White high-flame-retardant silica gel buffer material and preparation method thereof

Abstract

The invention discloses a white high-flame-retardant silica gel buffer material and a preparation method thereof, and the white high-flame-retardant silica gel buffer material comprises the following raw materials by mass: 25-50% of raw silicone rubber; 2-5% of a structured control agent; 3-20% of a reinforcing filling system; 20-40% of a phosphorus flame retardant system; 5-25% of a nitrogen-containing flame retardant system; the materials are subjected to banburying and kneading through a preset process and thermal vacuum treatment to obtain a rubber compound. The prepared silica gel buffer material is pure white, the flame retardant property can reach the UL-941 mmV-0 grade, the preparation process is simple, environment-friendly and halogen-free, extrusion continuous production can be achieved, and the silica gel buffer material is suitable for the fields of new energy batteries, fire prevention, flame retardance and the like.

Description

Technical Field

[0001] The invention relates to the technical field of flame-retardant silicone rubber, in particular to a white highly flame-retardant silicone cushioning material and a preparation method thereof. Background Art

[0002] With the rapid development of the domestic new energy vehicle industry, the demand for driving range continues to increase, and the energy density of battery packs is getting higher and higher, which will bring more safety hazards. It is very meaningful to provide safety protection for new energy battery packs to protect them from potential dangers such as impact, stabbing, falling, and fire, thereby protecting the safety of the entire vehicle and the people inside the vehicle.

[0003] Silicone rubber has been widely used in the field of new energy due to its excellent thermal stability, electrical insulation and buffering properties. However, silicone rubber has poor flame retardancy and will continue to burn once ignited. At present, the more common practice is to add flame retardants to silicone to improve the flame retardancy. Compared with dark-colored silicone products, the high flame retardancy of pure white silicone products is more difficult to achieve. Due to color restrictions, the range of flame retardants available is small and limited: traditional halogen flame retardants are not suitable for the field of new energy due to smoke density and smoke toxicity problems during combustion; inorganic flame retardants (such as aluminum hydroxide and magnesium hydroxide) are safe, environmentally friendly and low-cost, but have low flame retardant efficiency and often require a large amount of addition to achieve a flame retardant effect, which cannot meet higher flame retardant requirements; phosphorus nitrogen flame retardants have good flame retardant effects, but the cost is high, and as the amount of addition gradually increases, the processability of the material gradually deteriorates, which is not conducive to extrusion continuous production. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the object of the present invention is to provide a white highly flame-retardant silica gel cushioning material and a preparation method thereof, so as to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose, the present invention is implemented by the following technical solutions:

[0006] The present invention provides a white high flame retardant silica gel cushioning material, wherein the white high flame retardant silica gel cushioning material comprises the following raw materials in terms of mass percentage:

[0007] Silicone rubber 25-50%;

[0008] Structural control agent 2-5%;

[0009] Reinforcement filling system 3-20%;

[0010] Phosphorus flame retardant system 20-40%;

[0011] Nitrogen-containing flame retardant system 5-25%;

[0012] The molecular weight of the silicone rubber is 500,000-900,000, and the vinyl content is 0.1%-3%.

[0013] The present invention also provides a method for preparing a white highly flame-retardant silica gel buffer material, the preparation method comprising the following steps:

[0014] S1: adding silicone rubber raw rubber, structural control agent, reinforcing filling system, phosphorus flame retardant system and nitrogen flame retardant system into a kneader, kneading and forming, and then performing vacuum heat treatment to obtain a mixed rubber material;

[0015] S2: adding the mixed rubber material and curing agent obtained in S1 to a double-roll mill in sequence for mixing to obtain a silicone rubber mixed rubber;

[0016] S3: The silicone rubber compound obtained in S2 is added into an extruder to realize continuous extrusion. After extrusion, the silicone rubber is quickly vulcanized through a drying oven to obtain a white highly flame-retardant silicone cushioning material.

[0017] The present invention also provides the application of the white highly flame-retardant silicone cushioning material mentioned above in the present invention and / or the white highly flame-retardant silicone cushioning material prepared by the above-mentioned preparation method of the present invention in the fields of new energy, fire prevention and flame retardancy.

