CN115260950A - Bi-component water-based neoprene spray adhesive and preparation method thereof - Google Patents

Abstract

The invention relates to a bi-component water-based neoprene spray adhesive and a preparation method thereof, belonging to the technical field of spray adhesive preparation, and the bi-component water-based neoprene spray adhesive comprises the following raw materials in parts by weight: 100-150 parts of modified neoprene latex, 100-150 parts of deionized water, 45-55 parts of KH-450, 30-40 parts of styrene-acrylic emulsion, 4-8 parts of SD1688 aqueous antioxidant emulsion, 45-55 parts of aqueous rosin resin 105 and 0.2-0.6 part of low molecular weight polyamide curing agent; the modified chloroprene latex is added, the chloroprene latex contains hydrophilic acylamino and hydroxyl, and hydrophobic alkyl, phenyl and carboxylic ester, and the synergistic effect of the hydrophilic acylamino and the hydroxyl and the hydrophobic alkyl, the phenyl and the carboxylic ester improves the stability of the chloroprene spray adhesive, and simultaneously, the acylamino in the modified chloroprene latex and an N-H bond in a low molecular weight polyamide curing agent can generate a crosslinking reaction with active chlorine atoms in the modified chloroprene latex, so that the initial adhesive strength and the stability of the bi-component waterborne chloroprene spray adhesive are improved together.

Description

Bi-component aqueous neoprene spray adhesive and preparation method thereof

Technical Field

The invention belongs to the technical field of spray glue preparation, and particularly relates to a bi-component water-based neoprene spray glue and a preparation method thereof.

Background

The neoprene spraying adhesive is used as an adhesive with excellent adhesion performance, and is widely applied to adhesion of materials such as wood, glass, rubber, fabrics, leather, plastics and the like. The water-based neoprene spraying adhesive has the advantages of high safety, small pollution to the using environment, good adhesive property and the like, and is widely concerned by people.

The single-component water-based neoprene adhesive has poor water resistance and heat resistance and low bonding strength, and can not reach the performance required by practical application, and a crosslinking curing agent is often added to prepare a double-component water-based neoprene adhesive to improve the performance of the single-component water-based neoprene adhesive.

Patent CN103865439B provides a preparation method of a bi-component aqueous neoprene spray adhesive, the neoprene spray adhesive with strong initial viscosity, good heat resistance and fast drying speed is prepared by adding an aqueous curing agent, the working efficiency is improved, but the technical problems of poor stability after preparation and easy waste are still existed.

In the prior art, carboxyl graft modified neoprene latex is used as a main component, and the stability of the neoprene latex is improved by blending with functional auxiliaries such as polyoxyethylene ether sulfate, organic silicon efficient surfactant and the like, but the conventional tackifier and the surfactant have small molecular weight, cannot participate in curing reaction, are easy to migrate and separate out, and cause the poor stability of the prepared bi-component water-based neoprene spray adhesive, and the problem of poor initial viscosity of the existing bi-component water-based neoprene spray adhesive exists.

Disclosure of Invention

The invention aims to provide a bi-component water-based neoprene spraying adhesive and a preparation method thereof, which aim to solve the following technical problems:

how to improve the initial adhesive strength and stability of the bi-component water-based neoprene spraying adhesive.

The purpose of the invention can be realized by the following technical scheme:

the bi-component water-based neoprene adhesive comprises the following raw materials in parts by weight: 100-150 parts of modified neoprene latex, 100-150 parts of deionized water, 45-55 parts of KH-450, 30-40 parts of styrene-acrylic emulsion, 4-8 parts of SD1688 aqueous antioxidant emulsion, 45-55 parts of aqueous rosin resin 105 and 0.2-0.6 part of low molecular weight polyamide curing agent;

the preparation method of the modified neoprene latex comprises the following steps:

step 11, adding acetaminoacrylic acid and toluene into a reaction bottle, mechanically stirring uniformly, slowly dropwise adding 1.5mol/L sodium hydroxide aqueous solution into the reaction bottle by using a constant-pressure titrator, controlling the temperature at 45-55 ℃, continuously stirring for reaction for 2-3h, and performing reduced pressure dehydration and drying to obtain sodium acetaminoacrylate;

