CN113817397A - Polyurethane polishing-free musical instrument sealing primer and preparation method and construction method thereof - Google Patents
Polyurethane polishing-free musical instrument sealing primer and preparation method and construction method thereof Download PDFInfo
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- CN113817397A CN113817397A CN202111215520.0A CN202111215520A CN113817397A CN 113817397 A CN113817397 A CN 113817397A CN 202111215520 A CN202111215520 A CN 202111215520A CN 113817397 A CN113817397 A CN 113817397A
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- polyurethane
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- 238000007789 sealing Methods 0.000 title claims abstract description 49
- 239000004814 polyurethane Substances 0.000 title claims abstract description 40
- 229920002635 polyurethane Polymers 0.000 title claims abstract description 40
- 238000010276 construction Methods 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000002904 solvent Substances 0.000 claims abstract description 59
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 34
- 239000000020 Nitrocellulose Substances 0.000 claims abstract description 32
- 229920001220 nitrocellulos Polymers 0.000 claims abstract description 32
- 239000012948 isocyanate Substances 0.000 claims abstract description 28
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 28
- 229920005989 resin Polymers 0.000 claims abstract description 20
- 239000011347 resin Substances 0.000 claims abstract description 20
- 239000012752 auxiliary agent Substances 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 6
- 238000005507 spraying Methods 0.000 claims abstract description 6
- 239000000945 filler Substances 0.000 claims description 29
- 239000013638 trimer Substances 0.000 claims description 27
- 229920000180 alkyd Polymers 0.000 claims description 16
- 239000002994 raw material Substances 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 239000012024 dehydrating agents Substances 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 239000000843 powder Substances 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 239000004925 Acrylic resin Substances 0.000 claims description 3
- 229920000178 Acrylic resin Polymers 0.000 claims description 3
- 229920003180 amino resin Polymers 0.000 claims description 3
- 239000003085 diluting agent Substances 0.000 claims description 3
- 239000012895 dilution Substances 0.000 claims description 3
- 238000010790 dilution Methods 0.000 claims description 3
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 239000010445 mica Substances 0.000 claims description 3
- 229910052618 mica group Inorganic materials 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 229920001225 polyester resin Polymers 0.000 claims description 3
- 239000004645 polyester resin Substances 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 239000000853 adhesive Substances 0.000 abstract description 14
- 230000001070 adhesive effect Effects 0.000 abstract description 14
- 238000005498 polishing Methods 0.000 abstract description 11
- 238000000576 coating method Methods 0.000 abstract description 9
- 238000007590 electrostatic spraying Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000002002 slurry Substances 0.000 abstract description 5
- 230000002708 enhancing effect Effects 0.000 abstract description 4
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 33
- 239000002518 antifoaming agent Substances 0.000 description 13
- 239000002270 dispersing agent Substances 0.000 description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 7
- 239000010703 silicon Substances 0.000 description 7
- 239000000126 substance Substances 0.000 description 7
- 239000011248 coating agent Substances 0.000 description 6
- 239000003973 paint Substances 0.000 description 5
- DKPFZGUDAPQIHT-UHFFFAOYSA-N Butyl acetate Natural products CCCCOC(C)=O DKPFZGUDAPQIHT-UHFFFAOYSA-N 0.000 description 4
- 229920000742 Cotton Polymers 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- FUZZWVXGSFPDMH-UHFFFAOYSA-N hexanoic acid Chemical compound CCCCCC(O)=O FUZZWVXGSFPDMH-UHFFFAOYSA-N 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- IEJIGPNLZYLLBP-UHFFFAOYSA-N dimethyl carbonate Chemical compound COC(=O)OC IEJIGPNLZYLLBP-UHFFFAOYSA-N 0.000 description 2
- 239000004922 lacquer Substances 0.000 description 2
- 230000037452 priming Effects 0.000 description 2
- LLHKCFNBLRBOGN-UHFFFAOYSA-N propylene glycol methyl ether acetate Chemical compound COCC(C)OC(C)=O LLHKCFNBLRBOGN-UHFFFAOYSA-N 0.000 description 2
- 235000012239 silicon dioxide Nutrition 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
- C08G18/4081—Mixtures of compounds of group C08G18/64 with other macromolecular compounds
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/54—Polycondensates of aldehydes
- C08G18/544—Polycondensates of aldehydes with nitrogen compounds
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/58—Epoxy resins
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
- C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/64—Macromolecular compounds not provided for by groups C08G18/42 - C08G18/63
- C08G18/6484—Polysaccharides and derivatives thereof
-
- 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
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/67—Unsaturated compounds having active hydrogen
