A foaming silicone material formulation and production method for waterproof sealing

Abstract

The present invention relates to a foamed silicone material for waterproof sealing, specifically a formulation and production method of a foamed silicone material for waterproof sealing. The material comprises component A and component B. Component A is composed of the following substances in parts by mass: 160 - 200 parts of α,ω - dihydroxypolysiloxane, 8 - 12 parts of hydrogen - containing silicone oil, 0.8 - 1.2 parts of glycerol, 0.08 - 0.12 parts of 1 - ethynylcyclohexanol; Component B is composed of the following substances in parts by mass: 18 - 22 parts of fumed silica, 1 - 3 parts of auxiliary agent, 0.01 - 2 parts of catalyst. The foamed silicone material for waterproof sealing provided by the present invention has low density, good fire - proof performance, simple production method, wide application, and has good popularization and application prospects.

Description

Technical Field

[0001] The present invention relates to a foamed silicone material for waterproof sealing, specifically to a formula and production method of a foamed silicone material for waterproof sealing. Background Art

[0002] Organic compounds of silicon (Si) have been synthesized in the past 70 years, and more than 70,000 known structures are available. Organosilicon polymers refer to various polymers with a silicon-carbon bond as the main chain, and it is the most rapidly developing branch in the field of organoelement polymers. Organosilicon rubber is a compound in which silicon atoms are directly connected to carbon atoms in at least one organic group (alkyl or carboxyl group, etc.). Its main chain is of the Si - O - Si structure. The bond length and bond angle of the silicon-oxygen bond are relatively large, the molecular chain is flexible, the surface energy is low, and the molecular side chain contains organic groups, having good hydrophobicity and low surface tension. The material is relatively easy to process, and various products can be made from liquid to solid, from soft to rigid.

[0003] Due to its special structure and composition, the organosilicon rubber molecule has the dual advantages of inorganic and organic substances. However, it also has obvious disadvantages. For example, there are no rigid groups in its main chain, resulting in relatively low mechanical strength. Even a linear organosilicon rubber with a molecular weight of up to 500,000 has cold flow properties, and various means such as crosslinking and reinforcement are required to improve its mechanical properties. At the same time, the side groups on the main chain of organosilicon rubber play a crucial role because, depending on their functional groups, the materials exhibit different characteristics and can be applied to different fields.

[0004] The foamed silicone rubber produced by the condensation dehydrogenation method has many performance advantages and is the mainstream method for producing foamed silica gel at present. During the dehydrogenation process of foamed silica gel, crosslinking points are simultaneously formed, causing the viscosity of the system to increase synchronously, so that a certain amount of gas can be retained to form uniform pores. Compared with foams such as polyurethane and EVA, the density of organosilicon foamed materials is relatively high, and it is difficult to achieve below 0.55 because the hydrogen overflow rate is relatively fast and the crosslinking rate is difficult to match. If the silica gel can be rapidly crosslinked while dehydrogenating, more gas can be gathered, achieving a lower foaming density, thereby reducing the cost of foamed silica gel and enabling more lightweight applications.

[0005] CN 115304920 A This invention relates to a silicone foam material, its production method and applications. The silicone foam material includes component A and component B; wherein: Component A includes the following components in parts by weight: 100 parts of base material, 12 - 20 parts of hydroxyl silicone oil, 5 - 10 parts of hydrogen-containing silicone oil, 5 - 10 parts of silane composition, 5 - 10 parts of co-foaming agent, 0.8 - 2.15 parts of colorant; Component B includes the following components in parts by weight: 100 parts of base material, 8 - 15 parts of vinyl silicone oil, 0.05 - 0.2 parts of catalyst, 0.08 - 0.25 parts of inhibitor. This silicone foam material can be cured at room temperature. After curing, the silicone foam material has a high foaming volume increase multiple, uniform bubble pore sizes, low hardness and good toughness of the formed colloid, high resilience after compression, is not prone to collapse, and also has good low-temperature resistance, ablation resistance and radiation resistance. Summary of the Invention

[0006] (I) Technical problems to be solved

[0007] In view of the deficiencies of the prior art, this invention provides a formulation and production method of a foaming silicone material for waterproof sealing.

[0008] (II) Technical solutions

[0009] To achieve the above objectives, this invention provides a foaming silicone material for waterproof sealing, which is characterized by including component A and component B. Component A is composed of the following substances in parts by mass:

[0010] 160 - 200 parts of α,ω-dihydroxypolysiloxane

[0011] 8 - 12 parts of hydrogen-containing silicone oil

[0012] 0.8 - 1.2 parts of glycerol

[0013] 0.08 - 0.12 parts of 1-ethynylcyclohexanol;

[0014] Component B is composed of the following substances in parts by mass:

[0015] 18 - 22 parts of fumed silica

[0016] 2 - 8 parts of auxiliary agent

[0017] 0.01 - 2 parts of catalyst.

