阅读说明：本技术 一种环保低温型拒水拒油组合物 (Environment-friendly low-temperature water-repellent and oil-repellent composition ) 是由 李义涛 侯琴卿 吴小云 别文丰 石玲 于 2018-07-26 设计创作，主要内容包括：本发明公开了一种环保低温型拒水拒油组合物及其制备方法和应用。所述拒水拒油组合物包含：共聚物A、表面活性剂B和介质C；所述共聚物A的共聚单体包括：单体a、单体b、单体c、以及可选的单体d和单体e；其中：单体c是含双键的封闭型异氰酸酯,结构如式(I)所示,R’、R<Sub>6</Sub>～R<Sub>10</Sub>各自独立地为羟基、氢原子、甲基、氟、氯或溴；单体d是具有环烃基的丙烯酸酯。所述拒水拒油组合物对环境友好,对人体无害,且具有低温烘烤性能,具有优异低温防水性。<Image he="503" wi="607" file="DDA0001744180290000011.GIF" imgContent="drawing" imgFormat="GIF" orientation="portrait" inline="no"></Image>(The invention discloses an environment-friendly low-temperature water-repellent and oil-repellent composition, and a preparation method and application thereof. The water-and oil-repellent composition comprises: copolymer A, surfactant B and medium C; the comonomers of the copolymer A comprise: monomer a, monomer b, monomer c, and optionally monomer d and monomer e; wherein: the monomer c is a double-bond-containing closed isocyanate with the structure shown as the formula (I), R' and R 6 ～R 10 Each independently is hydroxyl, hydrogen, methyl, fluorine, chlorine or bromine;the monomer d is an acrylate having a cyclic hydrocarbon group. The water-repellent and oil-repellent composition is environment-friendly, harmless to human bodies, and has low-temperature baking performance and excellent low-temperature water resistance.)

1. A water-and oil-repellent composition characterized by comprising: copolymer A, surfactant B and medium C; the comonomers of the copolymer A comprise: monomer a, monomer b, monomer c, and optionally monomer d and monomer e;

wherein: the monomer a is (meth) acrylate having a perfluoroalkyl group having 1 to 6 carbon atoms;

the monomer b is a (meth) acrylate having no perfluoroalkyl group but having an alkyl group of 16 to 28 carbon atoms;

the monomer c is a double-bond-containing closed isocyanate, and the structure of the monomer c is shown as the formula (I):

in the formula (I), R₁is-COOCH₂CH₂-；R₂Is methyl or a hydrogen atom; r', R₆～R₁₀Each independently is hydroxyl, hydrogen, methyl, fluorine, chlorine or bromine;

the monomer d is acrylate containing an aliphatic ring or/and an aromatic ring structure;

the monomer e is another functional monomer.

2. The water-and oil-repellent composition according to claim 1, wherein the medium C comprises water and a co-solvent, the co-solvent constituting 10 to 50% by mass of the entire composition; the copolymer A accounts for 10-40% of the mass of the whole composition; the surfactant B accounts for 1-10% of the total composition.

3. The water-and oil-repellent composition according to claim 1, wherein the monomer c is selected from one or a combination of two of 4-chloro-4 ' -hydroxybenzophenone-blocked isocyanoethyl (meth) acrylate, 2, 3-dihydroxybenzophenone-blocked isocyanoethyl (meth) acrylate, 2-fluoro-4 ' -hydroxybenzophenone-blocked isocyanoethyl (meth) acrylate, 5-bromo-2-hydroxybenzophenone-blocked isocyanoethyl (meth) acrylate, 4-hydroxybenzophenone-blocked isocyanoethyl (meth) acrylate, and 3-bromo-2 ', 5-dichloro-2-hydroxybenzophenone-blocked isocyanoethyl (meth) acrylate.

4. The water-and oil-repellent composition according to claim 3, wherein the monomer c is one or a combination of two selected from the group consisting of 4-chloro-4 '-hydroxybenzophenone-blocked isocyanoethyl (meth) acrylate, 2-fluoro-4' -hydroxybenzophenone-blocked isocyanoethyl (meth) acrylate, 5-bromo-2-hydroxybenzophenone-blocked isocyanoethyl (meth) acrylate, and 4-hydroxy-benzophenone-blocked isocyanoethyl (meth) acrylate.

