Two-component sealant and preparation method thereof

Abstract

The invention relates to the technical field of building sealing materials, in particular to a two-component sealant and a preparation method thereof, and the two-component sealant is prepared from a component A and a component B, the component A is prepared from the following raw materials: epoxy resin, a first defoaming agent, a diluent and a first filler; and the component B is prepared from the following raw materials: a curing agent, a second defoaming agent, a flow stopping agent, a second filler and a UV (Ultraviolet) auxiliary agent. The double-component seam beautifying agent provided by the invention can prevent the phenomenon of caking, and has excellent yellow edge resistance, mechanical property and storage stability.

Description

Technical Field

[0001] The invention relates to the technical field of building sealing materials, and in particular to a two-component seam beautifying agent and a preparation method thereof. Background Art

[0002] Caulking agent is a kind of building sealing material specially used to fill the gaps between floor and wall tiles and ceramic materials. As an upgraded product of caulking agent, epoxy caulking agent is mainly composed of epoxy resin, curing agent and a variety of additives. It has better anti-seepage, anti-freeze, salt resistance, alkali resistance and weak acid corrosion resistance. Although these types of caulking agents have their own unique advantages and applicability, epoxy caulking materials on the market currently generally face some problems. For example, their curing speed is too fast, resulting in limited operating time and flexibility during construction; at the same time, many epoxy caulking agents have poor yellowing and oxidation resistance, and are prone to discoloration during long-term use. In addition, their bonding strength and flexibility are low, which affects the use effect and lifespan.

[0003] Chinese patent CN118834643A discloses an environmentally friendly water-based epoxy caulking agent that resists shrinkage cracking and a preparation method thereof. The thermal effect of the reaction between N-aminoethylpiperazine and epoxy resin is used to make the water-based epoxy caulking agent composition have very good wettability and permeability to the base material of building materials, excellent adhesion, and extremely low shrinkage. Patent CN111410890A discloses a two-component anti-cracking caulking agent and a preparation method thereof. Polyamide-modified nano titanium dioxide is used. Under the joint action of coupling agent, emulsifier, and pH regulator, the caulking agent is not easy to crack. However, the yellowing resistance and storage stability of the caulking agent in the above-mentioned prior art still need to be improved. Summary of the invention

[0004] In order to solve the problems in the prior art, the first aspect of the present invention provides a two-component seam beautifying agent, the preparation raw materials including: component A and component B; the preparation raw materials of component A include epoxy resin, a first defoamer, a diluent, and a first filler; the preparation raw materials of component B include a curing agent, a second defoamer, a stopper, a second filler, and a UV additive.

[0005] In one embodiment, the two-component seam beautifying agent, in terms of weight percentage, the raw materials for preparing component A include: 75-95 parts of epoxy resin, 0-1 parts of a first defoaming agent, 2-6 parts of a diluent, and 4-8 parts of a first filler; the raw materials for preparing component B include: 70-90 parts of a curing agent, 0-1 parts of a second defoaming agent, 1-2 parts of a flow stopper, 4-8 parts of a second filler, and 0.5-2 parts of a UV additive.

[0006] In a preferred embodiment, the raw materials for preparing the B component further include 1-5 parts of pigment.

[0007] In one embodiment, the mass ratio of component A to component B is 1:(0.9-1).

[0008] In a preferred embodiment, the mass ratio of component A to component B is 1:1.

[0009] In one embodiment, the mass ratio of the epoxy resin to the curing agent is (80-90): (85-90).

[0010] In a preferred embodiment, the mass ratio of the epoxy resin to the curing agent is 89.7:88.3.

[0011] The epoxy resin is hydrogenated, mainly to convert its internal unsaturated parts (such as benzene rings) into saturated structures. This process is achieved by hydrogenating unsaturated groups. The purpose of this is to eliminate the adverse effects of unsaturated chromophores, thereby enhancing the material's resistance to ultraviolet rays, anti-aging properties, etc., to ensure that the epoxy resin is not prone to discoloration or yellowing due to aging. The applicant found in actual research and development that when hydrogenated epoxy resin is used in the system, although its yellowing resistance can be improved, it is difficult to take into account its mechanical properties.

