CN112538310B - Flexible epoxy acrylate UV curing coating and application thereof in cable joint - Google Patents
Flexible epoxy acrylate UV curing coating and application thereof in cable joint Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
- C09D163/10—Epoxy resins modified by unsaturated compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/14—Polycondensates modified by chemical after-treatment
- C08G59/1433—Polycondensates modified by chemical after-treatment with organic low-molecular-weight compounds
- C08G59/1438—Polycondensates modified by chemical after-treatment with organic low-molecular-weight compounds containing oxygen
- C08G59/1455—Monocarboxylic acids, anhydrides, halides, or low-molecular-weight esters thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/14—Polycondensates modified by chemical after-treatment
- C08G59/1433—Polycondensates modified by chemical after-treatment with organic low-molecular-weight compounds
- C08G59/1438—Polycondensates modified by chemical after-treatment with organic low-molecular-weight compounds containing oxygen
- C08G59/1455—Monocarboxylic acids, anhydrides, halides, or low-molecular-weight esters thereof
- C08G59/1461—Unsaturated monoacids
- C08G59/1466—Acrylic or methacrylic acids
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/14—Polycondensates modified by chemical after-treatment
- C08G59/1433—Polycondensates modified by chemical after-treatment with organic low-molecular-weight compounds
- C08G59/1438—Polycondensates modified by chemical after-treatment with organic low-molecular-weight compounds containing oxygen
- C08G59/1455—Monocarboxylic acids, anhydrides, halides, or low-molecular-weight esters thereof
- C08G59/1461—Unsaturated monoacids
- C08G59/1472—Fatty acids
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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Abstract
A flexible epoxy acrylate UV curable coating and its use in cable joints, the coating comprising the following ingredients: photosensitive resin, a photoinitiator and an active diluent, wherein the photosensitive resin comprises graft modified epoxy acrylate and polycondensation modified epoxy acrylate, the modifier of the graft modified epoxy acrylate is perfluoroalkoyl chloride, and the polycondensation modified epoxy acrylate is obtained by polycondensation of dimer fatty acid, epoxy resin and acrylic acid. The photosensitive resin in the coating is a compound composition of the epoxy acrylate grafted and modified by the perfluoroalkanoyl chloride and the epoxy acrylate polycondensation modified by the dimer fatty acid, and a finally cured coating film has the advantages of good flexibility, small shrinkage, difficulty in expansion or shrinkage cracking, difficulty in pulverization, excellent aging resistance and suitability for soft materials such as cable heads and the like.
Description
Technical Field
The invention belongs to the field of ultraviolet curing coatings, and particularly relates to a flexible epoxy acrylate UV curing coating and application thereof.
Background
The cable head is an intermediate joint for connecting a section of cable into a continuous line, and is very fragile, so that once water enters carelessly, the line breaks down and the whole line trips; and the material can explode to seriously threaten the safety of equipment and personnel, so that reliable sealing treatment is required. After the UV coating is coated, a coating film excites an initiator to decompose under the irradiation of ultraviolet light to generate free radicals to initiate resin reaction, and the UV coating is instantly cured to form a film, has good functions of insulation, water resistance, fire resistance, mildew resistance and the like, and is a good coating for insulating and sealing a cable head.
The UV coating mainly comprises photosensitive resin, a photoinitiator, a diluent and various additives. Photosensitive resins are film-forming materials for coatings, and their properties determine the main properties of the coatings after curing. Among many photosensitive resins, epoxy acrylate, which is one of the resins having properties closest to the requirements of cable head insulation sealing, can provide sufficient hardness, and has excellent water resistance, hot water resistance, corrosion resistance, adhesion and other properties, for example, patent CN201510675143.7 discloses a transparent repair primer for LED-UV woodware and a preparation method thereof, which comprises the following components in percentage by weight: 20-30% of epoxy acrylate resin; 5-10% of pure acrylate resin; 8-12% of special functional acrylate resin; 25-30% of monomers; 8-10% of a photoinitiator; 0.5 to 1 percent of anti-settling agent; 0.3 to 0.5 percent of wetting dispersant; 11-20% of a filler; patent CN201610707084.1 discloses a UV LED low-energy curing mahogany furniture coating and a preparation method thereof, and the preparation method comprises the following steps: 23-27 parts of a polyurethane acrylate oligomer; 24-28 parts of epoxy acrylate oligomer; 15-19 parts of trimethylolpropane triacrylate; 0.1-0.5 parts of fumed silica; 2-4 parts of a photoinitiator; 3-7 parts of an active ammonia co-initiator; 20-25 parts of filling powder; 0.4-0.6 part of assistant. In the above patents, epoxy acrylate is used as photosensitive resin, and the prepared coating has excellent mechanical and chemical resistance, but it is not difficult to find that they all have the same defects: the coating film is brittle and poor in flexibility, is easy to degrade, break and pulverize, has large shrinkage rate after curing, and is easy to expand or shrink and crack when being used in a cable head which is a service environment with large temperature and humidity changes, particularly when being connected with soft and easily-deformable base materials such as PVC, PE and nylon cable sheaths or cable heads, so that the circuit has great potential safety hazards.
