Ketoxime-terminated siloxane halogen-free environment-friendly flame-retardant adhesive

Abstract

The invention relates to a ketoxime-terminated siloxane halogen-free environment-friendly flame-retardant adhesive, which belongs to the technical field of adhesive preparation and specifically comprises the following raw materials in parts by weight: hydroxyl silicone oil, dimethyl silicone oil, a flame-retardant fire retardant, fumed silica, a cross-linking agent, a coupling agent, a chain extender, an organic tin catalyst and an end-capping catalyst. The modified ammonium polyphosphate is self-made, the compatibility of the modified ammonium polyphosphate and the basic polymer hydroxyl silicone oil is improved, the additive amount of the modified ammonium polyphosphate in a system is increased, and the flame-retardant and fireproof performance of the system is improved to a certain extent; on the basis, the self-made modified ammonium polyphosphate and the cage-shaped phosphate melamine salt are compounded to form the flame-retardant fireproof agent, and the flame-retardant fireproof agent is added into the preparation of the flame-retardant adhesive, so that the flame-retardant adhesive finished product has excellent flame-retardant and fireproof performance. Meanwhile, the flame-retardant adhesive finished product prepared according to the formula disclosed by the invention also has excellent tensile modulus and cohesiveness.

Description

Technical Field

[0001] The invention belongs to the technical field of adhesive making, and in particular relates to a halogen-free and environment-friendly flame-retardant adhesive containing terminal ketoxime siloxane. Background Art

[0002] At present, the flame retardant and fireproof sealants on the domestic market are made by mixing hydroxy-terminated polydimethylsiloxane as the base polymer, halogen flame retardant powder, antimony trioxide, zinc borate, and metal oxides as flame retardants to replace a large amount of nano calcium carbonate as the base material, and then mixed and dispersed with silane crosslinking agent, coupling agent, and catalyst. Such products add a large amount of halogen flame retardant powder. Although the flame retardant and fireproof effect is obvious, halogens are not environmentally friendly and highly toxic. Adding a large amount of zinc borate and metal oxides (aluminum hydroxide, magnesium hydroxide) has a significant flame retardant and fireproof effect, but this type of sealant is inelastic and is basically a plastic colloid, and its tensile modulus and adhesion are poor.

[0003] Therefore, in order to solve the above problems, it is of great practical significance to provide a flame retardant adhesive having excellent flame retardancy, tensile modulus and adhesion. Summary of the invention

[0004] The purpose of the present invention is to provide a terminal ketoxime-based siloxane-based halogen-free environmentally friendly flame retardant adhesive, which solves the problems of poor flame retardancy, tensile modulus and adhesion in the prior art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive, specifically comprising the following raw materials in parts by weight:

[0007] 40-45 parts of hydroxy silicone oil, 3-5 parts of dimethyl silicone oil, 35-45 parts of flame retardant and fireproofing agent, 8-9 parts of fumed silica, 5-7 parts of crosslinking agent, 1-3 parts of coupling agent, 0.3-0.5 parts of chain extender, 0.1-0.3 parts of organic tin catalyst, and 0.01-0.012 parts of end-capping catalyst.

[0008] As a preferred technical solution of the present invention, the viscosity of the hydroxy silicone oil is 50000cp.

[0009] As a preferred technical solution of the present invention, the viscosity grade of the dimethyl silicone oil is 350cst.

[0010] As a preferred technical solution of the present invention, the flame retardant and fireproofing agent includes modified ammonium polyphosphate and caged phosphate melamine salt.

[0011] Furthermore, the mass ratio of the modified ammonium polyphosphate to the caged phosphate melamine salt is 1:1.