[0012] After a lot of creative research, the applicant unexpectedly found that when the mass ratio of epoxy resin to curing agent in the system is (80-90): (85-90), not only can the two-component caulking agent have a suitable surface drying time, hardness and flexibility, but also the yellowing resistance of the caulking agent is improved, and the yellowing resistance level of the system can reach level 1. It may be that when the mass ratio of epoxy resin to curing agent is (80-90): (85-90), the cross-linking strength of epoxy resin and curing agent can better wrap the UV additive in the system, making it evenly dispersed in the cross-linking network, and the three work synergistically to improve the yellowing resistance of the system.

[0013] In one embodiment, the epoxy resin is a hydrogenated epoxy resin.

[0014] In one embodiment, the epoxy resin has a viscosity of 4600-7500 cps at 25°C.

[0015] In a preferred embodiment, the epoxy resin is purchased from Guangzhou Liantuo New Materials Co., Ltd. with a brand number of 5240A-QS.

[0016] In one embodiment, the curing agent is a hydrogenated curing agent.

[0017] In one embodiment, the hydrogenated curing agent is one or more of a modified alicyclic amine epoxy resin curing agent, a modified aliphatic polyamine epoxy resin curing agent, and a modified aromatic polyamine epoxy resin curing agent.

[0018] In a preferred embodiment, the hydrogenated curing agent is a modified alicyclic amine epoxy resin curing agent.

[0019] In one embodiment, the hydrogenated curing agent has a viscosity of 1000-2500 cps at 25°C.

[0020] In a preferred embodiment, the hydrogenated curing agent is purchased from Guangzhou Liantuo New Materials Co., Ltd. with the brand name LB-5240.

[0021] After a lot of creative research, the applicant unexpectedly discovered that when the viscosity of the epoxy resin at 25°C is 4600-7500cps and the viscosity of the hydrogenated curing agent at 25°C is 1000-2500cps, the cross-linking strength generated by the reaction of the epoxy resin and the curing agent can balance the hardness and bonding strength of the caulking agent, thereby achieving a simultaneous improvement of both; in addition, by adjusting the viscosity of the epoxy resin and the curing agent, not only can the fluidity and distribution state of the fumed silica in the system be effectively managed, as well as the thixotropy of the system be affected, but also a more uniform reaction between the epoxy resin and the curing agent can be ensured.

[0022] In one embodiment, the first filler and the second filler both contain at least one of hydrophobic fumed silica and hydrophilic fumed silica.

[0023] In a preferred embodiment, the first filler includes hydrophobic fumed silica and hydrophilic fumed silica.

[0024] In a preferred embodiment, the mass ratio of the hydrophobic fumed silica to the hydrophilic fumed silica is 1:2.

[0025] In a preferred embodiment, the second filler comprises hydrophilic fumed silica.

[0026] In one embodiment, the nitrogen adsorption specific surface area of ​​the hydrophobic fumed silica is 90-140 m 2 / g, the nitrogen adsorption specific surface area of ​​the hydrophilic fumed silica is 180-220m 2 / g.

[0027] In a preferred embodiment, the hydrophobic fumed silica was purchased from Anhui Zaisheng New Materials Co., Ltd. with a brand name of KS-2200; the hydrophilic fumed silica was purchased from Hubei Huifu Nanomaterials Co., Ltd. with a brand name of HL-200.

[0028] In one embodiment, the diluent is an inactive diluent.

[0029] In a preferred embodiment, the inactive diluent is selected from at least one of ethylene glycol, benzyl alcohol, benzaldehyde, ethyl acetate, dibutyl phthalate and acetone.

[0030] In a more preferred embodiment, the diluent is a mixture of benzyl alcohol and benzaldehyde, purchased from Xiamen Xinya Applied Materials Co., Ltd. with a brand name of XSJ-001.

[0031] In one embodiment, the first defoaming agent and the second defoaming agent both include a foam breaking polymer and a polysiloxane.

[0032] In a preferred embodiment, the brands of the first defoamer and the second defoamer are at least one of BYK-070, BYK-070SG, BYK-088, and BYK-A530.

[0033] In a more preferred embodiment, the first defoamer and the second defoamer are both BYK-A530, purchased from Dalian Liansheng Trading Co., Ltd.

[0034] In one embodiment, the viscosity of the flow-stopping agent at 25° C. is 5000-7000 cps.

[0035] In a preferred embodiment, the flow stopper is purchased from Foshan Sanjingli Caimeiyi Electronic Materials Co., Ltd. with the brand name OT-801.