- C08G18/68—Unsaturated polyesters
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/06—Polyurethanes from polyesters
-
- 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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
-
- 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
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/002—Priming paints
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Paints Or Removers (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention relates to the technical field of colorful coatings, and discloses a polyurethane polishing-free musical instrument sealing primer and a preparation method and a construction method thereof, wherein a component A comprises base resin, 20-30% of nitrocellulose pulp, 10-20% of a first solvent and 0-5% of an auxiliary agent; and B component: comprises isocyanate curing agent and second solvent; the weight ratio of the component A to the component B is 1: (0.2-1). The method comprises the steps of adding a proper amount of nitrocellulose slurry in a proper amount of seconds into the component A, keeping the non-solvent resistance of part of the nitrolacquer after the component A is filmed, electrostatically spraying the polyurethane sealing primer on the basis of no polishing, dissolving part of the primer by a solvent, and then curing to form the film, so that the polyurethane sealing primer and the primer are effectively combined to achieve the purpose of enhancing the adhesive force, and the polishing-free high-efficiency adhesive force can be realized; when the sealing primer is used for electrostatic spraying construction of musical instrument products, particularly for manufacturing closed high-grade musical instruments and other wooden products, the polishing frequency can be effectively reduced, and the construction period can be shortened.
Description
Technical Field
The invention relates to the technical field of colorful coatings, in particular to a polyurethane polishing-free musical instrument sealing primer and a preparation method and a construction method thereof.
Background
Along with the development of society, the living standard of people is higher and higher, the pursuit of good life is obviously improved, and the coating film as the furniture industry is developing towards a high-grade route and has higher and higher requirements on the performance of the coating film. The polyurethane polishing-free musical instrument sealing primer is an important member in musical instrument coatings due to outstanding performance and very large using amount, and is widely applied to musical instrument coating due to excellent adhesive force, excellent decorative performance, comprehensive chemical resistance and convenient construction performance.
At present, electrostatic spraying construction in the musical instrument market is widely applied, but a common closed bottom is made in the construction process, the bottom needs to be taken off line for polishing, secondary primer is sprayed on the surface again, otherwise, the adhesive force risk can occur, and the decoration performance of the musical instrument is seriously influenced. Therefore, the performance requirements of the instrument sealing primer product need to be adjusted, the polishing-free sealing primer is developed, the coating is not required to be finished again, the adhesion is strong, and the environment-friendly coating is needed.
Disclosure of Invention
Based on the problems, the invention provides a polyurethane polishing-free musical instrument sealing primer and a preparation method and a construction method thereof.A proper amount of nitrocellulose slurry with proper seconds is added into a component A, so that the component A keeps the non-solvent resistance of partial nitro-lacquer after film formation, the polyurethane sealing primer is electrostatically sprayed on the non-polishing basis, and the partial primer is dissolved by a solvent and then is cured into a film, so that the polyurethane sealing primer and the primer are effectively combined to achieve the purpose of enhancing the adhesive force, and the polishing-free musical instrument sealing primer can also have high-efficiency adhesive force; when the sealing primer is used for electrostatic spraying construction of musical instrument products, particularly for manufacturing closed high-grade musical instruments and other wooden products, the polishing frequency can be effectively reduced, and the construction period can be shortened.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
the polyurethane polishing-free instrument sealing primer is characterized by comprising the following raw material components:
the component A comprises: comprises the following components in percentage by weight: 30-40% of base resin, 20-30% of nitrocellulose pulp, 10-20% of first solvent, 0-5% of auxiliary agent and the balance of filler;
and B component: comprises isocyanate curing agent and second solvent; the weight ratio of the isocyanate curing agent to the second solvent is (2-10): 1;
the weight ratio of the component A to the component B is 1: (0.2-1).
Further, the isocyanate-based curing agent contains a TDI adduct and/or a TDI trimer.
Further, the weight ratio of the TDI adduct to the TDI trimer is 1: (0.5-1.5).