[0018] Compared with the prior art, the present invention provides a white highly flame-retardant silica gel cushioning material and a preparation method thereof, which has the following beneficial effects:

[0019] 1. The prepared white highly flame-retardant silicone cushioning material is widely used in new energy batteries, fire prevention, flame retardancy and other fields;

[0020] 2. The prepared white highly flame-retardant silicone cushioning material ensures that the material color is pure white while greatly improving the flame retardant properties of the rubber. The main phosphorus-nitrogen compound flame retardant system is added to the silicone product at a ratio of 20% to 40%. While ensuring the stability of the material extrusion processing, the flame retardant level of the sample with a thickness of 1.0 mm that was originally unqualified can be increased to UL94V-0.

[0021] 3. The preparation method is simple and easy to apply in continuous production. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a photo of the mixed rubber of the common flame retardant silicone material of Comparative Example 1 of the present invention.

[0023] Figure 2 This is a photo of the white highly flame-retardant silicone cushioning material of Example 1 of the present invention.

[0024] Figure 3 This is a photograph of the white highly flame-retardant silica gel cushioning material in Example 3 of the present invention during combustion. DETAILED DESCRIPTION

[0025] Hereinafter, the embodiments of the white highly flame-retardant silica gel cushioning material and the preparation method provided by the present invention are described in detail.

[0026] The "range" disclosed in the present application is defined in the form of a lower limit and an upper limit, and a given range is defined by selecting a lower limit and an upper limit, and the selected lower limit and upper limit define the boundaries of the particular range. The range defined in this way can be inclusive or exclusive of the end values, and can be arbitrarily combined, that is, any lower limit can be combined with any upper limit to form a range. For example, if a range of 60 to 120 and 80 to 110 is listed for a particular parameter, it is understood that a range of 60 to 110 and 80 to 120 is also expected. In addition, if the minimum range values ​​1 and 2 are listed, and if the maximum range values ​​3, 4 and 5 are listed, the following ranges can all be expected: 1 to 3, 1 to 4, 1 to 5, 2 to 3, 2 to 4 and 2 to 5. In the present application, unless otherwise specified, the numerical range "a to b" represents an abbreviation of any real number combination between a and b, where a and b are both real numbers. For example, the numerical range "0-5" means that all real numbers between "0-5" are listed in this document, and "0-5" is just an abbreviation of these numerical combinations. In addition, when a parameter is expressed as an integer ≥ 2, it is equivalent to disclosing that the parameter is, for example, an integer of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, etc.

[0027] After extensive research and exploration, the inventors of the present invention have rationally adjusted the formula, taking into account flame retardancy, cost and processability, and preferably formulated and used a phosphorus-nitrogen synergistic flame retardant system. This system can reduce the high cost of phosphorus-based flame retardants, the low flame retardant efficiency of nitrogen-based flame retardants, and the adverse effects of large additions affecting processability; at the same time, phosphorus and nitrogen elements can play a flame retardant role respectively and promote each other. Phosphorus-based flame retardants will decompose into polyphosphoric acid and partial polyphosphoric acid when heated, prompting the substrate to quickly dehydrate and carbonize, and play a condensed phase flame retardant role; nitrogen-based flame retardants will thermally decompose to generate NH 3 、N 2 The flame-retardant gas can dilute the oxygen concentration and exert a gas-phase flame retardant effect; when escaping, the flame-retardant gas can act on the carbon layer generated by organic phosphorus and increase its area, exerting a synergistic effect between the condensed phase and the gas phase. On this basis, a white highly flame-retardant silicone cushioning material is obtained. The silicone cushioning material is pure white, and its flame retardant performance can reach UL-94 1mmV-0 level. The preparation process is simple, environmentally friendly and halogen-free. It can be extruded for continuous production and is suitable for new energy batteries, fire prevention, flame retardancy and other fields. On the basis of the above, this application is completed.

[0028]

White highly flame retardant silicone cushioning material

[0029] The invention provides a white highly flame-retardant silicone cushioning material, wherein the raw materials of the white highly flame-retardant silicone cushioning material include silicone rubber raw rubber, a structural control agent, a reinforcing filling system, a phosphorus-based flame-retardant system, and a nitrogen-containing flame-retardant system.

