Environmentally friendly odorless two-component polyurethane bathtub glue and preparation method thereof

Abstract

The invention discloses an environmentally friendly odorless two-component polyurethane bathtub glue and a preparation method, specifically related to the field of bathroom, including component A and component B, component A includes by weight: 10-20 parts of castor oil polyol, 40-60 parts of polyol, 5-8 parts of tetrahydroxyethylenediamine, 6.5-10.5 parts of silicon dioxide, 10-14 parts of molecular sieves, 0.3-0.7 parts of isocyanate / hydroxyl reaction catalyst and 1-3 parts of defoamer, component B includes by weight: multifunctional isocyanate compound. The present invention is easy to operate and easy to construct, has high strength, can absorb large impact load, and is helpful to improve the stability of acrylic bathtub structure; and the two-component polyurethane bathtub glue has good flame retardant effect, and can prevent some safety accidents caused by fire to a limited extent; at the same time, it has strong pressure resistance and good adhesion; and the glass transition temperature TG point is high, and the acrylic bathtub is not deformed when it is bubbled at 75°C.

Description

Technical Field

[0001] The invention belongs to the field of sanitary ware, and particularly relates to a preparation method and application of a two-component polyurethane bathtub glue used in acrylic bathtubs instead of unsaturated polyester. Background Art

[0002] In the current bathroom market, acrylic materials are widely used. Acrylic is PMMA, which is polymethyl methacrylate. The acrylic bathtub bodies on the market are basically sprayed with a layer of unsaturated polyester and glass fiber on the outside after the bathtub is prefabricated for reinforcement and fixation.

[0003] For example, Chinese patent CN107722885A discloses an acrylic bathtub joint adhesive and its application, using PMMA and MMA as the main components of the adhesive resin, improving the fusion of the adhesive resin and the acrylic material, while adding epoxy acrylic acid to accelerate the bonding speed and adhesion of the adhesive resin and the material. This method will cause certain air pollution during the construction process because of the strong monomer odor, and it also requires glass fiber reinforcement.

[0004] Polyurethane adhesives are usually prepared by using isocyanates and polyethers, polyesters or other polyols containing hydroxyl groups. The prepared polyurethane adhesives contain carbamate groups (-NHCOO-) or isocyanate groups (-NCO) in the molecular chain. Polyurethane adhesives have a wide range of applications and are suitable for bonding most substrates. They are one of the important varieties of synthetic adhesives. Polyurethane adhesives can be divided into two types according to the method of use: one-component adhesives and two-component adhesives. Two-component polyurethane adhesives are not only easy to store, but also easy to apply, and the operating time is easy to adjust. At the same time, the construction is odorless and pollution-free, with high mechanical strength and no need for glass fiber reinforcement. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the embodiments of the present invention provide an environmentally friendly odorless two-component polyurethane bathtub glue and a preparation method thereof. The technical problem to be solved by the present invention is: how to prepare an environmentally friendly odorless two-component polyurethane bathtub glue.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an environmentally friendly and odorless two-component polyurethane bathtub glue, comprising component A and component B, component A comprising, by weight: 10-20 parts of castor oil polyol, 40-60 parts of polyol, 5-8 parts of tetrahydroxyethylenediamine, 6.5-10.5 parts of silicon dioxide, 10-14 parts of molecular sieves, 0.3-0.7 parts of isocyanate / hydroxyl reaction catalyst and 1-3 parts of defoaming agent, and component B comprising, by weight: 100 parts of multifunctional isocyanate compound.

[0007] Preferably, the polyol in component A includes: one of polyether polyol, aromatic polyol, polyester polyol and polycarbonate polyol.

[0008] Preferably, the isocyanate / hydroxyl reaction catalyst in component A includes one or more of pentamethyldiethylenetriamine, trimethylaminoethylethanolamine, diethylethanolamine, triethylamine, N-methylmorpholine, dimethylethanolamine and dimethylaminoethoxyethanol.

