CN115403964A - Water-based LED light diffusion coating, preparation method thereof and LED lamp - Google Patents
Water-based LED light diffusion coating, preparation method thereof and LED lamp Download PDFInfo
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- CN115403964A CN115403964A CN202210966878.5A CN202210966878A CN115403964A CN 115403964 A CN115403964 A CN 115403964A CN 202210966878 A CN202210966878 A CN 202210966878A CN 115403964 A CN115403964 A CN 115403964A
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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
- C09D125/00—Coating compositions based on 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 an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/02—Homopolymers or copolymers of hydrocarbons
- C09D125/04—Homopolymers or copolymers of styrene
- C09D125/08—Copolymers of styrene
- C09D125/14—Copolymers of styrene with unsaturated esters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F212/00—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 an aromatic carbocyclic ring
- C08F212/02—Monomers containing only one unsaturated aliphatic radical
- C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
- C08F212/06—Hydrocarbons
- C08F212/08—Styrene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/006—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polymers provided for in C08G18/00
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- 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
- C09D151/00—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers
- C09D151/08—Coating compositions based on graft polymers in which the grafted component is obtained by reactions only involving carbon-to-carbon unsaturated bonds; Coating compositions based on derivatives of such polymers grafted on to macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
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- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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Abstract
The invention relates to the field of optical coatings, and particularly discloses a water-based LED light diffusion coating, a preparation method thereof and an LED lamp, wherein the coating comprises the following raw materials in parts by weight: 120-180 parts of acrylic emulsion, 300-350 parts of light diffusant and 10-200 parts of first auxiliary agent; the acrylic emulsion is prepared from the following raw materials in parts by weight: 200-400 parts of common monomer, 1-30 parts of special monomer, 3-10 parts of emulsifier, 1-5 parts of initiator, 1-20 parts of second auxiliary agent and 400-600 parts of water. The special monomer is one or more of heterocyclic methacrylate, phosphate ester monomer, polyurea monomer and vinyl trimethoxy silane. By adopting the invention, excellent light transmittance and atomization effect can be obtained simultaneously, and the paint has good film forming, leveling, adhesion, boiling resistance and yellowing resistance, is halogen-free, sulfur-free, fluorine-free, low in VOC, environment-friendly and safe.
Description
Technical Field
The invention relates to the technical field of optical coating materials, in particular to a water-based LED light diffusion coating and a preparation method thereof.
Background
LED lighting fixtures have been widely used in various industries, and LED fixture housing materials need to have characteristics of high light diffusibility, high light transmittance, and good light source shielding. The water-based LED light diffusion coating is a new environment-friendly material in recent years, and is mainly prepared by adding a light diffusion agent and other auxiliaries into a water-based resin matrix, and a point light source is converted into a surface light source through the light diffusion agent, so that light forms diffuse reflection to achieve a light-homogenizing effect, and the glare problem of an LED lamp is effectively solved. The most common water-based LED light diffusion coating on the market at present is to add inorganic light diffusion agents or nano particles into an acrylic resin system.
Light transmittance and haze are important indexes for measuring the transparency of the LED lamp, however, the haze and transmittance are a pair of mutually restricted factors, and the light transmittance and the atomization effect are difficult to be simultaneously improved. In addition, ethanol or other volatile organic compounds are mostly used as diluents in the existing water-based light diffusion coating, VOC can volatilize, the problem of environmental protection exists, and potential safety hazards are brought. Furthermore, the existing water-based LED photodiffusion coating has the disadvantages of poor construction performance, difficulty in simultaneously having good film forming, leveling, adhesion, boiling resistance and yellowing resistance, difficulty in preparing a high solid content formula and high slurry consumption. In the construction process, the water-based paint is coated in a single pipe by spraying, and the paint with low solid content is difficult to ensure the appearance, aging property and haze of the coating and has larger hidden quality danger.
Disclosure of Invention
The invention aims to solve the technical problem of providing the water-based LED light diffusion coating, which can simultaneously obtain excellent light transmittance and atomization effect, has good film forming, leveling, adhesion, boiling resistance and yellowing resistance, is halogen-free, sulfur-free, fluorine-free, low in VOC, environment-friendly and safe.
The invention also aims to solve the technical problem of providing the water-based LED photodiffusion coating and the preparation method thereof, wherein the preparation method is simple and has strong practicability.
