An insulating blanket material for 10kv power distribution line live working and a preparation method thereof

Abstract

The application relates to the technical field of insulating materials, and particularly discloses an insulating blanket material for 10KV power distribution line live working and a preparation method thereof. The insulating blanket material for 10KV power distribution line live working comprises, in sequence, a polyvinyl acetate layer, an EVA adhesive layer, a base cloth layer, an EVA adhesive layer and a polyvinyl acetate layer; the polyvinyl acetate layer is composed of polyvinyl acetate 50-90%; epoxy soybean oil 1-5%; chlorinated paraffin 1-5%; a flame retardant 5-25%; tetraethyl pyromellitate 0.5-5%; a UV stabilizer 0.5-3%; a calcium-zinc composite stabilizer 0.5-5%; a titanate coupling agent 0.1-1%; and color masterbatch in a residual amount. The insulating blanket material solves the requirements for high-altitude live working and maintenance line network insulation protection, has the advantages of softness, good drapability, can be arbitrarily bent and wrapped and covers electric wires in the power distribution line, and has good flame retardance.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of insulating materials, and more particularly to an insulating blanket material for 10KV power distribution line live working and a preparation method. BACKGROUND

[0002] In the process of 10 kilovolt power distribution network maintenance and construction, the live working technology is an important technical means for improving power supply safety and reliability. As the most commonly used live working tool, the insulating blanket is mainly used for outdoor aerial working. In the power engineering working environment, due to high voltage and large current, in order to protect the construction personnel, the insulating blanket needs to be used to isolate the live body.

[0003] The insulating blanket is made of insulating materials, and the widely used ones are rubber-based insulating blankets and resin-based insulating blankets. However, the rubber insulating blanket has large thickness and poor flexibility, cannot be well suspended and attached to the live line in the power distribution operation, is easy to warp and deform, and affects the insulating shielding effect; and the resin insulating blanket is easy to be pierced by sharp cable objects in the power distribution line. SUMMARY

[0004] In order to improve the problem that the current insulating blanket cannot be well suspended and attached to the live line and is easy to warp and deform, and to improve the tear resistance and be more resistant to piercing, and to achieve the safety protection effect, the application provides an insulating blanket material for 10KV power distribution line live working and a preparation method.

[0005] In the first aspect, the application provides an insulating blanket material for 10KV power distribution line live working, which adopts the following technical scheme:

[0006] An insulating blanket material for 10KV power distribution line live working, comprising polyvinyl acetate layers, EVA glue layers, base cloth layers, EVA glue layers and polyvinyl acetate layers arranged in sequence.

[0007] The preparation raw material of the polyvinyl acetate layer is composed of the following components in percentage by weight:

[0008] Polyvinyl acetate 50-90%;

[0009] Epoxy soybean oil 1-5%;

[0010] Chlorinated paraffin 1-5%;

[0011] Flame retardant 5-20%;

[0012] Quaternary pentaerythritol tetrastearate 0.5-5%;

[0013] UV stabilizer 0.5-3%;

[0014] Calcium-zinc composite stabilizer 0.5-5%;

[0015] Titanate coupling agent 0.1-1%;

[0016] Color masterbatch balance.

[0017] By adopting the above technical scheme: the base cloth layer serves as an insulation blanket framework, the gram weight is reduced, the puncture resistance is improved, the EVA adhesive layer bonds the base cloth layer and the polyvinyl acetate layer which plays a major protective effect.

[0018] The addition of chlorinated paraffin and epoxy soybean oil can reduce the hardness of the polyvinyl acetate layer, make the insulation blanket softer and have better drapability, and can well wrap and cover the wires in the power distribution circuit; the addition of the flame retardant gives the layer excellent flame retardant performance, improves the heat protection performance of the insulation blanket; the addition of the stabilizer improves the heat protection, heat resistance and arc protection safety factor of the insulation blanket; through the compounding of the above five material layers, under the same performance, the unit area weight of the insulation blanket of the present application is reduced, the weight reduction rate reaches 30%, the overall material is lighter, and the wrapping performance is good, which can play an effective protection effect.