In summary, there is a need for improvement of uv curable coatings using epoxy acrylate as the main photosensitive resin, so as to develop a coating with good flexibility, aging resistance and non-degradation property, which is suitable for flexible materials such as cable heads.
Disclosure of Invention
Aiming at the technical problems, the invention aims to provide a coating, wherein the grafting modified epoxy acrylate prepared by utilizing the substitution reaction of acyl chloride of perfluoroalkanoyl chloride and hydroxyl on epoxy acrylate has a hydrophobic perfluoroalkyl side chain, the polarity of the perfluoroalkyl side chain is higher than that of the hydroxyl, the coating has the function of a molecular chain lubricant, the interaction force among epoxy acrylate molecules can be reduced, the system viscosity is reduced, and the molecular flexibility is improved. In addition, the hydrophobic perfluoroalkyl side chain can protect the main chain, and improve the water resistance, aging resistance and acid and alkali resistance of the coating film. The main chain of the epoxy acrylate modified by the condensation polymerization of the dimerized fatty acid is added with the flexible connecting section, so that the flexibility of a coating film can be increased, but the molecular weight is also increased, so that the viscosity of the coating is higher.
In order to achieve the purpose, the invention adopts the specific technical scheme that:
a flexible epoxy acrylate UV-curable coating comprises the following raw materials: the photosensitive resin comprises graft modified epoxy acrylate and polycondensation modified epoxy acrylate, wherein a modifier of the graft modified epoxy acrylate is perfluoroalkoyl chloride, and the polycondensation modified epoxy acrylate is obtained by polycondensation of dimer fatty acid, epoxy resin and acrylic acid.
A flexible epoxy acrylate UV curing coating comprises the following raw materials in parts by weight: 100 parts of photosensitive resin, 1-5 parts of photoinitiator and 30-50 parts of reactive diluent, wherein the photosensitive resin comprises graft modified epoxy acrylate and polycondensation modified epoxy acrylate, and the weight ratio of the graft modified epoxy acrylate to the polycondensation modified epoxy acrylate is 0.3-0.5: 1.
The carbon atom number in the perfluoroalkanoyl chloride is 5-10, and the perfluoroalkanoyl chloride is specifically selected from at least one of perfluorovaleryl fluoride, perfluorohexanoyl fluoride, perfluoroheptanoyl fluoride, perfluorooctanoyl chloride, perfluorononanoyl chloride and perfluorodecanoyl chloride.
The grafting rate of the graft modified epoxy acrylate is 20-40%.
The polycondensation modified epoxy acrylate is obtained by using dimeric fatty acid to replace partial acrylic acid to participate in the polycondensation of epoxy resin and acrylic acid, wherein the molar ratio of the dimeric fatty acid to the epoxy resin to the acrylic acid is 0.07-0.1:1: 1.7-1.9.
The preparation method of the graft modified epoxy acrylate comprises the following steps:
s1, adding epoxy acrylate, a catalyst and a solvent into a reaction kettle, heating, dropwise adding perfluoroalkanoyl chloride under the condition of constant-temperature stirring, and keeping constant temperature to continue reacting;
s2, cooling the reaction kettle to room temperature, filtering to remove triethylamine hydrochloride, washing residues with alkali liquor, and washing with water to be neutral;
and S3, distilling under reduced pressure to remove the solvent and residual perfluoroalkanoyl chloride to obtain the graft modified epoxy acrylate.