In order to achieve the technical effects, the invention provides a water-based LED light diffusion coating which comprises the following raw materials in parts by weight:
the acrylic emulsion is prepared from the following raw materials in parts by weight:
as an improvement of the scheme, the special monomer is one or more of heterocyclic methacrylate, phosphate ester monomer, polyurea monomer and vinyl trimethoxy silane.
The common monomer is one or more of butyl acrylate, isooctyl acrylate, acrylic acid, methyl methacrylate and styrene.
As an improvement of the scheme, the common monomer comprises the following components in parts by weight:
as an improvement of the scheme, the special monomer comprises the following components in parts by weight:
in an improvement of the above, the glass transition temperature Tg =5 to 20 ℃.
As an improvement of the scheme, the emulsifier is selected from one or more of an anionic surfactant, a cationic surfactant and a reactive emulsifier;
the initiator is ammonium persulfate;
the light diffusant is one or more of organic silicon powder, organic silicon microspheres, silicon micro powder, fluorescent powder and light calcium carbonate.
As an improvement of the scheme, the first auxiliary agent is one or more of a dispersing agent, a thickening agent, a bactericide, a defoaming agent and a whitening agent;
the second auxiliary agent is one or more of bactericide and neutralizer;
the thickening agent is one or more of polyurethane thickening agent, alkali-swelling acrylic acid thickening agent and water-soluble thickening agent;
the defoaming agent is one or more of a mineral oil defoaming agent and an organic silicon defoaming agent.
Correspondingly, the invention provides a preparation method of the water-based LED light diffusion coating, which comprises the following steps:
preparing an acrylic emulsion;
firstly, taking part of the first auxiliary agent, 60-70% of water and light diffusant, and stirring at high speed for 1-2 hours to obtain a first mixture;
adding the acrylic emulsion and the rest of the first auxiliary agent into the first mixture, and stirring the rest of 30 to 40 percent of water for 10 to 20 minutes to obtain a finished product.
As an improvement of the above scheme, an acrylic emulsion is prepared comprising:
adding 40-60% of emulsifier and water into a reaction kettle, stirring and mixing, adding common monomers, and emulsifying at normal temperature to obtain an emulsion;
leaving 15-25% of the emulsion for later use, adding special monomers into the remaining 75-85% of the emulsion, uniformly stirring, and discharging for later use to obtain an emulsified mixture;
polymerizing 15-25% of emulsion, the rest of 40-60% of emulsifier, 40-60% of initiator and water as seeds, wherein the reaction temperature is 75-85 ℃, and the reaction time is 10-25 minutes to obtain a polymerization solution;
dropping the emulsified mixture into the polymerization solution at 75-85 deg.c for 100-150 min, and dropping the rest 40-60% of initiator in 20-40 min;
and (3) after the dripping is finished, keeping the temperature at 90-94 ℃ for 40-80 minutes, and cooling to obtain the acrylic emulsion.
As an improvement of the above scheme, an acrylic emulsion is prepared comprising:
(1) Adding 1/2 of emulsifier and water into a reaction kettle, starting a stirrer at a rotating speed of 65-75 r/m, stirring and mixing, adding common monomers, and emulsifying for 20-40 minutes at normal temperature to obtain an emulsion;
(2) Leaving 15-20% of the emulsion for later use, adding special monomers into the remaining 80-85% of the emulsion, uniformly stirring, and discharging for later use to obtain an emulsified mixture;
(3) Polymerizing 15-20% of emulsion, the rest 1/2 of emulsifier, 1/2 of initiator and water as seeds at 80-85 ℃ for 10-25 minutes to obtain a polymerization solution;
(4) After the reaction is finished and the product is qualified by inspection, the emulsified mixture is added into the polymerization solution in a dropwise manner at the temperature of 80-85 ℃, the rest 1/2 of the initiator is added after 20-40 minutes, and the dropping time is 100-150 minutes.
(5) And (3) after the dripping is finished, preserving the heat for 40-80 minutes at 90-94 ℃, cooling after the sampling inspection is qualified, cooling to below 60 ℃, uniformly stirring, filtering and discharging to obtain the acrylic emulsion.
Correspondingly, the invention also provides an LED lamp which comprises a lamp tube, wherein the inner wall of the lamp tube is coated with the water-based LED light diffusion coating.