[0018] Further, the α,ω-dihydroxypolysiloxane includes three types of α,ω-dihydroxypolysiloxane with viscosities of 1000 mPa·s, 5000 mPa·s, and 20000 mPa·s, and their mass ratio is 10:5:3. An appropriate liquid viscosity can encapsulate the gas generated by the foaming reaction, and the foam can grow at a uniform speed, and the foam has excellent tear resistance. When the viscosity is too low, the strength of the matrix itself is small, so that the gas generated by the foaming reaction easily penetrates through the cell wall and escapes to form large cell pores. Therefore, the present invention uses a mixture of several viscosities of α,ω-dihydroxypolysiloxane, which not only ensures the residence time of the gas in the foamed material, but also avoids the generation of large cell pores and ensures the performance of the produced silicone material.

[0019] Further, the fumed silica is fumed silica with surface organophilic treatment. By using organophilic-treated fumed silica, its compatibility with silicone oil is better, which helps to improve the performance of the material.

[0020] Further, the active hydrogen content of the hydrogen-containing silicone oil is 1.6 wt%.

[0021] Further, the catalyst is at least one of platinum-containing, hafnium oxide, and iridium-cobalt nanoalloy. When part or all of the catalyst is hafnium oxide or iridium-cobalt nanoalloy, because its cost is significantly reduced, the cost of the produced silicone material is further reduced.

[0022] Further, the platinum catalyst is chloroplatinic acid-divinyltetramethyldisiloxane or platinum-xylene.

[0023] Further, the auxiliary agent is nanoammonium bicarbonate or nanocalcium carbonate. When the auxiliary agent is nanocalcium carbonate, due to its small density and good compatibility, it can still be evenly dispersed in the whole system after stirring and during the foaming process. The produced silicone material has uniform cell pores and is an excellent nucleating agent. When the auxiliary agent is nanoammonium bicarbonate, in addition to achieving the technical effects of nanocalcium carbonate, ammonium bicarbonate can decompose into carbon dioxide and ammonia during the foaming process, further reducing the density of the produced material. At the same time, when carbon dioxide and ammonia escape outwards, they will encounter the pre-foamed material and further turn into solids, and then serve as nucleating agents again, and then further decompose, and so on until they overflow from the material. Therefore, it takes into account the dual functions of a foaming agent and a nucleating agent and is a better technical choice.

[0024] Further, the component B includes 2 to 3 parts of pseudoboehmite or boehmite. When pseudoboehmite is selected, because its water-containing state is a thixotropic gel, it can also enhance the toughness of the produced foamed material, and the performance is better.

[0025] The present invention also provides a production method of the foamed silicone material for waterproof sealing, comprising the following steps:

[0026] (1) Weigh the raw materials of component A according to the proportion, and obtain component A after stirring and mixing evenly.

[0027] (2) Weigh the raw materials of component B according to the proportion. After mixing, obtain component B after mixing evenly by a grinder.

[0028] (3) Stir component A and component B evenly quickly, and then immediately pour them into a foaming container for foaming.

[0029] In the production method of the present invention, component A and component B must be mixed evenly respectively to ensure the performance of the production material. Mixing component B in advance can reduce the relative concentration of the catalyst and the gas escape rate during the foaming process, with better effects.

[0030] Further, in the step (3), the foaming time is 5 - 10 minutes, and the foaming temperature is between 20 - 40 °C. Only at a suitable foaming temperature can the performance of the catalyst be exerted to enable the gas to escape at a suitable speed. Therefore, the foaming temperature must be controlled appropriately.

[0031] The present invention provides a foamed silicone material for waterproof sealing, which has a low density, good fireproof performance, a simple production method, wide applications, and good prospects for popularization and application.

[0032] (III) Beneficial effects

[0033] Compared with the prior art, the present invention provides a foamed silicone material formula and a production method for waterproof sealing, having the following beneficial effects:

[0034] (1) The produced foamed silicone material for waterproof sealing has a low density, good fireproof performance, and excellent performance.

