Flocking glue and preparation method thereof

Abstract

The invention relates to the technical field of flocking adhesives, in particular to a flocking adhesive and a preparation method thereof.The flocking adhesive is at least prepared from, by weight, 15-35 parts of polyether polyol, 1-5 parts of hydroxy acrylic resin, 0.5-2.5 parts of chain extender, 20-70 parts of solvent, 0.1-1.0 part of dehydrating agent, 10-35 parts of curing agent, 0.1-1.0 part of initiator, 0.1-1.0 part of defoaming agent and 1.0-3.0 parts of catalyst. By optimizing a product formula system, the provided flocking glue can be directly used, a curing agent does not need to be additionally added in subsequent use, the drying speed is high, the firmness is excellent after drying, the ageing resistance is high, and the actual use requirements are better met.

Description

Technical Field

[0001] The invention relates to the technical field of flocking glue, in particular to a flocking glue and a preparation method thereof. Background Art

[0002] Flocking glue is a plastic adhesive, usually used for gluing materials such as fabrics, leather, and rubber. Flocking glue fixes plush fibers on the surface of fabrics to form plush fabrics. It has good adhesion and water resistance, can be stretched, and has good recovery performance. It is widely used in the fields of automobiles, construction, toys, etc. Traditional flocking glue dries slowly, or needs to be equipped with a curing agent when used. It is not firm enough after flocking, and will lose fluff after long-term use. It has poor aging resistance. For example, a Chinese patent (authorization announcement number is CN 109439263 B) discloses a method for preparing a spray-type water-based flocking glue, which mainly optimizes the formula system of components A and B so that the provided flocking glue can form a protective film on the surface of the glue layer after spraying, delays the volatilization of water, and prolongs the surface drying time of the flocking glue to 5 minutes or more, so that flocking can be successfully achieved. However, the convenience of use is insufficient, and the firmness and chemical resistance after flocking need to be further improved. Summary of the invention

[0003] In order to solve the above problems, the present invention provides a flocking glue. By optimizing the product formula system, the provided flocking glue can be used directly without the need to add additional curing agent in subsequent use. It has a fast drying speed and excellent firmness after drying, and strong aging resistance, which can better meet actual use needs.

[0004] On the one hand, the present invention provides a flocking glue, and its preparation raw materials include at least the following components, measured by weight: 15-35 parts of polyether polyol, 1-5 parts of hydroxy acrylic resin, 0.5-2.5 parts of chain extender, 20-70 parts of solvent, 0.1-1.0 parts of dehydrating agent, 10-35 parts of curing agent, 0.1-1.0 parts of initiator, 0.1-1.0 parts of defoaming agent, and 1.0-3.0 parts of catalyst.

[0005] As a preferred technical solution, the hydroxyl content of the polyether polyol is 0.5-1wt%, preferably 0.85±0.05wt%.

[0006] As a preferred technical solution, the viscosity of the polyether polyol at 25°C is 500-1500 mPa.s, preferably 980 mPa.s.

[0007] As a preferred technical solution, the model of the polyether polyol is Polyol 4200.

[0008] As a preferred technical solution, the hydroxyl value of the hydroxy acrylic resin is 100-150 mgKOH / g, preferably 123-133 mgKOH / g, and the model is ACRYDIC AU-7205 (DIC).

[0009] As a preferred technical solution, the chain extender is selected from at least one of an alcohol chain extender and an amine chain extender.

[0010] Preferably, the alcohol chain extender includes at least diol and triol.

[0011] Preferably, the diol is selected from at least one of 1,4-butanediol, ethylene glycol and diethylene glycol, preferably 1,4-butanediol.

[0012] Preferably, the triol is selected from at least one of glycerol and trimethylolpropane, preferably trimethylolpropane.

[0013] Preferably, the mass ratio of the diol to the triol is (0.1-1):(0.5-1.5).

[0014] As a preferred technical solution, the solvent is selected from at least one of hydrocarbon solvents, ether solvents, and lipid solvents, and is preferably xylene.

[0015] As a preferred technical solution, the mass ratio of the polyether polyol, the hydroxylated acrylic resin, and the solvent is (20-30):(2.5-3):(38-45), preferably (20-30):(2.5-3):42.5.