Further, the NCO% of the TDI adduct is 10-20%; the NCO% of the TDI trimer was 5-10%.
Further, the base resin is at least one selected from acrylic resin, alkyd resin, epoxy resin, polyester resin and amino resin, and the nitrocellulose pulp is at least one selected from 30-second pulp, 1/2-second pulp and 1/4-second pulp.
Further, the filler has an average particle diameter of 1000 mesh to 1500 mesh.
Furthermore, the filler is selected from one of talcum powder, silicon micropowder, transparent powder, silicon dioxide, mica and diatomite.
Further, the component B also comprises a dehydrating agent; the dosage of the dehydrating agent is 1-10% of the weight of the solvent.
In order to realize the technical effects, the invention also provides a preparation method of the polyurethane polishing-free musical instrument sealing primer, which at least comprises the following steps: mixing base resin, nitrocellulose pulp, an auxiliary agent, a filler and a first solvent to obtain a component A; mixing the isocyanate curing agent and the second solvent to obtain the component B.
In order to realize the technical effects, the invention also provides a construction method of the polyurethane polishing-free musical instrument sealing primer, which comprises the following steps: and adding the component A and the component B into a container according to the proportion, uniformly stirring, adding a proper amount of diluent for dilution, adjusting the viscosity to the corresponding viscosity when the viscosity of the rock field No. 2 viscosity cup is tested for 11-15 seconds, and performing spraying construction.
Compared with the prior art, the invention has the beneficial effects that: the method comprises the steps of adding a proper amount of nitrocellulose slurry in a proper amount of seconds into the component A, keeping the non-solvent resistance of part of the nitrolacquer after the component A is filmed, electrostatically spraying the polyurethane sealing primer on the basis of no polishing, dissolving part of the primer by a solvent, and then curing to form the film, so that the polyurethane sealing primer and the primer are effectively combined to achieve the purpose of enhancing the adhesive force, and the polishing-free high-efficiency adhesive force can be realized; when the sealing primer is used for electrostatic spraying construction of musical instrument products, particularly for manufacturing closed high-grade musical instruments and other wooden products, the polishing frequency can be effectively reduced, and the construction period can be shortened.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not used as limitations of the present invention.
Example 1:
the polyurethane polishing-free instrument sealing primer is characterized by comprising the following raw material components:
the component A comprises: comprises the following components in percentage by weight: 30-40% of base resin, 20-30% of nitrocellulose pulp, 10-20% of first solvent, 0-5% of auxiliary agent and the balance of filler;
and B component: comprises isocyanate curing agent and second solvent; the weight ratio of the isocyanate curing agent to the second solvent is (2-10): 1;
the weight ratio of the component A to the component B is 1: (0.2-1).
The preparation method of the polyurethane sanding-free instrument sealing primer at least comprises the following steps: mixing base resin, nitrocellulose pulp, an auxiliary agent, a filler and a first solvent to obtain a component A; mixing the isocyanate curing agent and the second solvent to obtain the component B.
The construction method of the polyurethane sanding-free instrument sealing primer comprises the following steps: and adding the component A and the component B into a container according to the proportion, uniformly stirring, adding a proper amount of diluent for dilution, adjusting the viscosity to the corresponding viscosity when the viscosity of the rock field No. 2 viscosity cup is tested for 11-15 seconds, and performing spraying construction.
In the embodiment, a proper amount of nitrocellulose slurry with proper seconds is added into the component A, so that the component A retains the non-solvent resistance of part of the nitrocellulose lacquer after film formation, the polyurethane sealing primer is electrostatically sprayed on the basis of no polishing, and the polyurethane sealing primer and the primer are effectively combined through dissolving part of the primer by a solvent and then curing to form a film, so that the aim of enhancing the adhesive force is fulfilled, and the polishing-free high-efficiency adhesive force can be realized; when the sealing primer is used for electrostatic spraying construction of musical instrument products, particularly for manufacturing closed high-grade musical instruments and other wooden products, the polishing frequency can be effectively reduced, and the construction period can be shortened.