wherein the mass ratio of the acetaminoacrylic acid to the toluene to the 1.5mol/L sodium hydroxide aqueous solution is 10-30:150-200, taking toluene as a solvent, and performing acid-base neutralization reaction to obtain sodium acetaminoacrylate;

step 12, adding sodium acetaminoacrylate, epichlorohydrin and methanol into a reaction bottle, dropwise adding N, N-dimethylaniline by using a rubber head dropper to adjust the pH value to 7.5-8.5, mechanically stirring uniformly, dropwise adding benzyl trimethyl ammonium bromide into the reaction bottle by using a constant pressure titrator, heating to 90-100 ℃, stirring for reaction for 1-2h, performing rotary evaporation and vacuum drying to obtain an intermediate 1;

wherein the mass ratio of the sodium acetaminoacrylate to the epichlorohydrin to the methanol to the benzyltrimethylammonium bromide is 10-30:20-40:150-200:0.1-0.5, taking methanol as a solvent, and carrying out nucleophilic substitution reaction on sodium acetaminoacrylate and epichlorohydrin under the action of a phase transfer catalyst, namely benzyl trimethyl ammonium bromide to generate an intermediate 1, wherein the structural formula of the intermediate 1 is as follows:

step 13, adding the intermediate 1, THF and magnesium trifluoromethanesulfonate into a reaction bottle, performing ultrasonic dispersion, dropwise adding aniline, heating to 60-70 ℃ after dropwise adding, reacting for 2-3h, and separating by using column chromatography to obtain an intermediate 2;

wherein the mass ratio of the intermediate 1, THF, magnesium trifluoromethanesulfonate and aniline is 10-30:150-250:2-6:6-10, taking THF as a solvent and magnesium trifluoromethanesulfonate as an alkali metal catalyst, and performing nucleophilic addition reaction to enable an epoxy group to perform a ring opening reaction to obtain an intermediate 2, wherein the structural formula of the intermediate is as follows:

step 14, adding the intermediate 2 into a reaction bottle, dropwise adding benzoyl peroxide, and mechanically and uniformly stirring to obtain a mixed solution a;

wherein the mixed solution a is prepared by mixing the intermediate 2 and benzoyl peroxide according to a mass ratio of 100-300:0.01-0.03 by weight;

and step 15, adding the neoprene latex and cyclohexane into a reaction bottle for ultrasonic dispersion, dropwise adding the mixed solution a, heating to 45-55 ℃ after dropwise adding is finished, stirring for reaction for 3-4 hours, performing rotary evaporation, and performing vacuum drying to obtain the modified neoprene latex.

Wherein the mass ratio of the neoprene latex to the cyclohexane to the mixed liquid a is 30-60:200-600:100-200, taking the intermediate 2 as a grafting monomer and benzoyl peroxide as an initiator, and grafting the intermediate 2 to the neoprene latex through a free radical reaction to obtain the modified neoprene latex.

As a further scheme of the invention: the preparation method of the bi-component water-based neoprene spraying adhesive comprises the following steps:

step 21, adding deionized water and KH-450 into a three-neck flask, and mechanically stirring for 0.5-1h at room temperature to obtain a mixed solution b;

step 22, adding the modified neoprene latex and the styrene-acrylic emulsion into a three-neck flask, mechanically stirring for 1-2 hours at room temperature, dropwise adding the mixed solution b, and mechanically stirring for 2-3 hours at room temperature after dropwise adding is finished to obtain a composite emulsion;

the modified neoprene latex is used as a main component, styrene-acrylic emulsion and KH-450 are added as functional additives, and under the dispersion action of deionized water, the water-based composite emulsion with high initial viscosity is prepared.

The styrene-acrylic emulsion has high initial viscosity, and can be fully mixed with the modified chloroprene latex in the stirring process, so that the initial viscosity of the modified chloroprene latex is improved, meanwhile, the siloxane groups in the KH-450 are easy to hydrolyze into highly polar silanol, the silanol can be further condensed to crosslink the molecular chains of the modified chloroprene latex into a net structure, and the stability of the composite emulsion is further improved.

