CN114989715A - Low-VOC high-fullness environment-friendly PU (polyurethane) gloss top-coat paint - Google Patents

Low-VOC high-fullness environment-friendly PU (polyurethane) gloss top-coat paint Download PDF

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Publication number
CN114989715A
CN114989715A CN202210797759.1A CN202210797759A CN114989715A CN 114989715 A CN114989715 A CN 114989715A CN 202210797759 A CN202210797759 A CN 202210797759A CN 114989715 A CN114989715 A CN 114989715A
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CN
China
Prior art keywords
component
parts
leveling agent
hexamethylene diisocyanate
low
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Pending
Application number
CN202210797759.1A
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Chinese (zh)
Inventor
钟炳新
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HENGCHANG PAINT (HUIYANG) CO Ltd
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HENGCHANG PAINT (HUIYANG) CO Ltd
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Priority to CN202210797759.1A priority Critical patent/CN114989715A/en
Publication of CN114989715A publication Critical patent/CN114989715A/en
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D175/00Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04Polyurethanes
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/20Diluents or solvents
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/47Levelling agents
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/65Additives macromolecular

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Paints Or Removers (AREA)

Abstract

The invention belongs to the technical field of coatings, and particularly relates to a low-VOC high-fullness environment-friendly PU (polyurethane) gloss clear finish. The synthetic fatty acid resin with high solid content and low viscosity and the hexamethylene diisocyanate based polyisocyanate selected by the invention can reduce the use of organic solvents and reduce VOC. The high-solid-content low-viscosity synthetic fatty acid resin has high hydroxyl content, the hexamethylene diisocyanate group polyisocyanate has high isocyanate group content, the cross-linking density of the hexamethylene diisocyanate group polyisocyanate is high after the hexamethylene diisocyanate group polyisocyanate and the hexamethylene diisocyanate group polyisocyanate react, and the chemical resistance is improved. Three leveling agents are used in a matched manner, so that the flatness of the surface of the whole paint film is improved. The invention uses cyclohexanone and butyl ester as solvents, reduces the addition of triphenyl, and is more environment-friendly. The invention uses the acrylate flatting agent, the fluorine modified acrylate flatting agent and the polyether modified organic silicon flatting agent in a matching way, and can also solve the problem of the flatting property of high-viscosity spraying.