[0036] In one embodiment, the pigment is purchased from Shanghai Yanbei Fine Chemical Co., Ltd.

[0037] In one embodiment, the UV auxiliary agent is an ultraviolet absorber.

[0038] In a preferred embodiment, the brand of the ultraviolet absorber is at least one of UV-1, UV-196, and UV-1130.

[0039] In a more preferred embodiment, the brand of the ultraviolet absorber is UV-1, which is purchased from Guangzhou Zhiyi Chemical Co., Ltd.

[0040] The second aspect of the present invention provides a method for preparing a two-component seam beautifying agent, comprising at least the following steps:

[0041] S1. Preparation of component A: Mix the epoxy resin with the first defoamer and the diluent, add the first filler after stirring evenly, vacuum and stir, and can;

[0042] S2, preparation of component B: mix the curing agent with the second defoamer, the flow stopper and the UV additive, add the second filler after stirring evenly, vacuum and stir, and can;

[0043] S3. When using, stir and mix component A and component B according to the mass ratio.

[0044] In one embodiment, the conditions for uniform stirring in steps S1 and S2 are: a dispersion disk speed of 45r, a wall hanging speed of 40r, and stirring for 10 minutes.

[0045] In one embodiment, the first filler is added in step S1 by first adding hydrophobic fumed silica and then adding hydrophilic fumed silica.

[0046] In one embodiment, the vacuum stirring conditions in steps S1 and S2 are: the vacuum negative pressure value reaches a state of -1 MPa, the dispersion disk speed is 45r, the wall hanging speed is 40r, and the stirring is 10min.

[0047] The first filler and the second filler of the present application are added in an amount not exceeding 3 kg / time at most, and those exceeding 3 kg need to be added in batches.

[0048] Beneficial Effects

[0049] 1. The present application adopts hydrogenated epoxy resin and hydrogenated curing agent to improve the yellowing resistance of the two-component seam beautifying agent.

[0050] 2. The present application controls the mass ratio of hydrogenated epoxy resin to hydrogenated curing agent to (80-90): (85-90), which not only ensures that the two-component caulking agent has a suitable surface drying time, hardness and flexibility, but also improves the yellowing resistance of the caulking agent, and the yellowing resistance grade of the system can reach Grade 1.

[0051] 3. The present application can balance the hardness and bonding strength of the two-component caulking agent by controlling the viscosity of the epoxy resin and the curing agent.

[0052] 4. This application can further promote the improvement of the yellowing resistance and storage stability of the two-component caulking agent by adopting specific additives and fillers.

[0053] 5. The two-component seam beautifier prepared by a specific process in this application can prevent the two-component seam beautifier from agglomerating, and the seam beautifier has excellent yellowing resistance and mechanical properties. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The experimental methods in the examples without specifying specific conditions are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used without specifying the manufacturer are all conventional products that can be purchased commercially.

[0055] Example 1

[0056] The first aspect of the present embodiment provides a two-component seam beautifying agent. Calculated by weight, the raw materials for preparing component A include: 89.7 parts of epoxy resin, 0.3 parts of a first defoamer, 4 parts of a diluent, and 6 parts of a first filler; the raw materials for preparing component B include: 88.3 parts of a curing agent, 0.2 parts of a second defoamer, 1.5 parts of a flow stopper, 6 parts of a second filler, 1 part of a UV additive, and 3 parts of a pigment.

[0057] The mass ratio of component A to component B is 1:1.

[0058] The epoxy resin has a viscosity of 4600-7500 cps at 25° C. and is purchased from Guangzhou Liantuo New Materials Co., Ltd. with a brand number of 5240A-QS.

[0059] The hydrogenated curing agent is a modified alicyclic amine epoxy resin curing agent.

[0060] The hydrogenated curing agent has a viscosity of 1000-2500 cps at 25° C. and is purchased from Guangzhou Liantuo New Materials Co., Ltd. with a brand name of LB-5240.

[0061] The first filler is hydrophobic fumed silica and hydrophilic fumed silica. The second filler is hydrophilic fumed silica. The mass ratio of the hydrophobic fumed silica to the hydrophilic fumed silica is 1:2.

[0062] The nitrogen adsorption specific surface area of ​​the hydrophobic fumed silica is 90-140 m 2 / g, purchased from Anhui Zaisheng New Materials Co., Ltd., brand name KS-2200.