The implementation of the invention has the following beneficial effects:
the water-based LED light diffusion coating is an acrylate emulsion modified by special monomers, wherein the special monomers comprise heterocyclic methacrylate, a phosphate ester monomer, a polyurea monomer and vinyl trimethoxy silane, and the coating prepared by a special process has a soft-core and hard-shell structure and has the following advantages:
1. the coating has good film forming, leveling, adhering, boiling and yellowing resistance;
2. high light transmission and good haze, shields a light source, does not influence the light transmission rate, and the light transmission rate is more than or equal to 92 percent;
3. the environment-friendly smell is small, no solvent is added, and the VOC is close to 0;
4. the solid content is high, a high solid content formula can be made without being influenced by dilution ratio, and the pulp consumption is reduced;
5. the emulsion has high molecular weight, good construction performance, stable viscosity of a continuous construction product, no bubbles, uniform appearance of the obtained coating, smoothness, flatness and high yield;
6. the product is stored for a long time, does not have hard deposition, has good safety performance, is halogen-free, sulfur-free and fluorine-free.
Drawings
FIG. 1 is a flow chart of a method for preparing a water-based LED light diffusion coating of the present invention.
FIG. 2 is a flow chart of a method for preparing an acrylic emulsion according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings.
The invention provides a water-based LED photodiffusion coating which comprises the following raw materials in parts by weight:
the acrylic emulsion is prepared from the following raw materials in parts by weight:
preferably, the water-based LED light diffusion coating comprises the following raw materials in parts by weight:
the acrylic emulsion is prepared from the following raw materials in parts by weight:
the water-based LED light diffusion coating takes a light diffusion agent as a main component, and the ratio of the addition amount of the light diffusion agent to the addition amount of the acrylic emulsion is (30-35): (12-18), the dosage is more than that of the acrylic emulsion, so that the acrylic emulsion can play a good role in covering, ensure haze, effectively shield a light source, and simultaneously not affect the light transmittance, wherein the light transmittance is more than or equal to 92%. The light diffusing agent is preferably one or more of organic silicon powder, organic silicon microspheres, silicon micropowder, fluorescent powder and light calcium carbonate. Preferably, the light diffusing agent is one or more of organic silicon powder, organic silicon microspheres and silicon micropowder.
Among them, the silicone powder is a high-performance powder combining excellent performances of silicone such as lubricity, impact resistance, light diffusibility, heat resistance, and the like; the organic silicon microsphere has a three-dimensional cross-linked reticular molecular structure, and shows excellent heat resistance and dispersion performance; the internal molecular chain structure, crystal shape and lattice change rule of the silicon micropowder enable the silicon micropowder to have the characteristics of high temperature resistance, small thermal expansion coefficient, high insulation, corrosion resistance, piezoelectric effect, resonance effect, unique optical characteristics and the like.
The water-based LED photodiffusion coating can also be added with pigment, wherein the pigment can be titanium dioxide and is used for improving the haze, but the water-based LED photodiffusion coating is not limited to the titanium dioxide.
The first auxiliary agent is one or more of a dispersing agent, a thickening agent, a bactericide, a defoaming agent and a whitening agent; wherein the thickener is preferably one or more of a polyurethane thickener, an alkali-swellable acrylic thickener and a water-soluble thickener; the defoaming agent is preferably one or more of a mineral oil defoaming agent and a silicone defoaming agent. In the preparation process, the dispersant, the thickener, the bactericide, water and the light diffusant are mixed and stirred at high speed for 1 to 2 hours, and then the acrylic emulsion, the defoamer and the brightener are added.
Specifically, for implementing the acrylic emulsion, common monomers of the acrylic emulsion are one or more of butyl acrylate, isooctyl acrylate, acrylic acid, methyl methacrylate and styrene.
Preferably, the common monomers comprise the following components in parts by weight:
more preferably, the common monomers comprise the following components in parts by weight:
the butyl acrylate has the advantages of good water resistance and good adhesive force, the isooctyl acrylate improves flexibility and adhesive force, the acrylic acid has dispersing and stabilizing effects, the methyl methacrylate has the advantage of good weather resistance, and the styrene has the advantages of good scratch resistance and good water resistance.
The glass transition temperature of the water-based LED light diffusion coating is Tg = 5-20 ℃, preferably 5-15 ℃, and more preferably 10 ℃.
The glass transition temperature of the invention is one of the key factors, and the glass transition temperature is set to be 5-20 ℃ by adjusting common monomers, so that the paint can be ensured to have good aging resistance, yellowing resistance, water resistance and scratch resistance, and the adhesive force of the coating is improved. If the glass transition temperature is higher than 20 ℃, the aging resistance is poor, and the glass is easy to become brittle and fall off; if the glass transition temperature is less than 5 ℃, the adhesion and scratch resistance are poor, and the water resistance is also poor.