[0016] The invention adopts a polyether polyol with a hydroxyl content of 0.5-1wt% and a viscosity of 500-1500mPa.s at 25°C and a hydroxyl acrylic resin with a hydroxyl value of 100-150mgKOH / g, and controls the mass ratio of the polyether polyol, the hydroxyl acrylic resin and the solvent in the system to be (20-30): (2.5-3): (38-45). The product dries quickly and the firmness and chemical resistance after flocking are guaranteed. The product is easy to construct and the problems of a thick film layer and blistering on the film surface after construction are avoided.

[0017] As a preferred technical solution, the dehydrating agent is selected from at least one of isopropyl acetate, nanomolecular sieves, and p-toluenesulfonyl isocyanate, preferably p-toluenesulfonyl isocyanate.

[0018] As a preferred technical solution, the curing agent is isocyanate.

[0019] Preferably, the isocyanate is polymeric MDI, and the -NCO content of the polymeric MDI is 30.5-32.0 wt%.

[0020] Preferably, the model of the polymeric MDI is WANNATE PM-2025 or WANNATE PM-200.

[0021] As a preferred technical solution, the catalyst at least includes acetylacetone and dibutyltin dilaurate.

[0022] Preferably, the mass ratio of acetylacetone to dibutyltin dilaurate is (1-2):(0.1-0.5).

[0023] As a preferred technical solution, the mass ratio of the curing agent to the catalyst is (20-25):(1-3), preferably 25:(1.5-2).

[0024] Furthermore, the present invention uses polymerized MDI with an -NCO content of 30.5-32.0wt% as a curing agent, and further controls the mass ratio of the curing agent to the catalyst in the system to (20-25): (1-3), thereby avoiding the problem of slow drying speed due to excessive cross-linking reaction time, and further improving the flocking firmness and chemical resistance.

[0025] As a preferred technical solution, the defoaming agent at least includes modified polysiloxane.

[0026] Preferably, the modified polysiloxane is TEGO 843.

[0027] As a preferred technical solution, the initiator at least includes an organic peroxide.

[0028] Preferably, the organic peroxide is tert-butyl perbenzoate.

[0029] As a preferred technical solution, the raw materials for preparing the flocking glue further include 0.1-1 parts of color paste, preferably 0.5-0.7 parts, by weight.

[0030] Preferably, the color paste is a solvent-based color paste, including one or a mixture of carbon black paste, iron red paste, scarlet paste, iron yellow paste, titanium white paste, and ultramarine blue paste.

[0031] Another aspect of the present invention provides a method for preparing flocking glue, which comprises at least the following steps:

[0032] (1) adding polyether polyol, hydroxy acrylic resin, chain extender, and 40-60 wt % solvent into a container and stirring and mixing to obtain a mixture;

[0033] (2) adding a dehydrating agent to the mixed material, stirring and dispersing the mixed material to obtain a dehydrated material;

[0034] (3) adding a curing agent to the dehydrated material, stirring and dispersing the mixture to obtain a prepolymer;

[0035] (4) Add initiator, residual solvent, defoamer and catalyst to the prepolymer, stir and disperse, and then obtain flocking glue.

[0036] As a preferred technical solution, the stirring and mixing conditions in step (1) include: after evacuating the container, nitrogen is filled into the container until the pressure in the container is -0.05-0.05 MPa, the temperature is 60-70°C, the rotation speed is 400-600 rpm, and the time is 10-60 min.

[0037] As a preferred technical solution, the stirring and dispersing conditions in step (2) include: after evacuating the container, nitrogen is filled into the container until the pressure is -0.05-0.05MPa, the temperature is 45-55°C, the rotation speed is 400-600rpm, and the time is 10-30min.

[0038] As a preferred technical solution, the stirring and dispersing conditions in step (3) include: after evacuating the container, nitrogen is filled into the container until the pressure is -0.05-0.05MPa, the temperature is 75-90°C, the rotation speed is 400-600rpm, and the time is 1-3h.

[0039] As a preferred technical solution, the stirring and dispersing conditions in step (4) include: after vacuuming, nitrogen is filled into the container until the pressure in the container is -0.05-0.05MPa, the temperature is 40-60°C, the rotation speed is 400-600rpm, and the time is 10-30min.

[0040] As a preferred technical solution, the moisture content of the dehydrated material is less than 500 ppm.