[0030] The white high flame retardant silicone cushion material provided by the present invention includes 25-50% of silicone rubber raw rubber by mass percentage of the white high flame retardant silicone cushion material. Optionally, the mass percentage of silicone rubber raw rubber is 25-40%, 40-45%, 25-35%, 35-45%, 25-30%, 30-35%, 35-40%, 40-45%, 45-50%, etc. Within the above range, the amount of rubber filler is moderate and the processability is good. If the amount of filler exceeds the range, the processability of silicone will be affected.

[0031] Furthermore, the molecular weight of the silicone rubber is 500,000-900,000, and can be 500,000-700,000, 700,000-900,000, 500,000-600,000, 600,000-700,000, 700,000-800,000, or 800,000-900,000.

[0032] Furthermore, the vinyl content of the silicone rubber is 0.1%-3%, and can be optionally 0.1%-1%, 1%-3%, 1%-2% or 2%-3%.

[0033] Furthermore, the silicone rubber raw rubber is selected from methyl vinyl silicone rubber raw rubber, and the vinyl content is 1%-3%, which can be 1%-2% or 2%-3%. The molecular weight is 500,000-900,000. It can be 500,000-700,000, 700,000-900,000, 500,000-600,000, 600,000-700,000, 700,000-800,000 or 800,000-900,000. The rubber within the above range has moderate plasticity and good processability. If the molecular weight of the raw rubber exceeds the range, it will affect the processability of the silicone.

[0034] The white highly flame-retardant silica gel cushion material provided by the present invention includes 2-5% of a structuring control agent by mass percentage of the white highly flame-retardant silica gel cushion material. Optionally, the mass percentage of the structuring control agent is 2-4%, 4-5%, 2-3% or 3-5%. The rubber material within the above range has stable performance and good processability, and can effectively inhibit the physical adsorption and chemical bonding of raw rubber molecules to white carbon black to avoid structuring of the rubber material. If the structuring control agent is used beyond this range, the mechanical properties and processability of the rubber material will be affected.

[0035] Furthermore, the structuring control agent is selected from one or more mixtures of hydroxy silicone oil, hydroxy vinyl silicone oil, methoxy silicone oil, hydrogen-containing silicone oil, phenyl silicone oil coupling agent 171, coupling agent 172, coupling agent 151, etc.

[0036] The white high flame retardant silicone cushion material provided by the present invention includes 3-20% of a reinforcing filling system by mass percentage of the white high flame retardant silicone cushion material. Optionally, the mass percentage of the reinforcing filling system is 3-10%, 10-20%, 3-5%, 5-10%, 10-15% or 15-20%. The rubber within the above range has excellent mechanical properties and good processability, while the rubber outside the range has insufficient mechanical properties or is too hard, which affects processing.

[0037] Furthermore, the reinforcing filling system is selected from one or more of precipitated silica, fumed silica, and the like.

[0038] The white high flame retardant silica gel cushion material provided by the present invention comprises 20-40% of phosphorus flame retardant system by mass percentage of the white high flame retardant silica gel cushion material. Optionally, the mass percentage of the phosphorus flame retardant system is 20-30%, 30-40%, 20-25%, 25-35% or 25-40%. Within the above range, the flame retardant performance is excellent and the cost is acceptable. Outside the range, the flame retardant performance is poor or the cost is high.

[0039] Further, the phosphorus-based flame retardant system is a phosphorus-containing flame retardant. Optionally, the phosphorus-based flame retardant system is selected from two or three of tricresyl phosphate, triisopropylphenyl phosphate, ammonium polyphosphate, diethylaluminum phosphinate, dialkylaluminum phosphinate, etc. Further optionally, the phosphorus-based flame retardant system is selected from a combination of ammonium polyphosphate and diethylaluminum phosphinate, or a combination of ammonium polyphosphate and tricresyl phosphate, or diethylaluminum phosphinate. The mass ratio of ammonium polyphosphate to diethylaluminum phosphinate is 2:1. The mass ratio of ammonium polyphosphate to tricresyl phosphate is 1:2.

