阅读说明：本技术 水性聚氨酯脲分散体 (Aqueous polyurethane urea dispersions ) 是由 金晨 朱英丹 E·阿夫托莫诺夫 于 2020-03-23 设计创作，主要内容包括：本发明涉及水性聚氨酯脲分散体及其制备方法,包含其的粘合剂,以及粘合剂粘结得到的粘合制品。该水性聚氨酯脲分散体包含分散在其中的聚氨酯脲,聚氨酯脲由包含下列组分的体系反应得到：一多异氰酸酯混合物；一熔融温度大于32℃的聚酯多元醇,熔融温度使用Perkin-Elmer公司的DSC-7根据DIN 65467在20℃-100℃测得,取自第一次升温曲线；一乳化剂；可选的一单羟基聚醚和可选的一二胺；多异氰酸酯混合物包含六亚甲基二异氰酸酯和二环己基甲烷二异氰酸酯,六亚甲基二异氰酸酯的量为0.01重量%-25重量%,二环己基甲烷二异氰酸酯的量为0.01重量%-6重量%,以所述体系的量为100重量%计。包含本发明的水性聚氨酯脲分散体的粘合剂具有低活化温度和良好的机械性能。(The present invention relates to aqueous polyurethaneurea dispersions and methods of making the same, adhesives comprising the same, and adhesive articles bonded by the adhesives. The aqueous polyurethaneurea dispersion includes a polyurethaneurea dispersed therein, the polyurethaneurea being obtained by reacting a system comprising: a polyisocyanate mixture; a polyester polyol having a melting temperature of greater than 32 ℃ as measured using a DSC-7 from Perkin-Elmer company in accordance with DIN 65467 at 20 ℃ to 100 ℃ from a first temperature rise curve; an emulsifier; optionally a monohydroxy polyether and optionally a diamine; the polyisocyanate mixture comprises hexamethylene diisocyanate and dicyclohexylmethane diisocyanate, the amount of hexamethylene diisocyanate being between 0.01% and 25% by weight and the amount of dicyclohexylmethane diisocyanate being between 0.01% and 6% by weight, based on 100% by weight of the system. The adhesives comprising the aqueous polyurethane urea dispersions of the invention have a low activation temperature and good mechanical properties.)

1. An aqueous polyurethaneurea dispersion comprising a polyurethaneurea dispersed therein, the polyurethaneurea being obtained from the reaction of a system comprising:

A) a polyisocyanate mixture;

B) a polyester polyol having a melting temperature of greater than 32 ℃ as measured using a DSC-7 from Perkin-Elmer company in accordance with DIN 65467 at 20 ℃ to 100 ℃ from a first temperature rise curve;

C) an emulsifier;

D) optionally a monohydroxy polyether; and

E) optionally a diamine;

characterized in that the polyisocyanate mixture comprises hexamethylene diisocyanate and dicyclohexylmethane diisocyanate, the amount of hexamethylene diisocyanate being between 0.01% and 25% by weight and the amount of dicyclohexylmethane diisocyanate being between 0.01% and 6% by weight, based on 100% by weight of the system.

2. The dispersion according to claim 1, wherein the sum of the amounts of hexamethylene diisocyanate and dicyclohexylmethane diisocyanate is more than 50% by weight, preferably from 60% by weight to 100% by weight, most preferably from 80% by weight to 100% by weight, based on 100% by weight of the polyisocyanate mixture.

3. The dispersion according to claim 1, wherein the amount of dicyclohexylmethane diisocyanate is between 0.1% and 5.5% by weight, preferably between 0.1% and 3.5% by weight, further preferably between 0.5% and 3.5% by weight, most preferably between 0.5% and 2% by weight, based on 100% by weight of the system.

4. The dispersion of claim 1, wherein the polyester polyol has a melting temperature greater than 32 ℃ and less than 100 ℃, most preferably greater than 40 ℃ and less than 60 ℃, as measured using DSC-7 from Perkin-Elmer to DIN 65467 at 20 ℃ to 100 ℃, taken from the first temperature rise curve.

5. The dispersion of claim 1 or 4, wherein the polyester polyol has a number average molecular weight of 400-.

6. The dispersion of claim 1, wherein the emulsifier is a sulfonic acid compound.

7. The dispersion of claim 1, wherein the system does not comprise free organic amine.

8. The dispersion of claim 1, wherein the system does not comprise an amine compound having an amino functionality greater than 2.

9. Process for the preparation of an aqueous polyurethaneurea dispersion according to any of claims 1 to 8, comprising the steps of:

a. reacting some or all of the polyisocyanate mixture, the polyester polyol having a melting temperature greater than 32 ℃, and optionally a monohydroxy polyether to obtain a prepolymer, the reaction being carried out in the presence of or after the optional water-miscible, isocyanate-group-inert solvent to dissolve the prepolymer;

b. reacting said prepolymer, emulsifier, polyisocyanate mixture not added in said step a, polyester polyol not added in said step a having a melting temperature greater than 32 ℃, optional monohydroxy polyether not added in said step a, and optional diamine to obtain said polyurethaneurea; and

c. introducing water and optionally an emulsifier before, during or after step b to obtain the aqueous polyurethaneurea dispersion.