The isocyanate curing agent in the embodiment comprises TDI adduct and/or TDI trimer, and the weight ratio of the TDI adduct to the TDI trimer is 1: (0.5-1.5), the NCO% of TDI adduct is 10-20%; the NCO% of the TDI trimer was 5-10%. Through selecting specific types of suitable alkyd resin, special TDI addition products and TDI tripolymer as main materials to match, and using in fillers with specific particle sizes, a polyurethane sanding-free musical instrument sealing primer with excellent sanding-free performance is finally obtained through a large number of experiments.
For the component A, the base resin in the embodiment is selected from at least one of acrylic resin, alkyd resin, epoxy resin, polyester resin and amino resin, the alkyd resin is more effective, and the alkyd resin can be at least one of TP3735-70, TP129, TP3850, TP3870, TP3735-70, TP3180, TP1109, Changxing 3106-X-70, 3107-X-60 and 3304-X-70.
The nitrocellulose pulp of the embodiment is at least one selected from 30 second cotton pulp, 1/2 second cotton pulp and 1/4 second cotton pulp of northern Sichuan chemical industry; the nitrocellulose pulp is selected from 1/4 second cotton pulp, and the effect is better. The average grain size of the filler is 1000 meshes-1500 meshes, and the effect is better when the average grain size of the filler is 1250 meshes.
The filler is selected from one of talcum powder, silicon micropowder, transparent powder, silicon dioxide, mica and diatomite. The first solvent is at least one selected from butyl acetate, ethyl acetate, dimethyl carbonate and propylene glycol methyl ether acetate. The auxiliary agent is at least one of defoaming agent, dispersing agent, flatting agent, ultraviolet-resistant absorbent and antioxidant; the auxiliary agent in the embodiment is a combination of a defoaming agent and a dispersing agent, and the weight ratio of the defoaming agent to the dispersing agent is 1: (0.5-1.5).
For the B component, the NCO% of the TDI adduct was 13. + -. 0.5%; the NCO% of the TDI trimer was 7.5. + -. 0.5%.
In the invention, the TDI trimer is at least one selected from the group consisting of the TDI trimer with the trade marks of R178E, R168E, DX-50E, HDX-50EL, HDX-50EAD-204T-3, HDX-50E, D-268T, D-208T, D-260T, D-262T. The second solvent is at least one selected from butyl acetate, ethyl acetate, dimethyl carbonate and propylene glycol methyl ether acetate; preferably, the second solvent is ethyl acetate. The component B also comprises a dehydrating agent; the dosage of the dehydrating agent is 1-10% of the weight of the solvent.
Example 2:
a polyurethane sanding-free instrument sealing primer comprises a component A and a component B; the weight ratio of the component A to the component B is 1: 0.5; the component A comprises the following raw materials in percentage by weight: 50% of base resin, 38% of nitrocellulose pulp, 8% of first solvent, 2% of auxiliary agent and the balance of filler; the component B comprises the following raw materials: isocyanate curing agent and second solvent; the weight ratio of the isocyanate curing agent to the second solvent is 5: 1.
the base resin is alkyd resin, and the alkyd resin is selected from TP 3735-70.
The nitrocellulose pulp is 1/4 second nitrocellulose pulp of northern Sichuan chemical industry.
The filler is made of silicon micropowder, and the average particle size of the filler is 1500 meshes.
The first solvent is ethyl acetate.
The auxiliary agent is a combination of a defoaming agent and a dispersing agent, and the weight ratio of the defoaming agent to the dispersing agent is 1: 1.
the isocyanate curing agent is a combination of TDI adduct and TDI trimer. The weight ratio of the TDI adduct to the TDI trimer is 1: 1.
the TDI addition product is selected from a Mitsui curing agent L-75T.
The TDI trimer is selected from the TDI trimer with the trade name of D-262T.
The second solvent is ethyl acetate.
The amount of the dehydrating agent is 5% of the weight of the solvent.
Example 3
A polyurethane sanding-free instrument sealing primer comprises a component A and a component B; the weight ratio of the component A to the component B is 1: 0.4; the component A comprises the following raw materials in percentage by weight: 45% of base resin, 30% of nitrocellulose pulp, 8% of first solvent, 2% of auxiliary agent and the balance of filler; the component B comprises the following raw materials: isocyanate curing agent and second solvent; the weight ratio of the isocyanate curing agent to the second solvent is 4: 1.
the base resin is alkyd resin, and the alkyd resin is selected from TP 3735-70.
