CN101381581B - Polyurethane transparent matt topcoat, preparation method and use method thereof - Google Patents
Polyurethane transparent matt topcoat, preparation method and use method thereof Download PDFInfo
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Abstract
The invention relates to transparent matt polyurethane varnish. The preparation method of the varnish comprises the following steps: according to weight percentage, 40 to 60 percent of alkyd, 10 to 40 percent of elastic resin and 0.3 to 1.0 percent of a dispersant are sequentially added and are dispersed at the speed of 500 revolutions per minute for 3 to 5 minutes to evenness; while stirring, 2.0 to 5.0 percent of flatting powder, 3.0 to 10 percent of glass powder and 0.5 to 2.0 percent of wax powder are added and are dispersed for 15 minutes at the speed of 1,000 revolutions per minute till the fineness is less than or equal to 25 mu m; 0.2 to 0.5 percent of a leveling agent, 0.2 to 0.5 percent of an antisettling agent and 13.6 percent of a mixed solvent are sequentially added and are dispersed for 10 minutes at the speed of 800 revolutions per minute; 1.0 to 5.0 percent against 20 percent scratch resistant resin which is pre-dispersed is added into a varnish material obtained by the steps under the low-speed stirring; and after adding, the varnish material is dispersed for 10 to 15 minutes at the speed of 500 revolutions per minute to evenness and is filtered to obtain the transparent matt anti-scratch polyurethane varnish. The crosslinking density NCO/OH of the varnish and a curing agent is between 1.0 and 1.1; and the curing agent is mixed by the following compositions in weight percentage: 25 percent of aliphatic poly-isocyanate, 45 percent of aromatic poly-isocyanate and 30 percent of anhydrous butyl acetate. The varnish has good scratch resistance and high hardness; and a varnish film has smooth hand feeling, good transparence, does not blanch basically, has good storage stability and can be recoated.
Description
Technical field
The present invention relates to high concentrations of toluene diisocyanate, particularly relate to transparent mute light polyurethane finish of a kind of anti scuffing and preparation method thereof and using method.
Background technology
High concentrations of toluene diisocyanate is of a great variety in the market, and particularly the PU transparent matt top coat top coat as anti-xanthochromia transparent matt top coat top coat, requires the transparent matt top coat top coat of good hand touch, requires fullness ratio, and the dull finishing coat that the transparency is good is all more.But all there is a kind of common fault in these transparent matt top coat top coats, be exactly coating surface very easily by scratch, give to use the furniture surface of these paint to cause damage.
Summary of the invention
The technical problem to be solved in the present invention provides transparent matt top coat top coat of a kind of energy anti scuffing and preparation method thereof and using method.
For solving the problems of the technologies described above, the invention provides a kind of polyurethane transparent matt top coat top coat, make by following weight proportion component:
The A component:
Synolac 40-60
Elastic resin 10-40
Gray Si ED-20 flatting silica 2.0-5.0
Dispersion agent 0.3-1.0
Wax powder 0.5-2.0
The imperial gloomy VX-S glass powder 3.0-10 of Japan
BYK333 flow agent 0.2-0.5
Anti-settling agent 0.2-0.5
20% anti scuffing resin 1.0-5.0
Solvent 13.6;
B component solidifying agent:
Aliphatic polymeric isocyanate 25
Aromatic poly-isocyanate 45
Glacial acetic acid butyl ester 30;
OH in the B component in the NCO/A component is 1.0～1.1;
Described Synolac is that hydroxyl value is 120 ± 10mgKOH/g, to contain admittedly be 60% or 70% soya fatty acid modified resin liquid; Described elastic resin is that medium-oil-length, hydroxyl value are 120 ± 10mgKOH/g, to contain admittedly be 70% resin liquid;
Described 20% anti scuffing resin is to be 20% vinyl chloride-vinyl acetate resin solution with the concentration expressed in percentage by weight that the dilution of the dimethylbenzene of equivalent and butanone forms.
Described solvent is mixed by N-BUTYL ACETATE, dimethylbenzene and propylene glycol acetic ester.
Described A component weight proportion is:
Synolac 50
Elastic resin 20
Dispersion agent 0.5
Flatting silica 2
Glass powder 8
Wax powder 0.5
Flow agent 0.2
Anti-settling agent 0.2
20% vinyl chloride-vinyl acetate resin VAGH 5;
Described solvent is mixed by the component of following weight proportion:
Propylene glycol acetic ester 5
Dimethylbenzene 3.6
N-BUTYL ACETATE 5.
Described dispersion agent is an anionic property polymer interfacial agent, and anti-settling agent is a kind of polyamides ammoniuria anti-settling agent.
