CN107936647A - Scratch resistance waterborne polyurethane coating - Google Patents

Abstract

This case is related to a kind of scratch resistance waterborne polyurethane coating, including following parts by weight：20 40 parts of silicone acrylic emulsion；30 50 parts of epoxy polyurethane latex；17 10 20 parts of fluorine last of the ten Heavenly stems ester of methacrylic acid；10 30 parts of curing agent；6 12 parts of neopentyl glycol；6 10 parts of organosilicon；37 parts of cyclohexanone；20 30 parts of glass dust；35 parts of initiator.The film formed after paint solidification of the present invention in substrate surface has scratch resistance and good ductility, appearance lubrication, while according to the difference of coating applications, the hardness and toughness ratio of adjustable coating, use scope is extensive, and cost is low.

Description

Scratch resistance waterborne polyurethane coating

Technical field

The present invention relates to chemical technology field, more particularly to a kind of scratch resistance waterborne polyurethane coating.

Background technology

Modern coatings developing direction, which can be used, in short to be summarized：Exploitation meets the high-performance kind of environmental requirement.The height of coating Performance includes the performances such as high decoration, heavy antisepsis, super-durable, functionalization and good construction application.Just take common decorative paint For, the lacquer finish coating of the object surface such as automobile, furniture is easily subject to sandstone, washing or artificial scrape and damages in use Wound, causes loss of gloss, cut, influences film beauty.Therefore, scoring resistance becomes an important indicator for weighing film performance.For The scoring resistance of coating is improved, various countries scientific research personnel has started various researchs, it is proposed that many solutions.People consider Unorganic glass has preferable wearability and scoring resistance, considers to coat in substrate surface easy to wear and is sunk with vapor phase method or vacuum The inorganic coating of drop method production.These coating have high wearability and scoring resistance, but remove cost using this coating It is higher outer, also because of the thermal coefficient of expansion of base material and coating adhesiveness can be caused poor, especially inorganic material poor toughness, frangible Split, limit its application.Additionally by the higher resin of selection hardness to increase the hardness of film, but pass through unilateral increase The hardness of polymer coating film can cause film poor ductility due to excessive high hardness so that coating to improve the scratch resistance of film The scope of application narrows.

The content of the invention

For technical problem existing in the prior art, this case provides a kind of scratch resistance waterborne polyurethane coating.

To achieve the above object, this case is achieved through the following technical solutions：

A kind of scratch resistance waterborne polyurethane coating, wherein, the raw material of the coating includes following parts by weight：

Preferably, a kind of scratch resistance waterborne polyurethane coating, wherein, the epoxy polyurethane latex solid content For 50%-70%.

Preferably, a kind of scratch resistance waterborne polyurethane coating, wherein, the ring in the epoxy polyurethane latex The mass fraction of oxygen tree fat is 8~25%.

Preferably, a kind of scratch resistance waterborne polyurethane coating, wherein, the organosilicon is hydroxy-end capped pair Amino side chain modified silicon oil.

Preferably, a kind of scratch resistance waterborne polyurethane coating, wherein, the glass dust is by following mass parts Component forms：

20-80 μm of glass dust 50-80wt%；

0.01-1 μm of glass dust 20-50wt%；

Preferably, a kind of scratch resistance waterborne polyurethane coating, wherein, the group of the following mass parts of curing agent It is grouped into：

Preferably, a kind of scratch resistance waterborne polyurethane coating, wherein, the initiator is two isobutyl of azo Cyanogen.

Preferably, a kind of scratch resistance waterborne polyurethane coating, wherein, the number of the polypropylene glycol monobutyl ether is equal Molecular weight Mn is 1000g/mol~3000g/mol.

The beneficial effects of the invention are as follows：

(1) present invention is using acrylic ester grafted epoxy polyurethane latex as main body, compared with one-component water paint, The advantages of two kinds of resins can be integrated, obtain the effect learnt from other's strong points to offset one's weaknesses, and both the adhesive force with epoxy resin is excellent for its feature The advantages of different and excellent corrosion resistance, the also hardness with Polyurethane lacquer, richness, wearability and chemical-resistant by force with And with the compatibility of color stuffing it is good the characteristics of；Weatherability, water resistance and the resistance tocrocking of coating are improved by adding silicone acrylic emulsion Energy.