The nitrocellulose pulp is 1/4 second nitrocellulose pulp of northern Sichuan chemical industry.
The filler is made of silicon micropowder, and the average grain size of the filler is 1250 meshes.
The first solvent is butyl acetate.
The auxiliary agent is a combination of a defoaming agent and a dispersing agent, and the weight ratio of the defoaming agent to the dispersing agent is 1: 0.5.
the isocyanate curing agent is a combination of TDI adduct and TDI trimer. The weight ratio of the TDI adduct to the TDI trimer is 1: 0.5.
the TDI addition product is selected from a Mitsui curing agent L-75T.
The TDI trimer is selected from 168E.
The second solvent is ethyl acetate.
Example 4
A polyurethane sanding-free instrument sealing primer comprises a component A and a component B; the weight ratio of the component A to the component B is 1: 0.4; the component A comprises the following raw materials in percentage by weight: 30% of base resin, 20% of nitrocellulose pulp, 10% of first solvent, 1% of auxiliary agent and the balance of filler; the component B comprises the following raw materials: isocyanate curing agent and second solvent; the weight ratio of the isocyanate curing agent to the second solvent is 4: 1.
the base resin is alkyd resin, and the alkyd resin is selected from TP 3735-70.
The nitrocellulose pulp is 1/4 second nitrocellulose pulp of northern Sichuan chemical industry.
The filler is made of silicon micropowder, and the average particle size of the filler is 1000 meshes.
The first solvent is butyl acetate.
The auxiliary agent is a combination of a defoaming agent and a dispersing agent, and the weight ratio of the defoaming agent to the dispersing agent is 1: 0.4.
the isocyanate curing agent is a combination of TDI adduct and TDI trimer. The weight ratio of the TDI adduct to the TDI trimer is 1: 0.4.
the TDI addition product is selected from a Mitsui curing agent L-75T.
The TDI trimer is selected from the TDI trimer with the trade name of D-202T.
The second solvent is ethyl acetate.
Example 5
A polyurethane sanding-free instrument sealing primer comprises a component A and a component B; the weight ratio of the component A to the component B is 1: 0.5; the component A comprises the following raw materials in percentage by weight: 50% of base resin, 30% of nitrocellulose pulp, 10% of first solvent, 2% of auxiliary agent and the balance of filler; the component B comprises the following raw materials: isocyanate curing agent and second solvent; the weight ratio of the isocyanate curing agent to the second solvent is 5: 1.
the base resin is alkyd resin, and the alkyd resin is selected from TP 3735-70.
The nitrocellulose pulp is 1/4 second nitrocellulose pulp of northern Sichuan chemical industry.
The filler is made of silicon micropowder, and the average grain size of the filler is 1250 meshes.
The first solvent is ethyl acetate.
The auxiliary agent is a combination of a defoaming agent and a dispersing agent, and the weight ratio of the defoaming agent to the dispersing agent is 1: 1.
the isocyanate curing agent is TDI addition product.
The TDI addition product is selected from a Mitsui curing agent L-75T.
The second solvent is ethyl acetate.
The amount of the dehydrating agent is 5% of the weight of the solvent.
Example 6
A polyurethane sanding-free instrument sealing primer comprises a component A and a component B; the weight ratio of the component A to the component B is 1: 0.5; the component A comprises the following raw materials in percentage by weight: 50% of base resin, 20% of nitrocellulose pulp, 5% of first solvent, 2% of auxiliary agent and the balance of filler; the component B comprises the following raw materials: isocyanate curing agent and second solvent; the weight ratio of the isocyanate curing agent to the second solvent is 5: 1.
the base resin is alkyd resin, and the alkyd resin is selected from TP 3735-70.
The nitrocellulose pulp is 1/4 second nitrocellulose pulp of northern Sichuan chemical industry.
The filler is made of silicon micropowder, and the average grain size of the filler is 1250 meshes.
The first solvent is ethyl acetate.
The auxiliary agent is a combination of a defoaming agent and a dispersing agent, and the weight ratio of the defoaming agent to the dispersing agent is 1: 1.
the isocyanate curing agent is a combination of TDI adduct and TDI trimer. The weight ratio of the TDI adduct to the TDI trimer is 1: 1.
the TDI addition product is selected from a Mitsui curing agent L-75T.