And step 23, adding the composite emulsion, the SD1688 aqueous antioxidant emulsion and the aqueous rosin resin 105 into a three-neck flask, mechanically stirring for 1-2h at room temperature, adding the low-molecular-weight polyamide curing agent, and continuously stirring for 1-2h at room temperature to obtain the bi-component aqueous neoprene adhesive.

The two-component water-based neoprene adhesive is obtained by taking low molecular weight polyamide as a curing agent and carrying out curing reaction on the water-based composite emulsion and the low molecular weight polyamide.

The aqueous composite emulsion accounts for most of the bi-component aqueous neoprene spray adhesive, the initial viscosity and the stability of the neoprene spray adhesive are mainly influenced, hydrophilic amido, hydroxyl, hydrophobic alkyl, phenyl, carboxylic ester and other groups are grafted in the aqueous composite emulsion, and the hydrophilic amido, the hydroxyl, the hydrophobic alkyl, the phenyl, the carboxylic ester and the other groups are synergistically acted to form a non-ionic surfactant, so that the surface tension of the neoprene spray adhesive is reduced, and the stability of the neoprene spray adhesive is improved.

The composite emulsion is used as a main agent, the low molecular weight polyamide is used as a curing agent, and the composite emulsion is fully contacted with the low molecular weight polyamide curing agent through mechanical stirring, so that the composite emulsion can generate an instant demulsification phenomenon to form bi-component waterborne neoprene adhesive with adhesive force; meanwhile, the molecular chain of the low molecular weight polyamide curing agent contains a plurality of N-H bonds, the N-H bonds are influenced by adjacent acyl groups, the polarity of the N-H bonds is increased, the N-H bonds are easy to break in the reaction, and the N-H bonds can perform a cross-linking reaction with active chlorine atoms and carbonyl groups in the composite emulsion to generate ammonium carboxylate salts, so that the initial viscosity and the stability of the neoprene spraying adhesive are further improved.

Further, the low molecular weight polyamide curing agent is any one of a polyamide curing agent 650 and a polyamide curing agent 651.

The invention has the beneficial effects that:

(1) Compared with the prior art, the adhesive property and stability of the bi-component neoprene sprayed adhesive prepared by the method are greatly improved, and the adhesive property and stability are specifically shown in the following steps: the initial adhesive peel strength of the sample is improved from 0.4-0.6kN/m to 1.4-1.6kN/m after the sample is naturally dried for 30min at room temperature, the final adhesive peel strength of the sample is improved from 1.3-1.6kN/m to 3.2-3.5kN/m after the sample is naturally dried for 48h at room temperature, and the sample is placed at room temperature (25 ℃,50% humidity) for 24h to improve the state of generating precipitate/gel to the state of no precipitate/gel;

(2) The intermediate 2 is grafted on the main component neoprene latex of the bi-component neoprene spraying adhesive through copolymerization reaction, so that the neoprene latex structure is asymmetric, the asymmetric structure can enhance the polarity of the neoprene latex, the strong polarity material has better viscosity, meanwhile, the intermediate 2 has hydrophilic amide group and hydroxyl group as well as hydrophobic alkyl, phenyl and carboxylic ester group, which have the property of a non-ionic surfactant through synergistic action, the non-ionic surfactant structure is grafted in the bi-component neoprene spraying adhesive, so that the surface tension of the neoprene spraying adhesive is reduced, the stability of the neoprene spraying adhesive is improved, wherein, the amide group enhances the initial viscosity and the stability of the neoprene spraying adhesive through the interaction of hydrogen bonds and dipole moment among self molecules, meanwhile, the aniline group connected with hydroxymethyl has certain alkalinity, the aniline group can react with active chlorine atoms in the neoprene spraying adhesive to generate an allylaniline compound, the allyl group containing double bonds and a benzene ring form conjugated double bonds, the surface energy of the neoprene spraying adhesive is reduced, and the stability of the neoprene spraying adhesive is further enhanced;