(2) by add 17 fluorine last of the ten Heavenly stems ester of methacrylic acid improve coating chemical stability, weatherability, hydrolytic resistance, Hydrophobic, oleophobic property；Obtained by performances such as hydroxy-end capped double amino side chain modified silicon oil adhesive force, hardness, curing rates To improvement；Guarantor's color, the Gloss Retention of coating are improved by adding neopentyl glycol, and neopentyl glycol can be used as hydrophily chain extension Agent, when it is attached in polyurethane molecular, can make with the functional groups that can be ionized in polyurethane segment, so that point Subchain has hydrophily, can preferably be scattered in water phase.

(3) film formed after paint solidification of the present invention in substrate surface has scratch resistance and good ductility, appearance Lubrication, while according to the difference of coating applications, the hardness and toughness ratio of adjustable coating, use scope is extensive, and cost is low.

Embodiment

With reference to embodiment, the present invention is described in further detail, to make those skilled in the art with reference to specification Word can be implemented according to this.

A kind of scratch resistance waterborne polyurethane coating, wherein, the raw material of the coating includes following parts by weight：

Acrylic ester grafted epoxy polyurethane latex, compared with one-component water paint, can collect the excellent of two kinds of resins Point is integrated, and obtains the effect learnt from other's strong points to offset one's weaknesses, its feature had both had the adhesive force of epoxy resin excellent and excellent corrosion resistance The advantages of, also the hardness with Polyurethane lacquer, richness, wearability and chemical-resistant be strong and the compatibility with color stuffing The characteristics of good, when the mass fraction of the epoxy resin in epoxy polyurethane latex is 8~25%, hence it is evident that improve the water-fast of its film Property, it simultaneously because there is more hydrogen bonds to be formed, increased the tensile strength of film, but elongation at break also decreases；Silicon Acrylic emulsion is that the organic silicon monomer containing unsaturated bond and acrylic monomer are added suitable auxiliary agent, is coated by nucleocapsid poly- The lotion that process polymerisation forms is closed, combines organosilicon fire-resistant, weatherability, chemical-resistant and wearability, hydrophobic, surface High colour retention, pliability, the adhesion of the low not v ulnerability of energy and acrylic resin, coating is improved by adding silicone acrylic emulsion Weatherability, water resistance and antifouling property；17 fluorine last of the ten Heavenly stems ester of methacrylic acid, containing multiple fluorine atom, has very strong hydrophobic Property, thus reduce hydrolyzed due to monomer caused by film dusting, cracking, glossiness phenomena such as declining, stain resistance is also significantly Improve, 17 fluorine last of the ten Heavenly stems ester of methacrylic acid, which is easy to epoxy polyurethane emulsion copolymerization, can improve the chemical stability of coating, weather-proof Property, hydrolytic resistance, hydrophobic, oleophobic property.This coating can form the coating of good adhesion and intensity during air drying； It is used as initiator by adding azo-bis-isobutyl cyanide, triggers epoxy polyurethane latex and the crosslinking of 17 fluorine last of the ten Heavenly stems ester of methacrylic acid solid Change and other high molecular crosslinks react；Hydroxy-end capped double amino side chain modified silicon oils may participate in polymer reaction so that part Segment is reacted with polymer segment, is intertwined with polymer coating film strand, while polymer surfaces performance is improved It will not occur largely to migrate so that the performance such as adhesive force, hardness, curing rate is improved；Neopentyl glycol is five carbon Dihydric alcohol, does not have oxidable double bond in molecule, because without yellowing, the guarantor of coating is improved by adding neopentyl glycol Color, Gloss Retention, and neopentyl glycol can be used as hydrophilic chain extender, when it is attached in polyurethane molecular, can make polyurethane With the functional groups that can be ionized on segment, so that strand has hydrophily, can preferably be scattered in water phase.

