methyl triethoxysilane, zirconium fluoride, nano silicon dioxide, a crosslinking agent TAC and ascorbic acid in corresponding weight parts, and grinding for 37min until the mixture is uniformly dispersed to obtain a mixture B.

(3) And mixing the mixture A and the mixture B, stirring for 23min, grinding for 18min, and sieving by a 350-mesh sieve to obtain a mixture C.

(4) And adding cetyl trimethyl ammonium bromide and polyacrylamide in corresponding weight parts into the mixture C, mixing for 13min, continuously adding sodium lignosulfonate and isooctyl dimethyl dimercaptoacetate tin in corresponding weight parts, and continuously grinding until the components are uniformly dispersed to obtain the modified calcium carbonate.

In this example, the modified calcium carbonate had a mesh size of 250 mesh.

a. soaking tree ash in 12 wt% sodium hydroxide solution for 2.5 hr.

b. Soaking the mixture for 2.5 hours by using a hydrochloric acid solution with the volume fraction of 12 percent.

d. Grinding to 0.9 μm powder to obtain modified tree ash.

In the present example, the silane coupling agent is prepared from KH550 and KH560 in a weight ratio of 1.3: 1, in a mixture of the components.

Wherein the rubber powder is derived from waste tires, and the rubber powder is a mixture of natural rubber, styrene butadiene rubber and butadiene rubber.

Wherein the mesh number of the rubber powder is 150 meshes.

Wherein the antioxidant is a mixture of antioxidant 168 and antioxidant 1010 in a weight ratio of 1: 1.1.

And S2, stirring and mixing the raw materials weighed in the S1, heating to 55 ℃, and stirring for 25min to obtain a mixture.

Example 3

(1) mixing calcium carbonate powder, iron slag powder, polytetrafluoroethylene, graphene and hydroxyl silicone oil in corresponding weight parts, grinding for 30min, and sieving with a 250-mesh sieve to obtain a mixture A.

(2) And fully mixing methyl triethoxysilane, zirconium fluoride, nano silicon dioxide, a crosslinking agent TAC and ascorbic acid in corresponding weight parts, and grinding for 40min until the mixture is uniformly dispersed to obtain a mixture B.

(3) And mixing the mixture A and the mixture B, stirring for 25min, grinding for 20min, and sieving by a 400-mesh sieve to obtain a mixture C.

(4) And adding cetyl trimethyl ammonium bromide and polyacrylamide in corresponding weight parts into the mixture C, mixing for 15min, continuously adding sodium lignosulfonate and isooctyl dimethyl dimercaptoacetate tin in corresponding weight parts, and continuously grinding until the components are uniformly dispersed to obtain the modified calcium carbonate.

In this example, the mesh number of the modified calcium carbonate was 300 mesh.

a. soaking tree ash in 15 wt% sodium hydroxide solution for 3 hr.

b. Soaking the mixture for 3 hours by using a hydrochloric acid solution with the volume fraction of 15 percent.

d. Grinding to a powder of 1.0 μm to obtain a modified tree ash.

In the present embodiment, the silane coupling agent is prepared from KH550 and KH560 in a weight ratio of 1.5: 1, in a mixture of the components.

Wherein the mesh number of the rubber powder is 200 meshes.

Wherein the antioxidant is a mixture of antioxidant 168 and antioxidant 1010 in a weight ratio of 1: 1.2.

And S2, stirring and mixing the raw materials weighed in the S1, heating to 60 ℃, and stirring for 30min to obtain a mixture.

Example 4

A wear resistant PVC cable differing from example 2 in that: the components and the parts by weight of the outer protective sleeve are shown in table 1.

The components used to prepare the modified calcium carbonate and their parts by weight are shown in table 2.

Example 5

A wear resistant PVC cable differing from example 4 in that: the components and the parts by weight of the outer protective sleeve are shown in table 1.

Table 1 components of the outer protective cover and parts by weight thereof.

Table 2 components used to prepare the modified calcium carbonate and parts by weight thereof.

Comparative example 1

The difference from example 2 is that: the calcium carbonate is not modified.

Comparative example 2

The difference from example 2 is that: the tree ash is not modified.

Comparative example 3

The difference from example 2 is that: KH550 was used directly as the silane coupling agent.

Comparative example 4

The wear-resistant cable is prepared from a wear-resistant halogen-free flame-retardant cable material with an authorization notice number of CN 103524938B.

The test data of each example and comparative example are shown in Table 3.

The finished cables prepared in examples 1 to 5 and comparative examples 1 to 4 were sampled and set as samples 1 to 9, respectively.

Experiment 1

The samples 1 to 9 were tested for mass wear rate (%) using a wear tester, and the smaller the value, the stronger the wear resistance, and the test results are reported in Table 3.

Experiment 2

Samples 1-9 were tested for tensile strength (MPa) according to GB/T528-1998 standard and the results are reported in Table 3.

TABLE 3 test results of experiments 1-2 carried out on samples 1-9.