[0035] (2) The production method is simple, with low cost, and is easy to be popularized and applied industrially. Specific embodiments

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0037] Embodiment 1

[0038] A foamed silicone material for waterproof sealing comprises component A and component B. Component A is composed of the following substances in parts by mass:

[0039] 160 parts of α,ω-dihydroxypolysiloxane

[0040] 8 parts of hydrogen-containing silicone oil with an active hydrogen content of 1.6 wt%

[0041] 1 part of glycerol

[0042] 0.1 part of 1-ethynylcyclohexanol;

[0043] The B component is composed of the following substances in parts by mass:

[0044] 18 parts of fumed silica

[0045] 8 parts of nano calcium carbonate

[0046] 2 parts of pseudo-boehmite

[0047] 0.8 part of chloroplatinic acid-divinyltetramethyldisiloxane

[0048] The above-mentioned α,ω-dihydroxypolysiloxane includes three kinds of α,ω-dihydroxypolysiloxane with viscosities of 1000 mPa·s, 5000 mPa·s, and 20000 mPa·s, and their mass ratio is 10∶5∶3.

[0049] The production method of the above-mentioned foamed silicone material for waterproof sealing includes the following steps:

[0050] (1) Weigh the raw materials of the A component according to the ratio, and obtain the A component after stirring and mixing evenly;

[0051] (2) Weigh the raw materials of the B component according to the ratio, and after mixing, obtain the B component after mixing evenly by a grinder;

[0052] (3) Stir the A component and the B component evenly quickly, and then immediately pour them into a foaming container for foaming. The foaming time is 5 minutes, and the foaming temperature is between 20~28°C.

[0053] Example 2

[0054] A foamed silicone material for waterproof sealing includes an A component and a B component. The A component is composed of the following substances in parts by mass:

[0055] 200 parts of α,ω-dihydroxypolysiloxane

[0056] 12 parts of hydrogen-containing silicone oil with an active hydrogen content of 1.6 wt%

[0057] 1 part of glycerol

[0058] 0.12 part of 1-ethynylcyclohexanol;

[0059] The B component is composed of the following substances in parts by mass:

[0060] 18 parts of surface-organized fumed silica

[0061] 5 parts of nano ammonium bicarbonate

[0062] 3 parts of pseudo-boehmite

[0063] 0.8 part of a mixture of chloroplatinic acid - divinyltetramethyldisiloxane and iridium-cobalt nanoalloy, with a mass ratio of 1:1

[0064] The above α,ω-dihydroxypolysiloxane includes three kinds of α,ω-dihydroxypolysiloxane with viscosities of 1000 mPa·s, 5000 mPa·s, and 20000 mPa·s, and their mass ratio is 10:5:3

[0065] The production method of the above foamed silicone material for waterproof sealing includes the following steps

[0066] (1) Weigh the raw materials of component A in proportion, and obtain component A after stirring and mixing evenly

[0067] (2) Weigh the raw materials of component B in proportion, and after mixing, obtain component B after mixing evenly with a grinder

[0068] (3) Stir component A and component B evenly quickly, and then immediately pour them into a foaming container for foaming. The foaming time is 7 minutes, and the foaming temperature is between 30 and 38 °C

[0069] Example 3

[0070] A foamed silicone material for waterproof sealing includes component A and component B. Component A is composed of the following substances in parts by mass

[0071] 180 parts of α,ω-dihydroxypolysiloxane

[0072] 10 parts of hydrogen-containing silicone oil with an active hydrogen content of 1.6 wt%

[0073] 0.8 part of glycerol

[0074] 0.08 part of 1-ethynylcyclohexanol

[0075] Component B is composed of the following substances in parts by mass

[0076] 18 parts of fumed silica

[0077] 5 parts of nano calcium carbonate

[0078] 2 parts of pseudo-boehmite

[0079] 1 part of hafnium oxide

[0080] The above α,ω-dihydroxypolysiloxane includes three kinds of α,ω-dihydroxypolysiloxane with viscosities of 1000 mPa·s, 5000 mPa·s, and 20000 mPa·s, and their mass ratio is 10∶5∶3.

[0081] The production method of the above-mentioned foamed silicone material for waterproof sealing includes the following steps:

[0082] (1) Weigh the raw materials of component A in proportion, and obtain component A after stirring and mixing evenly;

[0083] (2) Weigh the raw materials of component B in proportion, and after mixing, obtain component B after mixing evenly with a grinder;

[0084] (3) Stir components A and B evenly quickly, then immediately pour them into a foaming container for foaming. The foaming time is 5 minutes, and the foaming temperature is between 20~28°C.