[0009] Preferably, the multifunctional isocyanate compound in component B includes one of HDI, IPDI, crude MDI and HDI trimer.

[0010] Preferably, component A comprises, by weight: 12 parts of castor oil polyol, 60 parts of polyester polyol, 8 parts of tetrahydroxyethylenediamine, 6.5 parts of silica, 10 parts of molecular sieves, 0.3 parts of isocyanate / hydroxyl reaction catalyst and 1 part of defoamer, and the multifunctional isocyanate compound is 100 parts of crude MDI.

[0011] Preferably, component A comprises, by weight: 12 parts of castor oil polyol, 60 parts of polyether polyol, 8 parts of tetrahydroxyethylenediamine, 6.5 parts of silica, 10 parts of molecular sieves, 0.3 parts of isocyanate / hydroxyl reaction catalyst and 1 part of defoamer, and the multifunctional isocyanate compound is 100 parts of HDI.

[0012] Preferably, component A comprises, by weight: 14 parts of castor oil polyol, 55 parts of aromatic polyol, 7 parts of tetrahydroxyethylenediamine, 6.5 parts of silica, 10 parts of molecular sieves, 0.3 parts of isocyanate / hydroxyl reaction catalyst and 1 part of defoamer, and the multifunctional isocyanate compound is 100 parts of IPDI.

[0013] Preferably, component A comprises, by weight: 16 parts of castor oil polyol, 50 parts of polyester polyol, 6 parts of tetrahydroxyethylenediamine, 6.5 parts of silica, 10 parts of molecular sieves, 0.3 parts of isocyanate / hydroxyl reaction catalyst and 1 part of defoamer, and the multifunctional isocyanate compound is 100 parts of crude MDI.

[0014] Preferably, component A comprises, by weight: 18 parts of castor oil polyol, 40 parts of polycarbonate polyol, 5 parts of tetrahydroxyethylenediamine, 6.5 parts of silica, 10 parts of molecular sieves, 0.3 parts of isocyanate / hydroxyl reaction catalyst and 1 part of defoamer, and the multifunctional isocyanate compound is 100 parts of HDI trimer.

[0015] The present invention also provides a method for preparing an environmentally friendly and odorless two-component polyurethane bathtub adhesive, which is characterized by comprising the following steps:

[0016] S1: At room temperature, castor oil, polyester polyol, tetrahydroxyethylenediamine, gas silicon, molecular sieve, catalyst and defoamer are evacuated and stirred for 0.5 h until uniform to obtain component A, and a multifunctional isocyanate compound is taken as component B;

[0017] S2: at room temperature, the component A and component B obtained in S1 are respectively put into a two-component tube to obtain a finished polyurethane bathtub glue;

[0018] S3: At room temperature, use a glue gun to evenly spray the finished polyurethane bathtub glue obtained in S2 on the back of the acrylic bathtub, dry and cure at room temperature for 2 hours to obtain an acrylic bathtub sample;

[0019] S4: Perform performance tests on the acrylic bathtub samples obtained in S3. The performance test items include compression strength, operation time, odor, hardness, pressure resistance and boiling water resistance.

[0020] The present invention provides an environmentally friendly and odorless two-component polyurethane bathtub glue and a preparation method thereof. Compared with the prior art, it has the following beneficial effects:

[0021] (1) The environmentally friendly and odorless two-component polyurethane bathtub glue is easy to operate and construct, has high strength, can absorb large impact loads, and helps to improve the stability of the acrylic bathtub structure; and the two-component polyurethane bathtub glue has a good flame retardant effect, effectively preventing some safety accidents caused by fire; at the same time, it has strong pressure resistance and good adhesion; and the glass transition temperature TG point is high, and the acrylic bathtub will not deform when soaked in 75°C water.

[0022] (2) The environmentally friendly and odorless two-component polyurethane bathtub glue does not require any volatile solvent to be added during the preparation process, and is environmentally friendly and pollution-free.