10. An adhesive comprising the aqueous polyurethaneurea dispersion of any one of claims 1-8.

11. An adhesive article comprising substrates bonded with the adhesive of claim 10.

12. The adhesive article of claim 11, wherein the substrate is one or more of: rubber, plastic, paper, cardboard, wood, textiles, metals, alloys, fabrics, fibers, artificial leather, inorganic materials, human or animal hair and human or animal skin, most preferably one or more of the following: rubber and plastic.

13. The adhesive article of claim 11 wherein the adhesive article is a shoe sole or a shaft.

14. The adhesive article of claim 11 wherein the adhesive article is a film or wood.

15. Use of the aqueous polyurethaneurea dispersion of any of claims 1-8 in the production of an adhesive article.

Technical Field

The present invention relates to aqueous polyurethaneurea dispersions and methods of making the same, adhesives comprising the same, and adhesive articles bonded by the adhesives.

Background

When aqueous polyurethane urea dispersions are used as adhesives for bonding substrates, heat activation methods are often used. In this method, an aqueous polyurethane urea dispersion is applied to a substrate, and when water in the dispersion is completely evaporated, the adhesive is activated by heating to have tackiness, and the heating method may be an infrared radiator. The temperature at which the adhesive turns tacky is referred to as the activation temperature of the adhesive. If the activation temperature of the adhesive is high, this means that the energy required for activation of the adhesive is high and manual bonding becomes impossible, and therefore it is generally desirable in the industry to have a lower activation temperature for the adhesive.

US4870129 discloses an adhesive based on an aqueous polyurethane urea dispersion obtained by reaction of hexamethylene diisocyanate and isophorone diisocyanate suitable for thermal activation process, the activation temperature of the adhesive being from 40 ℃ to 80 ℃.

EP-A0304718 discloses an adhesive in which the aqueous polyurethane urea dispersion is obtained by reaction of a mixture comprising a specific amino compound which is a primary and/or secondary monoamino compound, optionally in admixture with a primary and/or secondary diamino compound having an average amino functionality of from 1 to 1.9. The equivalent ratio of isocyanate groups of the isocyanate prepolymer in the reaction to the total amount of hydrogen atoms reactive toward isocyanates is from 0.5:1 to 0.98: 1.

US8557387 discloses an adhesive wherein an aqueous polyurethaneurea dispersion is obtained by reaction of an amino mixture comprising an amino functionality of 1.65 to 1.95 with a prepolymer having an isocyanate group content of 1.04 to 1.9 based on the amount of isocyanate-reactive amino compounds and isocyanate-reactive hydroxyl compounds.

The above adhesives all have a low activation temperature but poor mechanical properties, in particular in the inability to combine high elongation at break with high tensile strength.

US6017997 discloses an aqueous polyurethane urea dispersion prepared by reaction of a polymer polyol containing two or more active hydrogens, the polymer polyol being liquid below 32 ℃. The film formed by the aqueous polyurethane urea dispersion has good mechanical property, the tensile strength is more than 24MPa, and the 100% modulus is less than 3.1 MPa. However, the aqueous polyurethane urea dispersions are not suitable for thermal activation and therefore cannot be used in the field of adhesives.

Accordingly, there is a desire in the industry to develop an adhesive that has both a low activation temperature and good mechanical properties, in particular, high elongation at break and high tensile strength.

Disclosure of Invention

The invention aims to provide an aqueous polyurethane urea dispersion, a preparation method thereof, an adhesive containing the aqueous polyurethane urea dispersion and an adhesive product obtained by bonding the adhesive.

The aqueous polyurethaneurea dispersion according to the present invention comprises a polyurethaneurea dispersed therein, the polyurethaneurea being obtained by reacting a system comprising:

A) a polyisocyanate mixture;

B) a polyester polyol having a melting temperature of greater than 32 ℃ as measured using a DSC-7 from Perkin-Elmer company in accordance with DIN 65467 at 20 ℃ to 100 ℃ from a first temperature rise curve;

C) an emulsifier;

D) optionally a monohydroxy polyether; and

E) optionally a diamine;

the polyisocyanate mixture comprises hexamethylene diisocyanate and dicyclohexylmethane diisocyanate, the hexamethylene diisocyanate being present in an amount of 0.01% to 25% by weight and the dicyclohexylmethane diisocyanate being present in an amount of 0.01% to 6% by weight, based on 100% by weight of the system.

According to one aspect of the present invention, there is provided a process for preparing an aqueous polyurethaneurea dispersion according to the present invention, comprising the steps of:

a. reacting some or all of the polyisocyanate mixture, the polyester polyol having a melting temperature greater than 32 ℃, and optionally a monohydroxy polyether to obtain a prepolymer, the reaction being carried out in the presence of or after the optional water-miscible, isocyanate-group-inert solvent to dissolve the prepolymer;

b. reacting said prepolymer, emulsifier, polyisocyanate mixture not added in said step a, polyester polyol not added in said step a having a melting temperature greater than 32 ℃, optional monohydroxy polyether not added in said step a, and optional diamine to obtain said polyurethaneurea; and

c. introducing water and optionally an emulsifier before, during or after step b to obtain the aqueous polyurethaneurea dispersion.