[0085] Example 4

[0086] A foamed silicone material for waterproof sealing includes component A and component B. Component A is composed of the following substances in parts by mass:

[0087] 180 parts of α,ω-dihydroxypolysiloxane

[0088] 10 parts of hydrogen-containing silicone oil with an active hydrogen content of 1.6 wt%

[0089] 1 part of glycerol

[0090] 0.12 part of 1-ethynylcyclohexanol;

[0091] Component B is composed of the following substances in parts by mass:

[0092] 20 parts of surface-organized fumed silica

[0093] 5 parts of nano ammonium bicarbonate

[0094] 3 parts of boehmite

[0095] 1 part of a mixture of platinum-xylene and iridium-cobalt nanoalloy, and their mass ratio is 1∶1.

[0096] The above α,ω-dihydroxypolysiloxane includes three kinds of α,ω-dihydroxypolysiloxane with viscosities of 1000 mPa·s, 5000 mPa·s, and 20000 mPa·s, and their mass ratio is 10∶5∶3.

[0097] The production method of the above-mentioned foamed silicone material for waterproof sealing includes the following steps:

[0098] (1) Weigh the raw materials of component A in proportion, and obtain component A after stirring and mixing evenly;

[0099] (2) Weigh the raw materials of Component B proportionally. After mixing, use a grinder to mix them until uniform to obtain Component B.

[0100] (3) Rapidly stir Component A and Component B evenly, then immediately pour them into a foaming container for foaming. The foaming time is 8 minutes, and the foaming temperature is between 30~38°C.

[0101] Comparative Example 1

[0102] Remove 2 parts of pseudo-boehmite from Component B in Example 2. The others are the same as in Example 2, so details are not repeated.

[0103] Comparative Example 2

[0104] Remove 5 parts of ammonium bicarbonate from Component B in Example 2. The others are the same as in Example 2, so details are not repeated.

[0105] Comparative Example 3

[0106] In the production method of Example 2, mix all components together for foaming. The others are the same as in Example 2, so details are not repeated.

[0107] Conduct performance tests on the samples prepared in the above examples and comparative examples. The results are shown in Table 1.

[0108]

[0109] As can be seen from the data in the above table, the test data of Examples 1~4 are all good. The density of the prepared foamed silicone material is lower than 0.5 g / cm 3 , the volume resistivity is greater than 1.0×10 14 Ω•cm, the tensile strength is greater than 0.35 MPa, the compression set is less than 3%, the flame retardancy is V-0, and the water absorption is less than 20%. The data of Comparative Example 1 show that after removing pseudo-boehmite from Component B, the flame retardancy decreases and the tensile strength decreases significantly; the data of Comparative Example 2 show that after removing 5 parts of ammonium bicarbonate from Component B in Example 2, the density increases and the compression set increases; the data of Comparative Example 3 show that the preparation method has a decisive influence on the performance, and the overall performance decreases significantly.

Claims

1. A foamed silicone material for waterproof sealing, characterized in that: It includes component A and component B, wherein component A is composed of the following materials in parts by weight: composition: 160~200 parts of α-ω-dihydroxy polysiloxane 8~12 parts of hydrogen silicone oil Glycerol 0.8~1.2 parts 0.08 to 0.12 parts of 1-ethynylcyclohexanol; The B component is composed of the following materials in parts by mass: 18-22 parts of fumed silica 2~8 parts of additives Catalyst 0.01~2 parts; Pseudo-boehmite or boehmite 2~3 parts The α-ω-dihydroxy polysiloxane includes three types of α-ω-dihydroxy polysiloxanes with viscosities of 1000 mPa.s, 5000 mPa.s, and 20000 mPa.s, and the mass ratio thereof is 10:5:3; The fumed silica is a fumed silica with an organic surface treatment; The catalyst contains at least one of platinum, hafnium oxide, and iridium-cobalt nano alloy; The auxiliary agent is nano ammonium bicarbonate or nano calcium carbonate.

2. The waterproof sealing foamed silicone material according to claim 1, characterized in that: The active hydrogen content of the hydrogen-containing silicone oil is 1.6 wt %.

3. The waterproof and sealing foamed silicone material according to claim 1, characterized in that: The platinum catalyst is chloroplatinic acid-divinyltetramethyldisiloxane.

4. A method for producing a foamed silicone material for waterproof sealing according to any one of claims 1 to 3, comprising the following steps: (1) Weigh the raw materials of component A in proportion, and stir and mix them evenly to obtain component A; (2) Weigh the raw materials of component B according to the proportion, mix them, and then grind them until they are uniform to obtain component B; (3) Quickly stir component A and component B until evenly mixed, then immediately pour into a foaming container for foaming.

5. The production method according to claim 4, characterized in that: The foaming time in step (3) is 5 to 10 minutes, and the foaming temperature is between 20 and 40°C.

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