[0023] (3) The environmentally friendly and odorless two-component polyurethane bathtub glue can be sprayed with a two-component glue gun at room temperature. It is simple to prepare and convenient and quick to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention is a flow chart for preparing the environmentally friendly and odorless two-component polyurethane bathtub adhesive. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The present invention is further described in conjunction with specific embodiments. The raw materials involved in the following embodiments can be obtained from commercial channels.

[0027] Example 1

[0028] like Figure 1 As shown, the present invention provides an environmentally friendly and odorless two-component polyurethane bathtub glue, comprising component A and component B, component A comprises, by weight: 10-20 parts of castor oil polyol, 40-60 parts of polyol, 5-8 parts of tetrahydroxyethylenediamine, 6.5-10.5 parts of silicon dioxide, 10-14 parts of molecular sieves, 0.3-0.7 parts of isocyanate / hydroxyl reaction catalyst and 1-3 parts of defoaming agent, and component B comprises, by weight: 100 parts of multifunctional isocyanate compound.

[0029] The polyol in component A includes one of polyether polyol, aromatic polyol, polyester polyol and polycarbonate polyol.

[0030] The isocyanate / hydroxyl reaction catalyst in component A includes one or more of pentamethyldiethylenetriamine, trimethylaminoethylethanolamine, diethylethanolamine, triethylamine, N-methylmorpholine, dimethylethanolamine and dimethylaminoethoxyethanol.

[0031] The multifunctional isocyanate compound in component B includes one of HDI, IPDI, crude MDI and HDI trimer.

[0032] Component A comprises, by weight: 12 parts of castor oil polyol, 60 parts of polyester polyol, 8 parts of tetrahydroxyethylenediamine, 6.5 parts of silicon dioxide, 10 parts of molecular sieves, 0.3 parts of isocyanate / hydroxyl reaction catalyst and 1 part of defoamer, and the multifunctional isocyanate compound is 100 parts of crude MDI.

[0033] The present invention also provides a method for preparing an environmentally friendly and odorless two-component polyurethane bathtub adhesive, which is characterized by comprising the following steps:

[0034] S1: At room temperature, castor oil, polyester polyol, tetrahydroxyethylenediamine, gas silicon, molecular sieve, catalyst and defoamer are evacuated and stirred for 0.5 h until uniform to obtain component A, and a multifunctional isocyanate compound is taken as component B;

[0035] S2: at room temperature, the component A and component B obtained in S1 are respectively put into a two-component tube to obtain a finished polyurethane bathtub glue;

[0036] S3: At room temperature, use a glue gun to evenly spray the finished polyurethane bathtub glue obtained in S2 on the back of the acrylic bathtub, dry and cure at room temperature for 2 hours to obtain an acrylic bathtub sample.

[0037] S4: Perform performance tests on the acrylic bathtub samples obtained in S3. The performance test items include compression strength, operation time, odor, hardness, pressure resistance and boiling water resistance.

[0038] Example 2

[0039] Different from Example 1, component A includes, by weight: 12 parts of castor oil polyol, 60 parts of polyether polyol, 8 parts of tetrahydroxyethylenediamine, 6.5 parts of silica, 10 parts of molecular sieves, 0.3 parts of isocyanate / hydroxyl reaction catalyst and 1 part of defoaming agent, and the multifunctional isocyanate compound is 100 parts of HDI.

[0040] Example 3

[0041] Different from Example 1, component A includes, by weight, 14 parts of castor oil polyol, 55 parts of aromatic polyol, 7 parts of tetrahydroxyethylenediamine, 6.5 parts of silica, 10 parts of molecular sieves, 0.3 parts of isocyanate / hydroxyl reaction catalyst and 1 part of defoaming agent, and the multifunctional isocyanate compound is 100 parts of IPDI.