5. The water and oil repellent composition according to claim 3, wherein said monomer c is obtained by reacting an acryloyl isocyanate having a structure represented by the formula (II):

in the formula (II), R₁is-COOCH₂CH₂-；R₂Is methyl or a hydrogen atom;

the structure of the hydroxybenzophenone is shown as the formula (III):

in the formula (III), R₃～R₁₀Each independently is hydroxyl, hydrogen, methyl, fluorine, chlorine or bromine, and R₃～R₅Wherein at least one substituent is a hydroxyl group.

6. The water-and oil-repellent composition according to claim 1, characterized in that the monomer d is one or a combination of at least two selected from cyclohexyl methacrylate, t-butylcyclohexyl methacrylate, benzyl methacrylate, isobornyl acrylate, dicyclopentanyl methacrylate, dicyclopentanyl acrylate, dicyclopentenyl methacrylate, dicyclopentenyl acrylate, styrene.

7. The water-and oil-repellent composition according to claim 1, wherein the copolymer a comprises 40 to 80% by mass of a constituent unit based on the monomer a, 10 to 70% by mass of a constituent unit based on the monomer b, 1 to 60% by mass of a constituent unit based on the monomer c, 0 to 30% by mass of a constituent unit based on the monomer d, and 0 to 15% by mass of a constituent unit based on the monomer e.

8. A method for producing a water-and oil-repellent composition, characterized by comprising: mixing and emulsifying the monomer a, the monomer B, the monomer C, the monomer d and the monomer e with the surfactant B, the chain transfer agent and the medium C, then adding the initiator, and reacting to obtain the water-repellent and oil-repellent composition.

9. A fabric treatment method comprising treating a fabric with the water-and oil-repellent composition according to any one of claims 1 to 7 and then baking the treated fabric at 60 to 120 ℃ for 3 to 30 minutes.

10. A textile product obtained using the fabric treatment method of claim 9.

Technical Field

The invention relates to the technical field of surface treatment agents, in particular to an environment-friendly low-temperature water-repellent and oil-repellent composition and a preparation method and application thereof.

Background

As a method for imparting water-and oil-repellency to the surface of an article (such as a fiber product), a method is known in which an article is treated with a water-and oil-repellent composition in which a copolymer having a constituent unit based on a monomer containing a polyfluoroalkyl group (hereinafter, a perfluoroalkyl group is referred to as a Rf group) having 8 or more carbon atoms is dispersed in a medium. Recently, however, EPA (united states environmental protection agency) has pointed out that a compound having a perfluoroalkyl group having 8 or more carbon atoms (hereinafter, the perfluoroalkyl group is referred to as an Rf group) is decomposed in the environment or in the living body, and the decomposition product is accumulated, that is, the environmental load is high. Therefore, a copolymer for a water/oil repellent composition having a constituent unit based on a monomer having an Rf group having 6 or less carbon atoms and having a constituent unit based on a monomer having an Rf group having 8 or more carbon atoms reduced as much as possible is required.

Patents CN1942541B, CN 101006149a and CN 1878846B report that a water-and oil-repellent composition with excellent stability is prepared by using a polyfluoroalkyl group or polyfluoroalkyl group with 1 to 6 carbon atoms as a polymerization monomer, and the obtained composition has good water-and oil-repellent performance, but the oil-repellent performance is not satisfactory, and when a methylolamide group-containing compound such as N-methylolacrylamide is used as a crosslinking monomer, free formaldehyde is released, which is harmful to human body. In addition, the problems of color change of fabric pigment, yellowing of fabric, scorching of fabric and the like are easily caused by high-temperature baking, so that the applicability of the waterproof and oil-proof agent on the fabric is limited. Many face fabrics, for example: wool, silk, polypropylene and the like cannot be baked at high temperature, and only can be treated by using low-temperature waterproof and oil-proof agents. Meanwhile, the low-temperature waterproof and oil-proof agent also has the effects of saving energy consumption and reducing emission. Despite the wide range of water-repellent finishing applications, low temperature crosslinking has always been a problem in the industry.