[0063] The nitrogen adsorption specific surface area of ​​the hydrophilic fumed silica is 180-220 m 2 / g, purchased from Hubei Huifu Nanomaterials Co., Ltd., brand HL-200.

[0064] The diluent is a mixture of benzyl alcohol and benzaldehyde, purchased from Xiamen Xinya Applied Materials Co., Ltd., with the brand name XSJ-001.

[0065] The first defoamer and the second defoamer are both BYK-A530, purchased from Dalian Liansheng Trading Co., Ltd.

[0066] The flow stop agent has a viscosity of 5000-7000 cps at 25° C. and is purchased from Foshan Sanjing Caimeiyi Electronic Materials Co., Ltd. with a brand name of OT-801.

[0067] The pigment was purchased from Shanghai Yanbei Fine Chemical Co., Ltd.

[0068] The UV auxiliary agent is an ultraviolet absorber, the brand of the ultraviolet absorber is UV-1, and it is purchased from Guangzhou Zhiyi Chemical Co., Ltd.

[0069] A second aspect of the present embodiment provides a method for preparing a two-component seam beautifying agent, comprising at least the following steps:

[0070] S1. Preparation of component A: Mix the epoxy resin with the first defoamer and the diluent, add the first filler after stirring evenly, vacuum and stir, and can;

[0071] S2, preparation of component B: mix the curing agent with the second defoamer, the flow stopper, the pigment and the UV additive, stir evenly, add the second filler, vacuum and stir, and can;

[0072] S3. When using, stir and mix component A and component B according to the mass ratio.

[0073] The conditions for uniform stirring in steps S1 and S2 are: a dispersion disk speed of 45 r, a wall hanging speed of 40 r, and stirring for 10 min.

[0074] The first filler is added in step S1 by first adding hydrophobic fumed silica and then adding hydrophilic fumed silica.

[0075] The conditions for vacuum stirring in steps S1 and S2 are: the vacuum negative pressure reaches -1 MPa, the speed of the dispersion disk is 45r, the speed of the wall hanging is 40r, and the stirring is for 10 minutes.

[0076] Comparative Example 1

[0077] The specific implementation method of this comparative example is the same as that of Example 1, except that the raw materials for preparing the component A include: 84.7 parts of epoxy resin, 0.3 parts of a first defoamer, 4 parts of a diluent, and 11 parts of a first filler; the raw materials for preparing the component B include: 83.3 parts of a curing agent, 0.2 parts of a second defoamer, 1.5 parts of a flow stopper, 11 parts of a second filler, 1 part of a UV additive, and 3 parts of a pigment.

[0078] The mass ratio of component A to component B is 1:1.

[0079] The first filler is hydrophobic fumed silica, hydrophilic fumed silica and 3000 mesh glass powder. The second filler is hydrophilic fumed silica and 3000 mesh glass powder.

[0080] The mass ratio of hydrophobic fumed silica, hydrophilic fumed silica and 3000 mesh glass powder in the first filler is 2:4:5.

[0081] The mass ratio of hydrophilic fumed silica to 3000 mesh glass powder in the second filler is 6:5.

[0082] The 3000 mesh glass powder was purchased from Shijiazhuang Wende Mineral Products Co., Ltd.

[0083] Comparative Example 2

[0084] The specific implementation method of this comparative example is the same as that of Example 1, except that the raw materials for preparing the component A include: 79.7 parts of epoxy resin, 0.3 parts of a first defoamer, 4 parts of a diluent, and 16 parts of a first filler; the raw materials for preparing the component B include: 78.3 parts of a curing agent, 0.2 parts of a second defoamer, 1.5 parts of a flow stopper, 16 parts of a second filler, 1 part of a UV additive, and 3 parts of a pigment.

[0085] The mass ratio of component A to component B is 1:1.

[0086] The first filler is hydrophobic fumed silica, hydrophilic fumed silica and 3000 mesh glass powder. The second filler is hydrophilic fumed silica and 3000 mesh glass powder.

[0087] The mass ratio of hydrophobic fumed silica, hydrophilic fumed silica and 3000 mesh glass powder in the first filler is 1:2:5.

[0088] The mass ratio of the hydrophilic fumed silica to the 3000 mesh glass powder in the second filler is 3:5.