[0041] As a preferred technical solution, the -NCO content in the prepolymer is 3.0-5.0wt%, preferably 4.0wt%.

[0042] In addition, based on the selection of various raw materials in the system, the present invention optimizes the preparation process, especially controls the -NCO content in the prepolymer to be 3.0-5.0wt%, so that the provided flocking adhesive has a suitable drying speed and excellent chemical resistance and fastness.

[0043] Beneficial Effects

[0044] 1. The present invention provides a flocking glue, which can be used directly by optimizing the product formula system, and does not require the addition of an additional curing agent in subsequent use. It has a fast drying speed and excellent firmness after drying, and has strong aging resistance, so as to better meet actual use requirements.

[0045] 2. The present invention adopts a polyether polyol with a hydroxyl content of 0.5-1wt% and a viscosity of 500-1500mPa.s at 25°C and a hydroxyl acrylic resin with a hydroxyl value of 100-150mgKOH / g, and controls the mass ratio of the polyether polyol, the hydroxyl acrylic resin, and the solvent in the system to be (20-30): (2.5-3): (38-45). The product dries quickly, while ensuring the firmness and chemical resistance after flocking. The product is easy to construct, avoiding the problem of a thick film layer and blistering on the film surface after construction.

[0046] 3. The present invention adopts polymerized MDI with an -NCO content of 30.5-32.0wt% as a curing agent, and further controls the mass ratio of the curing agent and the catalyst in the system to (20-25): (1-3), thereby avoiding the problem of slow drying speed caused by excessive cross-linking reaction time, and further improving the flocking firmness and chemical resistance.

[0047] 4. Based on the selection of various raw materials in the system, the present invention optimizes the preparation process, especially controls the -NCO content in the prepolymer to be 3.0-5.0wt%, so that the provided flocking glue has a suitable drying speed and excellent chemical resistance and fastness.

[0048] 5. The flocking glue provided by the present invention has easy-to-obtain raw materials, a simple preparation process, and convenient construction. It can be widely used in the fields of automobiles, construction, toys, etc., and has extremely high market application and promotion value. DETAILED DESCRIPTION

[0049] Example 1

[0050] Embodiment 1 of the present invention provides a flocking glue, and its preparation raw materials include the following components, by weight: 25 parts of polyether polyol, 2.5 parts of hydroxy acrylic resin, 1.5 parts of chain extender, 42.5 parts of solvent, 0.5 parts of dehydrating agent, 25 parts of curing agent, 0.5 parts of initiator, 0.1 parts of defoaming agent, 1.7 parts of catalyst, and 0.7 parts of color paste.

[0051] The hydroxyl content of the polyether polyol is 0.85±0.05wt%, the viscosity of the polyether polyol at 25°C is 980mPa.s, and the model is Polyol 4200 (Covestro).

[0052] The hydroxyl value of the hydroxy acrylic resin is 123-133 mgKOH / g, and the model is ACRYDIC AU-7205 (DIC).

[0053] The chain extender is an alcohol chain extender, which is a combination of a diol and a triol, wherein the diol is 1,4-butanediol, the triol is trimethylolpropane, and the mass ratio of the diol to the triol is 0.5:1.

[0054] The solvent is xylene.

[0055] The dehydrating agent is p-toluenesulfonyl isocyanate.

[0056] The curing agent is isocyanate, the isocyanate is polymeric MDI, the -NCO content of the polymeric MDI is 30.5-32.0 wt %, and the model of the polymeric MDI is WANNATE PM-2025 (Wanhua).

[0057] The catalyst is a combination of acetylacetone and dibutyltin dilaurate, and the mass ratio of the acetylacetone to dibutyltin dilaurate is 1.5:0.2.

[0058] The defoaming agent is modified polysiloxane, and the modified polysiloxane is TEGO 843.

[0059] The initiator is an organic peroxide, and the organic peroxide is tert-butyl perbenzoate.

[0060] The color paste is U4334 iron yellow paste produced by Shanghai Xiyan Industrial.

