High-elasticity and high-viscosity elastic sealing structure as well as preparation method and application thereof

Abstract

The invention provides a high-elasticity and high-viscosity elastic sealing structure and a preparation method and application thereof, and the high-elasticity and high-viscosity elastic sealing structure comprises a hydrogenated styrene-butadiene block copolymer, high-molecular polyisobutene, white carbon black, liquid silicone rubber, an antioxidant, an ultraviolet stabilizer, a low-molecular plasticizer, white oil and petroleum resin C9. Through a specific component proportion and a preparation process, the sealing material shows excellent high elasticity and high viscosity characteristics, can quickly restore to the original shape after being stressed and deformed, remarkably improves the sealing performance, and is suitable for solving the problem of preventing water leakage and gas leakage in the installation process of a toilet.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen and bathroom waterproof sealing materials, in particular to an elastic sealing structure with high elasticity and high viscosity, a preparation method thereof, and an application thereof. Background Art

[0002] During the installation of a toilet, the flange ring, as a key sealing component, is mainly used to prevent water leakage and air leakage. Traditional toilet flange rings usually consist of a flange plate and the surrounding sealing material. Among them, the flange plate undertakes the functions of guiding flow and support, while the sealing material realizes the sealed connection between the ground sewer pipe and the bottom outlet pipe of the toilet. According to the national building materials industry standard JC / T 2118-2012 "Sealing Device for Toilet Drainage Outlet" of the People's Republic of China, the technical requirements, test methods, and inspection rules for the sealing device of the toilet drainage outlet are clearly specified.

[0003] Currently, the toilet flange rings on the market are mainly divided into two categories: rubber type and wax type. Although these two materials show their respective applicability in different application scenarios, they both have a common problem: they are prone to permanent deformation after being stressed.

[0004] Specifically, when the toilet is completely fixed to the ground, the flange ring can provide a good sealing effect; however, once the toilet becomes loose due to external force or improper installation, the flange ring may not be able to return to its original state due to lack of sufficient elasticity, resulting in seal failure and water leakage or air leakage. Existing sealing materials mainly rely on viscous properties and are difficult to take into account the elastic recovery ability under uneven stress, which significantly affects their long-term use performance.

[0005] Based on the above problems, there is an urgent need in this field to develop a new type of elastic sealing structure that should simultaneously possess high elasticity and high viscosity characteristics to effectively cope with the complex stress environment during the installation of the toilet and significantly improve the stability and reliability of the sealing performance.

[0006] In view of this, the inventor of the present invention specifically designed an elastic sealing structure with high elasticity and high viscosity, a preparation method thereof, and an application thereof, and this case thus emerged. Summary of the Invention

[0007] In order to solve the above problems, one of the technical solutions of the present invention is as follows: An elastic sealing structure with high elasticity and high viscosity, which is composed of the following components in parts by weight: Hydrogenated styrene-butadiene block copolymer: 40-60 parts; High molecular weight polyisobutylene: 15-25 parts; Silica: 5-10 parts; Liquid silicone rubber: 5-15 parts; Antioxidants and ultraviolet stabilizers: 1 - 3 parts; Low molecular weight plasticizer: 3 - 7 parts; Petroleum resin C9: 5 - 10 parts; White oil: 5 - 10 parts.

[0008] Preferably, the molecular weight of the high molecular weight polyisobutylene is 100,000 - 500,000, and the melt index is 2 - 5 g / 10 min.

[0009] Preferably, the liquid silicone rubber is room temperature vulcanizing type.

[0010] Preferably, the low molecular weight plasticizer is dibutyl phthalate or dioctyl phthalate.

[0011] The second technical solution of the present invention is as follows: A preparation method of an elastic sealing structure, comprising the following steps: S1. Add hydrogenated styrene-butadiene block copolymer, liquid silicone rubber, white carbon black, antioxidant, ultraviolet stabilizer, low molecular weight plasticizer, petroleum resin C9 and white oil into a single-screw reactor according to the ratio, and stir at 160 - 180 °C for 240 - 300 minutes to form a matrix mixture; S2. Add high molecular weight polyisobutylene to the matrix mixture and continue to stir until evenly dispersed; S3. Place the mixture in a vacuum degassing device and degas for 10 minutes to remove internal bubbles; S4. Pour the degassed mixture into a preheated mold and use forced cooling to quickly cure and form an elastic sealing structure; S5. Perform surface silicone oil treatment on the formed elastic sealing structure to improve its water resistance and lubricity.

[0012] Preferably, in step S3, the degassing step is carried out under the condition of a vacuum degree of 0.08 - 0.1 MPa.

[0013] Preferably, in step S3, the curing and forming step is carried out under the condition that the preheating temperature of the mold is 180 °C and the cooling temperature is 160 °C.

[0014] The third technical solution of the present invention is as follows: An application of an elastic sealing structure for sealing a toilet flange to prevent water leakage and air leakage.