(3) The molecular chain of the low molecular weight polyamide curing agent contains a plurality of N-H bonds, which are influenced by adjacent acyl groups, the polarity of the N-H bonds is increased, the N-H bonds are easy to break in reaction, chlorine atoms in the composite emulsion have strong reaction activity, the N-H bonds and the chlorine atoms can react at normal temperature, the allyl groups containing double bonds are introduced into the neoprene spraying adhesive, the surface energy of the neoprene spraying adhesive is reduced, the initial viscosity and the stability of the neoprene spraying adhesive are improved, meanwhile, the N-H bonds with strong activity can also perform a cross-linking reaction with carbonyl groups in the composite emulsion to generate ammonium carboxylate, and the stability of the neoprene spraying adhesive is further improved.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The preparation method of the modified neoprene latex comprises the following steps:

step 11, adding 10g of acetaminoacrylic acid and 17mL of toluene into a reaction bottle, mechanically stirring uniformly, slowly dropwise adding 10g of 1.5mol/L sodium hydroxide aqueous solution into the reaction bottle by using a constant-pressure titrator, continuously stirring for reaction for 2 hours at the temperature of 45 ℃, and performing reduced-pressure dehydration and drying to obtain sodium acetaminoacrylate;

step 12, adding 10g of sodium acetaminoacrylate, 17mL of epoxy chloropropane and 19mL of methanol into a reaction bottle, dropwise adding N, N-dimethylaniline by using a rubber head dropper to adjust the pH value to 7.5, mechanically stirring uniformly, dropwise adding 0.1mL of benzyl trimethyl ammonium bromide into the reaction bottle by using a constant pressure titrator, heating to 90 ℃, stirring for reaction for 1h, performing rotary evaporation and vacuum drying to obtain an intermediate 1;

step 13, adding 10g of the intermediate 1, 56mL of THF and 2g of magnesium trifluoromethanesulfonate into a reaction bottle, performing ultrasonic dispersion, dropwise adding 6mL of aniline by using a constant-pressure titrator, after dropwise adding, heating to 60 ℃, reacting for 2 hours, and separating by using column chromatography to obtain an intermediate 2;

step 14, adding the intermediate 2 into a reaction bottle, dropwise adding benzoyl peroxide, and mechanically and uniformly stirring to obtain a mixed solution a, wherein the mixed solution a is prepared by mixing the intermediate 2 and the benzoyl peroxide according to a mass ratio of 100:0.1, mixing;

and step 15, adding 10mL of neoprene latex and 63mL of cyclohexane into a reaction bottle, performing ultrasonic dispersion, dropwise adding 26mL of mixed solution a, heating to 45 ℃, stirring for reaction for 3 hours, performing rotary evaporation, and performing vacuum drying to obtain the modified neoprene latex.

Example 2

The preparation method of the modified neoprene latex comprises the following steps:

step 11, adding 20g of acetaminoacrylic acid and 20mL of toluene into a reaction bottle, mechanically stirring uniformly, slowly dropwise adding 20g of 1.5mol/L sodium hydroxide aqueous solution into the reaction bottle by using a constant-pressure titrator, continuously stirring and reacting for 2.5h at the temperature of 50 ℃, and performing reduced-pressure dehydration and drying to obtain sodium acetaminoacrylate;

step 12, adding 20g of sodium acetamidopropene, 25mL of epoxy chloropropane and 22mL of methanol into a reaction bottle, dropwise adding N, N-dimethylaniline by using a rubber head dropper b to adjust the pH value to 7.5-8.5, mechanically stirring uniformly, dropwise adding 0.3mL of benzyl trimethyl ammonium bromide into the reaction bottle by using a constant pressure titrator, heating to 95 ℃, stirring for reaction for 1.5h, performing rotary evaporation and vacuum drying to obtain an intermediate 1;

step 13, adding 20g of the intermediate 1, 73mL of THF and 4g of magnesium trifluoromethanesulfonate into a reaction bottle, performing ultrasonic dispersion, dropwise adding 8mL of aniline by using a constant-pressure titrator, after dropwise adding, heating to 65 ℃, reacting for 2.5 hours, and separating by using column chromatography to obtain an intermediate 2;

step 14, adding the intermediate 2 into a reaction bottle, dropwise adding benzoyl peroxide, and mechanically and uniformly stirring to obtain a mixed solution a, wherein the mixed solution a is prepared by mixing the intermediate 2 and the benzoyl peroxide according to a mass ratio of 200:0.02 mixing;

and step 15, adding 20mL of neoprene latex and 82mL of cyclohexane into a reaction bottle, performing ultrasonic dispersion, dropwise adding 35mL of mixed solution a, heating to 50 ℃ after dropwise adding, stirring for reaction for 3.5h, performing rotary evaporation, and performing vacuum drying to obtain the modified neoprene latex.

