CN116200039A

CN116200039A - Rubber sleeve cable for building construction

Info

Publication number: CN116200039A
Application number: CN202310106555.3A
Authority: CN
Inventors: 华齐东; 於广勇; 吴海燕; 杨金花
Original assignee: Tianchang Huiling Electric Appliance Meter Factory
Current assignee: Tianchang Huiling Electric Appliance Meter Factory
Priority date: 2023-02-13
Filing date: 2023-02-13
Publication date: 2023-06-02

Abstract

The invention discloses a rubber jacketed cable for building construction, which belongs to the technical field of rubber jacketed cables and comprises a conductive wire core, wherein an insulating layer is coated on the outer side of the conductive wire core, a wrapping tape layer is coated on the outer side of the insulating layer, an armor layer is coated on the outer side of the wrapping tape layer, a cable jacket is coated on the outer side of the armor layer, and the cable jacket is prepared from a flame-retardant rubber material; the flame-retardant rubber material comprises the following raw materials in parts by weight: 80-95 parts of silicon rubber, 3-7 parts of phenolic resin, 1.5-3 parts of benzoxazine resin, 3-5 parts of modified sepiolite, 25-30 parts of expandable graphite, 1-1.5 parts of vulcanizing agent, 0.5-1.3 parts of silane coupling agent and 1-1.5 parts of hydroxyl silicone oil; according to the invention, the modified sepiolite and the expandable graphite are added into the silicone rubber material, so that the cable sheath can form a compact carbon layer in the combustion process, the volatilization of combustible gas is inhibited, the further combustion of a matrix is prevented, the flame retardant property is effectively improved, and the cable is endowed with excellent fireproof property.

Description

Rubber sleeve cable for building construction

Technical Field

The invention belongs to the technical field of cable preparation, and particularly relates to a rubber jacketed cable for building construction.

Background

The rubber sleeve cable is a flexible and movable cable variety which takes multi-strand thin copper wires as conductors and is covered with rubber insulation and a rubber sheath. Rubber jacketed cables are widely used in portable power cords for various electrical appliances, such as household appliances, electric machines, electrical appliances and appliances. And can be used under indoor or outdoor environmental conditions.

In recent years, with the continuous improvement of the technology level, the requirements for the use of building electric fields are increasing, and if a large amount of wires and cables are used for power transmission work, the accident rate of fire disaster of the building electric fields is increased, so that the rubber jacketed cable for building construction is required to have higher flame retardant performance. At present, the flame retardant performance of the cable is improved by adding a large amount of inorganic flame retardant or halogen-containing organic flame retardant, the mechanical performance of the cable material is damaged due to the fact that the inorganic flame retardant is added in a large amount, and the halogen-containing flame retardant generates toxic gas when being burnt to harm health, so that the rubber jacketed cable for building construction with better performance is the technical problem to be solved at present.

Disclosure of Invention

The invention aims to provide a rubber jacketed cable for building construction, which aims to solve the problems in the background technology.

The aim of the invention can be achieved by the following technical scheme:

the rubber jacketed cable for building construction comprises a conductive wire core, wherein an insulating layer is coated on the outer side of the conductive wire core, a wrapping tape layer is coated on the outer side of the insulating layer, an armor layer is coated on the outer side of the wrapping tape layer, and a cable sheath is coated on the outer side of the armor layer, and is prepared from a flame-retardant rubber material;

the flame-retardant rubber material comprises the following raw materials in parts by weight:

80-95 parts of silicon rubber, 3-7 parts of phenolic resin, 1.5-3 parts of benzoxazine resin, 3-5 parts of modified sepiolite, 25-30 parts of expandable graphite, 1-1.5 parts of vulcanizing agent, 0.5-1.3 parts of silane coupling agent and 1-1.5 parts of hydroxyl silicone oil.

Further, the modified sepiolite is prepared by the steps of:

step S1, stirring and mixing DOPO (9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) and vinyl trimethoxy silane uniformly, heating to 80 ℃, adding azodiisobutyronitrile, carrying out heat preservation reaction for 8-10h, and cooling to room temperature after the reaction is finished to obtain an intermediate product, namely a phosphorus-containing coupling agent;

and S2, uniformly mixing methanol, 37wt% hydrochloric acid solution and deionized water, placing the mixture in a constant-pressure dropping funnel, placing the doped sepiolite and an intermediate product in a three-neck flask, heating to 80 ℃, dropwise adding the mixture in the constant-pressure dropping funnel, reacting for 12 hours after the dropwise addition is finished, cooling, washing with methanol for 3-5 times, and drying at 80 ℃ for 24 hours to obtain the modified sepiolite.