According to yet another aspect of the present invention, there is provided an adhesive comprising the aqueous polyurethaneurea dispersion provided according to the present invention.

According to yet another aspect of the invention, there is provided an adhesive article comprising substrates bonded with an adhesive provided according to the invention.

According to a further aspect of the invention, the present invention provides the use of the aqueous polyurethaneurea dispersions provided according to the invention in the production of adhesive articles.

The activation temperature of aqueous polyurethane urea dispersions is closely related to the melting temperature of the crystalline polyester polyol from which they are made. Lower polyester polyol melting temperatures represent lower activation temperatures for aqueous polyurethaneurea dispersions.

The aqueous polyurethane urea dispersions of the invention are suitable for use in the fields of coatings, adhesives, sealants or printing inks, in particular for use as adhesives. The adhesives comprising the aqueous polyurethane urea dispersions of the invention have both a low activation temperature and good mechanical properties such as elongation at break and tensile strength.

Detailed Description

The present invention provides an aqueous polyurethaneurea dispersion comprising a polyurethaneurea dispersed therein, the polyurethaneurea being obtained from the reaction of a system comprising:

A) a polyisocyanate mixture;

B) a polyester polyol having a melting temperature of greater than 32 ℃ as measured using a DSC-7 from Perkin-Elmer company in accordance with DIN 65467 at 20 ℃ to 100 ℃ from a first temperature rise curve;

C) an emulsifier;

D) optionally a monohydroxy polyether; and

E) optionally a diamine;

the polyisocyanate mixture comprises hexamethylene diisocyanate and dicyclohexylmethane diisocyanate, the hexamethylene diisocyanate being present in an amount of 0.01% to 25% by weight and the dicyclohexylmethane diisocyanate being present in an amount of 0.01% to 6% by weight, based on 100% by weight of the system. The invention also provides a preparation method of the aqueous polyurethane urea dispersion, an adhesive containing the aqueous polyurethane urea dispersion and an adhesive product obtained by bonding the adhesive.

The aqueous polyurethane-urea dispersions of the invention include aqueous polyurethane dispersions, aqueous polyurethane-polyurea dispersions and/or aqueous polyurea dispersions.

Polyisocyanate mixtures

By polyisocyanate is meant an isocyanate having an isocyanate functionality of no greater than 2.

The sum of the amounts of hexamethylene diisocyanate and dicyclohexylmethane diisocyanate is preferably greater than 50% by weight, based on 100% by weight of the polyisocyanate mixture.

The sum of the amounts of hexamethylene diisocyanate and dicyclohexylmethane diisocyanate is further preferably 60% to 100% by weight, based on 100% by weight of the polyisocyanate mixture.

The sum of the amounts of hexamethylene diisocyanate and dicyclohexylmethane diisocyanate is most preferably 80% to 100% by weight, based on 100% by weight of the polyisocyanate mixture.

The amount of dicyclohexylmethane diisocyanate is preferably 0.1% to 5.5% by weight, based on 100% by weight of the system.

The amount of dicyclohexylmethane diisocyanate is further preferably 0.1% to 3.5% by weight, based on 100% by weight of the system.

The amount of dicyclohexylmethane diisocyanate is even more preferably between 0.5% and 3.5% by weight, based on 100% by weight of the system.

The amount of dicyclohexylmethane diisocyanate is most preferably 0.5% to 2% by weight, based on 100% by weight of the system.

The amount of hexamethylene diisocyanate is preferably 0.1% to 12% by weight, based on 100% by weight of the system.

The amount of hexamethylene diisocyanate is further preferably from 7% to 12% by weight, based on 100% by weight of the system.

The amount of hexamethylene diisocyanate is most preferably 8% to 9.5% by weight, based on 100% by weight of the system.

The polyisocyanate mixture may further comprise an additional polyisocyanate. The other polyisocyanate is preferably one or more of the following: aliphatic isocyanates, cycloaliphatic isocyanates, araliphatic isocyanates and aromatic isocyanates.

The aliphatic isocyanate may be one or more of the following: butene diisocyanate, 2, 4-trimethylhexamethylene diisocyanate, 2,4, 4-trimethyl-1, 6-hexamethylene diisocyanate and 1, 8-diisocyanato-4- (isocyanatomethyl) octane.

The cycloaliphatic isocyanate may be one or more of the following: isophorone diisocyanate (IPDI), the isomeric bis (4, 4' -isocyanatocyclohexyl) methanes, and 1, 4-cyclohexylene diisocyanate.