[0012] As a preferred technical solution of the present invention, the preparation method of the modified ammonium polyphosphate specifically comprises the following steps:

[0013] S1, dissolving oleic acid in anhydrous ethanol and mixing evenly to obtain an oleic acid ethanol solution;

[0014] S2, controlling the temperature, adding oleic acid ethanol solution to the ammonium polyphosphate, stirring, and obtaining a semi-paste;

[0015] S3. Continue stirring the semi-paste, control the temperature, and evacuate the mixture to completely remove the anhydrous ethanol, thereby obtaining modified ammonium polyphosphate.

[0016] Ammonium polyphosphate has poor compatibility with base polymer hydroxy silicone oil and a low addition amount. The present invention uses oleic acid to modify ammonium polyphosphate, prepares a self-made modified ammonium polyphosphate, improves its compatibility with the base polymer hydroxy silicone oil, increases the amount of modified ammonium polyphosphate that can be added to the system, and is beneficial to improving the flame retardant and fireproofing properties of the system to a certain extent.

[0017] Furthermore, the concentration of the oleic acid ethanol solution in step S1 is 0.1 mol / L.

[0018] Furthermore, the mass ratio of the ammonium polyphosphate to the oleic acid ethanol solution in step S2 is 1:0.2-0.3.

[0019] Furthermore, the temperature control in step S2 is to control the temperature to be less than 60° C.; and the stirring time is 30-40 minutes.

[0020] Furthermore, the temperature of the temperature control in step S3 is 80-85° C.; and the time of the vacuuming is 30-40 minutes.

[0021] As a preferred technical solution of the present invention, the crosslinking agent includes a ketoxime silane crosslinking agent.

[0022] Further, the ketoxime silane crosslinking agent includes at least one of phenyltributylacetoximine silane, methyltributylacetoximine silane and vinyltributylacetoximine silane.

[0023] Preferably, the ketoxime silane crosslinking agent comprises phenyltributylacetoximine silane, methyltributylacetoximine silane and vinyltributylacetoximine silane in equal parts by weight.

[0024] As a preferred technical solution of the present invention, the coupling agent includes at least one of γ-aminopropyltriethoxysilane and γ-glycidyloxypropyltrimethoxysilane.

[0025] As a preferred technical solution of the present invention, the chain extender includes at least one of dimethyldimethoxysilane.

[0026] As a preferred technical solution of the present invention, the organic tin catalyst includes at least one of dibutyltin dilaurate, dibutyltin dioctoate and dibutyltin diacetate.

[0027] As a preferred technical solution of the present invention, the capping catalyst includes dibutyl phosphate.

[0028] A method for preparing a ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive comprises the following steps:

[0029] A1. Place hydroxy silicone oil and dimethyl silicone oil in a kneader while stirring and heating, evacuate, and maintain to obtain base material A. After cooling to room temperature, transfer to a planetary mixer, add a flame retardant and fireproofing agent, mix and stir under vacuum to obtain base material B;

[0030] A2, adding a crosslinking agent and a blocking catalyst to base material B and maintaining a vacuum state of a planetary mixer, controlling the temperature and stirring to obtain base material C;

[0031] A3. Maintaining the vacuum state, add fumed silica to base material C, control the temperature and speed, mix and stir to obtain base material D, add coupling agent and chain extender to base material D, control the temperature and speed, mix and stir to obtain base material E, add organic tin catalyst to base material E, control the temperature and speed, mix and stir to obtain base material F, fill with nitrogen, remove the vacuum treatment, and obtain the finished product of terminal ketoxime siloxane-based halogen-free environmentally friendly flame retardant rubber.

[0032] As a preferred technical solution of the present invention, the temperature is raised to 105-115°C in step A1; the vacuum is -0.095MPa; the holding time is 145-155min; and the stirring time is 30-40min.

[0033] As a preferred technical solution of the present invention, the temperature-controlled stirring in step A2 is to control the temperature to less than 50° C. and stir for 20-30 minutes.

[0034] As a preferred technical solution of the present invention, the temperature-controlled and speed-controlled mixing and stirring in step A3 are: controlling the temperature to less than 50°C, controlling the revolution and rotation speed of the agitator to maintain at 20-30r / min, and mixing and stirring for 25-30min.