The epoxy acrylate used in step S1 is not particularly limited, and may be one commonly used in the art, including but not limited to bisphenol a type epoxy acrylate; the catalyst is triethylamine; the solvent is not particularly limited and is commonly used in the art, including but not limited to xylene; the dropping time of the perfluoroalkanoyl chloride is 0.5-1 h; the temperature rise is 70-90 ℃, and the reaction time is 12-24 h.
The alkali liquor in the step S2 is 3-5wt% sodium hydroxide or potassium hydroxide aqueous solution.
The preparation method of the polycondensation modified epoxy acrylate is a conventional preparation method in the field, and comprises the following steps:
under the inert atmosphere, adding epoxy resin and an organic solvent into a reaction kettle, heating, adding dimeric fatty acid and a catalyst, uniformly stirring, firstly keeping constant temperature reaction, when the acid value is less than 10mg/KOH/g, cooling, adding a polymerization inhibitor, dropwise adding acrylic acid, secondly keeping constant temperature reaction, when the acid value is less than 10mg/KOH/g, stopping reaction, and decompressing and distilling the solvent to obtain viscous polycondensation modified epoxy acrylate.
The organic solvent is not particularly limited and is commonly used in the art, including but not limited to toluene; heating to 90-120 ℃; the catalyst is not particularly limited and is commonly used in the art and includes, but is not limited to, tetrabutylammonium bromide; the constant temperature reaction time is kept for 1-5h for the first time; the temperature is reduced to 80-100 ℃; the polymerization inhibitor is not particularly limited, and is commonly used in the art, and includes but is not limited to at least one of hydroquinone and p-hydroxyanisole; the dripping time of the acrylic acid is 0.5-1 h; the secondary constant temperature reaction time is 3-10 h.
The dimer fatty acid is obtained by polymerizing unsaturated fatty acid, preferably oleic acid and linoleic acid through mutual polymerization, and has an acid value of 190-200 mgKOH/g.
The epoxy resin is bisphenol A epoxy resin with an epoxy value of 0.40-0.54, and comprises at least one of E-42, E-44 and E-51.
The polycondensation modified epoxy acrylate is prepared by introducing unsaturated double bonds into the molecular main chain of epoxy resin and matching with a diluent with the functionality of more than or equal to 2, and has the effects of improving the photocuring speed, generating a network structure polymer with high crosslinking density and keeping the hardness from being greatly reduced. The reactive diluent is a multifunctional reactive diluent, which is not particularly limited, and may be commonly used in the art, and includes, but is not limited to, at least one of trimethylolpropane triacrylate, pentaerythritol triacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, polyethylene glycol diacrylate, 1, 6-hexanediol acrylate, diethylene glycol diacrylate phthalate, propoxylated trimethylolpropane triacrylate, and pentaerythritol tetraacrylate.
Generally, the UV light-cured coating has good adhesion on a PVC material due to large polarity, but the adhesion on a PE material cannot meet the requirement. The photosensitive resin comprises graft modified epoxy acrylate and polycondensation modified epoxy acrylate, and the two can play a synergistic role, change the polarity of the photosensitive resin, obviously improve the adhesive force of the coating on a PE material, have no obvious adverse effect on the adhesive force on a PVC material, and widen the application field of the UV photocuring coating.
The photoinitiator is not particularly limited, and may be an initiator that can generate free radicals under ultraviolet light commonly used in the art, including but not limited to at least one of benzoin and derivatives thereof, acetophenone and derivatives thereof, aromatic ketone compounds, and acyl phosphorous oxide.
The invention also provides the application of the coating in a cable joint, which comprises the following steps: adding photosensitive resin, a photoinitiator and an active diluent which are coating components into a stirrer, uniformly stirring, coating the mixture on the surface of a clean and dry substrate, and curing under the irradiation of ultraviolet light to obtain a coating film.
Compared with the prior art, the invention has the beneficial effects that:
the photosensitive resin in the coating is a compound composition of epoxy acrylate grafted and modified by perfluoroalkyl acyl chloride and epoxy acrylate polycondensation modified by dimer fatty acid, and a finally cured coating film has the advantages of good flexibility, small shrinkage, difficulty in expansion or shrinkage cracking, difficulty in pulverization, excellent aging resistance and suitability for soft materials such as cable joints and the like.