The araliphatic isocyanate may be one or more of the following: m-xylylene diisocyanate (m-XDI), p-xylylene diisocyanate (p-XDI), m-tetramethylxylylene diisocyanate (m-TMXDI), p-tetramethylxylylene diisocyanate (p-TMXDI), 1, 3-bis (isocyanatomethyl) -4-toluene, 1, 3-bis (isocyanatomethyl) -4-ethylbenzene, 1, 3-bis (isocyanatomethyl) -5-toluene, bis (isocyanatomethyl) -2, 5-xylene, 1, 4-bis (isocyanatomethyl) -2,3,5, 6-durene, 1, 4-bis (isocyanatomethyl) -5-tributylbenzene, bis (isocyanatomethyl) -4-chlorobenzene, toluene, xylene, or mixtures of the like, 1, 3-bis (isocyanatomethyl) -4, 5-dichlorobenzene, 1, 3-bis (isocyanatomethyl) -2,4,5, 6-tetrachlorobenzene, 1, 4-bis (isocyanatomethyl) -2,3,5, 6-tetrabromobenzene, 1, 4-bis (isocyanatomethyl) benzene and 1, 4-bis (isocyanatomethyl) naphthalene.

The aromatic isocyanate may be one or more of the following: 1, 4-diisocyanatobenzene, 2, 4-diisocyanatotoluene, 2, 6-diisocyanatotoluene, 1, 5-naphthalene diisocyanate, 2,4 '-diphenylmethane diisocyanate and 4, 4' -diphenylmethane diisocyanate.

The amount of the polyisocyanate mixture is preferably 5% to 30% by weight, most preferably 8% to 15% by weight, based on 100% by weight of the system.

Polyester polyol with melting temperature of more than 32 DEG C

The polyester polyols are preferably those having a melting temperature of greater than 32 ℃ and less than 100 ℃ as determined in accordance with DIN 65467 using DSC-7 from Perkin-Elmer at 20 ℃ to 100 ℃ from the first temperature rise profile.

The polyester polyols are most preferably those having a melting temperature of more than 40 ℃ and less than 60 ℃ as determined in accordance with DIN 65467 using DSC-7 from Perkin-Elmer at 20 ℃ to 100 ℃ from the first temperature rise curve.

The polyester polyol preferably has a number average molecular weight of 400-.

The polyester polyol most preferably has a number average molecular weight of 900-.

The hydroxyl group (OH) functionality of the polyester polyol is preferably 1.8 to 2.2.

The polyester polyol is preferably 1, 4-butanediol polyadipate diol.

Polyester polyol having a melting temperature of not more than 32 DEG C

The system may further comprise a polyester polyol having a melting temperature of no greater than 32 ℃.

The total amount of all polyester polyols in the system is preferably from 70% to 94% by weight, based on 100% by weight of the system.

The polyester polyol having a melting temperature of greater than 32 ℃ is preferably present in an amount of 50 wt.% to 100 wt.%, more preferably 70 wt.% to 100 wt.%, and most preferably 90 wt.% to 100 wt.%, based on 100 wt.% of the total amount of polyester polyol in the system.

Emulsifier

The term "emulsifier" herein is a compound comprising emulsifying groups or latent emulsifying groups.

The amount of emulsifier is preferably 0.1% to 3% by weight, based on 100% by weight of the system.

The emulsifier preferably comprises at least one isocyanate-reactive group and at least one emulsifying group or latent emulsifying group.

The isocyanate-reactive groups are preferably one or more of the following: hydroxyl, mercapto and amino.

The emulsifying groups or potential emulsifying groups are preferably one or more of the following: sulfonic acid groups, carboxylic acid groups, tertiary amino groups, and hydrophilic polyethers.

The sulfonic acid groups or carboxylic acid groups can be used directly in the form of their salts, such as sulfonates or carboxylates.

The sulfonic acid or carboxylic acid groups can also be obtained by partial or complete addition of neutralizing agents during or after the preparation of the polyurethane polymer.

The neutralizing agent for salt formation is preferably one or more of the following: triethylamine, dimethylcyclohexylamine, ethyldiisopropylamine, ammonia, triethanolamine, dimethylethanolamine, sodium hydroxide, potassium hydroxide, lithium hydroxide, calcium hydroxide, and methyldiethanolamine, most preferably one or more of the following: triethylamine, dimethylethanolamine and ethyldiisopropylamine.

The emulsifier is most preferably a sulfonic acid compound.

The sulfonic acid compound is preferably one or more of the following: 2- [ (2-aminoethyl) amino ] ethanesulfonic acid, N- (3-aminopropyl) -2-aminoethanesulfonic acid, N- (3-aminopropyl) -3-aminopropanesulfonic acid and N- (2-aminoethyl) -3-aminopropanesulfonic acid.

Monohydroxy polyether

The monohydroxy polyether is preferably one or more of the following: copolymers of ethylene glycol and propylene glycol and polyethylene glycols.

The amount of the monohydroxy polyether is preferably from 0 wt% to 3 wt%, most preferably from 0.5 wt% to 3 wt%, based on 100 wt% of the system.

