摘要:
The invention relates to coatings with a contact angle hysteresis in water as measured by the tilting plate method of at most 20° made from silyl-terminated linear prepolymers which may cross-link with the surface of the substrate for coating, wherein the silyl-terminated linear prepolymers may be obtained by reaction of compounds of general formula (I): X-A-X′ (I), where A=a polyoxyalkylene chain of ethylene oxide units or ethylene oxide and propylene oxide units with a maximum fraction of 50 wt. % of propylene oxide units based on the weight of A, X═OH, NH2, NHR, NR2 or OR, wherein R independently=a linear or branched 1-10 C alkyl, a 6-10 C alkaryl or aralkyl or a 5-10 C aryl and the compound of general formula (I) has a number average molecular weight of at least 100 g/mol, with compounds of general formula (II) Y—B—Si(OR1)r(R2)3−r, where Y=a group reactive with OH, NH2, NHR and/or NR2, B=a chemical bond or a divalent low-molecular weight organic group with preferably 1-50 carbon atoms, OR1=a hydrolysable group, R2=a linear or branched 1-6C alkyl and r=a number from 1 to 3 and optionally unreacted hydrogen atoms on the group X and/or the group X′ are optionally alkylated. The invention further relates to the production of such coatings and the use of the silyl-terminated linear pre-polymers from production of such coatings and application in mixtures with stellate silylated prepolymers.
摘要:
The invention relates to coatings having a contact angle hysteresis with water measured by the sessile drop method of at most 20°. The coatings can be produced from a mixture of at least two different stellate prepolymers and/or stellate prepolymer/nanoparticle complexes which may cross-link to each other and to the surface of the substrate coated, wherein the stellate prepolymers and/or stellate prepolymer/nanoparticle complex have at least three hydrophilic polymer branches before cross-linking which are themselves soluble in water with on all or a part of the free ends thereof, silyl end groups R1 of general formula (I): R1=—CRa2—Si(ORb)r(Rc)3-r, where Ra=H or straight or branched chain 1-6C alkyl, ORb=a hydrolysable group, Rc=linear or branched chain 1-6C alkyl and r=a number from 1 to 3 and the optionally non silyl end group carrying ends have reactive end groups which a reactive with each other, with the substrate to be coated optional entities included in the coating and/or with the silyl end groups with the proviso the mixture (a) has at least one stellate prepolymer with 3-5 hydrophilic polymer branches and (b) at least one stellate prepolymer and/or a stellate prepolymer/nanoparticle complex with a least 6 hydrophilic polymer branches. The invention further relates to a method for production for said coatings and stellate prepolymers as used in the coatings. The invention furthermore relates to the use of the stellate prepolymers as additives in various materials for temporary or permanent anti-soiling treatment of surfaces.