[0035] Beneficial effects of the present invention:

[0036] (1) The present invention prepares modified ammonium polyphosphate, improves its compatibility with the base polymer hydroxy silicone oil, increases the amount of modified ammonium polyphosphate that can be added to the system, and is beneficial to the improvement of the flame retardant and fireproofing properties of the system to a certain extent; on this basis, the homemade modified ammonium polyphosphate and caged phosphate melamine salt are compounded to form a flame retardant and fireproofing agent to replace the conventional flame retardants such as halogen, antimony trioxide, and zinc borate. The modified ammonium polyphosphate provides dehydration carbonization and expansion isolation, and the caged phosphate melamine salt forms a porous foam coke layer. The synergistic effect of the two makes the flame retardant and fireproofing agent have excellent flame retardant and fireproofing properties.

[0037] (2) The present invention uses hydroxy silicone oil and flame retardant to remove hydroxyl groups as the base material, and then uses a cross-linking agent and dimethyl silicone oil under the action of a blocking catalyst to prepare a terminal tributyl ketoxime silane-based polydimethylsiloxane basic polymer base rubber, and then uses filler gas phase silica, a coupling agent and a chain extender to prepare a terminal ketoxime siloxane-based halogen-free environmentally friendly flame retardant rubber product. The finished product prepared under the formula of the present invention has excellent tensile modulus, flame retardancy and adhesion. DETAILED DESCRIPTION

[0038] The following will be combined with 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.

[0039] Example 1

[0040] A ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive, specifically comprising the following raw materials in parts by weight:

[0041] 42.5 parts of hydroxy silicone oil, 3 parts of dimethyl silicone oil, 35 parts of flame retardant, 8 parts of fumed silica, 7 parts of crosslinking agent, 1 part of coupling agent, 0.3 parts of chain extender, 0.2 parts of organic tin catalyst, 0.01 parts of end-capping catalyst;

[0042] The viscosity of the hydroxy silicone oil is 50000cp, and the viscosity grade of the dimethyl silicone oil is 350cst; the flame retardant and fireproofing agent includes modified ammonium polyphosphate and caged phosphate melamine salt in equal weight; the cross-linking agent includes phenyl trisbutyl ketone oxime silane; the coupling agent includes γ-aminopropyl triethoxysilane; the chain extender includes dimethyl dimethoxy silane; the organic tin catalyst includes dibutyl tin diacetate; and the end-capping catalyst includes dibutyl phosphate.

[0043] The preparation method of the modified ammonium polyphosphate specifically comprises the following steps:

[0044] S1, dissolving oleic acid in anhydrous ethanol and mixing evenly to obtain an oleic acid ethanol solution with a concentration of 0.1 mol / L;

[0045] S2, adding oleic acid ethanol solution to ammonium polyphosphate at a temperature of 56°C and stirring for 35 minutes to obtain a semi-paste;

[0046] The mass ratio of the ammonium polyphosphate to the oleic acid ethanol solution is 1:0.3;

[0047] S3. Continue stirring the semi-paste, control the temperature at 80°C, and evacuate for 30 minutes to completely remove the anhydrous ethanol to obtain modified ammonium polyphosphate.

[0048] A method for preparing a ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive comprises the following steps:

[0049] A1. Place hydroxy silicone oil and dimethyl silicone oil in a kneader while stirring and heating to 105°C, evacuate to -0.095MPa, and maintain for 145 minutes to obtain base material A. After cooling to room temperature, transfer to a planetary mixer, add a flame retardant, and mix and stir under vacuum for 30 minutes to obtain base material B.