A kind of method for preparing the described polyurethane transparent matt top coat top coat A of claim 1 component comprises the steps:
Get Synolac in the component according to weight proportion, elastic resin, dispersion agent adds successively, 500RPM disperses 3～5 minutes to even, add flatting silica while stirring then, glass powder, wax powder 1000RPM disperse 15 minutes to fineness≤25um, add flow agent more by weight successively, anti-settling agent, the mixed solvent of propylene glycol acetic ester, dimethylbenzene, N-BUTYL ACETATE, 800RPM disperse 10 minutes evenly;
Subsequently pre-dispersed 20% good anti scuffing resin is added under stirring at low speed in the paint vehicle that above-mentioned steps obtains, after adding, 500RPM disperses 10～15 minutes to evenly, filters the A component that promptly obtains urethane anti scuffing transparent matt top coat top coat.
The pre-dispersed method of described 20% anti scuffing resin is: the adding weight ratio is 1: 1 dimethylbenzene and a butanone in container, add vinyl chloride-vinyl acetate resin VAGH while stirring, 800RPM disperses to dissolve fully to vinyl chloride-vinyl acetate resin in 30 minutes, obtains concentration expressed in percentage by weight and be 20% vinyl chloride-vinyl acetate resin liquid.
The using method of the described polyurethane transparent matt top coat top coat of a kind of claim 1, it is characterized in that, by weight the A component: B component solidifying agent: thinner=mix at 100: 50: 60, leave standstill after 10 minutes and carry out spraying application, sprayed air-dry 24 hours, promptly got urethane anti scuffing transparent matt top coat top coat film; Described thinner is mixed by following components in portion by weight:
Dimethylbenzene 50
N-BUTYL ACETATE 30
Propylene glycol methyl ether acetate 20.
The used main film forming substance of finish paint of the present invention (main lacquer) is Synolac, elastic resin, and the snappiness of elastic resin is good, and certain restorability is arranged, and the anti scuffing resin can adopt the vinyl chloride-vinyl acetate resin class, and surface toughness is better; Glass powder provides good hardness and physical strength; Flow agent makes paint film that good levelling property be arranged, and reduces the coefficient of friction of coating surface, improves anti scuffing, wear resistance; Flatting silica is that organic wax is handled, and has the anti scuffing effect.Used main film forming substance is an aliphatic polymeric isocyanate in the solidifying agent, and aromatic poly-isocyanate, aliphatic polymeric isocyanate have splendid weathering resistance, remarkable chemical resistant properties, and the high degree of mechanical tenacity can provide fabulous hardness and toughness; Aromatic poly-isocyanate is a kind of trimer curing agent of TDI autohemagglutination, itself has the rate of drying and hardness and the certain extinction that are exceedingly fast, for paint film provides enough hardness.For obtaining good scratch resistance, solidifying agent and finish paint master lacquer are allocated according to the cross-linking density of NCO/OH=1.0～1.1, because-NCO is high slightly can make paint film under the condition of high humidity (because under the high humidity, airborne water can absorb some-NCO, can cause the paint film over-all properties to descend) maintenance inherent mechanical property.To sum up, the polyurethane transparent matt top coat top coat of anti scuffing of the present invention, being mainly used in the furniture surface of office big pallet, computer desk and ask for something anti scuffing, is in use to prevent paint film by scratch or alleviate by a kind of polyurethane paint of scratch at furniture lacquer, and its scrath resistance spy is good; The hardness height, the paint film feel is more smooth; Paint film can recoat, basic non-whitening; Excellent storage stability.
Embodiment
Each component of the present invention all adopts existing starting material, component that embodiment 1～3 selects and weight and partly model can be but not limit product type listed in the table as shown in Table 1:
Table one
Wherein, Synolac 3108-X-60-1 is the soya fatty acid resin, is 60% admittedly contain, and hydroxyl value is 110～130mgKOH/g resin liquid, and main characteristic is that scratch resistance is hindered, easily delustring, and the transparency is good.
Elastic resin 3401-XT-70 is the resin of castor oil modified medium-oil-length, and oil length is 40～50, admittedly contain 70%, acid number≤15, hydroxyl value is 110～130mgKOH/g resin liquid, mainly is that snappiness is good, has certain elasticity.
The anti scuffing resin is the VAGH of LG-DOW company, contains hydroxyl value, can with a kind of powdex of solidifying agent reaction, have splendid snappiness.
Glass powder is the special organosilicon powder of Japanese Long Sen company, and hardness can reach 7 Mohs' hardness, and enough hardness and physical strengths are provided.
Flatting silica is Gray Si ED-20, and organic wax is handled, and has good suspension, even also can not produce hard-caked sediment through long time stored, main effect is delustring, has certain anti scuffing effect, and the transparency better.