Diamines

The diamine is preferably one or more of the following: diaminoethane, diaminopropane, diaminobutane, diaminohexane, piperazine, 2, 5-dimethylpiperazine, 3-aminomethyl-3, 5, 5-trimethylcyclohexylamine (isophoronediamine, IPDA), 4' -diaminodicyclohexylmethane, 1, 4-diaminocyclohexane, aminoethylethanolamine, hydrazine and hydrazine hydrate.

The amount of diamine is preferably from 0% to 5% by weight, based on 100% by weight of the solid components of the system.

The amount of diamine is most preferably from 0.2% to 2.5% by weight, based on 100% by weight of the solid components of the system.

System of

The system preferably does not contain free organic amine.

The free organic amine is preferably one or more of the following: triethylamine, dimethylcyclohexylamine, ethyldiethylenepropylamine, ammonia, diethanolamine, triethanolamine, dimethylethanolamine, methyldiethanolamine and aminomethylpropanol.

The system preferably does not comprise an amine compound having an amino functionality greater than 2.

The amine compound having an amino functionality greater than 2 is preferably one or more of the following: diethylenetriamine and 1, 8-diamino-4-aminomethyloctane.

The system may further comprise an external emulsifier.

The amount of the external emulsifier is preferably from 0.001% to 10% by weight, based on 100% by weight of the system.

The external emulsifier is preferably a fatty alcohol polyether, most preferably one or more of the following: aliphatic ethylene glycol polyethers and aliphatic propylene glycol polyethers.

Aqueous polyurethane urea dispersions

The solid content of the aqueous polyurethane urea dispersion is preferably 20 to 70% by weight, more preferably 30 to 65% by weight, most preferably 35 to 60% by weight, based on 100% by weight of the aqueous polyurethane urea dispersion.

The pH of the aqueous polyurethane urea dispersion is preferably 6 to 7, measured at 23 ℃ using a PB-10pH meter from Sartorius, Germany.

The particle size of the aqueous polyurethane urea dispersion is preferably 150nm-400nm, more preferably 150nm-300nm, most preferably 150nm-220nm, and is measured by using laser spectroscopy, specifically, the particle size is measured by using a Zetasizer Nano ZS 3600 laser particle sizer of Malvern instruments after the aqueous polyurethane urea dispersion is diluted by deionized water.

The aqueous polyurethane urea dispersion preferably has a viscosity of from 10mPa.s to 300 mPa.s, further preferably from 120mPa.s to 300 mPa.s, most preferably from 200mPa.s to 300 mPa.s, as measured at 23 ℃ using a Brookfield DV-II + Pro. rotational viscometer according to DIN 53019.

Process for the preparation of aqueous polyurethane urea dispersions

The aqueous polyurethane urea dispersions can be prepared in homogeneous systems via one or more stages or, in the case of a multistage reaction, partly in the disperse phase. When the reaction of step b is complete or partially complete, a dispersing, emulsifying or dissolving step is performed. And then optionally further polyaddition or modification in the dispersed phase.

The process for preparing the aqueous polyurethane urea dispersion provided according to the invention may comprise the following steps:

a. reacting a polyisocyanate mixture, a polyester polyol having a melting temperature greater than 32 ℃ and optionally some or all of a monohydroxy polyether to obtain a prepolymer, the reaction being carried out in the presence of an optional water-miscible solvent which is inert to isocyanate groups;

b. reacting said prepolymer solution, an emulsifier, a polyisocyanate mixture not added in said step a, a polyester polyol having a melting temperature greater than 32 ℃ not added in said step a, an optional monohydroxy polyether not added in said step a, and an optional diamine to obtain said polyurethaneurea; and

c. introducing water and optionally an emulsifier before, during or after step b to obtain the aqueous polyurethaneurea dispersion.

The process for preparing the aqueous polyurethane urea dispersion provided according to the invention may comprise the following steps:

a. reacting some or all of a polyisocyanate mixture, a polyester polyol having a melting temperature greater than 32 ℃, and optionally a monohydroxy polyether to obtain a prepolymer, and after the reaction, adding an optional water-miscible solvent that is inert to isocyanate groups to dissolve the prepolymer;

b. reacting said prepolymer, emulsifier, polyisocyanate mixture not added in said step a, polyester polyol not added in said step a having a melting temperature greater than 32 ℃, optional monohydroxy polyether not added in said step a, and optional diamine to obtain said polyurethaneurea; and

c. introducing water and optionally an emulsifier before, during or after step b to obtain the aqueous polyurethaneurea dispersion.

The water-miscible, but isocyanate-group-inert solvent is preferably one or more of the following: acetone, butanone, tetrahydrofuran, acetonitrile, dipropylene glycol dimethyl ether, and 1-methyl-2-pyrrolidone, with acetone and/or butanone being most preferred.

The water-miscible, but isocyanate-group-inert solvent can be reacted at normal or elevated pressure.

All processes known in the art can be used to prepare the aqueous polyurethaneurea dispersions of the present invention, such as emulsifier/shear force, acetone, prepolymer mixing, melt emulsification, ketimine, and solid spontaneous dispersion or derivatives thereof, preferably melt emulsification or acetone, most preferably acetone. These methods are summarized in Methoden der organischen Chemie (Houben-Weyl, Erweitenmgs-und zur 4. Aufiage, Volume E20, H Bartl and J. Falbe, Stuttgart, New York, Thieme 1987, p.1671-1682).