Therefore, there is a need to develop an environment-friendly low-temperature type water-and oil-repellent composition.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide an environment-friendly low-temperature water-repellent and oil-repellent composition which comprises a perfluoroalkyl group polymerization unit with the carbon number of less than 6 and a closed isocyanate polymerization unit, does not contain a hydroxymethyl amide crosslinking monomer, is environment-friendly and harmless to human bodies, has low-temperature baking performance and excellent low-temperature water resistance.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

in a first aspect, the present invention provides a water-and oil-repellent composition comprising: copolymer A, surfactant B and medium C; the comonomers of the copolymer A comprise: monomer a, monomer b, monomer c, and optionally monomer d and monomer e;

wherein: the monomer a is a (meth) acrylate having a polyfluoroalkyl group having 1 to 6 carbon atoms;

the monomer b is a (meth) acrylate having no perfluoroalkyl group but having an alkyl group of 16 to 28 carbon atoms;

the monomer c is a double-bond-containing blocked isocyanate;

the monomer d is acrylate containing an aliphatic ring or/and an aromatic ring structure;

the monomer e is another functional monomer.

Further, the structure of the monomer c is shown as the formula (I):

wherein R is₁is-COOCH₂CH₂-；R₂Is methyl or a hydrogen atom; r', R₆～R₁₀Each independently is hydroxyl, hydrogen, methyl, fluorine, chlorine or bromine.

Further, the medium C comprises water and a cosolvent, and the cosolvent accounts for 10-50% of the mass of the whole composition; the copolymer A accounts for 10-40% of the mass of the whole composition; the surfactant B accounts for 1-10% of the total composition.

Further, the monomer c is selected from 4-chloro-4 '-hydroxybenzophenone-blocked isocyanoethyl (meth) acrylate, 2, 3-dihydroxybenzophenone-blocked isocyanoethyl (meth) acrylate, 2-fluoro-4' -hydroxybenzophenone-blocked isocyanoethyl (meth) acrylate, 5-bromo-2-hydroxybenzophenone-blocked isocyanoethyl (meth) acrylate, 5-bromo-2-hydroxybenzophenone-blocked isocyanoethyl (meth) acrylate, 4-hydroxy-benzophenone-blocked isocyanoethyl (meth) acrylate, 3-bromo-2', 5-dichloro-2-hydroxybenzophenone-blocked isocyanoethyl (meth) acrylate, or a combination of at least two thereof.

Further, the monomer c is obtained by reacting acryloyl isocyanate and hydroxybenzophenone.

Further, the structure of the acryloyl isocyanate is shown as formula (II):

in the formula (II), R₁is-COOCH₂CH₂-；R₂Is methyl or a hydrogen atom;

further, the structure of the hydroxybenzophenone is shown as the formula (III):

wherein R is₃～R₁₀Each independently is hydroxyl, hydrogen, methyl, fluorine, chlorine or bromine, and R₃～R₅Wherein at least one substituent is a hydroxyl group. Further, the monomer d is selected from one or a combination of at least two of cyclohexyl methacrylate, tert-butylcyclohexyl methacrylate, benzyl methacrylate, isobornyl acrylate, dicyclopentanyl methacrylate, dicyclopentanyl acrylate, dicyclopentenyl methacrylate and dicyclopentenyl acrylate.

Further, in the copolymer A, the mass percentage of the constituent unit based on the monomer a is 40 to 80%, the mass percentage of the constituent unit based on the monomer b is 10 to 70%, the mass percentage of the constituent unit based on the monomer c is 1 to 60%, the mass percentage of the constituent unit based on the monomer d is 0 to 30%, and the mass percentage of the constituent unit based on the monomer e is 0 to 15%.