Specifically, the special monomer is one or more of heterocyclic methacrylate, phosphate ester monomer, polyurea monomer and vinyl trimethoxy silane. Preferably, the special monomer is at least two of heterocyclic methacrylate, phosphate ester monomer, polyurea monomer and vinyl trimethoxy silane.
Further preferably, the special monomers comprise, by weight:
more preferably, the special monomer comprises the following components in parts by weight:
the heterocyclic methacrylate in the special monomer is preferably azacyclo methacrylate or aromatic heterocyclic methacrylate, and is further preferably azacyclo methacrylate, and the heterocyclic group is introduced into the acrylate structure, so that higher intermolecular hydrogen bond and intermolecular force can be provided, the interfacial tension is reduced, the surface of an adhesive substrate is effectively infiltrated, and the wet adhesion, the waterproof performance and the scrubbing resistance of the coating can be obviously improved.
The polyurea monomer in the special monomer introduces carbamido on the acrylate structure, can provide higher intermolecular hydrogen bond and intermolecular force, reduce interfacial tension, and effectively infiltrate the surface of an adhesive substrate, thereby obviously improving the wet adhesion, the waterproof performance and the scrubbing resistance of a coating.
Phosphate ester monomers in the special monomers can generate a phosphate bond with the surface of glass, so that the adhesive force is improved, and a phosphate film formed by the phosphate ester has the effects of passivation and barrier on the surface of a paint film, and has the effects of improving the adhesive force, resisting water and resisting corrosion.
When the vinyl trimethoxy silane is used as a comonomer, the vinyl trimethoxy silane can be copolymerized with a polymerization monomer (such as acrylic acid, methacrylic acid, vinyl acetate, styrene and the like) containing unsaturated double bonds under the action of a catalyst at high temperature so as to endow the copolymer with moisture curing, good adhesion, water resistance and the like.
Therefore, by adding the special monomer, higher intermolecular hydrogen bond and intermolecular force can be obviously provided, the interfacial tension is reduced, and the surface of the adhesive substrate is effectively infiltrated, so that the wet adhesion, the water resistance, the scrubbing resistance and the corrosion resistance of the coating can be obviously improved.
The emulsifier is selected from one or more of anionic surfactant, cationic surfactant and reactive emulsifier, and specifically, the emulsifier can be selected from one or more of sodium dodecyl diphenyl oxide disulfonate, sodium fatty alcohol polyoxyethylene ether sulfonate, ammonium nonylphenol polyoxyethylene ether sulfate, adike SR-10 and Japanese first pharmaceutical HS-10, but is not limited thereto.
Preferably, the emulsifier is a reactive emulsifier which is not adsorbed or embedded into the surface of the emulsion particles after polymerization but is connected with the emulsion particle polymer in a covalent bond mode, so that the mechanical stability of the coating is better, and after the coating is formed into a film, the water vapor permeation resistance and the water resistance of the film layer are improved. Specifically, the reactive emulsifier is Adeca SR-10 or HS-10 of Japanese first medicine.
The initiator can be ammonium persulfate, but is not limited to the above.
The second auxiliary agent is one or more of a bactericide and a neutralizer; the bactericide can be a carbazone bactericide or the like, but is not limited to the above; the neutralizing agent is an alkaline solution such as ammonia, dimethylethanolamine, but not limited thereto.
And other auxiliary agents can be selected from the existing auxiliary agents according to actual requirements.
Compared with the existing light diffusion coating, the water-based LED light diffusion coating has the following technical comparison results:
correspondingly, as shown in fig. 1, the invention provides a preparation method of a water-based LED light diffusion coating, comprising:
s1, preparing acrylic emulsion;
s2, firstly, taking part of the first auxiliary agent, 60-70% of water and light diffusant, and stirring at a high speed for 1-2 hours to obtain a first mixture;
in step S2, the first additives added first mainly include, but are not limited to, dispersants, thickeners, bactericides, and the like. The addition timing of the auxiliary agent can be adjusted by those skilled in the art according to the performance requirements of the product.
The high-speed stirring speed is preferably 360-1440 rpm, which can be realized by using the existing high-speed stirring dispersing machine.