[0040] The white highly flame-retardant silicone cushion material provided by the present invention includes 5-25% of a nitrogen-containing flame retardant system by mass percentage of the white highly flame-retardant silicone cushion material. Optionally, the mass percentage of the nitrogen-containing flame retardant system is 5-10%, 10-20%, 10-15% or 15-25%. Within the above range, the synergistic flame retardant effect with the phosphorus flame retardant is better, and the flame retardant effect outside the range is relatively general or may affect the processability.

[0041] Furthermore, the nitrogen-containing flame retardant system is one or more of melamine, dicyandiamide, melamine phosphate and the like.

[0042] In some embodiments, the white highly flame-retardant silica gel cushioning material comprises the following raw materials by mass percentage:

[0043] Silicone rubber 25-50%;

[0044] Structural control agent 2-5%;

[0045] Reinforcement filling system 3-20%;

[0046] Phosphorus flame retardant system 20-40%;

[0047] Nitrogen-containing flame retardant system 5-25%;

[0048] The molecular weight of the silicone rubber is 500,000-900,000, and the vinyl content is 0.1%-3%.

[0049]

Preparation method of white highly flame-retardant silicone cushioning material

[0050] The present invention also provides a method for preparing a white highly flame-retardant silica gel buffer material, the preparation method comprising the following steps:

[0051] S1: adding silicone rubber raw rubber, structural control agent, reinforcing filling system, phosphorus flame retardant system and nitrogen flame retardant system into a kneader, kneading and forming, and then performing vacuum heat treatment to obtain a mixed rubber material;

[0052] S2: adding the mixed rubber material and curing agent obtained in S1 to a double-roll mill in sequence for mixing to obtain a silicone rubber mixed rubber;

[0053] S3: The silicone rubber compound obtained in S2 is added into an extruder to realize continuous extrusion. After extrusion, the silicone rubber is quickly vulcanized through a drying oven to obtain a white highly flame-retardant silicone cushioning material.

[0054] In step S1 of the present invention, the silicone rubber raw rubber, the structural control agent, the reinforcing filling system, the phosphorus-based flame retardant system and the nitrogen-containing flame retardant system are first weighed according to the weight percentages described in the first aspect of the present invention.

[0055] In step S1 of the present invention, the initial temperature of the banburying is 20-40°C and the rotation speed is 35-45r / min. Further, the initial temperature of the banburying can be selected to be 20-30°C or 30-40°C. The rotation speed can be selected to be 35-40r / min or 40-45r / min.

[0056] In step S1 of the present invention, the vacuum heat treatment temperature is 60-120° C., the vacuum degree is -0.1 MPa, and the vacuum heat treatment time is 60-120 minutes. Optionally, the vacuum heat treatment temperature can be, for example, 60-80° C., 80-100° C., or 100-120° C. The vacuum heat treatment time can be, for example, 60-80 minutes, 80-100 minutes, or 100-120 minutes.

[0057] In step S2 of the present invention, the curing agent is 2,4-dichlorobenzoyl peroxide.

[0058] In step S2 of the present invention, the mixing time is 120-180 minutes, and can be 120-150 minutes or 150-180 minutes.

[0059] In step S3) of the present invention, the extruder extrusion speed is 5-80 rpm, and can be 5-40 rpm or 40-80 rpm.

[0060] In step S3) of the present invention, the drying oven temperature is 160-240°C, and can be 160-200°C or 200-240°C.

[0061]

use

[0062] The present invention also provides the application of the white highly flame-retardant silicone cushioning material described in the first aspect of the present invention and / or the white highly flame-retardant silicone cushioning material prepared by the preparation method described in the second aspect of the present invention in the fields of new energy, fire prevention and flame retardancy.

[0063] The beneficial effects of the present invention are further illustrated below in conjunction with embodiments.

[0064] In order to make the invention purpose, technical scheme and beneficial technical effect of the present invention clearer, the present invention is further described in detail below in conjunction with examples. However, it should be understood that the examples of the present invention are only for explaining the present invention, not for limiting the present invention, and the examples of the present invention are not limited to the examples given in the specification. The specific experimental conditions or operating conditions not specified in the examples are made under conventional conditions, or are made under the conditions recommended by the material supplier.