In a second aspect, the present invention also provides a method for producing the above water-and oil-repellent composition, comprising: mixing and emulsifying the monomer a, the monomer B, the monomer C, the monomer d and the monomer e with the surfactant B, the chain transfer agent and the medium C, adding the initiator, and reacting to obtain the high-performance low-temperature-resistant high-pressure-resistant high-temperature-.

In a third aspect, the present invention also provides a fabric treatment method comprising treating a fabric with the above water-and oil-repellent composition and then baking the fabric at 60 to 120 ℃ for 3 to 30 minutes.

In a fourth aspect, the present invention also provides a textile product obtained using the above fabric treatment method.

Detailed description of the invention

1. Water-and oil-repellent composition

(1) Copolymer A

In the water-and oil-repellent composition, the mass percent of the copolymer A is 10-40%, preferably 15-30%.

(i) Monomer a

The monomer a is (methyl) acrylate with perfluoroalkyl with 1-6 carbon atoms;

specifically, non-limiting examples of the monomer a include: perfluorohexyl (meth) acrylate, perfluorobutyl (meth) acrylate, perfluoroheptyl (meth) acrylate, and the like.

In the copolymer a, the mass percentage of the constituent unit based on the monomer a is 40 to 80%, preferably 40 to 70%, more preferably 50 to 65%.

(ii) Monomer b

The monomer b is a (meth) acrylate having no perfluoroalkyl group but having an alkyl group with 16 to 28 carbon atoms. When the number of carbon atoms of the alkyl group is 16 or more, dynamic water repellency is good, and water repellency after air drying is good; when the number of carbon atoms in the alkyl group is 28 or less, the melting point is relatively low, and handling is easy.

The monomer b is preferably behenyl (meth) acrylate or stearyl (meth) acrylate, and particularly preferably stearyl acrylate.

The copolymer a has a mass percentage of 10 to 70%, preferably 15 to 60%, more preferably 15 to 45%, based on the constituent unit of the monomer b.

(iii) Monomer c

The monomer c is a double-bond-containing blocked isocyanate, and the structure of the monomer c is shown as the following formula:

wherein R is₁is-COOCH₂CH₂-；R₂Is methyl or a hydrogen atom; r', R₆～R₁₀Each independently is hydroxyl, hydrogen, methyl, fluorine, chlorine or bromine.

The blocked isocyanate group in the monomer c can be combined with a hydroxyl group on a fabric during low-temperature baking to form a stable covalent bond, so that the composition can be endowed with an excellent low-temperature waterproof effect.

Non-limiting examples of the monomer c include: 4-chloro-4 ' -hydroxybenzophenone-blocked isocyanatoethyl (meth) acrylate, 2, 3-dihydroxybenzophenone-blocked isocyanatoethyl (meth) acrylate, 2-fluoro-4 ' -hydroxybenzophenone-blocked isocyanatoethyl (meth) acrylate, 5-bromo-2-hydroxybenzophenone-blocked isocyanatoethyl (meth) acrylate, 4-hydroxy-benzophenone-blocked isocyanatoethyl (meth) acrylate, 3-bromo-2 ', 5-dichloro-2-hydroxybenzophenone-blocked isocyanatoethyl (meth) acrylate, and the like.

Preferably, the monomer c is selected from one or a combination of two of 4-hydroxybenzophenone-blocked isocyanoethyl (meth) acrylate, 5-bromo-2-hydroxybenzophenone-blocked isocyanoethyl acrylate, 4-chloro-4 '-hydroxybenzophenone-blocked isocyanoethyl (meth) acrylate, and 2-fluoro-4' -hydroxybenzophenone-blocked isocyanoethyl (meth) acrylate.

In the copolymer a, the constituent unit based on the monomer c accounts for 1 to 60% by mass, preferably 3 to 40% by mass, more preferably 3 to 10% by mass.

If the content of the monomer c exceeds 60 percent, the content of (methyl) acrylate of perfluoroalkyl in the copolymer A is reduced, and the water and oil repellent performance of the composition is influenced; if the content of the monomer c is less than 1 percent, the bonding degree of isocyanate and the hydroxyl of the fabric is not enough, and the low-temperature crosslinking effect cannot be achieved.