The TDI trimer is selected from the TDI trimer with the trade name of D-262T.
The second solvent is ethyl acetate.
The amount of the dehydrating agent is 5% of the weight of the solvent.
Performance testing
The polyurethane sanding-free musical instrument sealing primer prepared in example 2 was subjected to the following performance tests, and the test results are shown in table 1.
Evaluation method of adhesion test: selecting a solid wood board with deep wood grain conduit, carrying out electrostatic spraying, polishing-free sealing, continuously spraying polyurethane sealing primer, wherein the coating weight is 150 g/square meter, marking the surface of the paint film by a hundred-grid knife in a transverse and vertical manner at a grid marking interval of 2mm after the film is dried, sticking the paint film by using transparent adhesive, and pulling hard, so that the paint film has excellent adhesive force when not falling.
Table 1 results of performance testing of examples
As can be seen from the data in the above table, after a proper amount of nitrocellulose slurry in a proper number of seconds is added to the component A, the adhesive force between the polyurethane sealing primer and the priming paint is strong, and the polyurethane sealing primer and the priming paint can have high-efficiency adhesive force even if polishing is not performed; therefore, when the sealing primer is used for electrostatic spraying construction of musical instrument products, particularly for manufacturing wooden products such as closed high-grade musical instruments and the like, the polishing frequency can be effectively reduced, and the construction period can be shortened.
The above is an embodiment of the present invention. The embodiments and specific parameters in the embodiments are only for the purpose of clearly illustrating the process of verifying the invention and are not intended to limit the scope of the invention, which is defined by the claims, and all the equivalent structural changes made by applying the content of the specification of the invention should be covered by the scope of the invention.
Claims (10)
1. The polyurethane polishing-free instrument sealing primer is characterized by comprising the following raw material components:
the component A comprises: comprises the following components in percentage by weight: 30-40% of base resin, 20-30% of nitrocellulose pulp, 10-20% of first solvent, 0-5% of auxiliary agent and the balance of filler;
and B component: comprises isocyanate curing agent and second solvent; the weight ratio of the isocyanate curing agent to the second solvent is (2-10): 1;
the weight ratio of the component A to the component B is 1: (0.2-1).
2. The polyurethane sanding-free musical instrument sealing primer of claim 1 wherein the isocyanate-based curing agent comprises a TDI adduct and/or a TDI trimer.
3. The polyurethane sanding-free musical instrument sealing primer of claim 2 wherein the weight ratio of the TDI adduct to the TDI trimer is from 1: (0.5-1.5).
4. The polyurethane sanding-free musical instrument sealing primer of claim 3 wherein the TDI adduct has an NCO% of 10-20%; the NCO% of the TDI trimer was 5-10%.
5. The polyurethane sanding-free musical instrument sealing primer according to claim 1, wherein the base resin is at least one selected from the group consisting of acrylic resin, alkyd resin, epoxy resin, polyester resin, and amino resin, and the nitrocellulose pulp is at least one selected from the group consisting of 30 sec pulp, 1/2 sec pulp, 1/4 sec pulp.
6. The polyurethane sanding-free musical instrument sealing primer according to claim 1, wherein the filler has an average particle size of 1000 mesh to 1500 mesh.
7. The polyurethane sanding-free instrument sealing primer according to claim 1 or 6, wherein the filler is made of one material selected from talcum powder, silica powder, transparent powder, silica, mica and diatomite.
8. The polyurethane sanding-free musical instrument sealing primer as defined in claim 1 wherein the B component further includes a dehydrating agent; the dosage of the dehydrating agent is 1-10% of the weight of the solvent.
9. A method of preparing the polyurethane sanding-free musical instrument sealing primer according to any one of claims 1 to 8, comprising at least the steps of: mixing base resin, nitrocellulose pulp, an auxiliary agent, a filler and a first solvent to obtain a component A; mixing the isocyanate curing agent and the second solvent to obtain the component B.
10. A method of applying the polyurethane sanding-free instrument sealing primer of any one of claims 1-8, comprising the steps of: and adding the component A and the component B into a container according to the proportion, uniformly stirring, adding a proper amount of diluent for dilution, adjusting the viscosity to the corresponding viscosity when the viscosity of the rock field No. 2 viscosity cup is tested for 11-15 seconds, and performing spraying construction.
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