CN113053578A - Water-blocking powder for waterproof cable, preparation method of water-blocking powder and waterproof cable - Google Patents
Water-blocking powder for waterproof cable, preparation method of water-blocking powder and waterproof cable Download PDFInfo
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- CN113053578A CN113053578A CN202110316980.6A CN202110316980A CN113053578A CN 113053578 A CN113053578 A CN 113053578A CN 202110316980 A CN202110316980 A CN 202110316980A CN 113053578 A CN113053578 A CN 113053578A
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- waterproof cable
- waterproof
- lignosulfonate
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- 238000002360 preparation method Methods 0.000 title abstract description 21
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Images
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/285—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable
- H01B7/288—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable using hygroscopic material or material swelling in the presence of liquid
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/22—Sheathing; Armouring; Screening; Applying other protective layers
Abstract
The application relates to the field of cable processing, and particularly discloses water-blocking powder for a waterproof cable, a preparation method of the water-blocking powder and the waterproof cable. The water-blocking powder for the waterproof cable is prepared from the following raw materials in parts by weight: 80-130 parts of acrylic acid, 20-40 parts of lignosulfonate, 10-30 parts of urea, 10-20 parts of kaolin, 1-2 parts of initiator and 0.3-0.7 part of cross-linking agent; the preparation method comprises the following steps: acrylic acid is neutralized, then acrylic acid, lignosulfonate and urea are initiated by an initiator, kaolin and a cross-linking agent are added for ultrasonic reaction, and dehydration, drying and crushing are carried out after the reaction is finished to prepare the water-blocking powder. The waterproof layer of the waterproof cable uses the water-blocking powder, and can achieve a good water-blocking effect in a salt solution.
Description
Technical Field
The application relates to the field of cable processing, in particular to water-blocking powder for a waterproof cable, a preparation method of the water-blocking powder and the waterproof cable.
Background
Waterproof cables are a generic term for a class of cables that can be used normally in water, and are often laid under water or in wet places. At present, the most commonly used cable in China is a crosslinked polyethylene insulated power cable (hereinafter referred to as an XLPE cable), the XLPE cable is simple in production process and excellent in mechanical and physical properties, water tree aging is easy to occur, namely, moisture invades the XLPE cable, water branches are generated in an insulating layer of the XLPE cable, the water branches are converted into electric branches when reaching a certain degree, the electric branches damage the insulating layer under the influence of operating voltage, the service life of the XLPE cable is shortened, and even serious consequences such as power failure are caused. Therefore, XLPE cables need to have good water resistance when laid in water environments.
The method of using modified cross-linked polyethylene insulating material or adding water tree inhibitor into cross-linked polyethylene to inhibit the generation of water tree branches at early home and abroad has insignificant effect and high cost. Later-period practice proves that the waterproof layer arranged on the longitudinal structure of the XLPE cable can achieve a better waterproof effect.
The waterproof layer of an XLPE cable is typically located between the wires of the XLPE cable and the conductor shield. The waterproof layer is generally made of water-blocking powder, the water-blocking powder is filled in a gap between a lead of the XLPE cable and the conductor shielding layer, and water is blocked by utilizing the water absorption expansibility of the water-blocking powder. When moisture invades the XLPE cable, the water-blocking powder absorbs water rapidly and expands to block the moisture from flowing into a capillary channel of the XLPE cable, and the moisture is not contacted with the lead, so that the waterproof effect is achieved.
In the related art, the water-blocking powder is polyacrylic acid type resin, which has good water absorption but poor salt tolerance. When the XLPE cable is applied to an environment with high salt solution concentration such as offshore equipment or salt chemical plants, for example, when polyacrylic resin is soaked in seawater (with the salinity of 35 per thousand), the water absorption capacity of the polyacrylic resin is only 100mL/g, the expansion height reaches only 1.6mm/3min, the polyacrylic resin cannot play a good swelling blocking role, the water seepage length of the prepared waterproof cable is up to 20.9cm, and the waterproof performance of the waterproof cable in the salt solution is poor.
Disclosure of Invention
In order to improve the waterproof performance of a waterproof cable in a salt solution, the application provides the water-blocking powder for the waterproof cable, the preparation method of the water-blocking powder and the waterproof cable.