Example 3

The preparation method of the modified neoprene latex comprises the following steps:

step 11, adding 30g of acetaminoacrylic acid and 23mL of toluene into a reaction bottle, mechanically stirring uniformly, slowly dropwise adding 30g of 1.5mol/L sodium hydroxide aqueous solution into the reaction bottle by using a constant-pressure titrator, continuously stirring for reaction for 3 hours at 55 ℃, and performing reduced-pressure dehydration and drying to obtain sodium acetaminoacrylate;

step 12, adding 30g of sodium acetamidopropene, 34mL of epoxy chloropropane and 253mL of methanol into a reaction bottle, dropwise adding N, N-dimethylaniline by using a rubber head dropper to adjust the pH value to 7.5-8.5, mechanically stirring uniformly, dropwise adding 0.5mL of benzyl trimethyl ammonium bromide into the reaction bottle by using a constant-pressure titrator, heating to 100 ℃, stirring for reaction for 2 hours, and performing rotary evaporation and vacuum drying to obtain an intermediate 1;

step 13, adding 30g of the intermediate 1, 90mL of THF (tetrahydrofuran) and 6g of magnesium trifluoromethanesulfonate into a reaction bottle, performing ultrasonic dispersion, dropwise adding 10mL of aniline by using a constant-pressure titrator, after dropwise adding, heating to 70 ℃, reacting for 3 hours, and separating by using column chromatography to obtain an intermediate 2;

step 14, adding the intermediate 2 into a reaction bottle, dropwise adding benzoyl peroxide, and mechanically and uniformly stirring to obtain a mixed solution a, wherein the mixed solution a is prepared by mixing the intermediate 2 and the benzoyl peroxide according to a mass ratio of 300:0.03 mixing;

and step 15, adding 30mL of neoprene latex and 101mL of cyclohexane into a reaction bottle, performing ultrasonic dispersion, dropwise adding 43mL of mixed solution a, heating to 55 ℃, stirring for reaction for 4 hours, performing rotary evaporation, and performing vacuum drying to obtain the modified neoprene latex.

Example 4

A preparation method of bi-component water-based neoprene spray adhesive comprises the following steps:

step 21, adding 10.8mL of deionized water and 5mL of KH-450 into a three-neck flask, and mechanically stirring at room temperature for 0.5h to obtain a mixed solution b;

step 22, adding 10mL of the modified neoprene latex prepared by the method of the embodiment 1 and 3.5mL of the styrene-acrylic emulsion into a three-neck flask, mechanically stirring for 1 hour at room temperature, dropwise adding 15.8mL of the mixed solution b, and mechanically stirring for 2 hours at room temperature after dropwise adding is finished to obtain a composite emulsion;

step 23, adding 10mL of the composite emulsion, 0.4mL of the SD1688 aqueous antioxidant emulsion and 4.5mL of the aqueous rosin resin 105 into a three-neck flask, mechanically stirring for 1h at room temperature, then adding 0.025mL of the polyamide curing agent 650, and continuously stirring for 1h at room temperature to obtain the bi-component aqueous neoprene adhesive.

Example 5

A preparation method of bi-component water-based neoprene spray adhesive comprises the following steps:

step 21, adding 15.3mL and 6.1mL KH-450 into a three-neck flask, and mechanically stirring for 0.75h at room temperature to obtain a mixed solution b;

step 22, adding 15mL of the modified neoprene latex prepared by the method of the embodiment 2 and 4mL of the styrene-acrylic emulsion into a three-neck flask, mechanically stirring for 1.5h at room temperature, dropwise adding 21.4mL of the mixed solution b, and mechanically stirring for 2.5h at room temperature after dropwise adding is finished to obtain a composite emulsion;

and step 23, adding 15mL of composite emulsion, 0.6mL of SD1688 water-based antioxidant emulsion and 6mL of water-based rosin resin 105 into a three-neck flask, mechanically stirring at room temperature for 1.5h, adding 0.05mL of polyamide curing agent 651, continuously stirring at room temperature for 1.5h, adding into the three-neck flask, and mechanically stirring at room temperature for 1h to obtain the double-component water-based neoprene adhesive.