Dispersion agent 929 is cloudy from property polymer interfacial agent, keeps the stable of flatting silica and glass powder fineness and prevents flocculation;
Wax powder BYK996 is a kind of tetrafluoroethylene vinegar, and fusing point has certain scratch resistance on 114 ℃, and splendid surperficial smooth property is provided, the coefficient that reduces friction, thus play the anti scuffing effect.
Flow agent BYK333 is polyether-modified organo-siloxane, and consistency is good, and levelling is provided, and smooth property, and the coefficient of friction of minimizing coating surface are improved the anti-scratch wear resistance that injures.
Anti-settling agent BYK410 is a kind of polyamides ammoniuria, uses the back to be split into a kind of pseudo-plasticity in system, and its thixotropy, flowability can prevent precipitation and sagging.
Thinner, mixed solvent mix with N-BUTYL ACETATE, slow curing solvent (propylene glycol acetic ester), dimethylbenzene, do not contain hydroxyl its (OH); The Glacial acetic acid butyl ester, promptly not moisture or water ratio＜0.05% can use.
Embodiment 1
Prepare urethane anti scuffing transparent matt top coat top coat master lacquer of the present invention:
Step 1: prepare 20% anti scuffing resin liquid earlier.Press 1:1 and add dimethylbenzene in container, butanone adds anti scuffing resin VAGH while stirring, and 800RPM disperses 30 minutes to dissolving fully, and it is standby to obtain weight percentage and be 20% VAGH liquid;
Step 2: add Synolac successively according to weight proportion shown in table one embodiment 1, elastic resin, dispersion agent, and 500RPM disperses 3～5 minutes to even, add flatting silica while stirring, glass powder, wax powder, 1000RPM disperse 15 minutes to fineness≤25um, add flow agent then by weight successively, anti-settling agent, N-BUTYL ACETATE, propylene glycol acetic ester, dimethylbenzene, 800RPM disperse 10 minutes evenly.
Step 3: get the 20%VAGH resin liquid 5Kg that obtains in the above-mentioned steps one, under stirring at low speed, be added in the paint vehicle that step 2 obtains, after adding, 500RPM disperses 10～15 minutes to even, and 100 orders filter the polyurethane transparent matt top coat top coat that promptly obtains anti scuffing.
Prepare supporting solidifying agent:
1. aliphatic polymeric isocyanate TP-90SB (Japanese Asahi Chemical Industry) 25Kg
2. aromatic poly-isocyanate 1451IL (Bayer) 45Kg
3. Glacial acetic acid butyl ester 30Kg
According to above-mentioned weight proportion, above-mentioned three kinds of liquid are added in the container, 500RPM disperses 5 minutes to even, and 400 orders filter and package, and promptly get complete curing agent.
Prepare supporting thinner:
1. dimethylbenzene 50
2. N-BUTYL ACETATE 30
3. propylene glycol methyl ether acetate 20
By above-mentioned weight proportion, above-mentioned three kinds of solvents are added in the production container, stirring at low speed 5 minutes, 400 orders filter and promptly obtain diluent.
Using method: with urethane anti scuffing transparent matt top coat top coat and complete curing agent and thinner by weight main lacquer: solidifying agent: thinner=100:50:60 mixes, leave standstill after 10 minutes and carry out spraying application, sprayed air-dry 24 hours, promptly got urethane anti scuffing transparent matt top coat top coat film.
The traditional performance detected result is shown in 1 corresponding data of embodiment in the table two.In the table two, * multilist more shows that scratch resistance is good more.
Embodiment 2
With 2 listed each composition weight of embodiment in the table one, repeat embodiment 1 described method (only each composition weight changes), prepare urethane anti scuffing transparent matt top coat top coat master lacquer; Component, proportioning and the preparation method of solidifying agent and thinner prepare solidifying agent and thinner among the repetition embodiment 1; Host and solidifying agent and thinner mixed according to 100:50:60 leave standstill 10 minutes, construct according to embodiment 1 described method then and dry, promptly obtain urethane anti scuffing transparent matt top coat top coat film.
The traditional performance detected result is shown in 2 corresponding datas of embodiment in the table two.
Embodiment 3
With 3 listed each composition weight of embodiment in the table one, repeat embodiment 1 described method (only each composition weight changes), prepare urethane anti scuffing transparent matt top coat top coat host; Component, proportioning and the preparation method of solidifying agent and thinner prepare solidifying agent and thinner among the repetition embodiment 1; Host and solidifying agent and thinner are mixed according to 100:50:60, construct according to embodiment 1 described method then and dry, obtain urethane anti scuffing transparent matt top coat top coat film.
The traditional performance detected result is shown in 3 corresponding datas of embodiment in the table two.