[0019] Optionally, the flame retardant is one or more of aluminum hydroxide, antimony trioxide and decabromodiphenyl ethane.

[0020] By adopting the above technical scheme: the aluminum hydroxide is decomposed into water vapor by heat absorption, the aluminum oxide is released when the antimony trioxide is burned to form a protective layer to isolate oxygen, and at the same time, heat is absorbed to reduce the burning temperature; decabromodiphenyl ethane has strong free radical capturing ability and can react with free radicals to form stable compounds. The above three kinds of flame retardants can be used in the polyvinyl acetate layer to inhibit the spread of flame and improve the flame retardant and heat insulation performance of the insulation blanket.

[0021] Optionally, the flame retardant is a mixture of aluminum hydroxide, antimony trioxide and decabromodiphenyl ethane;

[0022] The weight percentage of the aluminum hydroxide in the polyvinyl acetate layer is 1% to 5%;

[0023] The weight percentage of the antimony trioxide in the polyvinyl acetate layer is 1% to 5%;

[0024] The weight percentage of the decabromodiphenyl ethane in the polyvinyl acetate layer is 1% to 10%.

[0025] By adopting the above technical scheme: the three are compounded, and the amount is controlled within the above range, the flame retardant performance of the prepared insulation blanket is better.

[0026] Optionally, the gram weight of the polyvinyl acetate layer is 30-150g / m 2 , and the thickness is 30-150um.

[0027] By adopting the technical scheme, when the grammage and thickness of the polyvinyl acetate layer are within the above ranges, the heat protection and electric protection effects of the insulation blanket meet the use requirements, and the insulation blanket is soft in texture and good in wrapping property.

[0028] Optionally, the EVA adhesive layer is prepared from the following components by weight percentage:

[0029] EVA glue 70-95%;

[0030] Epoxy soybean oil 1-5%;

[0031] Chlorinated paraffin 1-5%;

[0032] Decabromodiphenyl ethane 1-5%;

[0033] Titanate coupling agent 0.1-1%;

[0034] Color masterbatch in excess.

[0035] By adopting the technical scheme, the EVA adhesive layer, the epoxy soybean oil and the chlorinated paraffin are compounded, so that the overall texture of the adhesive layer is soft, and the decabromodiphenyl ethane is further added to give the EVA adhesive layer flame retardant properties.

[0036] Optionally, the EVA adhesive layer has a grammage of 20-80 g / m 2 and a thickness of 20-50 um.

[0037] By adopting the technical scheme, when the EVA adhesive layer is within the above range, the adhesion effect on the base cloth layer and the polyvinyl acetate layer is good.

[0038] Optionally, the base cloth layer is prepared from one or more of polyester, nylon, chloronitrile, and aramid.

[0039] Optionally, the base cloth layer has a grammage of 30-120 g / m 2 and a thickness of 50-500 um.

[0040] In a second aspect, the application provides a preparation method of an insulation blanket material for 10KV power distribution line live working, which adopts the following technical scheme:

[0041] A preparation method of an insulation blanket material for 10KV power distribution line live working, comprising the following steps:

[0042] S1, preparation of a layer material:

[0043] Polyvinyl acetate, epoxy soybean oil, chlorinated paraffin, flame retardant, pentaerythritol tetrahydrogenated tetrastearate, UV stabilizer, calcium-zinc stabilizer, titanate coupling agent, and color masterbatch are stirred, mixed and dried to obtain a mixture A;

[0044] The EVA glue, epoxy soybean oil, chlorinated paraffin, decabromodiphenyl ethane, titanate coupling agent, color masterbatch are mixed, stirred, and dried to obtain mixture B;

[0045] S2, co-extrusion: the mixture A and the mixture B are subjected to double-layer co-extrusion to obtain a composite layer;

[0046] S3, compounding: two composite layers are laminated and attached to a base cloth layer, and the base cloth layer is arranged between the two composite layers and attached to the EVA glue layer; S4, cooling and winding, and the insulation blanket is obtained.