[0050] A2, add the crosslinking agent and the end-capping catalyst to the base material B and keep the planetary mixer in a vacuum state, control the temperature at 40°C and stir for 20 minutes to obtain the base material C;

[0051] A3. Maintaining the vacuum state, add fumed silica to base material C, control the temperature to 46°C, control the revolution and rotation speed of the agitator to maintain at 20 r / min, and mix and stir for 25 minutes to obtain base material D. Add coupling agent and chain extender to base material D, control the temperature to 40°C, control the speed to 25 r / min, and mix and stir for 30 minutes to obtain base material E. Add organic tin catalyst to base material E, control the temperature to 43°C, control the speed to 30 r / min, and mix and stir for 27.5 minutes to obtain base material F. Fill with nitrogen, remove the vacuum treatment, and obtain the finished product of terminal ketoxime-based siloxane-based halogen-free environmentally friendly flame retardant rubber.

[0052] Example 2

[0053] A ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive, specifically comprising the following raw materials in parts by weight:

[0054] 40 parts of hydroxy silicone oil, 5 parts of dimethyl silicone oil, 40 parts of flame retardant and fireproofing agent, 8.5 parts of fumed silica, 5 parts of crosslinking agent, 3 parts of coupling agent, 0.5 parts of chain extender, 0.3 parts of organic tin catalyst, 0.011 parts of end-capping catalyst;

[0055] The viscosity of the hydroxy silicone oil is 50000cp, and the viscosity grade of the dimethyl silicone oil is 350cst; the flame retardant and fireproofing agent comprises modified ammonium polyphosphate and caged phosphate melamine salt in equal weight; the cross-linking agent comprises phenyltributylacetonato silane and methyltributylacetonato silane in equal weight parts, that is, phenyltributylacetonato silane and methyltributylacetonato silane are both 2.5 parts; the coupling agent comprises γ-glycidyloxypropyltrimethoxysilane; the chain extender comprises dimethyldimethoxysilane; the organic tin catalyst comprises dibutyltin dilaurate; and the end-capping catalyst comprises dibutyl phosphate.

[0056] The preparation method of the modified ammonium polyphosphate specifically comprises the following steps:

[0057] S1, dissolving oleic acid in anhydrous ethanol and mixing evenly to obtain an oleic acid ethanol solution with a concentration of 0.1 mol / L;

[0058] S2, adding oleic acid ethanol solution to ammonium polyphosphate at a temperature of 60°C and stirring for 30 minutes to obtain a semi-paste;

[0059] The mass ratio of the ammonium polyphosphate to the oleic acid ethanol solution is 1:0.25;

[0060] S3. Continue stirring the semi-paste, control the temperature to 85°C, and evacuate for 40 minutes to completely remove the anhydrous ethanol to obtain modified ammonium polyphosphate.

[0061] A method for preparing a ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive comprises the following steps:

[0062] A1. Place hydroxy silicone oil and dimethyl silicone oil in a kneader while stirring and heating to 115°C, evacuate to -0.095MPa, and maintain for 155min to obtain base material A. After cooling to room temperature, transfer to a planetary mixer, add a flame retardant, and mix and stir under vacuum for 40min to obtain base material B.

[0063] A2, add the crosslinking agent and the end-capping catalyst to the base material B and keep the planetary mixer in a vacuum state, control the temperature at 45°C and stir for 30 minutes to obtain the base material C;

[0064] A3. Maintaining the vacuum state, add fumed silica to base material C, control the temperature to 44°C, control the revolution and rotation speed of the agitator to maintain at 25 r / min, and mix and stir for 30 minutes to obtain base material D. Add coupling agent and chain extender to base material D, control the temperature to 45°C, control the speed to 20 r / min, and mix and stir for 25 minutes to obtain base material E. Add organic tin catalyst to base material E, control the temperature to 46°C, control the speed to 20 r / min, and mix and stir for 25 minutes to obtain base material F. Fill with nitrogen, remove the vacuum treatment, and obtain the finished product of terminal ketoxime-based siloxane-based halogen-free environmentally friendly flame retardant rubber.