In a first aspect, the application provides a water-blocking powder for a waterproof cable, which adopts the following technical scheme:
the water-blocking powder for the waterproof cable is prepared from the following raw materials in parts by weight:
80-130 parts of acrylic acid
20-40 parts of lignosulfonate
10-30 parts of urea
3-5 parts of kaolin
1-2 parts of initiator
0.3-0.7 part of cross-linking agent.
By adopting the technical scheme, after the initiator initiates the acrylic acid, the lignosulfonate and the urea, the acrylic acid, the lignosulfonate and the urea form free radicals, the free radicals undergo chain growth polymerization to form a prepolymer, finally, the prepolymer is subjected to crosslinking modification on the surface of the kaolin under the action of the crosslinking agent, and the acrylic acid, the lignosulfonate and the urea are subjected to the polymerization inhibition of the kaolin to form a proper network structure;
meanwhile, under the combined action of the ionized ions on the kaolin and the charged groups (such as sulfonic acid groups) on the cross-linked network, the osmotic pressure inside and outside the network structure is increased. The water-blocking powder obtained by adopting the scheme has the water absorption amount of 380mL/g in seawater (the salinity is 35 per thousand), the expansion height of 8.6mm/3min, the water-blocking powder has better salt resistance, the water-absorbing swelling effect is obvious, and when the water-blocking powder is applied to a waterproof cable, the water-blocking powder can play a better swelling blocking role and improve the waterproof performance of the waterproof cable in a salt solution.
Preferably, the weight ratio of acrylic acid, lignosulfonate, urea and kaolin is 110:30:20: 4.
By adopting the technical scheme, the cross-linking degree of the formed water-blocking powder is better under the mass ratio of the acrylic acid, the lignosulfonate, the urea and the kaolin, and the salt resistance of the water-blocking powder can be further improved, so that the water absorption capacity of the water-blocking powder in seawater (the salinity is 35 per thousand) reaches 538mL/g, and the expansion height reaches 12.2mm/3 min.
Preferably, the lignosulfonate is any one of calcium lignosulfonate, sodium lignosulfonate and magnesium lignosulfonate.
Preferably, the number average molecular weight of the lignosulfonate is 4000-5000.
By adopting the technical scheme, the cross-linked network formed in the range of the number average molecular weight is regular, the cross-linked density is moderate, the cross-linked network formed in the range of the number average molecular weight is loose, the water absorption capacity is reduced, the cross-linked network formed in the range of the number average molecular weight is compact, and the water absorption capacity is also reduced.
Preferably, the kaolin has an average particle size of 300-500 nm.
By adopting the technical scheme, the average particle size of the kaolin is in the range, the obtained polymerization inhibition effect is good, the network structure of the surface of the kaolin is regular, the cross-linking density is moderate, meanwhile, the particle size of the kaolin is small, the activation of active sites on the surface of the kaolin is facilitated, the promotion effect on the water absorption and the wetting of the water-resistant powder in seawater is achieved, and when the particle size of the kaolin is too small, the agglomeration is easy to occur, so that the water absorption is reduced.
In a second aspect, the application provides a method for preparing water-blocking powder for a waterproof cable, which adopts the following technical scheme:
a preparation method of water-blocking powder for a waterproof cable comprises the following steps:
p1, adding acrylic acid into alkali liquor for neutralization, wherein the neutralization degree is 40-70mol%, and obtaining a pretreated acrylic acid solution;
p2, adding lignosulfonate, urea and an initiator into the pretreated acrylic acid solution, heating to 55-65 ℃ under the protection of nitrogen, and preserving heat for 1-2.5 hours to obtain a prefabricated liquid;
p3, adding kaolin and a cross-linking agent into the prepared liquid for ultrasonic dispersion, wherein the ultrasonic frequency is 30-50Hz, the ultrasonic time is 0.5-1h, and taking out the mixed liquid after the ultrasonic treatment;
and P4, dehydrating, drying and crushing the mixed solution to obtain the water-blocking powder.