The acetone process is generally first of all introduced with all or part of the polyisocyanate and the polyester polyol having a melting temperature of greater than 32 ℃ for the reaction to prepare the prepolymer and the reaction is optionally carried out in the presence of a water-miscible solvent which is inert towards isocyanate groups, preferably without the use of a solvent but heated to a higher temperature, preferably from 50 to 120 ℃.

In order to accelerate the reaction rate in step a, catalysts customary for prepolymer preparation, such as triethylamine, 1, 4-diazabicyclo- [2,2,2] -octane, tin dioctoate or dibutyltin dilaurate, preferably dibutyltin dilaurate, may be used.

The catalyst can be placed in the reactor simultaneously with the components of step a or can be added later.

The degree of conversion of the components of step a can be obtained by testing the NCO content of the components. For this purpose, spectroscopic measurements, for example infrared or near-infrared spectroscopy, and refractive index determinations or chemical analyses, for example titration, can be carried out simultaneously on the extracted sample.

The prepolymer may be in a solid state or a liquid state.

Any potential ionic groups present in the prepolymer are converted to ionic form by partial or complete reaction with a neutralizing agent. The degree of neutralization may be 50 to 125mol%, preferably 70 to 100 mol%.

If the water for dispersion already contains a neutralizing agent, neutralization can also be carried out simultaneously with dispersion.

The equivalent ratio of the isocyanate-reactive groups of the compound for chain extension of step b to the free isocyanate groups (NCO) groups of the prepolymer may be 40 to 100mol%, preferably 50 to 100 mol%.

The components of step b can be used individually or in admixture, optionally in water-diluted or solvent-diluted form, and the order of addition can be in any order. The water or solvent content is preferably from 70 to 95% by weight, based on 100% by weight of the aqueous polyurethane urea dispersion.

Said step c may use strong shear, e.g. strong stirring.

The solvent present in the aqueous polyurethane urea dispersion can be removed by distillation. The solvent may be removed during step b or step c.

The amount of residual organic solvent in the aqueous polyurethane urea dispersion is preferably less than 1.0% by weight, based on 100% by weight of the aqueous polyurethane urea dispersion.

Composition comprising a metal oxide and a metal oxide

The composition comprising the aqueous polyurethaneurea dispersion can be a coating, an adhesive, a sealant or a printing ink.

The aqueous dispersions can be used alone or together with additives known in the art of coatings, adhesives, sealants or printing inks.

The additive may be one or more of the following: co-binders, lubricants, emulsifiers, light stabilizers, antioxidants, fillers, anti-settling agents, defoamers, wetting agents, flow control agents, antistatic agents, film-forming aids, reactive diluents, plasticizers, neutralizers, catalysts, thickeners, pigments, dyes, tackifiers, and matting agents.

The light stabilizer may be a UV absorber and/or a sterically hindered amine.

The selection and metering of the additives mentioned is known in principle and can be readily determined by the person skilled in the art.

The aqueous polyurethaneurea dispersions of the present invention can also be mixed together and used with other aqueous or solvent-containing oligomers or polymers, such as aqueous or solvent-containing polyesters, polyurethanes, polyurethane-polyacrylates, polyethers, polyester-polyacrylates, alkyds, addition polymers, polyamides/imides or polyepoxides. The compatibility of such mixtures must be tested in each case using simple preliminary tests.

The aqueous polyurethane urea dispersions of the invention can also be mixed together and used with other compounds containing functional groups, for example carboxyl, hydroxyl and/or blocked isocyanate groups.

The coatings, adhesives, sealants or printing inks according to the invention are processed according to methods known to the person skilled in the art.

Adhesive agent

The tensile strength of the film formed after drying of the adhesive is preferably more than 15MPa and less than 200MPa, more preferably 25MPa to 50MPa, still more preferably 35MPa to 50MPa, and most preferably 40 MPa to 50 MPa.

The elongation at break of the film is preferably more than 800% and less than 5000%, further preferably 1000% to 2500%, still more preferably 1800% to 2200%, most preferably 2000% to 2200%.

The 100% modulus of the film is preferably greater than 1.2MPa and less than 100MPa, most preferably from 2MPa to 5MPa, the 100% modulus being measured according to DIN53504 at 23 + -2 ℃ and 50 + -5% relative humidity.

Adhesive article

The substrate is preferably one or more of the following: rubber, plastic, paper, cardboard, wood, textiles, metals, alloys, fabrics, fibers, artificial leather, inorganic materials, human or animal hair and human or animal skin, most preferably one or more of the following: rubber and plastic.

The adhesive article is preferably a shoe sole or a shaft.

The adhesive article is preferably a film or a wood.

Examples

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In the event that a definition of a term in this specification conflicts with a meaning commonly understood by those skilled in the art to which the invention pertains, the definition set forth herein shall govern.