The monomer c is obtained by reacting acryloyl isocyanate and hydroxybenzophenone.

The structure of the acryloyl isocyanate is shown as the formula (II):

wherein R is₁is-COOCH₂CH₂-；R₂Is a methyl group or a hydrogen atom.

The structure of the hydroxybenzophenone is shown as the formula (III):

wherein R is₃～R₁₀Each independently is hydroxyl, hydrogen, methyl, fluorine, chlorine or bromine, and R₃～R₅Wherein at least one substituent is a hydroxyl group.

In particular, non-limiting examples of the hydroxybenzophenones include: 4-hydroxybenzophenone, 4-chloro-4 ' -hydroxybenzophenone, 2, 3-dihydroxybenzophenone, 2-fluoro-4 ' -hydroxybenzophenone, 5-bromo-2-hydroxybenzophenone, 3-bromo-2 ', 5-dichloro-2-hydroxybenzophenone, and the like.

Specifically, the preparation process of the monomer c is as follows:

the hydroxybenzophenone shown as the formula (III) and the p-tert-butyl catechol were added to a 250mL four-necked flask, and the acryloyl isocyanate shown as the formula (II) and dibutyltin dilaurate were weighed and added dropwise to the four-necked flask via a dropping funnel. Dropping at 55 deg.C, controlling the temperature between 55-65 deg.C, dropping within 5-6 hr, heating to 60-65 deg.C, and stirring for 4 hr. Cooling to room temperature, washing with water for three times, adding anhydrous calcium chloride, and vacuum drying for 24 hr.

(iiii) monomer d

The monomer (d) is acrylate containing an aliphatic ring or/and aromatic ring structure, and the cyclic structure is not beneficial to free rotation of molecular chains due to large steric hindrance, is beneficial to enhancing the rigidity of the molecular chains, and can enhance the waterproof effect of the polymer under the low-temperature condition.

Examples of the alicyclic ring include saturated or unsaturated monocyclic, polycyclic or bridged rings, and saturated aliphatic rings are preferred. Specific examples of the alicyclic ring include, but are not limited to: cyclohexyl, t-butylcyclohexyl, isobornyl, dicyclopentyl, dicyclopentenyl, and the like.

The aromatic ring refers to a ring having aromaticity. Examples of the aromatic ring include monocyclic, polycyclic or heterocyclic rings having aromaticity. From the viewpoint of easy degradation, monocyclic rings having aromatic properties, such as benzene rings, etc., are preferred.

Specifically, non-limiting examples of the monomer d include: cyclohexyl methacrylate, t-butylcyclohexyl methacrylate, benzyl methacrylate, isobornyl acrylate, dicyclopentanyl methacrylate, dicyclopentanyl acrylate, dicyclopentenyl methacrylate, dicyclopentenyl acrylate, and the like.

The copolymer A contains 0 to 30 mass%, preferably 1 to 20 mass%, and more preferably 5 to 15 mass% of constituent units based on the monomer d.

If the content of the monomer d exceeds 30 percent, the molecular chain rigidity is too strong, the solubility is poor, the stability of the emulsion of the composition is influenced, the hand feeling of the treated fabric is hard, and the softness of the fabric is influenced; if the monomer d is not added, the low-temperature waterproof effect cannot be enhanced.

(iiii iii) monomer e

The monomer e is other cross-linking functional monomers except the monomer a, the monomer b, the monomer c and the monomer d.