Description

Low-VOC high-fullness environment-friendly PU (polyurethane) gloss top-coat paint
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a low-VOC high-fullness environment-friendly PU (polyurethane) bright clear finish.
Background
The paint is a continuous solid film which is coated on the surface of an object to be protected or decorated and can form firm adhesion with the object to be coated, also called paint film or coating, and is a viscous liquid which is usually prepared by taking resin or oil or emulsion as a main material, selectively adding pigment, filler and corresponding auxiliary agents and using organic solvent or water. The coatings can be classified into different categories according to different classification methods, wherein the coatings can be classified into: solvent-based coatings, water-based coatings, powder-based coatings, high-solids coatings, metallic coatings, pearlescent coatings, and solventless coatings; the coating can be classified into a matt coating, a flat coating, a matte coating and a high gloss coating (also called a bright coating) according to the brightness of the appearance of the coating film.
Nowadays, the requirement for environmental protection is getting higher, and the requirement for environmental protection is becoming more and more trend to realize low VOC of oil paint. Meanwhile, for the full-bright furniture products, the Chinese people still love the products with high fullness.
The existing oil paint still has various problems during construction under low VOC and high solid content, such as construction viscosity problem, construction compatibility, balance of leveling property and defoaming property after construction, and the like. One of the obvious differences in GB18581-2020 over GB18581-2009 is also the reduction in the use of triphenyl.
Therefore, how to provide a coating which has good workability under the conditions of high fullness and low VOC and does not contain benzene solvents is a technical problem to be solved at present.
Disclosure of Invention
The invention aims to provide a low-VOC high-fullness environment-friendly PU (polyurethane) bright clear finish. Especially, the effects of high fullness and good construction performance are realized under the conditions of no benzene solvent and low VOC.
The technical scheme adopted by the invention for solving the problems is as follows:
the low-VOC high-fullness environment-friendly PU (polyurethane) bright clear finish is characterized by comprising a component A and a component B;
the component A comprises the following components in parts by weight: 75-90 parts of high-solid content synthetic fatty acid resin, 5-18 parts of cyclohexanone, 4-6 parts of butyl ester, 0.1-0.9 part of flatting agent and 0.5-1 part of defoaming agent;
the component B comprises the following components in parts by weight: 25-40 parts of butyl ester, 50-56 parts of toluene diisocyanate and 10-20 parts of hexamethylene diisocyanate based polyisocyanate.
Further, the solid content of the high-solid content synthetic fatty acid resin is 85-99%, and the viscosity is lower than 18000MPa s/25 ℃. Compared with the conventional resin, the high-solid-content synthetic fatty acid resin and the hexamethylene diisocyanate based polyisocyanate have high solid content but low viscosity, can reduce the addition of organic solvent during construction, reduce the discharge amount of VOC (volatile organic compounds), realize high-solid-content construction, and finally achieve the effect of high fullness, wherein the film thickness of a paint film can reach more than 40 mu m.
Preferably, the toluene diisocyanate is at least one of a toluene diisocyanate trimer and a toluene diisocyanate adduct. Toluene diisocyanate with a solids content of more than 50% is preferred.
Further, the mass ratio of the component A to the component B is 1 (0.9-1.1), and the component A and the component B are mixed according to the mass ratio during construction.
Further, the defoaming agent is a polysiloxane defoaming agent. The polysiloxane antifoaming agent has strong foam breaking capability, and can well solve the foaming problem during high-viscosity spraying. Thereby generating the paint film effect of no prickly heat and dark bubbles.
Further, the leveling agent is at least one of an acrylate leveling agent, a fluorine modified acrylate leveling agent and a polyether modified organic silicon leveling agent.
Preferably, the leveling agent is 0.1-0.5 part of acrylate leveling agent, 0.1-0.3 part of fluorine modified acrylate leveling agent and 0.05-0.1 part of polyether modified organic silicon leveling agent.
Further, the mass ratio of the component A to the component B is 1 (0.9-1.1). When in construction, the components are mixed and used according to a proportion, other organic solvents are not needed to be used as diluents, and the construction solid content can reach more than 58 percent.
The invention has the beneficial effects that:
the invention provides a low-VOC high-fullness environment-friendly PU (polyurethane) bright clear finish, which is characterized in that the selected high-solid-content low-viscosity synthetic fatty acid resin and hexamethylene diisocyanate based polyisocyanate can reduce the use of organic solvents and reduce the discharge amount of VOC, the high-solid-content low-viscosity synthetic fatty acid resin has high hydroxyl content, the hexamethylene diisocyanate based polyisocyanate has high isocyanate group content, the cross-linking density of the two is high after the two react, and the chemical resistance is improved. Three leveling agents are used in a matched manner, so that the flatness of the surface of the whole paint film is improved.
The invention also uses cyclohexanone and butyl ester as solvents, reduces the addition of triphenyl, and is more environment-friendly.