[0061] Embodiment 1 of the present invention provides a method for preparing flocking glue, comprising the following steps:

[0062] (1) adding polyether polyol, hydroxy acrylic resin, chain extender, and 54 wt % solvent into a container and stirring and mixing to obtain a mixture;

[0063] (2) adding a dehydrating agent to the mixed material, stirring and dispersing the mixed material to obtain a dehydrated material;

[0064] (3) adding a curing agent to the dehydrated material, stirring and dispersing the mixture to obtain a prepolymer;

[0065] (4) Add initiator, residual solvent, defoamer and catalyst to the prepolymer, stir and disperse, and then obtain flocking glue.

[0066] The stirring and mixing conditions in step (1) include: vacuumizing and then filling the container with nitrogen until the pressure in the container is 0±0.05 MPa, the temperature is 65° C., the rotation speed is 500 rpm, and the time is 30 min.

[0067] The stirring and dispersing conditions in step (2) include: vacuumizing and then filling the container with nitrogen until the pressure in the container is 0±0.05 MPa, the temperature is 50° C., the rotation speed is 500 rpm, and the time is 20 min.

[0068] The stirring and dispersing conditions in step (3) include: vacuumizing and then filling the container with nitrogen until the pressure in the container is 0±0.05 MPa, the temperature is 80° C., the rotation speed is 500 rpm, and the time is 2 hours.

[0069] The stirring and dispersing conditions in step (4) include: after evacuating the container, nitrogen is filled in until the pressure in the container is 0±0.05 MPa, the temperature is 50° C., the rotation speed is 500 rpm, and the time is 20 min.

[0070] The moisture content of the dehydrated material is 300±100 ppm.

[0071] The -NCO content in the prepolymer is 4.0 wt %.

[0072] Example 2

[0073] Example 2 of the present invention provides a flocking glue and a preparation method thereof. Its specific implementation method is the same as that of Example 1, except that, calculated by weight, the preparation raw materials include the following components: 25 parts of polyether polyol, 2.5 parts of hydroxy acrylic resin, 1.5 parts of chain extender, 36 parts of solvent, 0.5 parts of dehydrating agent, 25 parts of curing agent, 0.5 parts of initiator, 0.1 parts of defoaming agent, and 1.7 parts of catalyst.

[0074] The preparation method of the flocking glue comprises the following steps:

[0075] (1) adding polyether polyol, hydroxy acrylic resin, chain extender, and 43 wt % solvent into a container and stirring and mixing to obtain a mixture;

[0076] (2) adding a dehydrating agent to the mixed material, stirring and dispersing the mixed material to obtain a dehydrated material;

[0077] (3) adding a curing agent to the dehydrated material, stirring and dispersing the mixture to obtain a prepolymer;

[0078] (4) Add initiator, residual solvent, defoamer and catalyst to the prepolymer, stir and disperse, and then obtain flocking glue.

[0079] Example 3

[0080] Example 3 of the present invention provides a flocking glue and a preparation method thereof. Its specific implementation method is the same as that of Example 1, except that, in parts by weight, its preparation raw materials include the following components: 25 parts of polyether polyol, 2.5 parts of hydroxy acrylic resin, 1.5 parts of chain extender, 42.5 parts of solvent, 0.5 parts of dehydrating agent, 28 parts of curing agent, 0.5 parts of initiator, 0.1 parts of defoaming agent, and 1.7 parts of catalyst.

[0081] Example 4

[0082] Example 4 of the present invention provides a flocking glue and a preparation method thereof, and its specific implementation method is the same as that of Example 1, except that, measured by weight, its preparation raw materials include the following components: 25 parts of polyether polyol, 2.5 parts of hydroxy acrylic resin, 1.5 parts of chain extender, 42.5 parts of solvent, 0.5 parts of dehydrating agent, 28 parts of curing agent, 0.5 parts of initiator, 0.1 parts of defoaming agent, and 1.6 parts of catalyst, wherein the catalyst is a combination of acetylacetone and dibutyltin dilaurate, and the mass ratio of acetylacetone to dibutyltin dilaurate is 1.5:0.1.

[0083] Example 5

[0084] Example 5 of the present invention provides a flocking glue and a preparation method thereof. Its specific implementation method is the same as that of Example 1, except that, in parts by weight, its preparation raw materials include the following components: 25 parts of polyether polyol, 2.0 parts of hydroxy acrylic resin, 1.5 parts of chain extender, 42.5 parts of solvent, 0.5 parts of dehydrating agent, 25 parts of curing agent, 0.5 parts of initiator, 0.1 parts of defoaming agent, and 1.7 parts of catalyst.