Specifically, non-limiting examples of the monomer e include: 3-methacryloxypropyltrimethoxysilane, vinyltrimethoxysilane, dimethylaminoethyl (meth) acrylate, diethylaminoethyl (meth) acrylate, dimethylaminopropyl (meth) acrylate, (meth) acrylmorpholine, chlorinated (meth) acryloyloxyethyltrimethylamine, chlorinated (meth) acryloyloxypropyltrimethylamine, glycidyl (meth) acrylate, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 3-chloro-2-hydroxypropyl methacrylate, polyoxyalkylene glycol mono (meth) acrylate, (meth) acrylic acid, 2- (meth) acryloyloxyethylacrylic acid, 2- (meth) acryloyloxyhexahydrophthalic acid, dimethylaminoethylmethacrylate, dimethylcarbamoyloxyethyltrimethylacrylate, dimethylcarbamoyloxyethyltrimethylamine, 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 2- (meth) acryloyloxyethyl acid phosphate, allyl (meth) acrylate, 2-vinyl-2-oxazoline, 2-vinyl-4-methyl- (2-vinyloxazoline), polycaprolactone of hydroxyethyl (meth) acrylate, 2- (2-methyl-1-oxy-2-propenyl) oxyethyl 3-oxybutyrate, and the like.

Preferably, the monomer e is 2-hydroxyethyl (meth) acrylate, glycidyl (meth) acrylate, 3-chloro-2-hydroxypropyl methacrylate or a polycaprolactone of hydroxyethyl (meth) acrylate.

The copolymer A contains 0 to 15 mass%, preferably 1 to 10 mass%, and more preferably 1 to 5 mass% of the constituent unit based on the monomer e.

It is noted that in the experimental process, the inventor finds that when the monomer c and the monomer d are used together, the obtained water-repellent and oil-repellent composition can enable the treated cotton cloth to show a good water-repellent effect at a low temperature of 60 ℃ and have excellent water-repellent and oil-repellent effects at 80 ℃ and 100 ℃. However, the specific reason is not clear.

(2) Surfactant B

The surfactant may, for example, be a hydrocarbon surfactant, and each may, for example, be a nonionic surfactant, a cationic surfactant or an amphoteric surfactant.

The surfactant is preferably a combination of a nonionic surfactant and a cationic surfactant or an amphoteric surfactant, or an anionic surfactant alone, and more preferably a combination of a nonionic surfactant and a cationic surfactant, from the viewpoint of dispersion stability.

The ratio of the nonionic surfactant to the cationic surfactant expressed as nonionic surfactant/cationic surfactant is preferably 97:3 to 4:60 in terms of mass ratio.

Non-limiting examples of nonionic surfactants include: sorbitan monolaurate, sorbitan monostearate, sorbitan monopalmitate, sorbitan monooleate, sorbitan sesquistearate, sorbitan tristearate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan tristearate, and the like.

Examples of the nonionic surfactant include an epoxide adduct of a linear and/or branched saturated and/or unsaturated aliphatic group, a polyalkylene glycol ester of a linear and/or branched saturated and/or unsaturated fatty acid, a Polyoxyethylene (POE)/polyoxypropylene (POP) copolymer (a random copolymer or a block copolymer), and an epoxide adduct of acetylene glycol. Among them, it is preferable that the structures of the epoxide addition moiety and the polyalkylene glycol moiety are Polyoxyethylene (POE) or polyoxypropylene (POP) or POE/POP copolymer (random copolymer or block copolymer).

Cationic surfactants are quaternary ammonium salts, non-limiting examples of which include: dodecyl trimethyl ammonium acetate, tetradecyl trimethyl ammonium chloride, hexadecyl trimethyl ammonium bromide, octadecyl trimethyl ammonium chloride, docosyl trimethyl ammonium chloride, (dodecyl methyl) trimethyl ammonium chloride, didodecyl dimethyl ammonium chloride, dioctadecyl dimethyl ammonium chloride, benzyl dodecyl dimethyl ammonium chloride, benzyl tetradecyl dimethyl ammonium chloride, benzyl octadecyl dimethyl ammonium chloride, and the like.

Non-limiting examples of amphoteric surfactants include: alkyl betaines, alkyl thiobetaines, fatty acid amide propyl betaines, 2-alkyl-N-carboxymethyl-N-hydroxyethyl imidazolium betaines, alkyl (or dialkyl) diethylene triamine acetic acids, alkyl amide oxides, and the like.

The amount of the surfactant to be used is 1 to 10%, preferably 2 to 8% by mass of the whole water-and oil-repellent composition.

(3) Medium C

The medium C comprises water and a cosolvent.