[0065] In addition, it should be understood that one or more method steps mentioned in the present invention do not exclude the existence of other method steps before or after the combination step or the insertion of other method steps between these explicitly mentioned steps, unless otherwise specified; it should also be understood that the combination connection relationship between one or more devices / apparatuses mentioned in the present invention does not exclude the existence of other devices / apparatuses before or after the combination device / apparatus or the insertion of other devices / apparatuses between these explicitly mentioned two devices / apparatuses, unless otherwise specified. Moreover, unless otherwise specified, the numbering of each method step is only a convenient tool for identifying each method step, and is not intended to limit the order of arrangement of each method step or the scope of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the present invention without substantially changing the technical content.

[0066] In the following examples, unless otherwise specified, various raw materials of the present invention can be purchased from the market or prepared according to conventional methods in the art.

[0067] Methyl vinyl silicone rubber, molecular weight 900,000, vinyl content 0.16%, Hesheng Silicon Industry Co., Ltd., model 110-2;

[0068] Hydroxy silicone oil, Shandong Longhui Chemical Co., Ltd.

[0069] Ammonium polyphosphate, Shouguang Puer Chemical Co., Ltd., AP710.

[0070] Melamine, Zhejiang Xusen Flame Retardant Co., Ltd., XS-MC-15.

[0071] Comparative Example 1

[0072] This comparative example provides a method for making ordinary silicone rubber, which has the following raw material compositions in parts by weight:

[0073] 100 parts by weight of methyl vinyl silicone rubber, 900,000 molecular weight, 0.16% vinyl content;

[0074] 20 parts by weight of precipitated silica;

[0075] 5 parts by weight of hydroxy silicone oil;

[0076] 90 parts by weight of melamine;

[0077] The above material preparation method comprises the following steps:

[0078] (1) The above raw materials were kneaded and mixed uniformly in an internal mixer, the initial temperature of the internal mixer was 20°C, the speed was 45r / min, and the kneading time was 180 minutes;

[0079] (2) subjecting the mixed rubber material to vacuum heat treatment at a temperature of 120°C for 60 min;

[0080] (3) After the rubber mix is ​​cooled, 1% of the vulcanizing agent 2,4-dichlorobenzoyl peroxide is added using a two-roll mill;

[0081] (4) After the rubber material is uniformly mixed, it is added to an extruder for continuous extrusion with an extrusion thickness of 1 mm and 2 mm, a drying oven temperature of 200° C., and a time of 5 min. After complete vulcanization, a common flame-retardant silicone material is obtained.

[0082] Comparative Example 2

[0083] This comparative example provides a method for making ordinary flame retardant silicone rubber, which has the following raw material compositions in parts by weight:

[0084] 100 parts by weight of methyl vinyl silicone rubber, 900,000 molecular weight, 0.16% vinyl content;

[0085] 20 parts by weight of precipitated silica;

[0086] 5 parts by weight of hydroxy silicone oil;

[0087] 30 parts by weight of aluminum diethylphosphinate;

[0088] 60 parts by weight of melamine;

[0089] The above material preparation method comprises the following steps:

[0090] (1) The above raw materials were kneaded and mixed uniformly in an internal mixer, the initial temperature of the internal mixer was 20°C, the speed was 45r / min, and the kneading time was 180 minutes;

[0091] (2) subjecting the mixed rubber material to vacuum heat treatment at a temperature of 120°C for 60 min;

[0092] (3) After the rubber mix is ​​cooled, 1% of the vulcanizing agent 2,4-dichlorobenzoyl peroxide is added using a two-roll mill;

[0093] (4) After the rubber material is uniformly mixed, it is added to an extruder for continuous extrusion with an extrusion thickness of 1 mm and 2 mm, a drying oven temperature of 200° C., and a time of 5 min. After complete vulcanization, a common flame-retardant silicone material is obtained.