[0065] Example 3

[0066] A ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive, specifically comprising the following raw materials in parts by weight:

[0067] 45 parts of hydroxy silicone oil, 4 parts of dimethyl silicone oil, 45 parts of flame retardant and fireproofing agent, 9 parts of fumed silica, 6 parts of crosslinking agent, 2 parts of coupling agent, 0.4 parts of chain extender, 0.1 parts of organic tin catalyst, 0.012 parts of end-capping catalyst;

[0068] The viscosity of the hydroxy silicone oil is 50000cp, and the viscosity grade of the dimethyl silicone oil is 350cst; the flame retardant and fireproofing agent comprises modified ammonium polyphosphate and caged phosphate melamine salt in equal weight; the cross-linking agent comprises phenyltributylacetonato silane, methyltributylacetonato silane and vinyltributylacetonato silane in equal weight parts, that is, phenyltributylacetonato silane, methyltributylacetonato silane and vinyltributylacetonato silane are all 2 parts; the coupling agent comprises γ-aminopropyltriethoxysilane; the chain extender comprises dimethyldimethoxysilane; the organic tin catalyst comprises dibutyltin dioctoate; and the end-capping catalyst comprises dibutyl phosphate.

[0069] The preparation method of the modified ammonium polyphosphate specifically comprises the following steps:

[0070] S1, dissolving oleic acid in anhydrous ethanol and mixing evenly to obtain an oleic acid ethanol solution with a concentration of 0.1 mol / L;

[0071] S2, adding oleic acid ethanol solution to ammonium polyphosphate at a temperature of 58°C and stirring for 40 minutes to obtain a semi-paste;

[0072] The mass ratio of the ammonium polyphosphate to the oleic acid ethanol solution is 1:0.2;

[0073] S3. Continue stirring the semi-paste, control the temperature to 82.5°C, and evacuate for 35 minutes to completely remove the anhydrous ethanol to obtain modified ammonium polyphosphate.

[0074] A method for preparing a ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive comprises the following steps:

[0075] A1. Place hydroxy silicone oil and dimethyl silicone oil in a kneader while stirring and heating to 110°C, evacuate to -0.095MPa, and maintain for 150min to obtain base material A. After cooling to room temperature, transfer to a planetary mixer, add a flame retardant, and mix and stir for 35min under vacuum to obtain base material B.

[0076] A2, add the crosslinking agent and the end-capping catalyst to the base material B and keep the planetary mixer in a vacuum state, control the temperature at 49°C and stir for 25 minutes to obtain the base material C;

[0077] A3. Maintaining the vacuum state, add fumed silica to base material C, control the temperature to 48°C, control the revolution and rotation speed of the agitator to maintain at 30 r / min, mix and stir for 27.5 min to obtain base material D. Add coupling agent and chain extender to base material D, control the temperature to 49°C, control the speed to 30 r / min, mix and stir for 27.5 min to obtain base material E. Add organic tin catalyst to base material E, control the temperature to 48°C, control the speed to 25 r / min, mix and stir for 30 min to obtain base material F. Fill with nitrogen, remove the vacuum treatment, and obtain the finished product of terminal ketoxime siloxane halogen-free environmentally friendly flame retardant rubber.

[0078] Comparative Example 1

[0079] Compared with Example 3, the difference is that in Comparative Example 1, the ammonium polyphosphate is not modified, that is, ammonium polyphosphate is used instead of modified ammonium polyphosphate, and the other operating steps and parameters remain unchanged.

[0080] Comparative Example 2

[0081] Compared with Example 3, the difference is that in Comparative Example 2, modified ammonium polyphosphate is not added, and an equal mass of caged phosphate ester melamine salt is used instead, and the other operating steps and parameters remain unchanged.

[0082] Comparative Example 3

[0083] Compared with Example 3, the difference is that in Comparative Example 3, caged phosphate ester melamine salt is not added, and modified ammonium polyphosphate of equal mass is used instead, and the other operating steps and parameters remain unchanged.