Unless otherwise indicated, all numbers expressing quantities of ingredients, reaction conditions, and so forth used in the specification and claims are to be understood as being modified by the term "about". Accordingly, unless indicated to the contrary, the numerical parameters set forth herein are approximations that can vary as desired.

As used herein, "and/or" means one or all of the referenced elements.

As used herein, "comprising" and "comprises" encompass the presence of only the recited elements as well as the presence of other, non-recited elements in addition to the recited elements.

All percentages in the present invention are by weight unless otherwise indicated.

The analytical measurements according to the invention were carried out at 23. + -. 2 ℃ unless otherwise stated.

The solids content of the aqueous polyurethane urea dispersions was determined using a HS153 moisture meter from Mettler Toledo according to DIN-EN ISO 3251.

The isocyanate group (NCO) content is determined volumetrically according to DIN-EN ISO 11909 and the data determined include the free and potentially free NCO content.

The particle size of the aqueous polyurethane urea dispersion was determined using laser spectroscopy (Zetasizer Nano ZS 3600 laser particle sizer from Malvern instruments) after dilution with deionized water at 23 ℃.

The viscosity of the aqueous polyurethaneurea dispersions was measured at 23 ℃ according to DIN 53019 using a Brookfield DV-II + Pro. rotational viscometer.

The pH of the aqueous polyurethaneurea dispersion was measured at 23 ℃ using a PB-10pH meter from Sartorius, Germany.

Raw materials and reagents

Polyester I: 1, 4-butanediol polyadipate diol having an OH number of 50, a melting temperature of 49 ℃, a melting enthalpy of 91.0J/g and a number average molecular weight of 2323g/mol is commercially available from Kossin GmbH, Germany.

Polyester II: polyester diols composed of 1, 6-hexanediol, neopentyl glycol and adipic acid, with an OH number of 66 and a number average molecular weight of 1691g/mol, are available from Kossi Industrie GmbH, Germany.

Desmodur^® H: 1, 6-hexamethylene diisocyanate, commercially available from Kossi Innovation, Germany.

Desmodur^®W: dicyclohexylmethane diisocyanate, available from Kossi Innovation GmbH, Germany.

L-lysine: 50% L-lysine in water, commercially available from Xiamen Crane chemical.

AAS: diamino sulfonic acid sodium NH₂-CH₂CH₂-NH-CH₂CH₂-SO₃Na, 45% concentration in water, was purchased from Colesi Indo Co.

Borchi^®Gel A LA: thickener available from OMG Borchers, Inc.

Comparative example 1

450g of polyester I and 42.5g of polyester II are dewatered at 110 ℃ for 1 hour at 15 mbar, 2.25g of 1, 4-butanediol are added and cooled with stirring. 56.8g Desmodur were added at 60 ℃^® H, stirring at 80-90 ℃ until an isocyanate content of 1.3% is reached. Then dissolved in 760g of acetone and cooled to 50 ℃ to obtain a reaction solution. A solution of 5.2g of AAS, 0.7g of dihydroxyethylamine and 4.0g L-lysine in 57 g of water was added to the reaction solution. After the resulting mixture was vigorously stirred for 30 minutes, the mixture was dispersed by adding 500g of water, followed by distilling off acetone to obtain comparative aqueous polyurethaneurea dispersion 1.

Comparative example 2

450g of polyester I and 42.5g of polyester II are dewatered at 110 ℃ for 1 hour at 15 mbar, 2.25g of 1, 4-butanediol are added and cooled with stirring. 31.3g Desmodur were added at 60 ℃^® H, and then 40.1g of Desmodur is added^® W was stirred at 80-90 ℃ until an isocyanate content of 1.3% was reached. Then dissolved in 780g of acetone and cooled to 50 ℃ to obtain a reaction solution. A solution of 5.7g AAS, 0.7g dihydroxyethylamine and 1.4g hydroxyethylethylenediamine in 59 g water was added to the reaction solution. After the resulting mixture was stirred vigorously for 30 minutes, the mixture was dispersed by adding 510g of water, followed by distillation to separate out the acetone, and gelation occurred during the distillation.

Example 1

450g of polyester I and 42.5g of polyester II are dewatered at 110 ℃ for 1 hour at 15 mbar, 2.25g of 1, 4-butanediol are added and cooled with stirring. 55.3g Desmodur were added at 60 ℃^® H, and then 2.4g of Desmodur is added^® W was stirred at 80-90 ℃ until an isocyanate content of 1.3% was reached. Then dissolved in 760g of acetone and cooled to 50 ℃ to obtain a reaction solution. A solution of 5.7g AAS, 0.7g dihydroxyethylamine and 1.4g hydroxyethylethylenediamine in 59 g water was added to the reaction solution. After the resulting mixture was vigorously stirred for 30 minutes, the mixture was dispersed by adding 500g of water, followed by distilling off acetone to obtain an aqueous polyurethaneurea dispersion 1.