The cosolvent is preferably a water-soluble organic solvent, such as ketones, alcohols, ethers, and the like.

In particular, non-limiting examples of the co-solvent include: acetone, methyl ethyl ketone, ethanol, propanol, isopropanol, n-butanol, isobutanol, 3-methoxy-3-methyl-1-butanol, 2-t-butoxyethanol, ethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, tetrapropylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol dibutyl ether, dipropylene glycol monomethyl ether, tripropylene glycol monomethyl ether, polyethylene glycol 200, polyethylene glycol 400, polyethylene glycol 800, and the like.

The amount of the cosolvent used is 10 to 50%, preferably 10 to 30% by mass of the whole water-and oil-repellent composition.

2. Water-and oil-repellent composition and process for producing the same

The method for producing the water-and oil-repellent composition comprises:

mixing and emulsifying the monomer a, the monomer B, the monomer C, the monomer d and the monomer e with the surfactant B, the chain transfer agent and the medium C, then adding the initiator, and reacting to obtain the water-repellent and oil-repellent composition.

The chain transfer agent is alkyl mercaptan, and the carbon atom number of the alkyl group is 10-18. Examples thereof include: n-dodecyl mercaptan, n-tetradecyl mercaptan, n-hexadecyl mercaptan, and n-octadecyl mercaptan.

The initiator is an oil-soluble polymerization initiator or a water-soluble polymerization initiator.

In some embodiments, the initiator is selected from 2, 2-azobisisobutyronitrile, benzamide peroxide, di-t-butyl peroxide, ammonium persulfate, potassium persulfate, or azobisisobutyramidine hydrochloride.

In order to obtain a polymer dispersed in water excellent in storage stability, it is desirable that monomers are finely emulsified in water by using an emulsifier capable of applying strong shear energy (for example, a high-pressure homogenizer and an ultrasonic homogenizer), followed by polymerization using a water-soluble polymerization initiator.

On the other hand, if necessary, other auxiliary agents may be added, and they are usually added to the composition after the copolymer a is produced by polymerization of the monomers.

Examples of the other auxiliary agents include a penetrant, an antifoaming agent, a water absorbing agent, an antistatic polymer, a wrinkle preventing agent, a texture adjusting agent, a film forming aid, a water-soluble polymer (such as polyacrylamide and polyvinyl alcohol), and a curing agent. Heat curing catalysts, crosslinking catalysts, synthetic resins, fiber stabilizers, inorganic particulates, and the like.

On the other hand, if necessary, a water-repellent compound containing a copolymer other than the copolymer a which exhibits water repellency and/or oil repellency (for example, a commercially available water-repellent agent, a commercially available oil-repellent agent, and a commercially available water-repellent oil-repellent agent), a fluorine atom-free water-repellent compound, or the like may be added. Examples of the water repellent compound containing no fluorine atom include paraffin compounds, aliphatic polyamide compounds, alkyl ethylene urea compounds, and siloxane compounds.

3. Fabric aftertreatment

The composition provided by the technical scheme of the invention is aqueous emulsion, and the treatment substrate of the composition is not limited, and examples of the substrate comprise fabric, leather, paper, glass, wood and the like. Among them, it is particularly effective for fabrics.

Specifically, the fabric may be treated with a water and oil repellent composition and then baked at 60 to 120 ℃ for 3 to 30 minutes.

The "treatment" means applying the water-and oil-repellent composition provided by the present invention to a substrate by dip coating or spray coating or the like.

The invention has the beneficial effects that:

(1) the water-repellent and oil-repellent composition provided by the invention uses perfluoroalkyl group polymerization monomers with the carbon number less than 6, does not contain hydroxymethyl amide crosslinking monomers, is environment-friendly and harmless to human bodies;

(2) the water-repellent and oil-repellent composition provided by the invention uses the double-bond-containing enclosed isocyanate monomer, can be crosslinked at low temperature and combined with hydroxyl on cotton fabrics, so that negative effects caused by high-temperature baking are avoided;

(3) the water-repellent and oil-repellent composition provided by the invention uses the combination of the cyclic structure monomer and the double bond-containing closed isocyanate monomer, and can further enhance the waterproof effect of the polymer under the low-temperature condition.