And S3, adding the acrylic emulsion and the rest of the first auxiliary agent into the first mixture, and stirring the rest of 30-40% of water for 10-20 minutes to obtain a finished product.
In step S2, the first auxiliary agents added later mainly refer to defoaming agents, whitening agents and the like, but are not limited thereto. The addition timing of the auxiliary agent can be adjusted by those skilled in the art according to the performance requirements of the product.
One of the invention points out that the preparation of the acrylic emulsion, as shown in figure 2, comprises the following steps:
s101, adding 40-60% of emulsifier and water into a reaction kettle, stirring and mixing, adding common monomers, and emulsifying at a normal temperature state to obtain an emulsion;
s102, reserving 15-25% of emulsion for later use, adding special monomers into the remaining 75-85% of emulsion, uniformly stirring, and discharging for later use to obtain an emulsified mixture;
s103, polymerizing 15-25% of emulsion, the rest 40-60% of emulsifier, 40-60% of initiator and water as seeds, wherein the reaction temperature is 75-85 ℃, and the reaction time is 10-25 minutes to obtain a polymerization solution;
s104, proportionally dripping the emulsified mixture into a polymerization solution at the temperature of 75-85 ℃, starting to drip the rest 40-60% of initiator after 20-40 minutes, and dripping for 100-150 minutes;
s105, after the material dropping, preserving the heat for 40-80 minutes at 90-94 ℃, and cooling to obtain the acrylic emulsion.
Preferably, an acrylic emulsion is prepared comprising:
s101, putting 1/2 of emulsifier and water into a reaction kettle, starting a stirrer at a rotating speed of 65-75 rpm, stirring and mixing, adding common monomers, and emulsifying for 20-40 minutes at normal temperature to obtain an emulsion;
s102, leaving 15-20% of emulsion for later use, adding special monomers into the remaining 80-85% of emulsion, uniformly stirring, and discharging for later use to obtain an emulsified mixture;
s103, polymerizing 15-20% of emulsion, the rest 1/2 of emulsifier, 1/2 of initiator and water as seeds, wherein the reaction temperature is 80-85 ℃, and the reaction time is 10-25 minutes to obtain a polymerization solution;
s104, after the reaction is finished and the product is qualified through inspection, the emulsified mixture is added into the polymerization solution in a dropwise adding mode at the temperature of 80-85 ℃, the rest 1/2 of the initiator is added in a dropwise adding mode after 20-40 minutes, and the dropping time is 100-150 minutes.
S105, after the material dripping is finished, preserving heat for 40-80 minutes at 90-94 ℃, cooling after sampling inspection is qualified, cooling to below 60 ℃, uniformly stirring, filtering and discharging to obtain the acrylic emulsion.
More preferably, an acrylic emulsion is prepared comprising:
s101, putting 1/2 of emulsifier and water into a reaction kettle, starting a stirrer at a rotating speed of 65-75 rpm, stirring and mixing, adding common monomers, emulsifying for 20-40 minutes at normal temperature, and uniformly stirring to obtain an emulsion;
s102, leaving 15-20% of emulsion for later use, adding special monomers into the remaining 80-85% of emulsion, uniformly stirring, and discharging for later use to obtain an emulsified mixture;
s103, polymerizing 15-20% of emulsion, the rest 1/2 of emulsifier, 1/2 of initiator and water as seeds, wherein the reaction temperature is 80-85 ℃, and the reaction time is 10-25 minutes to obtain a polymerization solution;
s104, after the reaction is finished and the product is qualified through inspection, the emulsified mixture is added into the polymerization solution in a dropwise adding mode at the temperature of 80-85 ℃, the rest 1/2 of the initiator is added in a dropwise adding mode after 20-40 minutes, and the dropping time is 100-150 minutes.
And S105, preserving heat for 40-80 minutes at 90-94 ℃ after the material dripping is finished, cooling after the sampling inspection is qualified, cooling to below 60 ℃, adding a defoaming agent and a neutralizing agent, uniformly stirring, filtering and discharging to obtain the acrylic emulsion.
Correspondingly, the invention also provides an LED lamp which comprises a lamp tube, wherein the inner wall of the lamp tube is coated with the water-based LED light diffusion coating.
The invention is further illustrated by the following specific examples
Example 1
The formula (I) is as follows:
the acrylic emulsion is prepared from the following raw materials in parts by weight:
the common monomer comprises the following components in parts by weight:
the special monomer comprises the following components in parts by weight:
2kg of heterocyclic methacrylate
2kg of vinyl trimethoxy silane;
the first auxiliary agent comprises 30kg of thickening agent, 1kg of bactericide and 0.5kg of defoaming agent;
the second auxiliary agent is 1kg of bactericide and 3kg of neutralizer.