By adopting the technical scheme, the polymerization rate of the acrylic acid is too high, the polymerization rate of the acrylic acid is delayed after the acrylic acid is neutralized by the sodium hydroxide, and the initiator initiates the acrylic acid, the lignosulfonate and the urea firstly, so that the acrylic acid, the lignosulfonate and the urea form a large amount of free radicals, the acrylic acid, the lignosulfonate and the urea are favorable for subsequent crosslinking grafting on the kaolin, the density of a crosslinking network on the surface of the kaolin is moderate, and the water absorption swelling effect of the water-blocking powder in a salt solution is good.
Preferably, in the step P1, the neutralization degree of acrylic acid and sodium hydroxide is 60 mol%.
By adopting the technical scheme, under the neutralization degree, the grafting rate of the lignosulfonate and the urea on the surface of the kaolin is higher, the density of a cross-linked network formed by the water-blocking powder is moderate, and the water-absorbing swelling effect in a salt solution is better.
Preferably, the holding time in the step P2 is 2 h.
By adopting the technical scheme, the heat preservation time is short, the initiating effect of the initiator on the lignosulfonate is poor, the grafting efficiency of the lignosulfonate is reduced, the salt resistance effect of the water-blocking powder is weakened, the initiating time is too long, the content of free radicals of acrylic acid is too high, the density of a formed cross-linked network is high, and the water absorption rate is poor, so that the free radical content of each component in the prefabricated liquid is moderate in the heat preservation time, and the water absorption swelling effect of the prepared water-blocking powder is good.
Preferably, the drying method in step P3 of the reaction treatment is drying at 100 ℃ for 1h, and then drying at 60 ℃ for 2 h.
By adopting the technical scheme, when the drying temperature is lower, the water-blocking powder needs longer drying time, the water-blocking powder is easy to degrade under the condition of low-temperature drying, and when the drying temperature is higher, the water-blocking powder is easy to undergo self-crosslinking reaction at high temperature, so that the crosslinking density on the surface of the kaolin is increased, the water absorption rate of the water-blocking powder is reduced.
In a third aspect, the present application provides a waterproof cable, which adopts the following technical scheme:
a waterproof cable comprises a waterproof layer, wherein the waterproof layer is made of the waterproof powder for the waterproof cable.
Through adopting above-mentioned technical scheme, waterproof cable's waterproof layer adopts the powder that blocks water that this scheme was made to effectively reduce waterproof cable's infiltration length, plays good water-proof effects.
In summary, the present application has the following beneficial effects:
1. because the acrylic acid, the lignosulfonate, the urea and the kaolin are adopted for crosslinking modification, active sites on the kaolin are activated, under the combined action of ionized ions on the kaolin and charged groups (such as sulfonic groups) on a crosslinking network, the osmotic pressure inside and outside the network structure is increased, and the water-blocking powder has better salt resistance, can play a better swelling blocking role, and improves the waterproof performance of the waterproof cable in a salt solution.
2. The waterproof layer of the waterproof cable of this application adopts the powder that blocks water that this scheme was made can effectively reduce waterproof cable's infiltration length, plays good water-proof effects.
Drawings
Fig. 1 is a schematic view of a waterproof structure of the cable of the present application.
The attached drawings of the specification: 1. a wire; 2. a waterproof layer; 3. a conductor shield layer; 4. an XLPE insulating layer; 5. longitudinally wrapping an aluminum-plastic composite belt; 6. an outer sheath.
Detailed Description
Unless otherwise specified, the sources of the following preparations, examples and comparative examples are shown in table 1 below:
TABLE 1 sources of raw materials
Preparation example of purified sodium Lignosulfonate
Preparation example 1
A purified sodium lignosulfonate is prepared by the following preparation method:
(1) adding sodium lignosulfonate into deionized water, stirring and mixing uniformly to prepare a sodium lignosulfonate mixed solution with the concentration of 6 wt%;
(2) transferring the sodium lignosulfonate mixed solution to a UF201 ultrafilter (produced by Wuxi Saipu membrane science and technology development Co., Ltd.), filtering by using an ultrafiltration membrane with the interception number average molecular weight of 10000, wherein the working pressure is 0.142MPa, circularly ultrafiltering until ultrafiltrate penetrating through micropores of the ultrafiltration membrane is colorless transparent solution which is sodium lignosulfonate solution, the number average molecular weight of sodium lignosulfonate in the solution is 10000, and drying to obtain the purified sodium lignosulfonate.
Preparation example 2
A purified sodium lignin sulfonate, which is different from preparation example 1 in that the ultrafiltration membrane in step (2) has a cut-off number average molecular weight of 3000.
Preparation example 3
A purified sodium lignin sulfonate is different from the sodium lignin sulfonate prepared in preparation example 1 in that the ultrafiltration membrane in step (2) has a cut-off number average molecular weight of 4000.
Preparation example 4
A purified sodium lignin sulfonate, which is different from preparation example 1 in that the ultrafiltration membrane in step (2) has a cut-off number average molecular weight of 5000.
Examples
Example 1
The water-blocking powder for the waterproof cable is prepared by the following preparation method:
p1, weighing 80g of acrylic acid, dropwise adding the acrylic acid into 1L of 17.8g/L sodium hydroxide solution in an ice water bath while stirring, wherein the dropwise adding rate is 3 drops per second, and after the dropwise adding of the acrylic acid is finished (the neutralization degree is 40 mol%), preparing a pretreated acrylic acid solution;
p2, weighing 10g of urea, 1g of potassium persulfate and 20g of sodium lignosulfonate, adding the urea, the potassium persulfate and the sodium lignosulfonate into a pretreated acrylic acid solution, stirring and uniformly mixing, heating to 55 ℃ under the protection of nitrogen, and preserving heat for 1h to obtain a prefabricated liquid;
p3, weighing 3g of kaolin (the average particle size of the kaolin is 1 mu m) and 0.3g of N, N '-methylene bisacrylamide, adding the kaolin and the N, N' -methylene bisacrylamide into the prefabricated liquid for ultrasonic dispersion, wherein the ultrasonic frequency is 30Hz, the ultrasonic time is 1h, and taking out the mixed liquid after the ultrasonic treatment;
and (3) placing the P4 and the mixed solution in an oven, drying at 80 ℃ to constant weight, drying at 120 ℃ for 3h, and crushing the dried solid to obtain the water-blocking powder.
Examples 2 to 6
A water-blocking powder for a waterproof cable is prepared on the basis of example 1, and is different from example 1 in that the composition of raw materials is different, and the specific composition of the raw materials is shown in the following table 3.
TABLE 2 composition of the raw materials
Examples 12 to 14
A water-blocking powder for a waterproof cable, prepared on the basis of example 11, differs from example 11 in the number average molecular weight of sodium lignosulfonate, which was derived from preparation example 2 in example 12, sodium lignosulfonate, which was derived from preparation example 3 in example 13, and sodium lignosulfonate, which was derived from preparation example 4 in example 14.
Examples 15 to 17
A water-blocking powder for a waterproof cable, prepared on the basis of example 14, is different from example 14 in that the kaolin in example 15 has an average particle size of 200nm, in example 16 has an average particle size of 300nm, and in example 17 has an average particle size of 500 nm.
Examples 18 to 19
A water-blocking powder for a waterproof cable is prepared on the basis of example 17, and is different from example 17 in that the neutralization degree of acrylic acid and sodium hydroxide in the acrylic acid pretreatment step is different, and the specific neutralization degree process parameters are shown in the following table 3.
TABLE 3 neutralization Process parameters
Examples 20 to 23
A water-blocking powder for a waterproof cable is prepared on the basis of example 18, and is different from example 18 in that the process parameters corresponding to the steps P2-P4 are different, and the specific parameters are shown in the following table 4.
TABLE 4 Process parameters during the reaction treatment
Examples 24 to 25
A water-blocking powder for a waterproof cable is prepared on the basis of example 1, and is different from example 1 in that sodium lignosulfonate is replaced by equal-mass calcium lignosulfonate in example 24, and sodium lignosulfonate is replaced by equal-mass magnesium lignosulfonate in example 24.
Comparative example
Comparative example 1
A polyacrylic resin type water-resistant powder is WL-80Z, and is available from Zhejiang Weilong polymer materials Co.
Comparative example 2
A polyacrylic acid grafted polyacrylamide water-blocking powder is R-PL1378-X, and is purchased from Xianruixi biological technology Co.
Comparative examples 3 to 6
A water-blocking powder is different from example 1 in the composition of the raw materials, and the specific composition is shown in Table 5 below.
TABLE 5 composition of the raw materials
Application example
The present application is described in further detail below with reference to fig. 1 and application examples.
A waterproof cable comprises a lead 1, a waterproof layer 2, a conductor shielding layer 3, an XLPE insulating layer 4, a longitudinal aluminum-plastic composite belt 5 and an outer sheath 6 which are sequentially arranged from inside to outside along the cable.
The lead 1 is made of copper, aluminum and other metals with the purity of more than or equal to 99 percent and is used for transmitting electric signals.
The waterproof layer 2 is made of an embodiment, the embodiment is filled into a mold and pressed into a sleeve shape under the pressure of 5kPa, and the waterproof layer 2 is sleeved on the lead 1.
The conductor shield 3 is made of silicon dioxide for avoiding electrical discharges between the wire 1 and the XLPE insulation 4. Conductor shielding layer 3 parcel three wire 1 and waterproof layer 2, can extrude waterproof layer 2 when conductor shielding layer 3 contracts, and waterproof layer 2 is broken, and the powder becomes powdered again that hinders of cover tube-like fills between wire 1 and conductor shielding layer 3.
The XLPE insulation layer 4 is melt extruded from polyethylene material for uniform waterproof cable electric field.
The longitudinal aluminum-plastic-coated composite belt 5 is tightly wound on the outer wall of the XLPE insulating layer 4, and has a good radial waterproof effect.
The outer sheath 6 is generally made of polyethylene or polyvinyl chloride and is positioned on the outermost layer of the cable, so that the outer sheath plays a role in protection and insulation, and the service life of the cable is prolonged.
Application examples 1 to 23
The waterproof cable has the structure shown in the application examples, and is different from the waterproof layer in the water-blocking powder source, and the specific source is shown in the following table 6.
TABLE 6 source of water-blocking powder for water-proof layer
Comparative application example
Comparative application examples 1 to 6
A waterproof cable is shown in comparative application examples 1-6, except that the waterproof layer has different water-blocking powder sources, and the specific sources are shown in the following table 7.
TABLE 7 source of water-blocking powder for water-proof layer
| Application example | Source of water-blocking powder | Application example | Source of water-blocking powder |
| Comparative application example 1 | Comparative example 1 | Comparative application example 4 | Comparative example 4 |
| Comparative application example 2 | Comparative example 2 | Comparative application example 5 | Comparative example 5 |
| Comparative application example 3 | Comparative example 3 | Comparative application example 6 | Comparative example 6 |
Performance test
1. A waterproof powder detection project for waterproof cable:
detecting the water absorption capacity and the expansion height of the water-blocking powder according to a test method in YD/T1115.3-201X industry standard:
A. the liquid absorbed by the water-blocking powder is water, and the water absorption amount a is correspondingly recorded1Expansion height a2；
B. The liquid absorbed by the water-blocking powder is seawater (salinity is 35 per mill), and water absorption is correspondingly recordedAmount b1Expansion height b2；
C. The liquid absorbed by the water-blocking powder is seawater (salinity is 60 per mill), and the water absorption capacity c is correspondingly recorded1Expansion height c2；
2. Detection items of the waterproof cable:
water seepage length: detecting according to method F5B of 23.2.2 in GB/T7424.2-2008, soaking a waterproof cable sample in different liquids, setting different soaking times, and detecting the water seepage length, wherein the detection conditions are specifically shown in the following table 8:
TABLE 8 test conditions
The result of the detection
TABLE 9 Water absorption of examples 1 to 25 and comparative examples 1 to 6 in various liquids
TABLE 10 swell heights in different liquids for examples 1-23 and comparative examples 1-6
TABLE 11. Water Permeability Length of application examples 1 to 25 and comparative application examples 1 to 7
As can be seen by combining example 1 and comparative examples 1 to 2 with tables 9 to 10, comparative example 1 is a common acrylic acid type water-absorbent resin which absorbs water well in water but absorbs water poorly in seawater having a salinity of 35% o, is only 1/8 of the water absorption in water, and has a swell height of about 1/5 of water, comparative example 2 is a nonionic polypropylene type water-absorbent resin, and comparative example 2 has increased water absorption and swell height in seawater having a salinity of 35% o, but has significantly decreased water absorption and swell height in water;
the water-blocking powder of the embodiment 1 forms a cross-linked structure which can obviously increase the water absorption capacity and the expansion height of the water-blocking powder in a salt solution, and the water-blocking powder is proved to have better water absorption and swelling effects in the salt solution; when the salinity of the seawater is increased, the seawater still has good water absorption and swelling effects; meanwhile, the water-blocking powder of the embodiment 1 has better water absorption and swelling effects in water and salt solution.
It can be seen from the combination of examples 1 to 9 and comparative examples 3 to 6 and from tables 9 to 10 that acrylic acid, lignosulfonate, urea and kaolin have a good water-absorbing swelling effect at the ratio of example 8, and the water-absorbing swelling effect is not good when the ratio exceeds the range.
As can be seen by combining examples 12-17 and tables 9-10, the moderate number average molecular weight of the sodium lignosulfonate and the moderate particle size of the kaolin are selected, so that the water absorption capacity and the swelling height of the water-blocking powder in seawater with different salinity can be remarkably improved.
As can be seen by combining examples 20-23 and tables 9-10, the water-blocking powder has better water-absorbing swelling effect in water and seawater with different salinity under proper processing conditions.
As can be seen from combination of application examples 1 to 25 and comparative application examples 1 to 6 and combination of table 11, the water penetration length of the waterproof cable was only slightly increased after the waterproof cable was immersed in the salt solution for 10 weeks, demonstrating that the waterproof durability of the waterproof cable was good.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The water-blocking powder for the waterproof cable is characterized by being prepared from the following raw materials in parts by weight:
80-130 parts of acrylic acid
20-40 parts of lignosulfonate
10-30 parts of urea
3-5 parts of kaolin
1-2 parts of initiator
0.3-0.7 part of cross-linking agent.
2. The water-blocking powder for a waterproof cable according to claim 1, characterized in that: the weight ratio of the acrylic acid to the lignosulfonate to the urea to the kaolin is 110:30:20: 4.
3. The water-blocking powder for a waterproof cable according to claim 1, characterized in that: the lignosulfonate is any one of calcium lignosulfonate, sodium lignosulfonate and magnesium lignosulfonate.
4. The water-blocking powder for a waterproof cable according to claim 1, characterized in that: the number average molecular weight of the lignosulfonate was 4000-.
5. The water-blocking powder for a waterproof cable according to claim 1, characterized in that: the average particle size of the kaolin is 300-500 nm.
6. The method for preparing a water-blocking powder for a waterproof cable according to any one of claims 1 to 5, comprising the steps of:
p1, adding acrylic acid into alkali liquor for neutralization, wherein the neutralization degree is 40-70mol%, and obtaining a pretreated acrylic acid solution;
p2, adding lignosulfonate, urea and an initiator into the pretreated acrylic acid solution, heating to 55-65 ℃ under the protection of nitrogen, and preserving heat for 1-2.5 hours to obtain a prefabricated liquid;
p3, adding kaolin and a cross-linking agent into the prepared liquid for ultrasonic dispersion, wherein the ultrasonic frequency is 30-50Hz, the ultrasonic time is 0.5-1h, and taking out the mixed liquid after the ultrasonic treatment;
and P4, dehydrating, drying and crushing the mixed solution to obtain the water-blocking powder.
7. The water-blocking powder for waterproof cables according to claim 6, characterized in that: in the step P1, the neutralization degree of acrylic acid and sodium hydroxide is 60 mol%.
8. The method for preparing the water-blocking powder for the waterproof cable according to claim 6, wherein the method comprises the following steps: the heat preservation time in the step P2 is 2 h.
9. The method for preparing the water-blocking powder for the waterproof cable according to claim 6, wherein the method comprises the following steps: the drying method in the step P4 is to dry the mixture at 100 ℃ for 1h and then at 60 ℃ for 2 h.
10. A waterproof cable comprising a waterproof layer (2), characterized in that the waterproof layer (2) is made of the water-blocking powder for a waterproof cable according to any one of claims 1 to 5.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115521557A (en) * | 2022-09-30 | 2022-12-27 | 威海市泓淋电力技术股份有限公司 | Preparation method of waterproof PVC cable sheath material for electric bicycle |
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