[0042] Example 4

[0043] Different from Example 1, component A includes, by weight: 16 parts of castor oil polyol, 50 parts of polyester polyol, 6 parts of tetrahydroxyethylenediamine, 6.5 parts of silica, 10 parts of molecular sieves, 0.3 parts of isocyanate / hydroxyl reaction catalyst and 1 part of defoaming agent, and the multifunctional isocyanate compound is 100 parts of crude MDI.

[0044] Example 5

[0045] Different from Example 1, component A includes, by weight, 18 parts of castor oil polyol, 40 parts of polycarbonate polyol, 5 parts of tetrahydroxyethylenediamine, 6.5 parts of silica, 10 parts of molecular sieves, 0.3 parts of isocyanate / hydroxyl reaction catalyst and 1 part of defoamer, and the multifunctional isocyanate compound is 100 parts of HDI trimer.

[0046] The contents of the components of the finished polyurethane bathtub adhesives of Examples 1-5 are shown in the following table:

[0047]

[0048]

[0049] The gluing and gluing processes of Examples 1-5 are the same, with a volume ratio of component A to component B of 1:1. At room temperature, component A and component B are loaded into a two-component tube to form an environmentally friendly, odorless two-component polyurethane bathtub glue, which is then evenly sprayed directly onto the back of the bathtub using a glue gun.

[0050] The performance tests of the acrylic bathtub samples obtained in Examples 1-5 were performed, and the test results are shown in the following table:

[0051]

[0052] The compression performance test uses a universal testing machine and is measured in accordance with the GB / T8813-2008 standard for the determination of compression performance of rigid foam plastics; the odor is measured according to the QC / T1024-2015≤One-component polyurethane sealant for automobiles≥ standard; the operating time is measured according to the GB / T 7123.1-2015≤Determination of the operable time of multi-component adhesives≥ standard; the hardness is measured according to the GB / T 2411-2008 standard "Determination of indentation hardness (Shore hardness) of plastics and hard rubber using a hardness tester"; the pressure resistance test is that after the two-component polyurethane bathtub glue is completely sprayed and cured, the bathtub is turned over and a load of 100kg is placed on the back of the bathtub, and the deformation of the bathtub is used as the test standard; the water boiling resistance test is that after the two-component polyurethane bathtub glue is completely sprayed and cured, it is boiled in 75℃ water for 72 hours, and the deformation of the bathtub is used as the test standard.

[0053] Combined with the test results of the two-component polyurethane bathtub glue of Examples 1-5, the environmentally friendly and odorless two-component polyurethane bathtub glue of the present invention not only has excellent pressure resistance and water boiling resistance, but also has high bonding strength, is easy to operate and construct, and has no odor. Compared with the traditional method of making the surface material polymethyl methacrylate and then reinforcing it with glass fiber, it not only overcomes the shortcomings of strong construction odor and pollution, but also the construction of the two-component polyurethane bathtub glue is more convenient and quick, and also has excellent bonding performance and pressure resistance and water boiling resistance.

[0054] Finally, a few points should be explained: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, which may refer to mechanical connection or electrical connection, or internal communication between two components, or direct connection. "upper", "lower", "left", "right", etc. are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may change;

[0055] Secondly: In the drawings of the embodiments disclosed in the present invention, only the structures related to the embodiments disclosed in the present invention are involved, and other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other;

[0056] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An environmentally friendly, odorless two-component polyurethane bathtub adhesive, comprising component A and component B, characterized in that: The component A comprises, by weight: 10-20 parts of castor oil polyol, 40-60 parts of polyol, 5-8 parts of tetrahydroxyethylenediamine, 6.5-10.5 parts of silicon dioxide, 10-14 parts of molecular sieves, 0.3-0.7 parts of isocyanate / hydroxyl reaction catalyst and 1-3 parts of defoamer, and the component B comprises, by weight: 100 parts of multifunctional isocyanate compound; The polyol in component A includes: one of polyether polyol, aromatic polyol, polyester polyol and polycarbonate polyol; The multifunctional isocyanate compound in the component B includes one of HDI, IPDI, crude MDI and HDI trimer.