(II) the preparation method comprises the following steps:
(1) Preparing acrylic emulsion:
adding 50% of emulsifier and water into a reaction kettle, stirring and mixing, adding common monomers, and emulsifying for 30 minutes at normal temperature to obtain an emulsion;
the 15% emulsion is left for standby, the special monomer is added into the remaining 85% emulsion, stirred for 10 minutes and discharged for standby after being uniformly stirred, and an emulsified mixture is obtained;
polymerizing 15% of emulsion, the rest 50% of emulsifier, 50% of initiator and water as seeds at the reaction temperature of 75 ℃ for 10 minutes to obtain a polymerization solution;
dropping the emulsified mixture into the polymerization solution at 75 ℃, starting dropping the rest 50% of the initiator after 20 minutes, wherein the dropping time is 100 minutes;
after the dripping is finished, keeping the temperature at 90 ℃ for 40 minutes, adding a defoaming agent and a neutralizing agent, uniformly stirring, and cooling to obtain an acrylic emulsion;
(2) According to the proportion, firstly taking the thickening agent, the bactericide, 70 percent of water and the light diffusant, and stirring at high speed for 1-2 hours to obtain a first mixture;
(3) And adding the acrylic emulsion and the defoaming agent into the first mixture according to the proportion, and stirring the rest 30 percent of water for 10 to 20 minutes to obtain a finished product.
Example 2
(1) The formula is as follows:
the formula (I) is as follows:
the acrylic emulsion is prepared from the following raw materials in parts by weight:
wherein the common monomer comprises the following components in parts by weight:
the special monomer comprises the following components in parts by weight:
heterocyclic methacrylate 5kg
5kg of vinyltrimethoxysilane.
The first auxiliary agent comprises 10kg of dispersing agent, 1kg of defoaming agent and 0.5kg of whitening agent;
the second auxiliary agent is 1.5kg of bactericide and 2kg of neutralizer.
(II) the preparation method comprises the following steps:
(1) And preparing acrylic emulsion:
adding 50% of emulsifier and water into a reaction kettle, stirring and mixing, adding common monomers, emulsifying for 40 minutes at normal temperature, and adding light diffusant, thickener and bactericide to obtain an emulsion;
leaving 20% of the emulsion for later use, adding the special monomer into the remaining 80% of the emulsion, stirring for 15 minutes, and discharging for later use after uniform stirring to obtain an emulsified mixture;
polymerizing 20% of emulsion, the rest 50% of emulsifier, 50% of initiator and water as seeds, wherein the reaction temperature is 80 ℃, and the reaction time is 20 minutes to obtain a polymerization solution;
dropping the emulsified mixture into the polymerization solution at 80 ℃, starting dropping the rest 50% of the initiator after 30 minutes, and keeping the dropping time for 120 minutes;
after the dripping is finished, preserving the heat for 60 minutes at the temperature of 92 ℃, cooling, adding a defoaming agent and a neutralizing agent, and uniformly stirring to obtain an acrylic emulsion;
(2) Firstly, taking a dispersing agent, 60 percent of water and a light diffusant according to the proportion, and stirring at a high speed for 1-2 hours to obtain a first mixture;
(3) And adding the acrylic emulsion, the defoaming agent and the whitening agent into the first mixture according to the proportion, and stirring the mixture for 10 to 20 minutes to obtain a finished product, wherein the balance is 40 percent of water.
Example 3
The formula (I) is as follows:
the acrylic emulsion is prepared from the following raw materials in parts by weight:
wherein the common monomer comprises the following components in parts by weight:
the special monomer comprises the following components in parts by weight:
heterocyclic methacrylate 6kg
Phosphate ester monomer 1kg
6kg of vinyltrimethoxysilane.
The first auxiliary agent comprises 10kg of dispersing agent, 25kg of thickening agent, 1kg of bactericide, 1kg of defoaming agent and 1kg of whitening agent;
the second auxiliary agent is 2kg of bactericide and 3kg of neutralizer.