[0047] By adopting the above technical scheme, the steps are less, the process is simple and efficient, which is beneficial to the industrialized scale-up production of the insulation blanket, and the insulation blanket has good drapability and can effectively wrap the live equipment such as electric wires in the power distribution circuit, thereby achieving heat protection and electric protection effects.

[0048] Optionally, in the step S1, the stirring and drying conditions of the mixture A are as follows: time 30-60 min, temperature 70-85°C; and in the step S1, the stirring and drying conditions of the mixture B are as follows: time 20-30 min, temperature 70-85°C.

[0049] In the step S2, the co-extrusion conditions are as follows: temperature 50-100°C, extrusion pressure 30-80 MPa, and die discharge speed 0.1-1.2 m / s; and in the step S3, the laminating and attaching conditions are as follows: roller temperature 80-150°C, roller pressure 20-100 MPa, and roller linear speed 0.1-1.2 m / s.

[0050] In the step S4, the cooling conditions are as follows: temperature 5-20°C, time 10-30 s; and the winding conditions are as follows: speed 0.1-1.3 m / s, tension 50-300 N, and pressure roller linear speed 0.1-1.2 m / s.

[0051] By adopting the above technical scheme, the above parameters in the preparation process are controlled in combination with the performance of the materials, so that the performance of each layer of the prepared insulation blanket meets the use requirements, and the multi-layer structure is stably bonded and not easy to open, which can be used for a long time.

[0052] In summary, the present application has the following beneficial effects:

[0053] 1. The insulation blanket material of the present application is a five-layer structure, and the fiber base cloth layer is the basic framework. The polyvinyl acetate layer on both sides of the base cloth layer is bonded by the EVA glue layer to play a main protection effect. The overall weight is reduced by 30% compared with the current insulation blanket, and it is resistant to puncture. At the same time, chlorinated paraffin, epoxy soybean oil and flame retardant are added to improve the flame retardance, softness and drapability of the polyvinyl acetate layer to better wrap the circuit and achieve effective protection effects of electric protection, heat insulation and flame retardance.

[0054] 2. The application controls the weight and thickness of each layer, reduces the overall weight of the insulating blanket, and ensures the protection effect of the insulating blanket by improving the performance of the layer.

[0055] 3. The method of the application controls the preparation process parameters and preparation process of each layer to obtain a layer material with more excellent performance, thereby improving the safety factor of the insulating blanket. BRIEF DESCRIPTION OF DRAWINGS

[0056] Figure 1 is a schematic diagram of the overall structure of an insulating blanket material for 10KV power distribution line live working in Embodiment 1 of the application.

[0057] Reference signs: 1, polyvinyl acetate layer; 2, EVA adhesive layer; 3, base cloth layer. DETAILED DESCRIPTION

[0058] The application will be further described in detail below in combination with embodiments.

[0059] The sources of the components are as follows, and the components other than the following special components are from the market:

[0060] Polyvinyl acetate from Yantai Noda New Material Technology Co., Ltd., brand S4755;

[0061] Chlorinated paraffin from Jiangsu Sendi Chemical Technology Co., Ltd., brand 52;

[0062] Epoxy soybean oil from Jiangsu Sendi Chemical Technology Co., Ltd., brand ESO;

[0063] Aluminum hydroxide from China Aluminum Shanxi New Material Co., Ltd., brand Al(OH)3-1;

[0064] Antimony trioxide from Shanghai Zhaokuan Chemical Co., Ltd., brand DT-HZY;

[0065] Decabromodiphenyl ethane from Zhengzhou Chengjin Chemical Product Co., Ltd., brand DBDPE-25;

[0066] Pentaerythritol tetrahydroxy stearate from Jiaxing Ludong Daily Chemical Auxiliary Co., Ltd., brand JXHD-SYZS;

[0067] UV stabilizer from Changzhou Youfeng Chemical Co., Ltd., brand UV absorber UV531;

[0068] Calcium-zinc stabilizer from Jinan Xiangfeng Weiye Chemical Co., Ltd., brand GXZRJ1592;

[0069] Titanate coupling agent from Yangzhou Lida Resin Co., Ltd., brand LD-27;

[0070] Color masterbatch from Dongguan Jin Plastic Color Plastic Technology Co., Ltd., brand 80643;

[0071] EVA glue, from Dongguan Zhanyu Plastic Raw Material Co., Ltd., brand Elvax 260.