[0085] Example 6

[0086] Example 6 of the present invention provides a flocking adhesive and a preparation method thereof, and its specific implementation manner is the same as that of Example 1, except that the -NCO content in the prepolymer is 5.5 wt%.

[0087] Example 7

[0088] Example 7 of the present invention provides a flocking glue and a preparation method thereof, and its specific implementation manner is the same as that of Example 1, except that the polyether polyol is replaced by Desmophen 1652 (Covestro).

[0089] Example 8

[0090] Example 8 of the present invention provides a flocking glue and a preparation method thereof, and its specific implementation method is the same as that of Example 1, except that the polymeric MDI is replaced by modified MDI, Wannate PM8223 (Wanhua).

[0091] Example 9

[0092] Example 9 of the present invention provides a flocking adhesive and a preparation method thereof, and its specific implementation method is the same as that of Example 1, except that the polymeric MDI is replaced by MDI, MDI-50 (Wanhua).

[0093] Performance Testing

[0094] The flocking adhesives provided in Examples 1-9 were subjected to the following performance tests, and the test results are shown in Table 1.

[0095] 1. Drying speed: The substrate (EPDM, ethylene propylene diene monomer rubber) is coated with glue (the flocking glue provided in Examples 1-9) and then flocked. The substrate enters a baking tunnel with a temperature set at 180°C (the flocking surface temperature is 160°C) and a line speed of 15 m / min for testing. The substrate is taken out after baking and placed at 25°C for 60 seconds. The time it takes for the surface of the film to become non-sticky when a clean and dry finger is pressed on it is recorded as the drying speed.

[0096] 2. Firmness (wear resistance test): Volkswagen PV3366.

[0097] 3. Chemical resistance (alcohol resistance test): GB / T 23989-2009.

[0098] Table 1

[0099]

[0100]

Claims

1. A flocking glue, characterized in that: The raw materials for its preparation include at least the following components by weight: 15-35 parts of polyether polyol, 1-5 parts of hydroxy acrylic resin, 0.5-2.5 parts of chain extender, 20-70 parts of solvent, 0.1-1.0 parts of dehydrating agent, 10-35 parts of curing agent, 0.1-1.0 parts of initiator, 0.1-1.0 parts of defoaming agent and 1.0-3.0 parts of catalyst.

2. The flocking glue according to claim 1, characterized in that: The hydroxyl content of the polyether polyol is 0.5-1wt%, and the viscosity of the polyether polyol at 25°C is 500-1500mPa.s.

3. The flocking glue according to claim 2, characterized in that: The hydroxy value of the hydroxy acrylic resin is 100-150 mgKOH / g.

4. The flocking glue according to claim 3, characterized in that: The chain extender is selected from at least one of an alcohol chain extender and an amine chain extender.

5. The flocking adhesive according to claim 4, characterized in that: The solvent is selected from at least one of hydrocarbon solvents, ether solvents and lipid solvents.

6. The flocking glue according to claim 5, characterized in that: The mass ratio of the polyether polyol, the hydroxy acrylic resin and the solvent is (20-30): (2.5-3): (38-45).

7. The flocking adhesive according to claim 6, characterized in that: The dehydrating agent is selected from at least one of isopropyl acetate, nano molecular sieves, and p-toluenesulfonyl isocyanate.

8. The flocking adhesive according to claim 7, characterized in that: The mass ratio of the curing agent to the catalyst is (20-25):(1-3).

9. A method for preparing flocking glue according to any one of claims 1 to 8, characterized in that: At least the following steps are included: (1) adding polyether polyol, hydroxy acrylic resin, chain extender, and 40-60 wt % solvent into a container and stirring and mixing to obtain a mixture; (2) adding a dehydrating agent to the mixed material, stirring and dispersing the mixed material to obtain a dehydrated material; (3) adding a curing agent to the dehydrated material, stirring and dispersing the mixture to obtain a prepolymer; (4) Add initiator, residual solvent, defoamer and catalyst to the prepolymer, stir and disperse, and then obtain flocking glue.

10. The method for preparing flocking glue according to claim 9, characterized in that: The -NCO content in the prepolymer is 3.0-5.0 wt %.

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