(II) the preparation method comprises the following steps:
(1) Preparing acrylic emulsion:
adding 40% of emulsifier and water into a reaction kettle, stirring and mixing, adding common monomers, emulsifying for 35 minutes at normal temperature, and adding light diffusant, thickener and bactericide to obtain an emulsion;
the 25% emulsion is left for standby, the special monomer is added into the remaining 75% emulsion, stirred for 15 minutes and discharged for standby after being uniformly stirred, and an emulsified mixture is obtained;
polymerizing 25% of emulsion, the rest 60% of emulsifier, 40% of initiator and water as seeds at the reaction temperature of 85 ℃ for 25 minutes to obtain a polymerization solution;
dropping the emulsified mixture into the polymerization solution at 85 ℃, beginning to drop the rest 60% of the initiator after 40 minutes, and setting the dropping time to be 150 minutes;
after the dripping is finished, the temperature is kept for 80 minutes at 94 ℃, the mixture is cooled, the defoaming agent and the neutralizing agent are added, and the mixture is uniformly stirred to obtain acrylic emulsion;
(2) Firstly, taking a dispersing agent, a thickening agent, a bactericide, 70% of water and a light diffusant according to the proportion, and stirring at a high speed for 1-2 hours to obtain a first mixture;
(3) And adding the acrylic emulsion, the defoaming agent and the whitening agent into the first mixture according to the proportion, and stirring the mixture for 10 to 20 minutes to obtain a finished product, wherein the balance is 30 percent of water.
Example 4
The formula (I) is as follows:
the acrylic emulsion is prepared from the following raw materials in parts by weight:
wherein the common monomer comprises the following components in parts by weight:
the special monomer comprises the following components in parts by weight:
10kg of heterocyclic methacrylate
Polyurea monomer 2kg
10kg of vinyltrimethoxysilane.
The first auxiliary agent comprises 8kg of dispersing agent, 24kg of thickening agent, 1kg of bactericide, 1kg of defoaming agent and 1kg of whitening agent;
the second auxiliary agent is selected from 4kg of bactericide and 3kg of neutralizer.
(II) the preparation method comprises the following steps:
(1) And preparing acrylic emulsion:
adding 60% of emulsifier and water into a reaction kettle, stirring and mixing, adding common monomers, emulsifying for 40 minutes at normal temperature, and adding light diffusant, thickener and bactericide to obtain an emulsion;
leaving the 20% emulsion for later use, adding the special monomer into the remaining 80% emulsion, stirring for 20 minutes, and discharging after uniform stirring for later use to obtain an emulsified mixture;
polymerizing 20% of emulsion, the rest 40% of emulsifier, 60% of initiator and water as seeds, wherein the reaction temperature is 78 ℃, and the reaction time is 20 minutes to obtain a polymerization solution;
dropping the emulsified mixture into the polymerization solution at 78 ℃, starting dropping the rest 40% of the initiator after 35 minutes, wherein the dropping time is 130 minutes;
after the dripping is finished, preserving the heat for 70 minutes at 93 ℃, cooling, adding a defoaming agent and a neutralizing agent, and uniformly stirring to obtain an acrylic emulsion;
(2) According to the proportion, firstly taking a dispersant, a thickening agent, a bactericide, 60 percent of water and a light diffusant, and stirring at a high speed for 1-2 hours to obtain a first mixture;
(3) Adding acrylic emulsion, defoaming agent and whitening agent into the first mixture according to the proportion, and stirring the mixture for 10 to 20 minutes to obtain a finished product, wherein the balance is 40 percent of water.
Technical tests are carried out on the water-based LED light diffusion coatings obtained in the examples 1-4, and the results are as follows:
in conclusion, the water-based LED light diffusion coating disclosed by the invention has the following advantages:
1. the coating has good film forming, leveling, adhesion, boiling resistance and yellowing resistance;
2. high light transmission and good haze, shields a light source, does not influence the light transmission rate, and the light transmission rate is more than or equal to 92 percent;
3. the environment-friendly smell is small, no solvent is added, and the VOC is close to 0;
4. the solid content is high, a high solid content formula can be made without being influenced by dilution ratio, and the pulp consumption is reduced;
5. the emulsion has high molecular weight, good construction performance, stable viscosity of a continuous construction product, no bubbles, uniform appearance of the obtained coating, smoothness, flatness and high yield;
6. the product is stored for a long time, does not have hard deposition, has good safety performance, and is halogen-free, sulfur-free and fluorine-free.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (10)
1. The water-based LED light diffusion coating is characterized by comprising the following raw materials in parts by weight:
the acrylic emulsion is prepared from the following raw materials in parts by weight:
the special monomer is one or more of heterocyclic methacrylate, phosphate ester monomer, polyurea monomer and vinyl trimethoxy silane.