[0084] Comparative Example 4

[0085] Compared with Example 3, the difference is that in Comparative Example 4, the flame retardant and fire retardant is 34 parts, and the flame retardant and fire retardant includes modified ammonium polyphosphate and caged phosphate melamine salt in equal weight; the other operating steps and parameters remain unchanged.

[0086] Comparative Example 5

[0087] Compared with Example 3, the difference is that in Comparative Example 5, the flame retardant and fire retardant is 46 parts, and the flame retardant and fire retardant includes modified ammonium polyphosphate and caged phosphate melamine salt in equal weight; the other operating steps and parameters remain unchanged.

[0088] Comparative Example 6

[0089] Compared with Example 3, the difference is that in Comparative Example 6, the flame retardant and fire retardant is 45 parts, and the flame retardant and fire retardant includes modified ammonium polyphosphate and caged phosphate melamine salt in a mass ratio of 3:1; the other operating steps and parameters remain unchanged.

[0090] Comparative Example 7

[0091] Compared with Example 3, the difference is that in Comparative Example 7, the flame retardant and fire retardant is 45 parts, and the flame retardant and fire retardant includes modified ammonium polyphosphate and caged phosphate melamine salt in a mass ratio of 2:1; the other operating steps and parameters remain unchanged.

[0092] Comparative Example 8

[0093] Compared with Example 3, the difference is that in Comparative Example 8, the flame retardant and fire retardant is 45 parts, and the flame retardant and fire retardant includes modified ammonium polyphosphate and caged phosphate melamine salt in a mass ratio of 1:2; the other operating steps and parameters remain unchanged.

[0094] Comparative Example 9

[0095] Compared with Example 3, the difference is that in Comparative Example 9, the flame retardant and fire retardant is 45 parts, and the flame retardant and fire retardant includes modified ammonium polyphosphate and caged phosphate melamine salt in a mass ratio of 1:3; the other operating steps and parameters remain unchanged.

[0096] Comparative Example 10

[0097] Compared with Example 3, the difference is that the flame retardant and fireproofing agent in Comparative Example 10 includes nano calcium carbonate and aluminum hydroxide in a mass ratio of 5:7, and the other operating steps and parameters remain unchanged.

[0098] Comparative Example 11

[0099] Compared with Example 3, the difference is that the flame retardant and fireproofing agent in Comparative Example 11 includes nano-calcium carbonate, antimony trioxide and decabromodiphenyl ether in a mass ratio of 6:2:1, and the other operating steps and parameters remain unchanged.

[0100] Performance Testing

[0101] According to GB / T 24267-2009, the finished products obtained in Examples 1-3 and Comparative Examples 1-11 were subjected to the following performance tests after curing for 21 days under a standard test environment at 23°C and a relative humidity of 50%:

[0102] (1) The finished products obtained in Examples 1-3 and Comparative Examples 1-11 were tested for flame retardancy according to GB / T 2408-2008. The flame retardancy grades that meet the requirements of FV-0 are marked with √, and the flame retardancy grades that do not meet the requirements of FV-0 are marked with ×. The results are shown in Table 1.

[0103] (2) The finished products obtained in Examples 1-3 were tested for tensile modulus (Mpa), and the results are shown in Table 2;

[0104] (3) The finished products obtained in Examples 1-3 were subjected to a tensile displacement capacity test to confirm whether they met the displacement capacity ±25% required by the GB / T24267-2009 standard. The results are shown in Table 2.

[0105] Table 1

[0106]

[0107]

[0108] Table 2

[0109]

[0110] It can be seen from Table 1 that the terminal ketoxime siloxane-based halogen-free environmentally friendly flame retardant adhesive product prepared under the ratio of the modified ammonium polyphosphate and the caged phosphate melamine salt of the present invention has excellent flame retardant and fireproof properties;

[0111] As can be seen from Table 2, the terminal ketoxime siloxane-based halogen-free environmentally friendly flame retardant adhesive product prepared in the present invention has excellent tensile modulus and adhesion.