Secondly, the inventors unexpectedly discover that the two modified epoxy acrylates have the function of synergistically improving the adhesion between the coating and the PE material.
The paint is convenient to construct, high in efficiency, good in safety and free of VOC volatilization.
Detailed Description
The present invention will be further described with reference to the following examples, but the present invention is not limited to the descriptions in the following. Unless otherwise specified, "parts" in the examples of the present invention are parts by weight. All reagents used are commercially available in the art.
The perfluoroalkanoyl chloride used in the invention is purchased from SigmaAldrich in America; SM6104Y bisphenol a type epoxy acrylate available from sambucus chinensis; the dimerized fatty acid was octadecadienoic acid dimer, available from Wuhan Fengtai Wis.Tech Co., Ltd.
Preparation of graft-modified epoxy acrylate
Preparation example 1
S1, sequentially adding 100 parts of Jiangsu Sanmu SM6104Y bisphenol A epoxy acrylate, 15 parts of triethylamine and 200 parts of dimethylbenzene into a reaction kettle, heating to 90 ℃, dropwise adding 27 parts of perfluorovaleryl chloride under the condition of constant-temperature stirring, and keeping constant temperature for continuous reaction for 12 hours after dropwise adding is finished for 0.5 hour;
s2, cooling the reaction kettle to room temperature, filtering to remove triethylamine hydrochloride, washing residues with 5wt% of sodium hydroxide aqueous solution, and then washing with water to be neutral;
and S3, carrying out reduced pressure distillation to remove the solvent xylene and residual perfluorovaleryl chloride to obtain the liquid graft modified epoxy acrylate.
Preparation example 2
The procedure was repeated, except that 58 parts of perfluorovaleryl chloride was used in step S1, in the same manner as in preparation example 1.
Preparation example 3
The procedure was repeated, except that 12 parts of perfluorovaleryl chloride was used in step S1, in the same manner as in preparation example 1.
Preparation example 4
The procedure was repeated, except that 66 parts of perfluorovaleryl chloride was used in step S1, in the same manner as in preparation example 1.
The graft ratio was determined gravimetrically, according to the following formula, and the results are shown in Table 1:
g-grafting rate;
m1-the weight of the modified epoxy acrylate;
m0-weight of epoxy acrylate.
TABLE 1
| Item | Percent of grafting% |
| Preparation example 1 | 21.2 |
| Preparation example 2 | 40.5 |
| Preparation example 3 | 9.5 |
| Preparation example 4 | 44.6 |
Preparation of polycondensation modified epoxy acrylate
Preparation example 5
Adding 46 parts by weight of E-44 and 80 parts by weight of toluene into a reaction kettle in a nitrogen atmosphere, heating to 95 ℃, adding 5.6 parts by weight of octadecadienoic acid dimer (the molar ratio of the octadecadienoic acid dimer to the E-44 is 0.1:1) and 0.4 part by weight of tetrabutylammonium bromide, uniformly stirring, firstly keeping constant temperature for 3 hours for reaction, cooling to 80 ℃ when the acid value is less than 10mg/KOH/g, adding 0.8 part by weight of hydroquinone, dropwise adding 12.3 parts by weight of acrylic acid (the molar ratio of acid to ester is 1.7:1) after 0.5 hour is finished, secondly keeping constant temperature for reaction for 5 hours when the acid value is less than 10mg/KOH/g, and distilling the toluene under reduced pressure to obtain viscous polycondensation modified epoxy acrylate.
Preparation example 6
The procedure of preparation example 5 was repeated, except that E-44 was used in an amount of 46 parts by weight and the amount of octadecadienoic acid dimer was used in an amount of 4 parts by weight, i.e., the molar ratio of octadecadienoic acid dimer to E-44 to acrylic acid was 0.07:1: 1.7.
Application example 1
33.3 parts of the graft-modified epoxy acrylate prepared in preparation example 1, 66.7 parts of the polycondensation-modified epoxy acrylate prepared in preparation example 5, 5 parts of 2,4,6, -trimethylbenzoyldiphenylphosphine oxide and 45 parts of diethylene glycol diacrylate phthalate are added into a stirrer, uniformly stirred and coated on the surface of clean and dried PE, the wet film thickness is 0.2-0.3mm, and the mixture is cured under the irradiation of ultraviolet light of 130mW/cm2 for 75s to obtain a coating film.