2. The aqueous LED light diffusing coating according to claim 1, wherein the glass transition temperature Tg of said aqueous LED light diffusing coating is = 5-20 ℃;
the common monomer is one or more of butyl acrylate, isooctyl acrylate, acrylic acid, methyl methacrylate and styrene.
3. The aqueous LED light diffusing coating of claim 2 wherein the common monomers comprise, in parts by weight:
4. the water-based LED light diffusion coating of claim 1, wherein the special monomers comprise, in parts by weight:
5. the water-based LED light diffusion coating of claim 1, wherein the emulsifier is selected from one or more of anionic surfactant, cationic surfactant and reactive emulsifier;
the initiator is ammonium persulfate;
the light diffusant is one or more of organic silicon powder, organic silicon microspheres, silicon micropowder, fluorescent powder and light calcium carbonate.
6. The water-based LED photodiffusion coating as claimed in claim 1, wherein the first auxiliary agent is one or more of a dispersant, a thickener, a bactericide, an antifoaming agent and a whitening agent;
the second auxiliary agent is one or more of a bactericide and a neutralizer;
the thickening agent is one or more of a polyurethane thickening agent, an alkali swelling acrylic acid thickening agent and a water-soluble thickening agent;
the defoaming agent is one or more of a mineral oil defoaming agent and an organic silicon defoaming agent.
7. A method of preparing the aqueous LED light diffusing coating of any one of claims 1-6, comprising:
preparing acrylic emulsion;
firstly, taking part of the first auxiliary agent, 60-70% of water and light diffusant, and stirring at high speed for 1-2 hours to obtain a first mixture;
adding the acrylic emulsion and the rest of the first auxiliary agent and the rest of 30-40% of water into the first mixture, and stirring for 10-20 minutes to obtain a finished product.
8. The method of claim 7, wherein preparing an acrylic emulsion comprises:
putting 40-60% of emulsifier and water into a reaction kettle, stirring and mixing, adding common monomers, and emulsifying at normal temperature to obtain an emulsion;
leaving 15-25% of the emulsion for later use, adding special monomers into the remaining 75-85% of the emulsion, uniformly stirring, and discharging for later use to obtain an emulsified mixture;
polymerizing 15-25% of emulsion, the rest of 40-60% of emulsifier, 40-60% of initiator and water as seeds, wherein the reaction temperature is 75-85 ℃, and the reaction time is 10-25 minutes to obtain a polymerization solution;
dropping the emulsified mixture into the polymerization solution at 75-85 deg.c for 20-40 min and the rest 40-60% of initiator for 100-150 min;
and (3) after the dripping is finished, keeping the temperature at 90-94 ℃ for 40-80 minutes, and cooling to obtain the acrylic emulsion.
9. The method of preparing the aqueous LED light diffusing coating of claim 8, wherein preparing an acrylic emulsion comprises:
(1) Adding 1/2 of emulsifier and water into a reaction kettle, starting a stirrer at a rotating speed of 65-75 r/m, stirring and mixing, adding common monomers, and emulsifying for 20-40 minutes at normal temperature to obtain an emulsion;
(2) Leaving 15-20% of the emulsion for later use, adding special monomers into the remaining 80-85% of the emulsion, uniformly stirring, and discharging for later use to obtain an emulsified mixture;
(3) Polymerizing 15-20% of emulsion, the rest 1/2 of emulsifier, 1/2 of initiator and water as seeds at 80-85 ℃ for 10-25 minutes to obtain a polymerization solution;
(4) After the reaction is finished and the product is qualified by inspection, the emulsified mixture is added into the polymerization solution in a dropwise manner in a matching manner at the temperature of 80-85 ℃, the rest 1/2 of the initiator is added after 20-40 minutes, and the dropping time is 100-150 minutes;
(5) And (3) after the dripping is finished, preserving the heat for 40-80 minutes at 90-94 ℃, cooling after the sampling inspection is qualified, cooling to below 60 ℃, uniformly stirring, filtering and discharging to obtain the acrylic emulsion.
10. An LED lamp comprising a lamp tube, wherein the inner wall of the lamp tube is coated with the water-based LED light diffusion coating as claimed in any one of claims 1 to 6.
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| 宋小平等: "《石油化学助剂及石油产品制造技术》", 科学技术文献出版社 * |
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