The invention also uses the acrylate flatting agent, the fluorine modified acrylate flatting agent and the polyether modified organic silicon flatting agent in a matching way, and can solve the problem of the flatting property of high-viscosity spraying. The polyether modified organic silicon leveling agent can lower the surface tension strongly, realize rapid short wave leveling, float to the surface and improve the hand feeling and scratch resistance; the acrylate leveling agent and the fluorine modified acrylate leveling agent are long-wave leveling agents, and the late-stage slow leveling effect of the coating can be realized. In the PU gloss clear finish paint provided by the invention, the dryness is slower than that of the conventional PU gloss clear finish paint, and enough time is provided for the acrylate flatting agent and the fluorine modified acrylate flatting agent to play a role, so that the flat paint film effect of the product is achieved.
The polysiloxane antifoaming agent used in the invention has strong foam breaking capability, and can well solve the foaming problem in high-viscosity spraying. Thereby generating the paint film effect of no prickly heat and dark bubbles.
Detailed Description
The present invention will be described in detail with reference to examples, which are only preferred embodiments of the present invention and are not intended to limit the present invention.
The invention is applied to 2 examples and 1 comparative formula table of the component A of the low-VOC high-fullness environment-friendly PU bright clear finish paint when being applied to construction on wood furniture, and the preparation method is conventional mixing and stirring in the field. (unit: parts by weight)
TABLE 1,
Component A Example a1 Example a2 Example a3 Example a4 Comparative example a1
90% solids synthetic fatty acid resin 75 80 / / /
85% solid content synthetic fatty acid resin / / 90 82 /
80% solids conventional synthetic fatty acid resin / / / / 76
Cyclohexanone 18 13 5 11.2 7.6
Butyl ester 6 5.7 4 5.5 5.5
Xylene / / / / 10
Acrylate leveling agent 0.5 0.1 0.3 0.3 0.3
Fluorine modified acrylate leveling agent 0.1 0.3 0.15 0.3 /
Polyether modified organic silicon flatting agent 0.1 0.1 0.05 0.05 0.1
Polymer defoaming agent / / / / 0.5
Polysiloxane antifoaming agent 0.5 0.5 0.5 0.5 /
Table 2 shows B component 1 example and a comparative example, prepared by mixing and stirring as is conventional in the art. (unit: parts by weight)
B component Example b1 Example b2 Comparative example b1
Xylene / / 5
Butyl ester 40 25 31
Hexamethylene diisocyanate based polyisocyanate 10 20 /
50% solids toluene diisocyanate trimer 12 16 8
75% solids toluene diisocyanate adduct 46 34 56
Testing various performances of the spray plate after oil adjustment, testing the construction VOC content according to the regulation in GB18581-2020 (GB/T23985-; the low VOC high-fullness environment-friendly PU bright and clear surface of the invention during construction has various performances of 5 examples and 1 comparative example, and the test results are shown in the following table:
test items Example 1 Example 2 Example 3 Example 4 Example 5 Comparative example 1
Construction ratio Example a 1: example b1= 1:1 Example a 2: example b1= 1:0.9 Example a 1: example b2= 1:1.1 Example a 3: example b1= 1:1 Example a 4: example b1= 1:0.9 Comparative example a 1: comparative example b 1: organic solvent Agent =1:1:0.6
Dilute seconds/rock field 2# Cup, 30 deg.C 22 second 75 23 seconds 22 23 seconds 01 22 seconds 45 21 second 45 10 seconds 60
Construction anchor 58% 60% 60% 60.3% 59.2% 41%
Construction VOC content (g/L) 415 396 394 386 398 596
Test substrate Benefit-keeping board Health care board Benefit-keeping board Benefit-keeping board Health care board Benefit-keeping board
Surface dryness/30 deg.C 50min 55min 60min 53min 53min 36min
Pressed dry/30 deg.C 5h30min 6h 6h20min 5h40min 5h40min 3h
Leveling property The surface is flat and the leveling property is good The surface is flat and the leveling property is good The surface is flat and the leveling property is good The surface is flat and the leveling property is good The surface is flat and the leveling property is good The surface is flat and the leveling property is good
Gloss of 97.5-98 98.5-99 97-98 98-99 98-99 100-101
Adhesion (lattice drawing method) Level 1 Level 1 Level 1 Level 1 Level 1 Level 1
Film thickness of paint film 50μm 54μm 54μm 52μm 51μm 30μm
Effect of panel Smooth, high transparency and no prickly heat Zi, Lu bubble Smooth, high transparency and no prickly heat Seed, dark bubble Smooth, high transparency and no prickly heat Zi, Lu bubble Smooth, high transparency and no prickly heat Zi, Lu bubble Smooth, high transparency and no prickly heat Zi, Lu bubble Smooth, high transparency, no prickly heat and darkness Bubble
Smell of paint film Substantially odorless Substantially odorless Substantially odorless Substantially odorless Substantially odorless Substantially odorless
Hardness at night B B B B B HB
Hardness after 4 days H H H H H H
The formulation of the comparative example needs to solve the problems of leveling and defoaming after being diluted by an organic solvent, and can be normally constructed for subsequent tests. As can be seen from the test results of the comparative examples, the PU gloss top-coat prepared according to the formula of the invention in examples 1-5 does not need benzene organic solvents, has high construction solid content and low VOC, and can keep high fullness.
The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are all within the protection scope of the present invention.
It should be noted that the various features described in the foregoing embodiments may be combined in any suitable manner without contradiction. The invention is not described in detail in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.