Further, in step S1, the mass ratio of DOPO, vinyltrimethoxysilane, and azobisisobutyronitrile is 10:7.2:0.2, the intermediate product, namely the phosphorus-containing coupling agent, is prepared by utilizing the reaction of vinyl trimethyl siloxane and P-H bond in DOPO, and contains DOPO structure and siloxane structure.

Further, in step S2, the dosage ratio of methanol, 37wt% hydrochloric acid solution, deionized water, doped sepiolite and intermediate product is 30mL:2-3mL:20mL:10g:5g, hydrolyzing the siloxane structure of the intermediate product under an acidic condition to generate silanol, performing condensation reaction on the silanol and hydroxyl on the surface of the doped sepiolite, and introducing the intermediate product on the surface of the doped sepiolite in a chemical bonding mode to obtain the modified sepiolite.

Further, the doped sepiolite is prepared by the steps of:

adding sepiolite and absolute ethyl alcohol into a three-neck flask, stirring and dissolving, adding copper nitrate, then dropwise adding a copper molybdate aqueous solution, heating to 70 ℃ after the dropwise adding is finished, stirring and reacting for 12 hours, centrifugally separating a product after cooling, washing with absolute ethyl alcohol, and finally, vacuum drying for 6 hours at 50 ℃ in a drying oven and cooling to obtain doped sepiolite; the dosage ratio of sepiolite, absolute ethyl alcohol, copper nitrate and copper molybdate is 5g:30mL:2.4g:2.4g, copper molybdate is precipitated on the surface of sepiolite by using the high adsorptivity of sepiolite and a precipitation method, and flame retardant elements Mo and Cu are introduced on the surface of sepiolite, so that the flame retardant property of sepiolite is enhanced.

Further, the silicone rubber is prepared from methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber according to a mass ratio of 30-50: 12-32.

Further, the vulcanizing agent is one or more of vulcanizing agent BI PB, vulcanizing agent BP and vulcanizing agent DCP according to any proportion.

Further, the silane coupling agent is KH-550 and KH-570 according to the mass ratio of 1: 1.

Further, the rubber jacketed cable for building construction is prepared by the following steps:

firstly, extruding an irradiation ethylene propylene rubber material on the surface of a copper conductor to form an insulating layer, and filling gaps among wire cores with glue to form conductive wire cores;

secondly, wrapping double-sided water-blocking tape outside the conductive wire core to form a tape layer, arranging a tinned annealed copper wire braided sheath outside the tape layer, and coating sealing glue to form an armor layer;

and thirdly, putting the flame-retardant rubber material on a continuous vulcanization extrusion unit production line, carrying out melt extrusion at 270-290 ℃, forming a cable sheath on the surface of the armor layer, carrying out three-stage baking solidification treatment, and cooling.

Further, the three-stage baking solidification treatment specifically comprises: the first stage of baking is performed at 190-220 ℃ for 30s, the linear speed is 5-6 m/min, the second stage of baking is performed at 160-180 ℃ for 1 min, the linear speed is 10-12 m/min, the third stage of baking is performed at 115-155 ℃ for 1-2 min, and the linear speed is 8-10 m/min.

The invention has the beneficial effects that:

the rubber jacketed cable for building construction provided by the invention has excellent fireproof performance and is suitable for application in building construction; according to the invention, modified sepiolite and expandable graphite are added into a silicone rubber material, the sepiolite contains metal flame-retardant elements such as magnesium, potassium and the like, a certain amount of zeolite water exists, a certain flame-retardant effect is achieved, copper molybdate precipitate on the surface can play a synergistic effect with the expandable graphite to form a compact carbon layer, release of heat and smoke is prevented, phosphorus groups in organic matters on the surface of the modified sepiolite can promote carbon formation, a siloxane structure is decomposed at a high temperature to generate silicon dioxide, the compactness of the carbon layer is enhanced, the effect of inhibiting volatilization of combustible gas is achieved, further combustion of a matrix is prevented, the flame retardant property is effectively improved, and excellent fireproof performance is provided for a cable.