Application example 2
The rest of the reaction solution was the same as in application example 1, except that the amount of the graft-modified epoxy acrylate was 23.1 parts and the amount of the polycondensation-modified epoxy acrylate was 76.9 parts.
Application example 3
The rest of the reaction solution was the same as in application example 1, except that the amount of the graft-modified epoxy acrylate was 9.1 parts and the amount of the polycondensation-modified epoxy acrylate was 90.9 parts.
Application example 4
The rest of the reaction solution was the same as in application example 1, except that the amount of the graft-modified epoxy acrylate was 44.4 parts and the amount of the polycondensation-modified epoxy acrylate was 55.6 parts.
Application example 5
The rest was the same as in application example 1, except that perfluorovaleryl chloride was replaced with perfluorodecanoyl chloride.
Application example 6
The same as in application example 1 except that the grafted epoxy acrylate used was prepared in preparation example 2 and the polycondensation modified epoxy acrylate was prepared in preparation example 6.
Application example 7
The same as in application example 1 except that the grafted epoxy acrylate used was prepared in preparation example 3 and the polycondensation modified epoxy acrylate was prepared in preparation example 5.
Application example 8
The same as in application example 1 except that the grafted epoxy acrylate was prepared as in preparation example 4 and the polycondensation modified epoxy acrylate was prepared as in preparation example 5.
Comparative application example 1
The rest was the same as in application example 1, except that the photosensitive resin was composed of 33.3 parts of epoxy acrylate of SM6104Y bisphenol A type prepared by Sanmu Jiangsu, 66.7 parts of the polycondensation modified epoxy acrylate prepared in preparation example 5.
Comparative application example 2
The rest was the same as in application example 1, except that the photosensitive resin was composed of 33.3 parts of the graft-modified epoxy acrylate prepared in preparation example 1, and 66.7 parts of Jiangsu Sanmu SM6104Y bisphenol A type epoxy acrylate.
Comparative application example 3
The rest is the same as the application example 1, except that the epoxy acrylate used is not modified, and the amount is 100 parts.
The following performance tests were performed on the above coating, and the test results are shown in table 2:
adhesion force: the test was carried out with reference to the standard GB/T9286-1998 paint and varnish cross-cut test, the substrates being PE, PVC.
Viscosity: the test was performed with a viscosity meter, referred to standard SN/T3369-.
Flexibility: a paint film flexibility determination method GB/T1731-93.
Volume shrinkage: measuring the density rho of the coating before and after curing by using an electronic balance1、ρsThe volume shrinkage was calculated with reference to the following formula:
aging resistance: the mechanical property retention rate of the coating is measured by an SN-type xenon lamp weather-resistant tester, a light source is 6kw water-cooling xenon lamp, the air temperature (45 +/-2) DEG C, the relative humidity (75 +/-5) DEG C and the rainfall period in the tester are 15min/h, the light source continuously irradiates for 800h, and the standard GB/T13022-91 'plastic film tensile property test method' is referred.
TABLE 2
The photosensitive resin in the coating is a compound composition of the epoxy acrylate grafted and modified by the perfluoroalkanoyl chloride and the epoxy acrylate polycondensation modified by the dimer fatty acid, and a finally cured coating film has the advantages of good flexibility, small shrinkage, difficulty in expansion or shrinkage cracking, difficulty in pulverization, excellent aging resistance and suitability for soft materials such as cable heads and the like.
The inventors have unexpectedly found that two modified epoxy acrylates have a synergistic effect in improving the adhesion of the coating to PE materials.
The coating disclosed by the invention is convenient to construct, high in efficiency, good in safety and free of VOC volatilization.
The above detailed description is specific to one possible embodiment of the present invention, and the embodiment is not intended to limit the scope of the present invention, and all equivalent implementations or modifications without departing from the scope of the present invention should be included in the technical scope of the present invention.