Table two
| Sequence number | Test item | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| 1 | Viscosity (KU/25 ℃) | 63 | 81 | 90 |
| 2 | Gel time | 4 hours | 4 hours | 4 hours |
| 3 | Press dry the time (branch) | 95 | 90 | 100 |
| 4 | Gloss | 57％ | 43％ | 73％ |
| 5 | Hardness (Chinese pencil) | H | H | H |
| 6 | Sticking power (level) | One-level | One-level | One-level |
| 7 | Snappiness (mm) | 2 | 2 | 2 |
| 8 | Impact (Kg.cm) | 45 | 45 | 45 |
| 9 | Scratch resistance | *** | ***** | **** |
Claims (7)
1. polyurethane transparent matt top coat top coat, make by following weight proportion component:
The A component:
Synolac 40-60
Elastic resin 10-40
Gray Si ED-20 flatting silica 2.0-5.0
Dispersion agent 0.3-1.0
Wax powder 0.5-2.0
The imperial gloomy VX-S glass powder 3.0-10 of Japan
BYK333 flow agent 0.2-0.5
Anti-settling agent 0.2-0.5
20% anti scuffing resin 1.0-5.0
Solvent 13.6;
B component solidifying agent:
Aliphatic polymeric isocyanate 25
Aromatic poly-isocyanate 45
Glacial acetic acid butyl ester 30;
OH in the B component in the NCO/A component is 1.0～1.1;
Described Synolac is that hydroxyl value is 120 ± 10mgKOH/g, to contain admittedly be 60% or 70% soya fatty acid modified resin liquid; Described elastic resin is that medium-oil-length, hydroxyl value are 120 ± 10mgKOH/g, to contain admittedly be 70% resin liquid;
Described 20% anti scuffing resin is to be 20% vinyl chloride-vinyl acetate resin solution with the concentration expressed in percentage by weight that the dilution of the dimethylbenzene of equivalent and butanone forms.
2. polyurethane transparent matt top coat top coat according to claim 1 is characterized in that, described solvent is mixed by N-BUTYL ACETATE, dimethylbenzene and propylene glycol acetic ester.
3. polyurethane transparent matt top coat top coat according to claim 1 is characterized in that, described A component weight proportion is:
Synolac 50
Elastic resin 20
Dispersion agent 0.5
Gray Si ED-20 flatting silica 2
The imperial gloomy VX-S glass powder 8 of Japan
Wax powder 0.5
BYK333 flow agent 0.2
Anti-settling agent 0.2
20% vinyl chloride-vinyl acetate resin VAGH 5;
Described solvent is mixed by the component of following weight proportion:
Propylene glycol acetic ester 5
Dimethylbenzene 3.6
N-BUTYL ACETATE 5.
4. according to each described polyurethane transparent matt top coat top coat of claim 1～3, it is characterized in that described dispersion agent is an anionic property polymer interfacial agent, anti-settling agent is a kind of polyamides ammoniuria anti-settling agent.
5. method for preparing the described polyurethane transparent matt top coat top coat of claim 1, comprising the preparation of A component, step is as follows:
Get Synolac in the component according to weight proportion, elastic resin, dispersion agent adds successively, 500RPM disperses 3～5 minutes to even, add flatting silica while stirring then, glass powder, wax powder 1000RPM disperse 15 minutes to fineness≤25um, add flow agent more by weight successively, anti-settling agent, the mixed solvent of propylene glycol acetic ester, dimethylbenzene, N-BUTYL ACETATE, 800RPM disperse 10 minutes evenly;
Subsequently pre-dispersed 20% good anti scuffing resin is added under stirring at low speed in the paint vehicle that above-mentioned steps obtains, after adding, 500RPM disperses 10～15 minutes to evenly, filters the A component that promptly obtains urethane anti scuffing transparent matt top coat top coat.
6. the method for preparing polyurethane transparent matt top coat top coat according to claim 5, it is characterized in that, the pre-dispersed method of described 20% anti scuffing resin is: the adding weight ratio is 1: 1 dimethylbenzene and a butanone in container, add vinyl chloride-vinyl acetate resin VAGH while stirring, 800RPM disperses to dissolve fully to vinyl chloride-vinyl acetate resin in 30 minutes, obtains concentration expressed in percentage by weight and be 20% vinyl chloride-vinyl acetate resin liquid.
7. the using method of the described polyurethane transparent matt top coat top coat of claim 1, it is characterized in that, by weight the A component: B component solidifying agent: thinner=mix at 100: 50: 60, leave standstill after 10 minutes and carry out spraying application, sprayed air-dry 24 hours, promptly got urethane anti scuffing transparent matt top coat top coat film; Described thinner is mixed by following components in portion by weight:
Dimethylbenzene 50
N-BUTYL ACETATE 30
Propylene glycol methyl ether acetate 20.
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