[0094] Comparative Example 3

[0095] This comparative example provides a method for making ordinary flame retardant silicone rubber, which has the following raw material compositions in parts by weight:

[0096] 100 parts by weight of methyl vinyl silicone rubber, 900,000 molecular weight, 0.16% vinyl content;

[0097] 20 parts by weight of precipitated silica;

[0098] 5 parts by weight of hydroxy silicone oil;

[0099] 30 parts by weight of aluminum diethylphosphinate;

[0100] 30 parts by weight of melamine;

[0101] 30 parts by weight of melamine polyphosphate;

[0102] The above material preparation method comprises the following steps:

[0103] (1) The above raw materials were kneaded and mixed uniformly in an internal mixer, the initial temperature of the internal mixer was 20°C, the speed was 45r / min, and the kneading time was 180 minutes;

[0104] (2) subjecting the mixed rubber material to vacuum heat treatment at a temperature of 120°C for 60 min;

[0105] (3) After the rubber mix is ​​cooled, 1% of the vulcanizing agent 2,4-dichlorobenzoyl peroxide is added using a two-roll mill;

[0106] (4) After the rubber material is uniformly mixed, it is added to an extruder for continuous extrusion with an extrusion thickness of 1 mm and 2 mm, a drying oven temperature of 200° C., and a time of 5 min. After complete vulcanization, a common flame-retardant silicone material is obtained.

[0107] Among them, the mixed rubber photo of the common flame retardant silicone material of Comparative Example 1 is as follows Figure 1 shown.

[0108] Example 1

[0109] This embodiment provides a white highly flame-retardant silica gel cushioning material for new energy, which is made of the following raw materials in parts by weight:

[0110] 100 parts by weight of methyl vinyl silicone rubber, 900,000 molecular weight, 0.16% vinyl content;

[0111] 20 parts by weight of precipitated silica;

[0112] 5 parts by weight of hydroxy silicone oil;

[0113] 60 parts by weight of aluminum diethylphosphinate;

[0114] 30 parts by weight of melamine;

[0115] The above-mentioned method for preparing the white highly flame-retardant silica gel buffer material comprises the following steps:

[0116] (1) The above raw materials were kneaded and mixed uniformly in an internal mixer, the initial temperature of the internal mixer was 20°C, the speed was 45r / min, and the kneading time was 180 minutes;

[0117] (2) subjecting the mixed rubber material to vacuum heat treatment at a temperature of 120°C for 60 min;

[0118] (3) After the rubber mix is ​​cooled, 1% of the vulcanizing agent 2,4-dichlorobenzoyl peroxide is added using a two-roll mill;

[0119] (4) After the rubber material is uniformly mixed, it is added to an extruder for continuous extrusion with an extrusion thickness of 1 mm and 2 mm, a drying oven temperature of 200° C., and a time of 5 min. After complete vulcanization, a white highly flame-retardant silicone cushioning material is obtained.

[0120] Among them, the photo of the white high flame retardant silica gel cushioning material of Example 1 is as follows Figure 2 shown.

[0121] Example 2

[0122] This embodiment provides a white highly flame-retardant silica gel cushioning material for new energy, which is made of the following raw materials in parts by weight:

[0123] 100 parts by weight of methyl vinyl silicone rubber, 900,000 molecular weight, 0.16% vinyl content;

[0124] 20 parts by weight of precipitated silica;

[0125] 5 parts by weight of hydroxy silicone oil;

[0126] 60 parts by weight of aluminum diethylphosphinate;

[0127] 30 parts by weight of melamine polyphosphate;

[0128] The above-mentioned method for preparing the white highly flame-retardant silica gel buffer material comprises the following steps:

[0129] (1) The above raw materials were kneaded and mixed uniformly in an internal mixer, the initial temperature of the internal mixer was 20°C, the speed was 45r / min, and the kneading time was 180 minutes;

[0130] (2) subjecting the mixed rubber material to vacuum heat treatment at a temperature of 120°C for 60 min;

[0131] (3) After the rubber mix is ​​cooled, 1% of the vulcanizing agent 2,4-dichlorobenzoyl peroxide is added using a two-roll mill;

[0132] (4) After the rubber material is uniformly mixed, it is added to an extruder for continuous extrusion with an extrusion thickness of 1 mm and 2 mm, a drying oven temperature of 200° C., and a time of 5 min. After complete vulcanization, a white highly flame-retardant silicone cushioning material is obtained.