[0072] Example 1

[0073] An insulation blanket material for 10KV power distribution line live working, comprising polyvinyl acetate layer 1, EVA glue layer 2, base cloth layer 3, EVA glue layer 2 and polyvinyl acetate layer 1 arranged in sequence. Figure 1

[0074] The base cloth layer 3 is nylon mesh cloth, from Anhui Lixin County Huarun Screen Co., Ltd., model 30-50DPW, with a grammage of 30g / m 2 and a thickness of 100um.

[0075] The components in the insulation blanket material and their respective weights are shown in Table 1, and the insulation blanket material is prepared by the following steps:

[0076] S1, layer material preparation: polyvinyl acetate, epoxy soybean oil, chlorinated paraffin, flame retardant (consisting of aluminum hydroxide, antimony trioxide, decabromodiphenyl ethane), pentaerythritol tetrastearate, UV stabilizer, calcium-zinc stabilizer, titanate coupling agent, color masterbatch, stirring and mixing, drying at 80℃ for 45min, to obtain mixture A with a water content of less than 0.1%;

[0077] EVA glue, epoxy soybean oil, chlorinated paraffin, decabromodiphenyl ethane, titanate coupling agent, color masterbatch, stirring and mixing, drying at 80℃ for 25min, to obtain mixture B with a water content of less than 0.1%;

[0078] S2, co-extrusion: mixture A and mixture B are simultaneously fed into an extrusion double-component die for double-layer co-extrusion, at a temperature of 75℃, an extrusion pressure of 55MPa, and a die discharge speed of 1.0m / s, to obtain a composite layer, wherein the grammage of the polyvinyl acetate layer 1 is controlled to be 50g / m 2 with a thickness of 100um; the grammage of the EVA glue layer 2 is 20g / m 2 with a thickness of 20um;

[0079] S3, compounding: take two composite layers, adhere the EVA glue layer 2 of one of the composite layers to the upper surface of the base cloth layer 3, and pass through a first roller and a second roller for calendering and adhesion, adhere the EVA glue layer 2 of the other composite layer to the lower surface of the base cloth layer 3, and pass through a second roller and a third roller for calendering and adhesion, to obtain a pre-pressed product containing a five-layer structure, and then pass the pre-pressed product through a fourth roller and a fifth roller for calendering and adhesion, wherein:

[0080] ​The first roller temperature is 120℃, the second roller temperature is 100℃, the third roller temperature is 125℃, the pressure between the first roller and the second roller is 60MPa; the pressure between the second roller and the third roller is 60MPa; the surface linear speed of the first roller, the second roller and the third roller is 1.0m / s; the fourth roller temperature is 125℃, the fifth roller temperature is 125℃, the pressure between the fourth roller and the fifth roller is 60Mpa, the surface linear speed of the fourth roller and the fifth roller is 0.8m / s, the distance between the fourth roller and the fifth roller is 3.5mm;

[0081] S4, air cooling, air cooling temperature is 15℃, air cooling time is 20s, winding, winding speed is 1.0m / s, winding tension is 200N, the surface linear speed of the compression roller is 1.0m / s, and the product is obtained.