Claims (7)
1. The flexible epoxy acrylate UV-cured coating is characterized by comprising the following raw materials: 100 parts of photosensitive resin, 1-5 parts of photoinitiator and 30-50 parts of reactive diluent, wherein the photosensitive resin comprises graft modified epoxy acrylate and polycondensation modified epoxy acrylate, and the weight ratio of the graft modified epoxy acrylate to the polycondensation modified epoxy acrylate is 0.3-0.5: 1; the modifier of the grafted modified epoxy acrylate is perfluoroalkanoyl chloride, and the polycondensation modified epoxy acrylate is obtained by polycondensation of dimerized fatty acid, epoxy resin and acrylic acid;
the grafting rate of the graft modified epoxy acrylate is 20-40%;
the molar ratio of the dimeric fatty acid to the epoxy resin to the acrylic acid in the polycondensation modified epoxy acrylate is 0.07-0.1:1: 1.7-1.9; the dimer fatty acid is obtained by mutual polymerization of oleic acid and linoleic acid, and the acid value is 190-200 mgKOH/g.
2. The coating according to claim 1, wherein the number of carbon atoms in said perfluoroalkanoyl chloride is 5 to 10, and is at least one selected from the group consisting of perfluorovaleryl fluoride, perfluorohexanoyl fluoride, perfluoroheptanoyl fluoride, perfluorooctanoyl chloride, perfluorononanoyl chloride and perfluorodecanoyl chloride.
3. The coating of claim 1, wherein the graft-modified epoxy acrylate is prepared by a process comprising the steps of:
s1, adding epoxy acrylate, triethylamine serving as a catalyst and a solvent into a reaction kettle, heating, dropwise adding perfluoroalkanoyl chloride under the condition of constant-temperature stirring, and keeping constant temperature for continuous reaction;
s2, cooling the reaction kettle to room temperature, filtering to remove triethylamine hydrochloride, washing residues with alkali liquor, and washing with water to be neutral;
and S3, distilling under reduced pressure to remove the solvent and residual perfluoroalkanoyl chloride to obtain the graft modified epoxy acrylate.
4. The coating of claim 3, wherein the perfluoroalkanoyl chloride is added in step S1 for a period of time ranging from 0.5 to 1 hour; the temperature rise is 70-90 ℃, and the reaction time is 12-24 h; the alkali liquor in the step S2 is 3-5wt% sodium hydroxide or potassium hydroxide aqueous solution.
5. The coating of claim 1, wherein the epoxy resin is a bisphenol a type epoxy resin having an epoxy value of 0.40 to 0.54; and/or the reactive diluent is a multifunctional reactive diluent and comprises at least one of trimethylolpropane triacrylate, pentaerythritol triacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, polyethylene glycol diacrylate, 1, 6-hexanediol acrylate, diethylene glycol diacrylate phthalate, propoxylated trimethylolpropane triacrylate and pentaerythritol tetraacrylate.
6. The coating of claim 1, wherein the polycondensation-modified epoxy acrylate is prepared by a process comprising the steps of:
under the inert atmosphere, adding epoxy resin and an organic solvent into a reaction kettle, heating, adding dimeric fatty acid and a catalyst, uniformly stirring, firstly keeping constant temperature reaction, when the acid value is less than 10mg/KOH/g, cooling, adding a polymerization inhibitor, dropwise adding acrylic acid, secondly keeping constant temperature reaction, when the acid value is less than 10mg/KOH/g, stopping reaction, and decompressing and distilling the solvent to obtain viscous polycondensation modified epoxy acrylate.
7. Use of a coating according to any of claims 1-6 in a cable joint, comprising the steps of: adding photosensitive resin, a photoinitiator and an active diluent which are coating components into a stirrer, uniformly stirring, coating the mixture on the surface of a clean and dry substrate, and curing under the irradiation of ultraviolet light to obtain a coating film.
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| CN202011437245.2A CN112538310B (en) | 2020-12-10 | 2020-12-10 | Flexible epoxy acrylate UV curing coating and application thereof in cable joint |
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| CN202011437245.2A CN112538310B (en) | 2020-12-10 | 2020-12-10 | Flexible epoxy acrylate UV curing coating and application thereof in cable joint |
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| CN114149751A (en) * | 2021-12-29 | 2022-03-08 | 泰州亚德胶粘制品有限公司 | High-temperature-resistant and anti-warping optical adhesive and preparation method thereof |
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