[0133] Example 3

[0134] This embodiment provides a white highly flame-retardant silica gel cushioning material for new energy, which is made of the following raw materials in parts by weight:

[0135] 100 parts by weight of methyl vinyl silicone rubber, 900,000 molecular weight, 0.16% vinyl content;

[0136] 20 parts by weight of precipitated silica;

[0137] 5 parts by weight of hydroxy silicone oil;

[0138] 60 parts by weight of ammonium polyphosphate;

[0139] 30 parts by weight of melamine;

[0140] The above-mentioned method for preparing the white highly flame-retardant silica gel buffer material comprises the following steps:

[0141] (1) The above raw materials were kneaded and mixed uniformly in an internal mixer, the initial temperature of the internal mixer was 20°C, the speed was 45r / min, and the kneading time was 180 minutes;

[0142] (2) subjecting the mixed rubber material to vacuum heat treatment at a temperature of 120°C for 60 min;

[0143] (3) After the rubber mix is ​​cooled, 1% of the vulcanizing agent 2,4-dichlorobenzoyl peroxide is added using a two-roll mill;

[0144] (4) After the rubber material is uniformly mixed, it is added to an extruder for continuous extrusion with an extrusion thickness of 1 mm and 2 mm, a drying oven temperature of 200° C., and a time of 5 min. After complete vulcanization, a white highly flame-retardant silicone cushioning material is obtained.

[0145] Among them, the photos of the white high flame retardant silica gel cushioning material in the combustion process of Example 3 are as follows Figure 3 shown.

[0146] Example 4

[0147] This embodiment provides a white highly flame-retardant silica gel cushioning material for new energy, which is made of the following raw materials in parts by weight:

[0148] 100 parts by weight of methyl vinyl silicone rubber, 900,000 molecular weight, 0.16% vinyl content;

[0149] 20 parts by weight of precipitated silica;

[0150] 5 parts by weight of hydroxy silicone oil;

[0151] 30 parts by weight of ammonium polyphosphate;

[0152] 30 weight fractions of tricresyl phosphate;

[0153] 30 parts by weight of melamine;

[0154] The above-mentioned method for preparing the white highly flame-retardant silica gel buffer material comprises the following steps:

[0155] (1) The above raw materials were kneaded and mixed uniformly in an internal mixer, the initial temperature of the internal mixer was 20°C, the speed was 45r / min, and the kneading time was 180 minutes;

[0156] (2) subjecting the mixed rubber material to vacuum heat treatment at a temperature of 120°C for 60 min;

[0157] (3) After the rubber mix is ​​cooled, 1% of the vulcanizing agent 2,4-dichlorobenzoyl peroxide is added using a two-roll mill;

[0158] (4) After the rubber material is uniformly mixed, it is added to an extruder for continuous extrusion with an extrusion thickness of 1 mm and 2 mm, a drying oven temperature of 200° C., and a time of 5 min. After complete vulcanization, a white highly flame-retardant silicone cushioning material is obtained.

[0159] Example 5

[0160] This embodiment provides a white highly flame-retardant silica gel cushioning material for new energy, which is made of the following raw materials in parts by weight:

[0161] 100 parts by weight of methyl vinyl silicone rubber, 900,000 molecular weight, 0.16% vinyl content;

[0162] 20 parts by weight of precipitated silica;

[0163] 5 parts by weight of hydroxy silicone oil;

[0164] 30 parts by weight of ammonium polyphosphate;

[0165] 30 parts by weight of tricresyl phosphate;

[0166] 15 parts by weight of melamine;

[0167] 15 parts by weight of melamine polyphosphate;

[0168] The above-mentioned method for preparing the white highly flame-retardant silica gel buffer material comprises the following steps:

[0169] (1) The above raw materials were kneaded and mixed uniformly in an internal mixer, the initial temperature of the internal mixer was 20°C, the speed was 45r / min, and the kneading time was 180 minutes;

[0170] (2) subjecting the mixed rubber material to vacuum heat treatment at a temperature of 120°C for 60 min;

[0171] (3) After the rubber mix is ​​cooled, 1% of the vulcanizing agent 2,4-dichlorobenzoyl peroxide is added using a two-roll mill;

[0172] (4) After the rubber material is uniformly mixed, it is added to an extruder for continuous extrusion with an extrusion thickness of 1 mm and 2 mm, a drying oven temperature of 200° C., and a time of 5 min. After complete vulcanization, a white highly flame-retardant silicone cushioning material is obtained.