[0082] It should be noted that the preparation step conditions of the present application can be selected within the following range according to the production line requirements, and the selection does not have a great influence on the performance of the insulating blanket material. In the present application, only one of them is briefly introduced as an example. The selection range is as follows:

[0083] In step S1, the drying conditions of mixture A are as follows: time 30-60min, temperature 70-85℃; the stirring drying conditions of mixture B are as follows: time 20-30min, temperature 70-85℃;

[0084] In step S2, the co-extrusion conditions are as follows: temperature 50-100℃, extrusion pressure 30-80MPa, die discharge speed 0.10-1.2m / s; in step S3, the first roller temperature is 100-150℃, the second roller temperature is 80-120℃, the third roller temperature is 100-150℃, the pressure between the first roller and the second roller is 20-100MPa; the pressure between the second roller and the third roller is 20-100MPa; the surface linear speed of the first roller, the second roller and the third roller is 0.1-1.2m / s; the fourth roller temperature is 100-150℃, the fifth roller temperature is 100-150℃, the pressure between the fourth roller and the fifth roller is 20-100Mpa, the surface linear speed of the fourth roller and the fifth roller is 0.1-1.2m / s, the distance between the fourth roller and the fifth roller is 0.05-5mm;

[0085] In step S4, the air cooling temperature is 5-20℃, the air cooling time is 10-30s, the winding speed is 0.1-1.3m / s, the winding tension is 50-300N, and the surface linear speed of the compression roller is 0.1-1.2m / s.

[0086] The flame retardant of the present application can select one or more of aluminum hydroxide, antimony trioxide and decabromodiphenyl ethane. The above selection does not have a great influence on the performance of the insulating blanket, and the present application only briefly introduces the three as an example.

[0087] Example 2-3, Comparative Example 1-3

[0088] An insulating blanket material for live-line work on 10KV distribution lines differs from that in Example 1 in that the amount of each component is different. The components and their corresponding weights are shown in Table 1.

[0089] Table 1. Components and their weights (kg) in Examples 1-3 and Comparative Examples 1-3

[0090]

[0091] It should be noted that, in this application, the specifications of the following layers can be selected within the following ranges according to the production line requirements: the thickness and basis weight of the polyvinyl acetate layer 1 can be 30-150 μm in thickness and 30-150 g / m² in basis weight. 2 The thickness and basis weight of the EVA adhesive layer 2 can be selected from 20-50µm and 20-80g / m². 2 The base fabric layer 3 can be selected from a range of materials, including polyester mesh, nylon mesh, acrylic chlorofiber mesh, and aramid mesh, with a basis weight of 30-120 g / m². 2 The thickness can be selected within the range of 50-500 μm. This application only briefly introduces one of them as an example.

[0092] Performance testing

[0093] The insulating blankets prepared in the examples and comparative examples were tested for tensile strength, tear resistance, flame retardancy and abrasion resistance according to DL / T 803-2015 "Insulating Blankets for Live Working" and AC withstand voltage test according to DL / T 976-2005 "Preventive Test Procedures for Live Working Tools, Devices and Equipment". The withstand breakdown voltage was recorded and the test results are recorded in Table 2.

[0094] Table 2 Performance Test Results

[0095]

[0096] Based on the data in Table 2, the insulating blankets prepared in Examples 1-3 have low tensile strength, an overall thickness of only 220 μm, and a basis weight of only 100 g / m². 2 The overall texture is lightweight and soft, effectively covering live equipment. At the same time, it has a balanced performance in terms of flame retardancy, tear resistance, abrasion resistance, and breakdown voltage resistance, meeting the requirements for use and providing good protection. The difference between Comparative Examples 1 and 2 and Example 2 is that the amount of components is different, and the performance of each component is reduced to varying degrees, failing to meet the requirements for use. Comparative Example 3 lacks epoxidized soybean oil and chlorinated paraffin, resulting in a significantly increased tensile strength of the insulating blanket, but a harder texture, making it difficult to effectively wrap live equipment and also failing to meet the requirements for use.

[0097] The embodiments are only illustrative of the present application, and are not intended to limit the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. An insulating blanket material for live-line work on 10KV distribution lines, characterized in that, It includes a polyvinyl acetate layer (1), an EVA adhesive layer (2), a base fabric layer (3), an EVA adhesive layer (2), and a polyvinyl acetate layer (1) arranged sequentially; The raw materials for preparing the polyvinyl acetate layer (1) consist of the following components by weight percentage: Polyvinyl acetate 50-90%; Epoxidized soybean oil 1-5%; Chlorinated paraffin 1-5%; Flame retardant 5-20%; Pentaerythritol stearate 0.5-5%; UV stabilizer 0.5-3%; Calcium-zinc compound stabilizer 0.5-5%; Titanate coupling agent 0.1-1%; Color masterbatch balance.