	Tensile strength	Mass wear rate (%)
			Sample No. 1	16.2	3.2
Sample No. 2	16.6	2.9
			Sample No. 3	17.3	2.7
Sample No. 4	17.8	2.5
			Sample No. 5	18.1	2.3
Sample No. 6	14.3	5.7
			Sample 7	14.2	5.3
Sample 8	14.1	5.3
			Sample 9	14.8	5.4

As can be seen from the data in table 3, the tensile strength of the present example 5 is relatively higher than that of the other examples, and the mass wear rate of the present example 5 is smaller than that of the other examples, which indicates that when the weight portion of calcium carbonate is 30, the weight portion of tree ash is 10, the weight portion of silane coupling agent is 9, and the weight portion of rubber powder is 15, the wear resistance and tensile property of the outer protective sleeve obtained at this time are better, so that the tensile strength and wear resistance of the cable with the outer protective sleeve are stronger, which is beneficial to prolonging the service life of the cable.

The tensile strength and the mass wear rate of the samples 4-5 are better than those of the samples 1-3, which shows that the mechanical strength of the calcium carbonate is improved after the calcium carbonate is modified, so that the mechanical property in a raw material system is further improved, and the compound of the modified calcium carbonate and the modified tree ash is beneficial to further improving the uniform dispersion of the modified calcium carbonate and the modified tree ash in the raw material system, and is beneficial to improving the integral mechanical property of the outer protective sleeve, so that the cable with the outer protective sleeve has better tensile strength and smaller mass wear rate.

The comparison example 1 adopts unmodified calcium carbonate, and the comparison example 2 adopts unmodified tree ash, and it can be known from the above detection results that the mechanical properties of the prepared outer protective sleeve are poorer than those of the samples 1-5 no matter the modified tree ash is compounded with the unmodified calcium carbonate or the unmodified tree ash is compounded with the modified calcium carbonate, which indicates that the calcium carbonate and the tree ash need to be modified to ensure that the prepared cable and the outer protective sleeve thereof have better tensile strength and wear resistance.

In comparative example 3, KH550 alone was used as the silane coupling agent, and the effect of promoting the bonding between the PVC resin and inorganic substances such as calcium carbonate and tree ash in the raw material system was not achieved as much as that obtained in example 2 in which KH550 and KH560 were used in a weight ratio of 1.3: the silane coupling agent consisting of the component 1 has good promoting effect on inorganic matters such as PVC resin, calcium carbonate, tree ash and the like.

According to the granted patent document CN103524938B, a wear-resistant cable made of a wear-resistant halogen-free flame-retardant cable material, as shown in Table 3, although the tensile strength of sample 9 is higher than that of samples 6-8, and the mass wear rate of sample 9 is lower than that of samples 6-8, the wear resistance of sample 9 is relatively poor compared with that of samples 1-5.

According to the detection comparison, the prepared cable has better tensile strength and wear resistance, so that the cable is not easily worn in the using process, and the conductive cable core is not easily exposed due to the wear of the outer protective sleeve to a certain extent, so that the safety of a user using the cable is greatly improved, and meanwhile, the service life of the cable is prolonged.

The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but only protected by the patent laws within the scope of the claims.

Claims

1. The utility model provides a wear-resisting PVC cable, characterized by: including leading cable core and outer lag, outer lag cladding leads cable core, outer lag includes the component of following part by weight:

75-90 parts of PVC resin;

25-30 parts of calcium carbonate;

8-12 parts of tree ash;

2-10 parts of a silane coupling agent;

20-30 parts of dioctyl phthalate;

10-15 parts of rubber powder;

5-8 parts of halogen-free flame retardant.

2. A wear resistant PVC cable according to claim 1, characterized by: the outer protective sleeve comprises the following components in parts by weight:

83 parts of PVC resin;

30 parts of calcium carbonate;

10 parts of tree ash;

9 parts of a silane coupling agent;

28 parts of dioctyl phthalate;

15 parts of rubber powder;

8 parts of a halogen-free flame retardant;

and 1 part of antioxidant.

3. A wear resistant PVC cable according to claim 2, characterized by: the calcium carbonate is modified calcium carbonate, and the preparation method of the modified calcium carbonate comprises the following steps:

4. A wear resistant PVC cable according to claim 3, characterized by: the mesh number of the modified calcium carbonate is 200-300 meshes.

5. A wear resistant PVC cable according to claim 2, characterized by: the tree ash is modified tree ash, and the preparation method of the modified tree ash comprises the following steps:

a. soaking tree ash in 10-15 wt% sodium hydroxide solution for 2-3 hr;

d. grinding to 0.8-1.0 μm powder to obtain modified tree ash.

6. A wear resistant PVC cable according to claim 2, characterized by: the silane coupling agent is prepared from KH550 and KH560 according to the weight ratio of 1-1.5: 1, in a mixture of the components.

7. A wear resistant PVC cable according to claim 2, characterized by: the rubber powder is derived from waste tires and is a mixture of natural rubber, styrene butadiene rubber and butadiene rubber.

8. A wear-resistant PVC cable as claimed in claim 7, wherein: the mesh number of the rubber powder is 100-200 meshes.

9. A wear resistant PVC cable according to claim 2, characterized by: the antioxidant is a mixture of antioxidant 168 and antioxidant 1010 in a weight ratio of 1: 1-1.2.

10. A process for the preparation of a wear resistant PVC cable according to any of claims 1-9, comprising the steps of: