CN107936418B - Long-acting type rat bite prevention cable material and preparation method thereof - Google Patents
Long-acting type rat bite prevention cable material and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/04—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
- H01B3/443—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
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Abstract
The invention relates to the field of cable materials, in particular to a long-acting type rat bite prevention cable material and a preparation method thereof. The long-acting type rat bite preventing cable material is prepared by the following method that (1) gelatin and allyl isothiocyanate are dispersed in water to prepare mixed emulsion; (2) adding sodium carboxymethyl starch into the mixed emulsion obtained in the step (1) to perform flocculation precipitation; (3) spray drying the flocculated precipitate obtained in the step (2) to obtain a rat repelling microcapsule taking allyl isothiocyanate as a core and gelatin as a shell; (4) and (4) mixing the rat repelling microcapsule in the step (3) with matrix resin, and extruding to obtain the long-acting rat bite preventing cable material. The microcapsule structure of the long-acting type rat bite-proof cable material can protect allyl isothiocyanate from volatilizing and escaping easily, guarantee the long-acting property of a rat repelling effect, and effectively prevent fire accidents and economic losses caused by rat bite.
Description
Technical Field
The invention relates to the field of cable materials, in particular to a long-acting type rat bite prevention cable material and a preparation method thereof.
Background
Mice are one of three main hazards of damaging polyolefin sheathed cables and optical cables, and the sheath of the conventional low-smoke halogen-free polyolefin cable material has low flexibility, so that a plurality of cables are bitten and damaged by mice, a circuit short circuit causes fire disasters, a plurality of accidents are caused, and huge economic loss is brought. Therefore, the market urgently needs a cable material product with rat-proof performance. The prior art uses more toxic chemical reagents as a rat repelling agent, which not only pollutes the environment, but also has short duration and volatile effect.
The Chinese patent application with the application number of 201710636416.6 discloses a rat bite preventing cable sheath material which comprises the following raw materials in parts by weight: 60-80 parts of nitrile silicone rubber, 15-25 parts of butyl rubber, 30-40 parts of chlorosulfonated polyethylene, 1, 1-bis- (tert-butylperoxy) cyclohexane 1.5-2.5 parts, sodium ammonium dichromate 2-3 parts, filling reinforcing agent 115-125 parts, epoxy soybean oil 3-6 parts, dioctyl phthalate 2-4 parts, stearic acid 4-6 parts and anti-aging agent 2.5-4 parts. The filling reinforcing agent comprises the following components in parts by weight: 15-20 parts of starch compound, 30-40 parts of hard pottery clay, 20-30 parts of silk fiber, 8-16 parts of diatomite and 25-35 parts of fumed silica. The rat bite-proof cable sheath material provided by the invention has excellent rat bite-proof performance, avoids the occurrence of the situation that a cable is bitten by a rat, and has excellent tensile strength and wear-resistant effect and low cost.
The Chinese patent application with the application number of 201510090007.1 discloses a rat bite prevention environment-friendly cable formula which comprises the following raw materials in percentage by mass: 45-60% of PVC, 25-38% of plasticizer, 0.8-3.6% of environment-friendly calcium-zinc heat stabilizer, 8-16% of calcium carbonate, 0.15-0.4% of bright lubricant, 0.15-0.4% of stearic acid and 0.5-1.6% of environment-friendly plastic ratproof agent, wherein the n-pelargonic acid vanillylamide content in the environment-friendly plastic ratproof agent is more than or equal to 60.0%, the fineness of the environment-friendly plastic ratproof agent is less than or equal to 2%, and the environment-friendly plastic ratproof agent is in a shape of microcapsule, or plastic masterbatch; compared with the prior art, the invention has the advantages of mouse-proof performance, environment protection, ecological protection, economy and the like, avoids the cable from being bitten by mice, and ensures the quality requirement of the cable.
The Chinese patent application with the application number of 201110320154.5 discloses a rat bite preventing flame-retardant polyvinyl chloride wire and cable material, and belongs to the technical field of thermoplastic materials. The composite material is prepared from the following raw materials in parts by weight: 100-125 parts of polyvinyl chloride resin; 25-43 parts of a plasticizer; 50-70 parts of mineral filler; 5-10 parts of metal oxide; 10-20 parts of a flame retardant; 0.5-1 part of a rat-proof agent; 2-3 parts of a calcium-zinc compound stabilizer; 0.8-1.4 parts of antioxidant; 0.5-1 part of a lubricant. The flame-retardant polyvinyl chloride wire and cable material capable of preventing the rat bite has the following properties: the tensile strength is more than or equal to 12MPa, the elongation at break is more than or equal to 180 percent, the flame retardance can reach UL-94-V-0(1.6mm), and the wire can prevent rats from biting.
The Chinese patent application with the application number of 201510248780.6 discloses a mixing method of a rat bite prevention flame retardant TPU cable material, which is characterized in that a high-speed mixer is adopted to mix a particle state TPU raw material A, a liquid state TCEP flame retardant B, a liquid state DMMP flame retardant C, a powder state APP flame retardant D, a powder state zinc borate flame retardant E and a powder state capsaicin H according to a certain proportion. The mixing method of the rat bite prevention flame retardant TPU cable material has the advantages that the TPU material and the modifying material are uniformly mixed, and the binding force of the modifying agent on the TPU material is firm.
The Chinese patent application with the application number of 201410595930.6 discloses a special material for a communication cable sheath pipe preventing insects and rats from biting and a preparation method thereof, wherein the special material is prepared from the following raw materials in parts by weight: 52-76 parts of polypropylene, 31-43 parts of ethylene-chlorotrifluoroethylene copolymer, 3-6 parts of benzoic acid benzyl ester, 4-6 parts of allyl diglycol dicarbonate, 2-4 parts of cycloheximide, 3-5 parts of tetrabasic lead sulfate, 10-15 parts of dicyclohexyl phthalate, 16-22 parts of spherical quartz sand, 2-4 parts of triphenyltin acetate, 1.5-2.5 parts of m-chloroaniline, 5-10 parts of dibutyl azelate, 2-3 parts of diisodecyl phosphite, 4-8 parts of chlorinated paraffin, 8-14 parts of barium metatitanate, 5-10 parts of coated red phosphorus, 1-2 parts of phenethyl resorcinol and 4.5-6.5 parts of an auxiliary agent. The special material for the protective sleeve is added with the benzoic acid methyl ester, the triphenyl tin acetate, the m-chloroaniline and other substances, so that the insect and mouse bite prevention performance of the protective sleeve can be greatly improved, the damage of insects and mice to the protective sleeve is effectively prevented, the safety and normal operation of an optical cable are ensured, and the special material for the protective sleeve has excellent wear resistance, weather resistance, corrosion resistance and temperature resistance, long service life and wide application range.
The chinese patent application with application number 201510760715.1 discloses an anti-bite cable outer sheath, wherein the shell of the anti-bite cable outer sheath comprises the following components in parts by mass: 90-110 parts of polyvinyl chloride resin, 40-60 parts of calcium carbonate, 10-20 parts of dioctyl phthalate, 11-16 parts of chlorinated paraffin, 2-4 parts of composite stabilizer, 0.4-0.8 part of stearic acid, and 3-5 parts of rat bite prevention master batch 9074-FT-40. The formula is environment-friendly and safe, is nontoxic and harmless to human bodies and the environment, meets ecological requirements, well realizes the function of preventing mice from biting, and the prepared cable outer sheath is firm, durable, ageing-resistant, and good in flexibility, and can well realize the function of protecting cable cores.
The above patent prevents rats from biting the cable mainly by improving the strength, abrasion resistance, etc. of the cable material, but is still easily bitten by rats as it ages.
Disclosure of Invention
In view of the above drawbacks, a first object of the present invention is to provide a long-acting type rat-bite-preventing cable material, which has long-acting properties and effectively prevents rat from biting.
To achieve the first object, the material is prepared by (1) dispersing gelatin and allyl isothiocyanate in water to prepare a mixed emulsion; (2) adding sodium carboxymethyl starch into the mixed emulsion obtained in the step (1) to perform flocculation precipitation; (3) spray drying the flocculated precipitate obtained in the step (2) to obtain a rat repelling microcapsule taking allyl isothiocyanate as a core and gelatin as a shell; (4) and (4) mixing the rat repelling microcapsule in the step (3) with matrix resin, and extruding to obtain the long-acting rat bite preventing cable material.
The gelatin can be conventional commercially available gelatin, and is white or yellowish, semitransparent and slightly glossy thin slice or powder particles formed by partial degradation of collagen in connective tissues such as animal skin, bones, muscle membranes, fascians and the like; so it is also called animal gelatin and fat glue. The industrial gelatin is colorless to light yellow transparent or semitransparent flakes or particles. No smell and no odor. It swells in cold water, dissolves in hot water, in glycerol and acetic acid, and does not dissolve in ethanol and ether, and it is a macromolecular hydrophilic colloid.
Allyl isothiocyanate, also known as allyl isothiocyanate or allyl isothiocyanate, is a colorless to pale yellow oily liquid. Has an irritating mustard smell. It can bubble skin, is harmful to lung, and needs to be protected during production, and has a density of 1.0126, a boiling point of 152 deg.C, is slightly soluble in water, and is soluble in ethanol, diethyl ether and carbon disulfide. Can react and deteriorate when dissolved in ethanol.
The allyl isothiocyanate provided by the invention can be commercially available allyl isothiocyanate and can also be prepared, and the preparation method can adopt the existing methods, such as: dissolving allyl iodide or allyl bromide and potassium thiocyanate in ethanol, heating, adding water after potassium halide is completely separated out, separating out allyl isothiocyanate, and distilling and refining.
Sodium carboxymethyl starch, also known as carboxymethyl starch, is an anionic starch ether, a cold water soluble electrolyte. Has already been produced industrially. Is one kind of modified starch, belongs to ether type starch, and is one kind of water soluble anionic polymer compound. It is odorless, nontoxic, and not easy to mildew, and is easily soluble in water when the substitution degree is more than 0.2.
The commercially available sodium carboxymethyl starch includes food-grade sodium carboxymethyl starch, pharmaceutical-grade sodium carboxymethyl starch, paper-making-grade sodium carboxymethyl starch, building-industry-grade sodium carboxymethyl starch, ceramic-industry-grade sodium carboxymethyl starch, daily chemical-industry-grade sodium carboxymethyl starch, petroleum-industry-grade sodium carboxymethyl starch and printing and dyeing-industry-grade sodium carboxymethyl starch. Preferably, daily chemical industrial grade sodium carboxymethyl starch, food grade sodium carboxymethyl starch or pharmaceutical grade sodium carboxymethyl starch is adopted, before use, a small amount of water is used for soaking CMS (sodium carboxymethyl starch), and then water is added to prepare the concentration required by a user; the dissolution of the sodium carboxymethyl starch CMS can be accelerated by stirring and heating properly; in the process of using sodium carboxymethyl starch, a container which is easy to rust is not required to be used, and organic acid, inorganic acid and heavy metal ions are not required to be contacted or used together. While avoiding contact with high temperatures, the viscosity decreases as the temperature increases.
Spray drying is a method for applying systematic technology to material drying. After the thin material is atomized in the drying chamber, the water content is quickly vaporized in the contact of the thin material and hot air, and then the dried product is obtained. The method can directly dry the solution or emulsion into powder or granular product, and can omit the procedures of evaporation, pulverization, etc. The centrifugal spray drying method is preferably the centrifugal spray drying method, the centrifugal spray drying method utilizes a disc which rotates at a high speed in the horizontal direction to provide centrifugal force for the solution to be thrown out at a high speed to form a film, a filament or liquid drops, the tangential acceleration generated along the rotation of the disc and the radial acceleration generated by the centrifugal force are generated due to the functions of friction, obstruction and tearing of air, and consequently, the liquid moves on the disc at a combined speed, the track of the liquid is spiral, the liquid is thrown out from the disc along the spiral line, then the liquid drops are dispersed into tiny liquid drops which move along the diameter cutting direction of the disc at an average speed, and meanwhile, the liquid drops fall under the gravity of the earth center, and the sprayed particles are different in size. Therefore, the flying distances of the particles are different, so that the particles falling at different distances form a cylinder which is centrosymmetric with the rotating shaft, and the obtained liquid drops are uniform.
Preferably, the mass ratio of the gelatin, the allyl isothiocyanate and the water in the step (1) is as follows: 25-35: 5-12: 600-1000.
Preferably, the temperature of the dispersion in the step (1) is 45-85 ℃.
Preferably, the mass ratio of the sodium carboxymethyl starch to the gelatin is as follows: 50-199: 25 to 35.
Preferably, the matrix resin is at least one of polyvinyl chloride, ethylene-vinyl acetate copolymer, high-pressure polyethylene or thermoplastic polyurethane.
The performance of the polyvinyl chloride as the sheath of the electric wire and the cable is as follows: the flame-retardant rubber is not easy to burn, aging-resistant and impact-resistant, has excellent wear resistance, can resist oil, acid, alkali, bacteria, moisture, sunlight irradiation and the like, and has self-extinguishing performance on the action of flame; the polyvinyl chloride sheath has the lowest working temperature of-40 ℃ and high temperature resistance of 105 ℃.
Ethylene-vinyl acetate copolymers (EVA) are a class of thermoplastic with rubber-like elasticity, whose properties are strongly related to the content of Vinyl Acetate (VA), the smaller the VA, the more the high-pressure polyethylene, and the more the VA, the rubber. EVA exomorphic high-pressure polyethylene with low VA content, soft and good impact strength, and is suitable for manufacturing composite materials. EVA has good elasticity, low-temperature flexibility, chemical resistance and weather resistance. The EVA and the LDPE are copolymerized for use, so that the environmental cracking resistance, the impact resistance, the hardness and the adhesion between a conductor and an insulation of the LDPE can be improved.
Thermoplastic polyurethane is a newly developed soft and tough sheath material, has good toughness, strength, resistance to corrosion, chemical corrosion resistance and shock resistance, can keep flexibility in the range of-550 ℃ to +900 ℃, has good radiation resistance and is suitable for sealing, and the wear resistance is four times better than that of polyethylene and polyvinyl chloride. The PU elastomer is prepared from polyol in diisocyanate; the polyester type and the polyether type are divided; polyester polyols are used in the production of PU materials having high requirements for tear strength, load-bearing capacity, heat resistance, chemical resistance and resistance to UV radiation. The polyether glycol can make the material have better low temperature, hydrolysis resistance and feature resistance.
The addition amount of the rat repelling microcapsule is too much, the strength of a cable material can be influenced to a certain extent, too little rat repelling microcapsule is added, and the long-acting rat bite preventing effect cannot be achieved, and a large number of experiments show that the mass ratio of the matrix resin to the rat repelling microcapsule is 100-125: 5-19 hours, the strength of the cable material is less affected, and the cable material can better play a role in long-acting rat bite prevention, so that the preferable mass ratio of the matrix resin to the rat repelling microcapsule is 100-125: 5 to 19.
Preferably, the matrix resin is high-pressure polyethylene and thermoplastic polyurethane, and the mass ratio of the high-pressure polyethylene to the thermoplastic polyurethane is 1-5: 25-75.
The second purpose to be achieved by the invention is to provide a preparation method of the long-acting type rat-bite-preventing cable material, which comprises the following steps of (1) dispersing gelatin and allyl isothiocyanate in water to prepare mixed emulsion; (2) adding sodium carboxymethyl starch into the mixed emulsion obtained in the step (1) to perform flocculation precipitation; (3) spray drying the flocculated precipitate obtained in the step (2) to obtain a rat repelling microcapsule taking allyl isothiocyanate as a core and gelatin as a shell; (4) and (4) mixing the rat repelling microcapsule in the step (3) with matrix resin, and extruding to obtain the long-acting rat bite preventing cable material.
Has the advantages that: the invention disperses glutin and allyl isothiocyanate in water to prepare mixed emulsion, and then adds sodium carboxymethyl starch to carry out flocculation precipitation; spray drying the flocculated precipitate to obtain rat repelling microcapsule with allyl isothiocyanate as core and gelatin as shell; the long-acting type rat-bite-preventing cable material has the remarkable effects that the microcapsule structure can protect allyl isothiocyanate from volatilizing and escaping easily, the long-acting property of a rat repelling effect is ensured, and fire accidents and economic losses caused by rat bite are effectively prevented; further effectively inhibiting the proliferation of mould and preparing the cable for humid environments such as indoor and basement.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
Example 1
(1) Dispersing 250g of gelatin and 60g of allyl isothiocyanate in 6Kg of water at the temperature of 45 ℃ to prepare mixed emulsion; (2) adding 550g of sodium carboxymethyl starch into the mixed emulsion in the step (1) for flocculation and precipitation; (3) carrying out centrifugal spray drying on the flocculated precipitate obtained in the step (2) to obtain the rat repelling microcapsule which is uniform in size and takes allyl isothiocyanate as a core and gelatin as a shell; (4) and (3) mixing 400g of the rat repelling microcapsule in the step (3) with 8Kg of polyvinyl chloride-based resin, and extruding to obtain the long-acting rat bite preventing cable material.
The prepared long-acting rat bite-proof cable material is placed outdoors for 1 year, then is placed into a mouse cage, 4 rats which are starved for 24 hours (namely, rats which are not fed for 24 hours) are placed into the mouse cage, and the biting condition of the cable material is observed, and the result is detailed in table 1.
Example 2
(1) Dispersing 260g of gelatin and 70g of allyl isothiocyanate in 7Kg of water at the temperature of 50 ℃ to prepare mixed emulsion; (2) adding 550g of sodium carboxymethyl starch into the mixed emulsion in the step (1) for flocculation and precipitation; (3) carrying out centrifugal spray drying on the flocculated precipitate obtained in the step (2) to obtain the rat repelling microcapsule which is uniform in size and takes allyl isothiocyanate as a core and gelatin as a shell; (4) and (3) mixing 400g of the rat repelling microcapsule in the step (3) with 8Kg of polyvinyl chloride-based resin, and extruding to obtain the long-acting rat bite preventing cable material.
The prepared long-acting rat bite-proof cable material is placed outdoors for 1 year, then is placed into a mouse cage, 4 rats which are starved for 24 hours (namely, rats which are not fed for 24 hours) are placed into the mouse cage, and the biting condition of the cable material is observed, and the result is detailed in table 1.
Example 3
(1) Dispersing 270g of gelatin and 80g of allyl isothiocyanate in 8Kg of water at the temperature of 55 ℃ to prepare mixed emulsion; (2) adding 550g of sodium carboxymethyl starch into the mixed emulsion in the step (1) for flocculation and precipitation; (3) carrying out centrifugal spray drying on the flocculated precipitate obtained in the step (2) to obtain the rat repelling microcapsule which is uniform in size and takes allyl isothiocyanate as a core and gelatin as a shell; (4) and (3) mixing 400g of the rat repelling microcapsule in the step (3) with 8Kg of polyvinyl chloride-based resin, and extruding to obtain the long-acting rat bite preventing cable material.
The prepared long-acting rat bite-proof cable material is placed outdoors for 1 year, then is placed into a mouse cage, 4 rats which are starved for 24 hours (namely, rats which are not fed for 24 hours) are placed into the mouse cage, and the biting condition of the cable material is observed, and the result is detailed in table 1.
Example 4
(1) Dispersing 280g of gelatin and 90g of allyl isothiocyanate in 9Kg of water at the temperature of 60 ℃ to prepare mixed emulsion; (2) adding 550g of sodium carboxymethyl starch into the mixed emulsion in the step (1) for flocculation and precipitation; (3) carrying out centrifugal spray drying on the flocculated precipitate obtained in the step (2) to obtain the rat repelling microcapsule which is uniform in size and takes allyl isothiocyanate as a core and gelatin as a shell; (4) and (3) mixing 400g of the rat repelling microcapsule in the step (3) with 8Kg of polyvinyl chloride-based resin, and extruding to obtain the long-acting rat bite preventing cable material.
The prepared long-acting rat bite-proof cable material is placed outdoors for 1 year, then is placed into a mouse cage, 4 rats which are starved for 24 hours (namely, rats which are not fed for 24 hours) are placed into the mouse cage, and the biting condition of the cable material is observed, and the result is detailed in table 1.
Example 5
(1) 290g of gelatin and 100g of allyl isothiocyanate are dispersed in 9Kg of water with the temperature of 65 ℃ to prepare mixed emulsion; (2) adding 550g of sodium carboxymethyl starch into the mixed emulsion in the step (1) for flocculation and precipitation; (3) carrying out centrifugal spray drying on the flocculated precipitate obtained in the step (2) to obtain the rat repelling microcapsule which is uniform in size and takes allyl isothiocyanate as a core and gelatin as a shell; (4) and (3) mixing 400g of the rat repelling microcapsule in the step (3) with 8Kg of polyvinyl chloride-based resin, and extruding to obtain the long-acting rat bite preventing cable material.
The prepared long-acting rat bite-proof cable material is placed outdoors for 1 year, then is placed into a mouse cage, 4 rats which are starved for 24 hours (namely, rats which are not fed for 24 hours) are placed into the mouse cage, and the biting condition of the cable material is observed, and the result is detailed in table 1.
Example 6
(1) 300g of gelatin and 110g of allyl isothiocyanate are dispersed in 8Kg of water with the temperature of 65 ℃ to prepare mixed emulsion; (2) adding 550g of sodium carboxymethyl starch into the mixed emulsion in the step (1) for flocculation and precipitation; (3) carrying out centrifugal spray drying on the flocculated precipitate obtained in the step (2) to obtain the rat repelling microcapsule which is uniform in size and takes allyl isothiocyanate as a core and gelatin as a shell; (4) and (3) mixing 400g of the rat repelling microcapsule in the step (3) with 8Kg of polyvinyl chloride-based resin, and extruding to obtain the long-acting rat bite preventing cable material.
The prepared long-acting rat bite-proof cable material is placed outdoors for 1 year, then is placed into a mouse cage, 4 rats which are starved for 24 hours (namely, rats which are not fed for 24 hours) are placed into the mouse cage, and the biting condition of the cable material is observed, and the result is detailed in table 1.
Example 7
(1) Dispersing 310g of gelatin and 120g of allyl isothiocyanate in 8Kg of water at the temperature of 70 ℃ to prepare mixed emulsion; (2) adding 650g of sodium carboxymethyl starch into the mixed emulsion in the step (1) for flocculation and precipitation; (3) carrying out centrifugal spray drying on the flocculated precipitate obtained in the step (2) to obtain the rat repelling microcapsule which is uniform in size and takes allyl isothiocyanate as a core and gelatin as a shell; (4) and (3) mixing 400g of the rat repelling microcapsule in the step (3) with 9Kg of polyvinyl chloride-based resin, and extruding to obtain the long-acting rat bite preventing cable material.
The prepared long-acting rat bite-proof cable material is placed outdoors for 1 year, then is placed into a mouse cage, 4 rats which are starved for 24 hours (namely, rats which are not fed for 24 hours) are placed into the mouse cage, and the biting condition of the cable material is observed, and the result is detailed in table 1.
Comparative example 1
(1) Dispersing 120g of allyl isothiocyanate in 8Kg of water at the temperature of 70 ℃ to prepare mixed emulsion; (2) adding 650g of sodium carboxymethyl starch into the mixed emulsion in the step (1) for flocculation and precipitation; (3) carrying out centrifugal spray drying on the flocculation precipitation in the step (2) to obtain uniform allyl isothiocyanate powder; (4) and (3) mixing 400g of the powder in the step (3) with 9Kg of ethylene-vinyl acetate matrix resin, and extruding to obtain the long-acting rat bite prevention cable material.
The prepared long-acting rat bite-proof cable material is placed outdoors for 1 year, then is placed into a mouse cage, 4 rats which are starved for 24 hours (namely, rats which are not fed for 24 hours) are placed into the mouse cage, and the biting condition of the cable material is observed, and the result is detailed in table 1.
Comparative example 2
(1) Dispersing 110g of allyl isothiocyanate in 8Kg of water at the temperature of 65 ℃ to prepare mixed emulsion; (2) carrying out centrifugal spray drying on the emulsion obtained in the step (2) to obtain a powder material; (3) and (3) mixing 400g of the powder dividing material in the step (2) with 9Kg of ethylene-vinyl acetate matrix resin, and extruding to obtain the long-acting rat-bite-preventing cable material.
The prepared rat bite-proof cable material was put into a mouse cage, 4 rats which had been starved for 24 hours (i.e., rats which had not been fed for 24 hours) were put into the mouse cage, and the biting condition of the cable material was observed, and the results are detailed in table 1.
TABLE 1 cases of seized cable materials of examples and comparative examples
| Numbering | 24h bite |
| Example 1 | Faint scar and mouse death |
| Example 2 | Faint scar and mouse death |
| Example 3 | Faint scar and mouse death |
| Example 4 | Faint scar and mouse death |
| Example 5 | Faint scar and mouse death |
| Example 6 | Faint scar and mouse death |
| Example 7 | Faint scar and mouse death |
| Comparative example 1 | Broken cable and mouse not dead |
| Comparative example 2 | Broken cable and mouse not dead |
Claims (10)
1. The long-acting type rat bite prevention cable material is characterized by being prepared by the following method:
(1) dispersing gelatin and allyl isothiocyanate in water to prepare mixed emulsion;
(2) adding sodium carboxymethyl starch into the mixed emulsion obtained in the step (1) to perform flocculation precipitation;
(3) spray drying the flocculated precipitate obtained in the step (2) to obtain a rat repelling microcapsule taking allyl isothiocyanate as a core and gelatin as a shell;
(4) and (4) mixing the rat repelling microcapsule in the step (3) with matrix resin, and extruding to obtain the long-acting rat bite preventing cable material.
2. The long-acting type rat-bite-preventing cable material as claimed in claim 1, wherein the mass ratio of the gelatin, the allyl isothiocyanate and the water in the step (1) is as follows: 25-35: 5-12: 600-1000.
3. The long-acting type rat-bite-preventing cable material as claimed in claim 1 or 2, wherein the temperature of the dispersion in the step (1) is 45-85 ℃.
4. The long-acting type rat-bite-preventing cable material as claimed in claim 1 or 2, wherein the mass ratio of the sodium carboxymethyl starch to the gelatin is as follows: 50-199: 25 to 35.
5. The long-acting type rat bite prevention cable material according to claim 3, wherein the mass ratio of the sodium carboxymethyl starch to the gelatin is as follows: 50-199: 25 to 35.
6. The long-acting type rat bite-proof cable material as claimed in claim 1 or 2, wherein the spray drying method is a centrifugal spray drying method.
7. The long-acting type rat-bite-preventing cable material as claimed in claim 1 or 2, wherein the matrix resin is at least one of polyvinyl chloride, ethylene-vinyl acetate copolymer, high-pressure polyethylene or thermoplastic polyurethane.
8. The long-acting type rat bite-preventing cable material according to claim 7, wherein the mass ratio of the matrix resin to the rat repelling microcapsule is 100-125: 5 to 19.
9. The long-acting type rat bite-proof cable material according to claim 8, wherein the matrix resin is high-pressure polyethylene and thermoplastic polyurethane, and the mass ratio of the high-pressure polyethylene to the thermoplastic polyurethane is 1-5: 25-75.
10. A preparation method of a long-acting type rat bite prevention cable material is characterized by comprising the following steps of (1) dispersing gelatin and allyl isothiocyanate in water to prepare mixed emulsion; (2) adding sodium carboxymethyl starch into the mixed emulsion obtained in the step (1) to perform flocculation precipitation; (3) spray drying the flocculated precipitate obtained in the step (2) to obtain a rat repelling microcapsule taking allyl isothiocyanate as a core and gelatin as a shell; (4) and (4) mixing the rat repelling microcapsule in the step (3) with matrix resin, and extruding to obtain the long-acting rat bite preventing cable material.
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| CN108586907A (en) * | 2018-05-11 | 2018-09-28 | 合肥博创机械制造有限公司 | A kind of CABLE MATERIALS containing the stink agent of triggering property |
| CN115584169A (en) * | 2022-09-27 | 2023-01-10 | 英德市东顺精细化工实业有限公司 | Rat repelling foam for preventing rat bite |
| CN116721801B (en) * | 2023-06-15 | 2023-12-01 | 广州澳兴光电传输科技股份有限公司 | Cable with prevent gnawing and stings function |
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| CN104693083A (en) * | 2013-12-06 | 2015-06-10 | 沈阳有色金属研究院 | Improved preparation method of allyl thiocarbamate |
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| CN105670181A (en) * | 2016-04-12 | 2016-06-15 | 苏州科茂电子材料科技有限公司 | Radiation-resistant and folding-resistant cable and preparation method thereof |
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Effective date of registration: 20191230 Address after: 523000 Shigu Gang Industrial Zone, Huang Cun, Humen Town, Dongguan, Guangdong Applicant after: DONGGUAN EVER UNITED ELECTRIC WIRE & CABLE CO., LTD. Address before: Qingyang District of Chengdu City, Sichuan province 610091 Dragon Industrial Port East Road 4 Applicant before: Chengdu Xinkeli Chemical Sci-Tech Co., Ltd. |
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