2. The insulating blanket material for live-line work on 10KV distribution lines according to claim 1, characterized in that: The flame retardant is one or more of aluminum hydroxide, antimony trioxide, and decabromodiphenyl ethane.

3. The insulating blanket material for live-line work on 10KV distribution lines according to claim 2, characterized in that: The flame retardant is a mixture of aluminum hydroxide, antimony trioxide, and decabromodiphenyl ethane; The aluminum hydroxide in the polyvinyl acetate layer (1) is 1-5% by weight; The antimony trioxide content in the polyvinyl acetate layer (1) is 1-5% by weight; The weight percentage of decabromodiphenyl ethane in the polyvinyl acetate layer (1) is 1-10%.

4. The insulating blanket material for live-line work on 10KV distribution lines according to claim 1, characterized in that: The basis weight of the polyvinyl acetate layer (1) is 30-150 g / m². 2 The thickness is 30-150um.

5. The insulating blanket material for live-line work on 10KV distribution lines according to claim 1, characterized in that, The raw materials for preparing the EVA adhesive layer (2) consist of the following components by weight percentage: EVA adhesive 70-95%; Epoxidized soybean oil 1-5%; Chlorinated paraffin 1-5%; Decabromodiphenyl ethane 1-5%; Titanate coupling agent 0.1-1%; Color masterbatch balance.

6. The insulating blanket material for live-line work on 10KV distribution lines according to claim 5, characterized in that: The basis weight of the EVA adhesive layer (2) is 20-80 g / m³. 2 The thickness is 20-50um.

7. The insulating blanket material for live-line work on 10KV distribution lines according to claim 1, characterized in that: The raw materials for preparing the base fabric layer (3) are one or more of polyester, nylon, acrylic fiber, and aramid.

8. The insulating blanket material for live-line work on 10KV distribution lines according to claim 7, characterized in that: The basis weight of the base fabric layer (3) is 30-120 g / m². 2 The thickness is 50-500μm.

9. A method for preparing an insulating blanket material for live-line work on 10kV distribution lines as described in any one of claims 1-8, characterized in that, Includes the following steps: S1, Preparation of layer material: Polyvinyl acetate, epoxidized soybean oil, chlorinated paraffin, flame retardant, pentaerythritol tetrastearate, UV stabilizer, calcium-zinc stabilizer, titanate coupling agent, and color masterbatch are stirred, mixed, and dried to obtain mixture A. EVA glue, epoxidized soybean oil, chlorinated paraffin, decabromodiphenyl ethane, titanate coupling agent, and color masterbatch are stirred, mixed, and dried to obtain mixture B; S2. Co-extrusion: Mixture A and mixture B are co-extruded in two layers to obtain a composite layer; S3, Composite: Take two composite layers and calender them together with the base fabric layer (3). The base fabric layer (3) is placed between the two composite layers and is bonded to the EVA adhesive layer (2). S4. Cool, rewind, and you will get the product.

10. The method for preparing the insulating blanket material for live-line work on 10KV distribution lines according to claim 9, characterized in that: In step S1, the drying conditions for mixture A are: time 30-60 min, temperature 70-85℃; In step S1, the drying conditions for mixture B are: time 20-30 min, temperature 70-85℃; In step S2, the co-extrusion conditions are: temperature 50-100℃, extrusion pressure 30-80MPa, and die head discharge speed 0.1-1.2m / s; In step S3, the calendering and bonding conditions are: roller temperature 80-150℃, roller pressure 20-100MPa, and roller linear speed 0.1-1.2m / s; In step S4, the cooling conditions are: temperature 5-20℃, time 10-30s; the winding conditions are: speed 0.1-1.3m / s, tension 50-300N, and pressure roller linear speed 0.1-1.2m / s.

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