[0173] Table 1 Performance comparison table

[0174]

[0175] Test standard: Hardness is tested according to GB / T 531 Shore A hardness test; Flame retardancy: tested according to UL94-V0.

[0176] In summary, the present invention effectively overcomes various shortcomings of the prior art and has high industrial utilization value.

[0177] The above is only a preferred embodiment of the present invention, and is not any formal or substantial limitation of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and supplements without departing from the method of the present invention, and these improvements and supplements should also be regarded as the protection scope of the present invention. Any technician familiar with this profession, without departing from the spirit and scope of the present invention, can make some changes, modifications and evolutions of the technical content disclosed above, which are equivalent embodiments of the present invention; at the same time, any changes, modifications and evolutions of any equivalent changes made to the above embodiments based on the essential technology of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A white highly flame-retardant silica gel cushioning material, characterized in that: Calculated by weight percentage, the following raw materials are included: Silicone rubber 25-50%; Structural control agent 2-5%; Reinforcement filling system 3-20%; Phosphorus flame retardant system 20-40%; Nitrogen-containing flame retardant system 5-25%; The molecular weight of the silicone rubber is 500,000-900,000, and the vinyl content is 0.1%-3%.

2. The white highly flame-retardant silica gel cushioning material according to claim 1, characterized in that: The vinyl content of the silicone rubber raw rubber is 1%-3%; And / or, the silicone rubber raw rubber is methyl vinyl silicone rubber raw rubber.

3. The white highly flame-retardant silica gel cushioning material according to claim 1, characterized in that: The structuring control agent is selected from one or more mixtures of hydroxy silicone oil, hydroxy vinyl silicone oil, methoxy silicone oil, hydrogen-containing silicone oil, phenyl silicone oil coupling agent 171, coupling agent 172, coupling agent 151.

4. The white highly flame-retardant silica gel cushioning material according to claim 1, characterized in that: The reinforcing filling system is selected from one or more of precipitated silica and fumed silica.

5. The white highly flame-retardant silica gel cushioning material according to claim 1, characterized in that: The phosphorus-based flame retardant system is selected from two or three of tricresyl phosphate, triisopropylphenyl phosphate, ammonium polyphosphate, diethylaluminum phosphinate, and dialkylaluminum phosphinate.

6. The white highly flame-retardant silica gel cushioning material according to claim 1, characterized in that: The nitrogen-containing flame retardant system is one or more of melamine, dicyandiamide and melamine phosphate.

7. The method for preparing a white highly flame-retardant silica gel cushioning material according to any one of claims 1 to 6, characterized in that: The preparation method comprises the following steps: S1: adding silicone rubber raw rubber, structural control agent, reinforcing filling system, phosphorus flame retardant system and nitrogen flame retardant system into a kneader, kneading and forming, and then performing vacuum heat treatment to obtain a mixed rubber material; S2: adding the mixed rubber material and curing agent obtained in S1 to a double-roll mill in sequence for mixing to obtain a silicone rubber mixed rubber; S3: The silicone rubber compound obtained in S2 is added into an extruder to realize continuous extrusion. After extrusion, the silicone rubber is quickly vulcanized through a drying oven to obtain a white highly flame-retardant silicone cushioning material.

8. The method for preparing the white highly flame-retardant silica gel cushioning material according to claim 7, characterized in that: In step S1), the initial mixing temperature is 20-40°C and the rotation speed is 35-45r / min. And / or, in step S1), the vacuum heat treatment temperature is 60-120°C, the vacuum degree is -0.1MPa, and the vacuum heat treatment time is 60-120 minutes; And / or, in step S2), the curing agent is 2,4-dichlorobenzoyl peroxide; And / or, in step S2), the mixing time is 120-180 minutes.

9. The method for preparing a white highly flame-retardant silica gel cushioning material according to claim 7, characterized in that: In step S3), the extruder extrusion speed is 5-80rpm; And / or, in step S3), the drying oven temperature is 160-240°C.

10. Application of the white highly flame-retardant silicone cushioning material according to any one of claims 1 to 6 and / or the white highly flame-retardant silicone cushioning material prepared by the preparation method according to any one of claims 7 to 9 in the fields of new energy, fire prevention and flame retardancy.

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