Example 6

A preparation method of bi-component water-based neoprene spray adhesive comprises the following steps:

step 21, adding 20.3mL of deionized water and 7.5mL of KH-450 into a three-neck flask, and mechanically stirring for 1h at room temperature to obtain a mixed solution b;

step 22, adding 20mL of the modified chloroprene latex prepared in the embodiment 3 and 4.6mL of styrene-acrylic emulsion into a three-neck flask, mechanically stirring for 2h at room temperature, dropwise adding 27.8mL of the mixed solution b, and mechanically stirring for 3h at room temperature to obtain a composite emulsion;

and step 23, adding 20mL of composite emulsion, 0.6mL of SD1688 water-based antioxidant emulsion and 6.8mL of water-based rosin resin 105 into a three-neck flask, mechanically stirring for 2h at room temperature, adding 0.075mL of polyamide curing agent 650, and continuously stirring for 2h at room temperature to obtain the bi-component water-based neoprene spraying adhesive.

Comparative example 1

Adding 10mL of neoprene latex and 63mL of cyclohexane into a reaction bottle, performing ultrasonic dispersion, dropwise adding 26mL of mixed solution a, heating to 45 ℃, stirring for reaction for 3h, performing rotary evaporation, and performing vacuum drying to obtain methyl methacrylate modified neoprene latex, wherein the mixed solution a is prepared by mixing methyl methacrylate and benzoyl peroxide according to a mass ratio of 100:0.1 and mixing.

Comparative example 2

The mixed liquid a in the embodiment 2 is intermediate 2 and benzoyl peroxide according to the mass ratio of 200:0.02, and replacing with a mixed solution a which is prepared by mixing the intermediate 1 and the benzoyl peroxide according to the mass ratio of 200:0.02 and mixing.

Comparative example 3

The modified polychloroprene latex prepared in example 4 was replaced with the methyl methacrylate-modified polychloroprene latex prepared in comparative example 1, and the remaining preparation process was identical to example 4.

Comparative example 4

The modified polychloroprene latex prepared in example 5 was replaced with the modified polychloroprene latex prepared in comparative example 2, and the remaining preparation process was identical to example 5.

Performance test

Adhesion Performance test

After the surface of an aluminum alloy (LY 12-CZ) test piece is treated, spraying glue uniformly on a bonding surface by a spray gun, wherein the using amount of the glue is 3g +/-0.5 g, airing for 5min after uniform spraying, and bonding by aligning to a bonding position. Applying pressure of 0.4MPa to the bonding part for 5min. After the pressure was released, the test pieces were left to air for 30min and 48h, and the initial bond peel strength and the final bond peel strength σ (kN/m) of examples 4 to 6 and comparative examples 3 to 4 were measured in accordance with GB/T2790-1995, respectively. The results are shown in Table 1.

Stability testing

The samples prepared in examples 4 to 6 and comparative examples 3 to 4 were filled in 500mL polyethylene bottles, respectively, covered, and left at room temperature (25 ℃,50% humidity). And (4) observing whether the sample precipitates or gels within 24h by a visual method, and judging the stability of the sample. The results are shown in Table 1.

TABLE 1

As shown in Table 1, the two-component aqueous chloroprene spray adhesives prepared in examples 4 to 6 had initial tack peel strengths of 1.4 to 1.6 (kN/m) and final tack peel strengths of 3.2 to 3.5 (kN/m), while those of comparative examples 3 to 4 had initial tack peel strengths of 0.4 to 0.6 (kN/m) and final tack peel strengths of 1.3 to 1.6 (kN/m), and by observing the state change of the samples at room temperature (25 ℃ C., 50% humidity) for 24 hours, it was found that none of examples 4 to 6 had precipitates or gels, while those of comparative example 3 had precipitates and that of comparative example 4 had gels. The above data show that the two-component aqueous neoprene spray adhesives prepared in examples 4-6 have more excellent initial adhesion strength and more stable adhesion properties.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.

In the description of the specification, reference to the description of "one embodiment," "an example," "a specific example" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.