Drawings

FIG. 1: and (3) infrared diagrams before and after the monomer 4-hydroxy-benzophenone closed isocyano ethyl acrylate synthesis reaction.

Detailed Description

The following are preferred embodiments of the present invention, and the present invention is not limited to the following preferred embodiments. It should be noted that, for those skilled in the art, on the basis of the inventive concept herein, several variations and modifications are possible which fall within the scope of the invention, and for further description of the invention, reference is made to the following description of specific embodiments.

Synthesis of monomer c:

according to the materials and the dosage in the table 1, hydroxybenzophenone and p-tert-butylcatechol were added into a 250mL four-necked bottle, and acryloyl isocyanate and dibutyltin dilaurate were weighed and added dropwise into the four-necked bottle by using a dropping funnel. Dropping at 55 deg.C, controlling the temperature between 55-65 deg.C, dropping within 5-6 hr, heating to 60-65 deg.C, and stirring for 4 hr. Cooling to room temperature, washing with water for three times, adding anhydrous calcium chloride, and vacuum drying for 24 hr.

TABLE 1 specific materials and amounts for the synthesis of the monomers c

FIG. 1 is an infrared image of a monomer 4-hydroxy-benzophenone blocked isocyano ethyl acrylate before and after a synthesis reaction, 2264.77cm^-1The isocyanate peak position is the characteristic peak position of isocyanate, the isocyanate peak position before synthesis has higher strength, and the peak position disappears after reaction, which indicates that the reaction is complete.

Comparative examples 1 to 3

The preparation method comprises the following steps: adding a monomer a, a monomer B, a monomer c, a monomer d, a monomer e, a surfactant B, a chain transfer agent, a cosolvent and water in tables 2 to 4 into a reaction kettle, stirring and heating to 60 ℃, then pouring into a high-speed dispersant for pre-emulsification, pouring into the reaction kettle, heating to 80 ℃, stirring and dropwise adding an initiator, then keeping the temperature at 80 ℃ and reacting for 8 hours to obtain a final product emulsion, namely the water-repellent and oil-repellent composition.

Table 2 formula of materials for comparative example 1

Table 3 formula of materials for comparative example 2

Name of material	Dosage per gram	Type (B)
			Perfluorohexyl methacrylate ethyl ester	55	Reactive monomers a
Octadecyl acrylate	24	Reactive monomers b
			4-chloro-4' -hydroxybenzophenone blocked isocyanoacetic ethyl methacrylate	7	Reactive monomers c
Methacrylic acid benzyl ester	0	Reaction monomer d
			Glycidyl methacrylate	4	Reaction monomer e
Tween-80	6	Surfactant B
			Cetyl trimethyl ammonium Bromide	4	Surfactant B
Polyethylene glycol 400	20	Medium C cosolvent
			Dipropylene glycol monomethyl ether	20	Medium C cosolvent
N-dodecyl mercaptan	0.05	Chain transfer agent
			DetachmentSub-water	200	Medium C
2, 2-azobisisobutylamidine hydrochloride	1	Initiator

Table 4 formula of materials for comparative example 3

Name of material	Dosage per gram	Type (B)
			Perfluorohexyl methacrylate ethyl ester	55	Reactive monomers a
Octadecyl acrylate	31	Reactive monomers b
			4-chloro-4' -hydroxybenzophenone blocked isocyanoacetic ethyl methacrylate	0	Reactive monomers c
Methacrylic acid benzyl ester	0	Reaction monomer d
			Glycidyl methacrylate	4	Reaction monomer e
Tween-80	8	Surfactant B
			Cetyl trimethyl ammonium Bromide	4	Surfactant B
Polyethylene glycol 400	22	Medium C cosolvent
			Dipropylene glycol monomethyl ether	22	Medium C cosolvent
N-dodecyl mercaptan	0.05	Chain transfer agent
			Deionized water	200	Medium C
2, 2-azobisisobutylamidine hydrochloride	1	Initiator