[0015] The beneficial effects of the present invention are as follows: The elastic sealing structure provided by the present invention has both high elasticity and high viscosity characteristics, can effectively solve the problem that the existing sealing materials lose their sealing function after uneven stress or deformation, and has broad application prospects and significant technical advantages. Detailed implementation mode

[0016] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention will be further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Embodiment 1

[0017] A highly elastic and highly viscous elastic sealing structure is composed of the following components in parts by weight: Hydrogenated styrene-butadiene block copolymer (SEBS): 40 parts High molecular weight polyisobutylene: 15 parts Fumed silica: 5 parts Liquid silicone rubber (LSR): 10 parts Antioxidant and ultraviolet stabilizer: 1 part Dibutyl phthalate (DBP): 3 parts Petroleum resin C9: 5 parts White oil: 5 parts Among them, with the hydrogenated styrene-butadiene block copolymer (SEBS) as the matrix, combined with high molecular weight polyisobutylene, liquid silicone rubber (LSR) and fumed silica, the synergistic effect of high elasticity and high viscosity is achieved.

[0018] The molecular weight of the high molecular weight polyisobutylene is 100,000 to 500,000, and the melt index is 2 to 5 g / 10 min.

[0019] SEBS: Provides flexibility and resistance to permanent deformation.

[0020] Liquid silicone rubber (room temperature vulcanization type): Improves viscosity and sealing performance.

[0021] It is prepared and formed through the following steps: S1, mixing: Add SEBS, LSR, fumed silica, antioxidant, ultraviolet stabilizer, low molecular weight plasticizer, white oil and petroleum resin C9 into a single-screw reactor according to the ratio, and stir at 160-180 °C for 240-300 minutes to form a matrix mixture.

[0022] S2, adding and mixing: Add high molecular weight polyisobutylene to the matrix mixture and continue to stir until evenly dispersed.

[0023] S3, degassing: Place the mixture in a vacuum degassing device and degas for 10 minutes to remove internal bubbles and improve the density of the material.

[0024] S4, molding and curing: Pour the degassed mixture into a mold preheated to 180 °C, and adopt a forced cooling method at 160 °C to make it quickly solidify and form to obtain the required elastic sealing structure.

[0025] S5, Surface treatment: The formed sealing structure is treated with silicone oil on the surface to improve its water resistance and lubricity.

[0026] Among them, in step S1, first mix the matrix material (150 - 160 °C), and then add high molecular weight polyisobutylene to avoid structural damage.

[0027] In step S3, vacuum degassing (0.08 - 0.1 MPa): Reduce bubbles and improve density.

[0028] In step S4, rapid curing (preheat the mold at 180 °C + forced cooling at 160 °C): Shorten the molding cycle and ensure micro - uniformity.

[0029] In addition, the specific selection of each component in this embodiment is as follows: Hydrogenated styrene - butadiene block copolymer (SEBS): Kraton D1101P (Kraton Chemical, tensile strength: about 15 MPa; elongation at break: about 450%; melting point: about 135 °C) High molecular weight polyisobutylene: Indopol H - 1000 (INEOS, molecular weight: about 300,000, melt index: about 3 g / 10 min) Fumed silica: Cab - O - Sil TS - 720 (Cabot, specific surface area: about 200 m² / g; density: about 0.05 g / cm³) Liquid silicone rubber (LSR): Elastosil LR 3003 / 50 (Wacker Chemical, hardness: Shore A about 50; tensile strength: about 7 MPa; operating temperature range: - 60 °C to + 200 °C) Antioxidant: Irganox 1010 (BASF, molecular weight: about 614 g / mol; melting point: about 125 °C) UV stabilizer: Tinuvin 770 (Clariant, chemical composition: bisphenol compound; service temperature range: - 30 °C to + 120 °C).

[0030] Dibutyl phthalate (DBP): Molecular weight: about 278 g / mol; density: about 1.05 g / cm³.

[0031] Dioctyl phthalate (DOP): Molecular weight: about 390 g / mol; density: about 0.99 g / cm³.

[0032] Petroleum resin C9: Escorez 5380 (ExxonMobil, softening point between 100 - 130 °C, acid value < 1 mgKOH / g) White oil: Medipure FG 350 (Croda, viscosity 10 cSt, flash point 230 °C, color number +40) Example 2

[0033] A highly elastic and highly viscous elastic sealing structure, which is different from Example 1, is composed of the following components in parts by weight: Hydrogenated styrene-butadiene block copolymer (SEBS): 50 parts High molecular weight polyisobutylene: 20 parts Fumed silica: 7.5 parts Liquid silicone rubber (LSR): 15 parts Antioxidant and ultraviolet stabilizer: 2 parts Dibutyl phthalate (DBP): 5 parts Petroleum resin C9: 7 parts; White oil: 6 parts. Example 3

[0034] A highly elastic and highly viscous elastic sealing structure, which is different from Example 1, is composed of the following components in parts by weight: Hydrogenated styrene-butadiene block copolymer (SEBS): 60 parts High molecular weight polyisobutylene: 25 parts Fumed silica: 10 parts Liquid silicone rubber (LSR): 20 parts Antioxidant and ultraviolet stabilizer: 3 parts Dibutyl phthalate (DBP): 7 parts Petroleum resin C9: 10 parts White oil: 8 parts. Example 4