Claims (8)

1. The bi-component water-based neoprene spraying adhesive is characterized by comprising the following raw materials in parts by weight: 100-150 parts of modified neoprene latex, 100-150 parts of deionized water, 45-55 parts of KH-450, 30-40 parts of styrene-acrylic emulsion, 4-8 parts of SD1688 aqueous antioxidant emulsion, 45-55 parts of aqueous rosin resin 105 and 0.2-0.6 part of low molecular weight polyamide curing agent;

the preparation method of the modified neoprene latex comprises the following steps:

step 11, adding acetaminoacrylic acid and toluene into a reaction bottle, mechanically stirring uniformly, dropwise adding a sodium hydroxide aqueous solution with the concentration of 1.5mol/L, continuously stirring and reacting for 2-3h at 45-55 ℃, and performing reduced pressure dehydration and drying to obtain sodium acetaminoacrylate;

step 12, adding sodium acetaminoacrylate, epoxy chloropropane and methanol into a reaction bottle, dropwise adding N, N-dimethylaniline to adjust the pH value to 7.5-8.5, uniformly stirring mechanically, dropwise adding benzyl trimethyl ammonium bromide, reacting while stirring at 90-100 ℃, performing rotary evaporation and vacuum drying to obtain an intermediate 1;

step 13, adding the intermediate 1, THF and magnesium trifluoromethanesulfonate into a reaction bottle, performing ultrasonic dispersion, dropwise adding aniline, heating to 60-70 ℃ after dropwise adding, and reacting for 2-3h to obtain an intermediate 2;

step 14, adding the intermediate 2 into a reaction bottle, dropwise adding benzoyl peroxide, and mechanically and uniformly stirring to obtain a mixed solution a;

and step 15, adding the neoprene latex and cyclohexane into a reaction bottle, performing ultrasonic dispersion, dropwise adding the mixed solution a, heating to 45-55 ℃, stirring for reaction for 3-4h, performing rotary evaporation, and performing vacuum drying to obtain the modified neoprene latex.

2. The two-component aqueous neoprene adhesive of claim 1, wherein: the low molecular weight polyamide curing agent is any one of a polyamide curing agent 650 and a polyamide curing agent 651.

3. The two-component aqueous neoprene adhesive of claim 1, wherein: the mass ratio of the acetaminoacrylic acid to the toluene to the sodium hydroxide aqueous solution is 10-30:150-200:10-30.

4. The two-component aqueous neoprene according to claim 1 wherein: the mass ratio of the sodium acetaminoacrylate to the epichlorohydrin to the methanol to the benzyltrimethylammonium bromide is 10-30:20-40:150-200:0.1-0.5.

5. The two-component aqueous neoprene adhesive of claim 1, wherein: the mass ratio of the intermediate 1 to THF to the magnesium trifluoromethanesulfonate to aniline is 10-30:50-80:2-6:6-10.

6. The two-component aqueous neoprene adhesive of claim 1, wherein: the mass ratio of the neoprene latex to the cyclohexane to the mixed liquid a is 30-60:200-600:100-200.

7. The two-component aqueous neoprene according to claim 1 wherein: the mixed liquor a is prepared by mixing the intermediate 2 and benzoyl peroxide according to the mass ratio of 100-300:0.01-0.03 percent by weight.

8. The method for preparing the two-component water-based neoprene spraying adhesive according to any one of claims 1 to 7, comprising the steps of:

step 21, adding deionized water and KH-450 into a three-neck flask, and mechanically stirring for 0.5-1h at room temperature to obtain a mixed solution b;

step 22, adding the modified neoprene latex and the styrene-acrylic emulsion into a three-neck flask, mechanically stirring for 1-2 hours at room temperature, dropwise adding the mixed solution b, and mechanically stirring for 2-3 hours at room temperature after dropwise adding is finished to obtain a composite emulsion;

and step 23, adding the composite emulsion, the SD1688 aqueous antioxidant emulsion and the aqueous rosin resin 105 into a three-neck flask, mechanically stirring for 1-2h at room temperature, adding the low-molecular-weight polyamide curing agent, and continuously stirring for 1-2h at room temperature to obtain the bi-component aqueous neoprene adhesive.