Example 2

450g of polyester I and 42.5g of polyester II are dewatered at 110 ℃ for 1 hour at 15 mbar, 2.25g of 1, 4-butanediol are added and cooled with stirring. 53.0g Desmodur was added at 60 ℃^® H, and 5.9g of Desmodur is added^® W was stirred at 80-90 ℃ until an isocyanate content of 1.3% was reached. Then dissolved in 760g of acetone and cooled to 50 ℃ to obtain a reaction solution. A solution of 5.7g AAS, 0.7g dihydroxyethylamine and 1.4g hydroxyethylethylenediamine in 59 g water was added to the reaction solution. After the resulting mixture was vigorously stirred for 30 minutes, the mixture was dispersed by adding 500g of water, followed by distilling off acetone to obtain an aqueous polyurethaneurea dispersion 2.

Example 3

450g of polyester I and 42.5g of polyester II are dewatered at 110 ℃ for 1 hour at 15 mbar, 2.25g of 1, 4-butanediol are added and cooled with stirring. 45.8g Desmodur were added at 60 ℃^® H, further adding 17g of Desmodur^® W was stirred at 80-90 ℃ until an isocyanate content of 1.3% was reached. Then dissolved in 770g of acetone and cooled to 50 ℃ to obtain a reaction solution. A solution of 5.7g AAS, 0.7g dihydroxyethylamine and 1.4g hydroxyethylethylenediamine in 59 g water was added to the reaction solution. After the resulting mixture was vigorously stirred for 30 minutes, the mixture was dispersed by adding 500g of water, followed byThe acetone is separated off by distillation to give aqueous polyurethane urea dispersion 3.

Example 4

450g of polyester I and 42.5g of polyester II are dewatered at 110 ℃ for 1 hour at 15 mbar, 2.25g of 1, 4-butanediol are added and cooled with stirring. 38.4g Desmodur were added at 60 ℃^® H, and 28.6g of Desmodur is added^® W was stirred at 80-90 ℃ until an isocyanate content of 1.3% was reached. Then dissolved in 775g acetone and cooled to 50 ℃ to obtain a reaction solution. A solution of 5.7g AAS, 0.7g dihydroxyethylamine and 1.4g hydroxyethylethylenediamine in 59 g water was added to the reaction solution. After the resulting mixture was vigorously stirred for 30 minutes, the mixture was dispersed by adding 500g of water, followed by distilling off acetone to obtain an aqueous polyurethaneurea dispersion 4.

Table 1 lists the parameters of the aqueous polyurethane urea dispersions of the examples and comparative examples.

TABLE 1 parameters of aqueous polyurethaneurea dispersions

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Performance testing

Preparation method of membrane for test

Using Borchi^®Gel a LA the viscosity of the aqueous polyurethaneurea dispersions of the examples and comparative examples was adjusted to 4000mpa.s to 8000 mpa.s, stored overnight at room temperature. The aqueous polyurethane urea dispersions of the examples and comparative examples were then poured onto release paper, respectively, and a wet film was scraped onto the release paper using a 500 μm film scraper, placed in a 50 ℃ oven for 30 minutes, then placed in a 150 ℃ oven for 3 minutes, and talc was applied to both sides of the film to give test films having a film thickness of 0.17 ± 0.04 mm.

Test method

The 100% modulus, elongation at break and tensile strength of the film were determined according to DIN53504 by the following procedure: cutting the prepared film into a dumbbell shape; and the 100 modulus%, elongation at break and tensile strength of the film at 200 mm/min were measured at room temperature using a ZWICK universal material tester.

Reference value of performance

Table 2 lists the film performance references including stress, tensile strength, elongation at break, and 100% modulus.

Table 2 reference values for membrane performance

Performance of	Reference value
		stress/N/mm2	>15
Tensile strength/MPa	>15
		Elongation at break/%	>800
100% modulus/MPa	>1.2

Remarking: the greater the stress, tensile strength, elongation at break, and 100% modulus of the film, the better the mechanical properties of the film.

Table 3 is the test results of stress, tensile strength, elongation at break and 100% modulus for films made from the aqueous polyurethaneurea dispersions of examples and comparative examples.

Table 3 film performance test results

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As can be seen from examples 1 to 4, Desmodur in a system when preparing an aqueous polyurethaneurea dispersion^®W content of 0.01-6 wt%, Desmodur^®With an H content of 0.01% to 25% by weight, the films produced from the aqueous polyurethaneurea dispersions have a stress, 100% modulus and tensile strength which are considerably higher than the reference values, while maintaining a suitable elongation at break.

When the content of the Desmodur W in the system for preparing the polyurethane urea aqueous dispersion is 7 weight percent, the Desmodur^®When the H content is 5.41% by weight, the gelled aqueous polyurethane urea dispersion cannot be continued in the production process and the subsequent film-forming process. Desmodur in a system for the preparation of aqueous polyurethane urea dispersions^®The content of H was 10.15% by weight and Desmodur-free^®W, the film made from the aqueous polyurethaneurea dispersion does not meet the reference value requirements for stress, 100% modulus and tensile strength while maintaining a suitable elongation at break.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing description, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description; and therefore any changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.