Detailed Description

The technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Example 1

A doped sepiolite made by the steps of:

adding 5g of sepiolite and 30mL of absolute ethyl alcohol into a three-neck flask, stirring and dissolving, adding 2.4g of copper nitrate, then dropwise adding an aqueous solution containing 2.4g of copper molybdate, heating to 70 ℃ after the dropwise adding is finished, stirring and reacting for 12 hours, cooling, centrifugally separating the product, cleaning with absolute ethyl alcohol, finally placing in a drying box, drying in vacuum for 6 hours at 50 ℃, and cooling to obtain the doped sepiolite.

Example 2

A modified sepiolite is prepared by the following steps:

step S1, uniformly stirring and mixing 10g of DOPO and 7.2g of vinyl trimethoxy silane, heating to 80 ℃, adding 0.2g of azodiisobutyronitrile, reacting for 8 hours in a heat-preserving way, and cooling to room temperature to obtain an intermediate product;

step S2, uniformly mixing 30mL of methanol, 2mL of 37wt% hydrochloric acid solution and 20mL of deionized water, placing in a constant pressure dropping funnel, placing 10g of the doped sepiolite of the embodiment 1 and 5g of intermediate product in a three-neck flask, heating to 80 ℃, dropwise adding the mixed solution in the constant pressure dropping funnel, reacting for 12h after the dropwise adding is finished, cooling, washing with methanol for 3 times, and drying at 80 ℃ for 24h to obtain the modified sepiolite.

Example 3

A modified sepiolite is prepared by the following steps:

step S1, uniformly stirring and mixing 10g of DOPO and 7.2g of vinyl trimethoxy silane, heating to 80 ℃, adding 0.2g of azodiisobutyronitrile, reacting for 10 hours in a heat-preserving way, and cooling to room temperature to obtain an intermediate product;

step S2, uniformly mixing 30mL of methanol, 3mL of 37wt% hydrochloric acid solution and 20mL of deionized water, placing in a constant pressure dropping funnel, placing 10g of the doped sepiolite of the embodiment 1 and 5g of intermediate product in a three-neck flask, heating to 80 ℃, dropwise adding the mixed solution in the constant pressure dropping funnel, reacting for 12h after the dropwise adding is finished, cooling, washing with methanol for 5 times, and drying at 80 ℃ for 24h to obtain the modified sepiolite.

Comparative example 1

Compared with example 2, the modified sepiolite is prepared by replacing the doped sepiolite in example 2 with sepiolite, and the rest raw materials and the preparation process are the same as those in example 2.

Comparative example 2

Compared with example 3, the modified sepiolite replaces the intermediate product of example 3 with vinyltrimethoxysilane, and the rest raw materials and the preparation process are the same as those of example 3.

Example 4

80 parts of silicon rubber, 3 parts of phenolic resin, 1.5 parts of benzoxazine resin, 3 parts of modified sepiolite of example 2, 25 parts of expandable graphite, 1 part of vulcanizing agent, 0.5 part of silane coupling agent and 1 part of hydroxyl silicone oil.

The rubber jacketed cable for building construction is prepared through the following steps:

Wherein the silicone rubber is prepared from methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber according to a mass ratio of 30:12, wherein the vulcanizing agent is a vulcanizing agent BIPB, the silane coupling agent is KH-550 and KH-570 according to the mass ratio of 1:1, the three-stage baking solidification treatment specifically comprises: the first stage of baking is performed at 190 ℃ for 30 seconds, the linear speed is 5 m/min, the second stage of baking is performed at 160 ℃ for 1 min, the linear speed is 11 m/min, and the third stage of baking is performed at 125 ℃ for 1 min, and the linear speed is 9 m/min.

Example 5

88 parts of silicon rubber, 5 parts of phenolic resin, 2 parts of benzoxazine resin, 4 parts of modified sepiolite of example 3, 28 parts of expandable graphite, 1.3 parts of vulcanizing agent, 0.9 part of silane coupling agent and 1.3 parts of hydroxyl silicone oil.

Wherein the silicone rubber is prepared from methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber according to a mass ratio of 50:12, wherein the vulcanizing agent is a vulcanizing agent BP, and the silane coupling agent is KH-550 and KH-570 according to the mass ratio of 1:1, the three-stage baking solidification treatment specifically comprises: the first stage of baking is performed at 220 ℃ for 30 seconds, the linear speed is 6 m/min, the second stage of baking is performed at 180 ℃ for 1 min, the linear speed is 12 m/min, and the third stage of baking is performed at 155 ℃ for 2 min, and the linear speed is 10 m/min.

Example 6

95 parts of silicon rubber, 7 parts of phenolic resin, 3 parts of benzoxazine resin, 5 parts of modified sepiolite of example 2, 30 parts of expandable graphite, 1.5 parts of vulcanizing agent, 1.3 parts of silane coupling agent and 1.5 parts of hydroxyl silicone oil.