[0089] The 3000 mesh glass powder was purchased from Shijiazhuang Wende Mineral Products Co., Ltd.

[0090] Comparative Example 3

[0091] The specific implementation method of this comparative example is the same as that of Example 1, except that the raw materials for preparing the component A include: 89.7 parts of epoxy resin, 0.3 parts of a first defoamer, 4 parts of a diluent, and 6 parts of a first filler; the raw materials for preparing the component B include: 88.3 parts of a curing agent, 0.2 parts of a second defoamer, 1.5 parts of a flow stopper, 6 parts of a second filler, 1 part of a UV additive, and 3 parts of a pigment.

[0092] The mass ratio of component A to component B is 1:1.

[0093] The first filler is hydrophilic fumed silica. The second filler is hydrophilic fumed silica.

[0094] Comparative Example 4

[0095] The specific implementation method of this comparative example is the same as that of Example 1, except that the raw materials for preparing the component A include: 89.7 parts of epoxy resin, 0.3 parts of a first defoamer, 4 parts of a diluent, and 6 parts of a first filler; the raw materials for preparing the component B include: 88.3 parts of a curing agent, 0.2 parts of a second defoamer, 1.5 parts of a flow stopper, 6 parts of a second filler, 1 part of a UV additive, and 3 parts of a pigment.

[0096] The mass ratio of component A to component B is 1:1.

[0097] The first filler is hydrophobic fumed silica. The second filler is hydrophilic fumed silica.

[0098] Performance Testing

[0099] The two-component seam beautifier prepared in each embodiment and comparative example was tested as follows, wherein the storage stability was tested by testing the sag of the two-component seam beautifier after heat storage at room temperature, 70°C for 7 days and 14 days, respectively. The test results are shown in Table 1.

[0100] Table 1

[0101]

[0102]

Claims

1. A two-component seam beautifying agent, characterized in that: The preparation raw materials include: component A and component B; the preparation raw materials of component A include epoxy resin, a first defoamer, a diluent, and a first filler; the preparation raw materials of component B include a curing agent, a second defoamer, a flow stopper, a second filler, and a UV additive.

2. The two-component seam beautifying agent according to claim 1, characterized in that: Calculated by weight, the raw materials for preparing component A include: 75-95 parts of epoxy resin, 0-1 parts of first defoamer, 2-6 parts of diluent, and 4-8 parts of first filler; the raw materials for preparing component B include: 70-90 parts of curing agent, 0-1 parts of second defoamer, 1-2 parts of flow stopper, 4-8 parts of second filler, and 0.5-2 parts of UV additive.

3. The two-component seam beautifying agent according to any one of claims 1 to 2, characterized in that: The mass ratio of the component A to the component B is 1:(0.9-1).

4. The two-component seam beautifying agent according to claim 1, characterized in that: The epoxy resin has a viscosity of 4600-7500 cps at 25°C.

5. The two-component seam beautifying agent according to claim 1, characterized in that: The curing agent is a hydrogenated curing agent.

6. The two-component seam beautifying agent according to claim 5, characterized in that: The hydrogenated curing agent is one or more of a modified alicyclic amine epoxy resin curing agent, a modified aliphatic polyamine epoxy resin curing agent, and a modified aromatic polyamine epoxy resin curing agent.

7. The two-component seam beautifying agent according to claim 6, characterized in that: The viscosity of the hydrogenated curing agent at 25° C. is 1000-2500 cps.

8. The two-component seam beautifying agent according to claim 1, characterized in that: The first filler and the second filler both contain at least one of hydrophobic fumed silica and hydrophilic fumed silica.

9. The two-component seam beautifying agent according to claim 8, characterized in that: The nitrogen adsorption specific surface area of ​​the hydrophobic fumed silica is 90-140 m 2 / g, the nitrogen adsorption specific surface area of ​​the hydrophilic fumed silica is 180-220m 2 / g.

10. A method for preparing a two-component seam beautifying agent according to any one of claims 1 to 8, characterized in that: At least the following steps are included: S1. Preparation of component A: Mix the epoxy resin with the first defoamer and the diluent, add the first filler after stirring evenly, vacuum and stir, and can; S2, preparation of component B: mix the curing agent with the second defoamer, the flow stopper and the UV additive, add the second filler after stirring evenly, vacuum and stir, and can; S3. When using, stir and mix component A and component B according to the mass ratio.

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