2. The environmentally friendly odorless two-component polyurethane bathtub glue according to claim 1, characterized in that: The isocyanate / hydroxyl reaction catalyst in the component A includes one or more of pentamethyldiethylenetriamine, trimethylaminoethylethanolamine, diethylethanolamine, triethylamine, N-methylmorpholine, dimethylethanolamine and dimethylaminoethoxyethanol.

3. The environmentally friendly odorless two-component polyurethane bathtub glue according to claim 1, characterized in that: The component A comprises, by weight, 12 parts of castor oil polyol, 60 parts of polyester polyol, 8 parts of tetrahydroxyethylenediamine, 6.5 parts of silicon dioxide, 10 parts of molecular sieves, 0.3 parts of isocyanate / hydroxyl reaction catalyst and 1 part of defoamer, and the multifunctional isocyanate compound is 100 parts of crude MDI.

4. The environmentally friendly odorless two-component polyurethane bathtub glue according to claim 1, characterized in that: The component A comprises, by weight: 12 parts of castor oil polyol, 60 parts of polyether polyol, 8 parts of tetrahydroxyethylenediamine, 6.5 parts of silicon dioxide, 10 parts of molecular sieves, 0.3 parts of isocyanate / hydroxyl reaction catalyst and 1 part of defoamer, and the multifunctional isocyanate compound is 100 parts of HDI.

5. The environmentally friendly odorless two-component polyurethane bathtub glue according to claim 1, characterized in that: The component A comprises, by weight: 14 parts of castor oil polyol, 55 parts of aromatic polyol, 7 parts of tetrahydroxyethylenediamine, 6.5 parts of silicon dioxide, 10 parts of molecular sieves, 0.3 parts of isocyanate / hydroxyl reaction catalyst and 1 part of defoaming agent, and the multifunctional isocyanate compound is 100 parts of IPDI.

6. The environmentally friendly odorless two-component polyurethane bathtub glue according to claim 1, characterized in that: The component A comprises, by weight: 16 parts of castor oil polyol, 50 parts of polyester polyol, 6 parts of tetrahydroxyethylenediamine, 6.5 parts of silicon dioxide, 10 parts of molecular sieves, 0.3 parts of isocyanate / hydroxyl reaction catalyst and 1 part of defoamer, and the multifunctional isocyanate compound is 100 parts of crude MDI.

7. The environmentally friendly odorless two-component polyurethane bathtub glue according to claim 1, characterized in that: The component A comprises, by weight: 18 parts of castor oil polyol, 40 parts of polycarbonate polyol, 5 parts of tetrahydroxyethylenediamine, 6.5 parts of silicon dioxide, 10 parts of molecular sieves, 0.3 parts of isocyanate / hydroxyl reaction catalyst and 1 part of defoamer, and the multifunctional isocyanate compound is 100 parts of HDI trimer.

8. A method for preparing the environmentally friendly odorless two-component polyurethane bathtub glue according to any one of claims 1 to 7, characterized in that: The specific steps include the following: S1: At room temperature, castor oil, polyol, tetrahydroxyethylenediamine, gas silicon, molecular sieve, catalyst and defoamer are evacuated and stirred for 0.5 h until uniform to obtain component A, and a multifunctional isocyanate compound is taken as component B; S2: at room temperature, the component A and component B obtained in S1 are respectively put into a two-component tube to obtain a finished polyurethane bathtub glue; S3: At room temperature, use a glue gun to evenly spray the finished polyurethane bathtub glue obtained in S2 on the back of the acrylic bathtub, dry and cure at room temperature for 2 hours to obtain an acrylic bathtub sample; S4: Perform performance tests on the acrylic bathtub samples obtained in S3. The performance test items include compression strength, operation time, odor, hardness, pressure resistance and boiling water resistance.

Images