Wherein the silicone rubber is prepared from methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber according to a mass ratio of 50:32, wherein the vulcanizing agent is a vulcanizing agent BP, the silane coupling agent is KH-550 and KH-570 according to the mass ratio of 1:1, the three-stage baking solidification treatment specifically comprises: the first stage of baking is performed at 220 ℃ for 30 seconds, the linear speed is 6 m/min, the second stage of baking is performed at 180 ℃ for 1 min, the linear speed is 12 m/min, and the third stage of baking is performed at 155 ℃ for 2 min, and the linear speed is 10 m/min.

Comparative example 3

In comparison with example 4, the modified sepiolite was replaced with the material of comparative example 1, and the remaining raw materials and the preparation process were the same as in example 4.

Comparative example 4

In comparison with example 4, the modified sepiolite was replaced with the material of comparative example 2, and the remaining raw materials and the preparation process were the same as in example 4.

The jacket layers of the rubber jacketed cables obtained in examples 4 to 6 and comparative examples 3 to 4 were subjected to performance test, and the oxygen index of the test specimen was measured with reference to GB/T2406-93 "oxygen index method for Plastic Combustion test method", and the results are shown in Table 1:

TABLE 1

Project	Example 4	Example 5	Example 6	Comparative example 3	Comparative example 4
						Oxygen index/%	35.1	36.2	36.8	29.8	30.4

As can be seen from Table 1, the rubber jacketed cables prepared in examples 4-6 were more flame retardant than those prepared in comparative examples 3-4.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. The rubber jacketed cable for building construction comprises a conductive wire core, wherein an insulating layer is coated on the outer side of the conductive wire core, a wrapping tape layer is coated on the outer side of the insulating layer, an armor layer is coated on the outer side of the wrapping tape layer, and a cable sheath is coated on the outer side of the armor layer, and the rubber jacketed cable is characterized in that the cable sheath is made of a flame-retardant rubber material;

80-95 parts of silicon rubber, 3-7 parts of phenolic resin, 1.5-3 parts of benzoxazine resin, 3-5 parts of modified sepiolite, 25-30 parts of expandable graphite, 1-1.5 parts of vulcanizing agent, 0.5-1.3 parts of silane coupling agent and 1-1.5 parts of hydroxyl silicone oil;

the modified sepiolite is prepared by the following steps:

and (3) uniformly mixing methanol, 37wt% hydrochloric acid solution and deionized water, then placing the mixture in a constant pressure dropping funnel, mixing the doped sepiolite and the phosphorus-containing coupling agent, heating to 80 ℃, dropwise adding the mixed solution in the constant pressure dropping funnel, and reacting for 12 hours after the dropwise adding is finished to obtain the modified sepiolite.

2. The rubber jacketed cable for construction according to claim 1, wherein the dosage ratio of methanol, 37wt% hydrochloric acid solution, deionized water, sepiolite doped and phosphorus-containing coupling agent is 30mL:2-3mL:20mL:10g:5g.

3. The rubber jacketed cable for building construction according to claim 1, wherein the phosphorus-containing coupling agent is prepared by the steps of:

and (3) uniformly stirring and mixing DOPO and vinyl trimethoxy silane, heating to 80 ℃, adding azodiisobutyronitrile, and carrying out heat preservation reaction for 8-10h to obtain the phosphorus-containing coupling agent.

4. A rubber jacketed cable for construction according to claim 3, wherein the mass ratio of DOPO, vinyltrimethoxysilane and azobisisobutyronitrile is 10:7.2:0.2.

5. the rubber jacketed cable for building construction according to claim 1, wherein the doped sepiolite is produced by the steps of:

mixing sepiolite and absolute ethyl alcohol, stirring and dissolving, adding copper nitrate, then dropwise adding an aqueous solution of copper molybdate, heating to 70 ℃ after the dropwise adding is finished, and stirring and reacting for 12 hours to obtain the doped sepiolite.

6. The rubber jacketed cable for building construction according to claim 5, wherein the usage ratio of sepiolite, absolute ethyl alcohol, copper nitrate and copper molybdate is 5g:30mL:2.4g:2.4g.

7. The rubber jacketed cable for building construction according to claim 1, wherein the silicone rubber is prepared from methyl vinyl silicone rubber and methyl phenyl vinyl silicone rubber according to a mass ratio of 30-50: 12-32.