Wherein, the epoxy polyurethane latex solid content is 50%-70%, particle diameter 80-120nm.

Wherein, the mass fraction of the epoxy resin in the epoxy polyurethane latex is 8~25%.

Wherein, the organosilicon is hydroxy-end capped double amino side chain modified silicon oils.

Wherein, the glass dust is made of the component of following mass parts：

20-80 μm of glass dust 50-80wt%；

0.01-1 μm of glass dust 20-50wt%；

Added by the glass dust of two kinds of specifications in coating, glass powder particles is arranged in coating closely, make internal group Knit uniformly, properties of product are stablized, and comprehensive strength is high, can effectively improve its scrape abrasion resistance.

Wherein, the component composition of the following mass parts of the curing agent：

Wherein, the initiator is azo-bis-isobutyl cyanide.

Wherein, the number-average molecular weight Mn of the polypropylene glycol monobutyl ether is 1000g/mol~3000g/mol.

Following table lists some specific embodiments：

Testing index

1st, adhesive force is tested：

The method of inspection：GB/T9286-1998；

Quality index：Six grades are divided into, 0,1,2 grade is qualification, and 3,4,5 grades are unqualified.

2nd, impact resistance performance test：

The method of inspection：GB/T1732-1993；

Quality index：Do not cause the mono- Wei ㎝ of height (of paint film destruction with the vertical drop of 1000g ± 1g weights) for index,

Multilayer thickness requires >=30 ㎏ ㎝ as qualification.

3rd, hardness test：

The method of inspection：GB/T6739-96；

Quality index：The order of hardness from high in the end is：9H ＞ 8H ＞ 6H ＞ 5H ＞ 4H ＞ 3H ＞ 2H ＞ H ＞ F ＞ HB ＞ B ＞ 2B ＞ 3B ＞ 4B ＞ 5B ＞ 6B.

4th, ductility is tested：

The method of inspection：Range estimation；

Quality index：Paint film does not crack as qualification.

5th, paint film appearance：

The method of inspection：Range estimation；

Quality index：Paint film flat smooth is qualification.

Following table is the test result of embodiment and comparative example：

Although embodiment of the present invention is disclosed as above, it is not restricted in specification and embodiment listed With it can be applied to various suitable the field of the invention completely, can be easily for those skilled in the art Realize other modification, therefore under the universal limited without departing substantially from claim and equivalency range, it is of the invention and unlimited In specific details.

Claims (8)

1. a kind of scratch resistance waterborne polyurethane coating, it is characterised in that the raw material of the coating includes following parts by weight：

A kind of 2. scratch resistance waterborne polyurethane coating as claimed in claim 1, it is characterised in that the epoxy polyurethane latex Solid content is 50%-70%.

A kind of 3. scratch resistance waterborne polyurethane coating as claimed in claim 1, it is characterised in that the epoxy polyurethane latex In epoxy resin mass fraction be 8~25%.

4. a kind of scratch resistance waterborne polyurethane coating as claimed in claim 1, it is characterised in that the organosilicon seals for hydroxyl Double amino side chain modified silicon oils at end.

5. a kind of scratch resistance waterborne polyurethane coating as claimed in claim 1, it is characterised in that the glass dust is by following matter Measure the component composition of part：

20-80 μm of glass dust 50-80wt%；

0.01-1 μm of glass dust 20-50wt%.

6. a kind of scratch resistance waterborne polyurethane coating as claimed in claim 1, it is characterised in that the curing agent is by following matter Measure the component composition of part：

7. a kind of scratch resistance waterborne polyurethane coating as claimed in claim 1, it is characterised in that the initiator is azo two Isobutyl cyanogen.

A kind of 8. scratch resistance waterborne polyurethane coating as claimed in claim 6, it is characterised in that the polypropylene glycol monobutyl ether Number-average molecular weight Mn be 1000g/mol~3000g/mol.