[0035] A highly elastic and highly viscous elastic sealing structure, which is different from Example 1, is composed of the following components in parts by weight: Hydrogenated styrene-butadiene block copolymer (SEBS): 50 parts High molecular weight polyisobutylene: 15 parts Fumed silica: 10 parts Liquid silicone rubber (LSR): 10 parts Antioxidant and ultraviolet stabilizer: 2 parts Dibutyl phthalate (DBP): 7 parts Petroleum resin C9: 10 parts White oil: 10 parts.

[0036] Performance test:

[0037] Test group settings: Experimental group 1: Molded with the ratio and preparation method in Example 1.

[0038] Experimental group 2: Molded with the ratio and preparation method in Example 2.

[0039] Experimental group 3: Molded with the ratio and preparation method in Example 3.

[0040] Experimental group 4: Molded with the ratio and preparation method in Example 4.

[0041]

[0042] Experimental group 3 is the best group, among which: In terms of resilience, the recovery time is short and the recovery rate is high, indicating that the material can quickly return to its original state after being compressed and has excellent elastic properties.

[0043] In terms of hardness, the hardness value is moderate, ensuring that while providing sufficient sealing, the material has good flexibility, facilitating installation and adapting to contact surfaces of different shapes.

[0044] In terms of durability: After aging for 500 hours in a high-temperature and high-humidity environment, the hardness only increases by 6 units and the mass change rate is 1.7%, showing the excellent aging resistance of the material and being suitable for long-term use.

[0045] In terms of sealing performance: Under a high water pressure of 1.5 MPa, the first leakage time reaches 192 hours, proving that the material has excellent sealing ability and can effectively prevent water and air leakage.

[0046] Analysis shows that: The combination of SEBS and LSR provides the basic elasticity and flexibility of the material, enabling it to quickly recover after being compressed. The addition of high molecular polyisobutylene and silica not only improves the mechanical strength and wear resistance of the material, but also enhances the sealing performance by forming a micro-porous structure. The synergistic effect of antioxidants, UV stabilizers and low molecular plasticizers improves the aging resistance of the material and extends its service life.

[0047] In summary, the present invention is applicable to the sealed connection of the toilet base in the kitchen and bathroom fields, and can preferably solve the problems of water and air leakage and sealing failure during the installation of the toilet.

[0048] The above is an exemplary description of the present invention. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A high elasticity, high viscosity elastic sealing structure, characterized in that: It is composed of the following components in parts by weight: Hydrogenated styrene-butadiene block copolymer: 40-60 parts; High molecular weight polyisobutylene: 15-25 parts; White carbon black: 5-10 parts; Liquid silicone rubber: 5-15 parts; Antioxidants and UV stabilizers: 1 to 3 parts; Low molecular plasticizer: 3-7 parts; Petroleum resin C9: 5-10 parts; White oil: 5-10 parts.

2. The high elasticity and high viscosity elastic sealing structure according to claim 1, characterized in that: The molecular weight of the high molecular weight polyisobutylene is 100,000 to 500,000, and the melt index is 2 to 5 g / 10 min.

3. The high elasticity and high viscosity elastic sealing structure according to claim 1, characterized in that: The liquid silicone rubber is room temperature vulcanized.

4. The high elasticity and high viscosity elastic sealing structure according to claim 1, characterized in that: The low molecular plasticizer is dibutyl phthalate or dioctyl phthalate.

5. A method for preparing the elastic sealing structure according to claim 1, characterized in that: The steps include: S1, adding hydrogenated styrene-butadiene block copolymer, liquid silicone rubber, white carbon black, antioxidant, ultraviolet stabilizer, low molecular plasticizer, petroleum resin C9 and white oil into a single screw reactor according to proportion, stirring at 160-180° C. for 240-300 minutes to form a matrix mixture; S2. Add high molecular weight polyisobutylene to the matrix mixture and continue stirring until it is evenly dispersed; S3, placing the mixture in a vacuum degassing device and degassing for 10 minutes to remove internal bubbles; S4, pouring the degassed mixture into a preheated mold, and using forced cooling to rapidly solidify and shape the mixture to obtain an elastic sealing structure; S5. The surface of the molded elastic sealing structure is treated with silicone oil to improve its water resistance and lubricity.

6. The preparation method according to claim 5, characterized in that: In step S3, the degassing step is performed under the condition of a vacuum degree of 0.08 to 0.1 MPa.

7. The preparation method according to claim 5, characterized in that: In step S3, the curing molding step is performed under the conditions of a mold preheating temperature of 180°C and a cooling temperature of 160°C.

8. An application of the elastic sealing structure according to claim 1, characterized in that: The elastic sealing structure is used for sealing the flange ring of the toilet to prevent water leakage and air leakage.

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