[0112] In the description of the specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0113] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A halogen-free, environment-friendly flame-retardant adhesive containing ketoxime-terminated siloxane, characterized in that: Specifically include the following raw materials by weight: 40-45 parts of hydroxy silicone oil, 3-5 parts of dimethyl silicone oil, 35-45 parts of flame retardant and fireproofing agent, 8-9 parts of fumed silica, 5-7 parts of crosslinking agent, 1-3 parts of coupling agent, 0.3-0.5 parts of chain extender, 0.1-0.3 parts of organic tin catalyst, and 0.01-0.012 parts of end-capping catalyst.

2. The ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive according to claim 1, characterized in that: The viscosity of the hydroxy silicone oil is 50000cp, and the viscosity grade of the dimethyl silicone oil is 350cst.

3. The ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive according to claim 1, characterized in that: The flame retardant and fireproofing agent comprises modified ammonium polyphosphate and caged phosphate melamine salt in a mass ratio of 1:

1.

4. The ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive according to claim 3, characterized in that: The preparation method of the modified ammonium polyphosphate specifically comprises the following steps: S1, dissolving oleic acid in anhydrous ethanol and mixing evenly to obtain an oleic acid ethanol solution; S2, controlling the temperature, adding oleic acid ethanol solution to the ammonium polyphosphate, stirring, and obtaining a semi-paste; S3. Continue stirring the semi-paste, control the temperature, and evacuate the mixture to completely remove the anhydrous ethanol, thereby obtaining modified ammonium polyphosphate.

5. The ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive according to claim 4, characterized in that: The concentration of the oleic acid ethanol solution in step S1 is 0.1 mol / L; the mass ratio of the ammonium polyphosphate to the oleic acid ethanol solution in step S2 is 1:0.2-0.

3.

6. The ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive according to claim 1, characterized in that: The crosslinking agent includes a ketoxime silane crosslinking agent; the ketoxime silane crosslinking agent includes at least one of phenyltributylacetoximosilane, methyltributylacetoximosilane and vinyltributylacetoximosilane.

7. The ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive according to claim 1, characterized in that: The coupling agent includes at least one of γ-aminopropyltriethoxysilane and γ-glycidyloxypropyltrimethoxysilane.

8. The ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive according to claim 1, characterized in that: The chain extender includes at least one of dimethyldimethoxysilane.

9. The ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive according to claim 1, characterized in that: The organic tin catalyst includes at least one of dibutyltin dilaurate, dibutyltin dioctoate and dibutyltin diacetate; and the capping catalyst includes dibutyl phosphate.

10. A method for preparing the ketoxime-terminated siloxane-based halogen-free environmentally friendly flame retardant adhesive according to any one of claims 1 to 9, characterized in that: The specific steps include: A1. Place hydroxy silicone oil and dimethyl silicone oil in a kneader while stirring and heating, evacuate, and maintain to obtain base material A. After cooling to room temperature, transfer to a planetary mixer, add a flame retardant and fireproofing agent, mix and stir under vacuum to obtain base material B; A2, adding a crosslinking agent and a blocking catalyst to base material B and maintaining a vacuum state of a planetary mixer, controlling the temperature and stirring to obtain base material C; A3. Maintaining the vacuum state, add fumed silica to base material C, control the temperature and speed, mix and stir to obtain base material D, add coupling agent and chain extender to base material D, control the temperature and speed, mix and stir to obtain base material E, add organic tin catalyst to base material E, control the temperature and speed, mix and stir to obtain base material F, fill with nitrogen, remove the vacuum treatment, and obtain the finished product of terminal ketoxime siloxane-based halogen-free environmentally friendly flame retardant rubber.

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