Claims (8)

1. The low-VOC high-fullness environment-friendly PU (polyurethane) bright clear finish is characterized by comprising a component A and a component B;
the component A comprises the following components in parts by weight: 75-90 parts of high-solid content synthetic fatty acid resin, 5-18 parts of cyclohexanone, 4-6 parts of butyl ester, 0.1-0.9 part of flatting agent and 0.5-1 part of defoaming agent;
the component B comprises the following components in parts by weight: 25-40 parts of butyl ester, 50-56 parts of toluene diisocyanate and 10-20 parts of hexamethylene diisocyanate based polyisocyanate.
2. The PU gloss clear finish according to claim 1, wherein the high solid content synthetic fatty acid resin solid content is 85% -99%, and the viscosity is lower than 18000 MPa-s/25 ℃.
3. The PU top-coat according to claim 1, wherein the toluene diisocyanate is at least one of a toluene diisocyanate trimer and a toluene diisocyanate adduct.
4. The PU gloss clear finish according to claim 1, wherein the mass ratio of the component A to the component B is 1 (0.9-1.1).
5. The PU gloss clear finish according to claim 3, wherein the component A and the component B are mixed in the mass ratio during construction.
6. The PU gloss varnish according to claim 1, wherein the defoamer is a polysiloxane defoamer.
7. The PU gloss clear finish according to claim 1, wherein the leveling agent is at least one of an acrylate leveling agent, a fluorine-modified acrylate leveling agent, and a polyether-modified silicone leveling agent.
8. The PU top-coat according to any one of claims 1 to 7, wherein the leveling agent is 0.1 to 0.5 part of acrylate leveling agent, 0.1 to 0.3 part of fluorine-modified acrylate leveling agent, and 0.05 to 0.1 part of polyether-modified silicone leveling agent.
CN202210797759.1A 2022-07-08 2022-07-08 Low-VOC high-fullness environment-friendly PU (polyurethane) gloss top-coat paint Pending CN114989715A (en)

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CN202210797759.1A CN114989715A (en) 2022-07-08 2022-07-08 Low-VOC high-fullness environment-friendly PU (polyurethane) gloss top-coat paint

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CN202210797759.1A CN114989715A (en) 2022-07-08 2022-07-08 Low-VOC high-fullness environment-friendly PU (polyurethane) gloss top-coat paint

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107418417A (en) * 2017-08-30 2017-12-01 展辰新材料集团股份有限公司 A kind of polyurethane Brilliant white paint
CN107502172A (en) * 2017-08-30 2017-12-22 展辰新材料集团股份有限公司 A kind of polyurethane glossy varnish
CN109627957A (en) * 2018-10-31 2019-04-16 澳达树熊涂料(惠州)有限公司 A kind of plentiful color inhibition showering glossy varnish coating of PU high and preparation method thereof
CN113897127A (en) * 2021-11-11 2022-01-07 亚士创能科技(上海)股份有限公司 Polyurethane bright white finish and preparation method and application thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107418417A (en) * 2017-08-30 2017-12-01 展辰新材料集团股份有限公司 A kind of polyurethane Brilliant white paint
CN107502172A (en) * 2017-08-30 2017-12-22 展辰新材料集团股份有限公司 A kind of polyurethane glossy varnish
CN109627957A (en) * 2018-10-31 2019-04-16 澳达树熊涂料(惠州)有限公司 A kind of plentiful color inhibition showering glossy varnish coating of PU high and preparation method thereof
CN113897127A (en) * 2021-11-11 2022-01-07 亚士创能科技(上海)股份有限公司 Polyurethane bright white finish and preparation method and application thereof

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Application publication date: 20220902