CN109401321A - Expandable flame retardant room temperature vulcanized silicone rubber formula and expandable flame retardant room temperature vulcanized silicone rubber - Google Patents
Expandable flame retardant room temperature vulcanized silicone rubber formula and expandable flame retardant room temperature vulcanized silicone rubber Download PDFInfo
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- CN109401321A CN109401321A CN201811130412.1A CN201811130412A CN109401321A CN 109401321 A CN109401321 A CN 109401321A CN 201811130412 A CN201811130412 A CN 201811130412A CN 109401321 A CN109401321 A CN 109401321A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/322—Ammonium phosphate
- C08K2003/323—Ammonium polyphosphate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
Abstract
This application provides a kind of expandable flame retardant room temperature vulcanized silicone rubber formula and expandable flame retardant room temperature vulcanized silicone rubbers.The expandable flame retardant room temperature vulcanized silicone rubber formula according to the mass fraction, forms are as follows: α, alpha, omega-dihydroxy polydimethyl siloxane, and 100 parts；Reinforced filling, 3 parts~10 parts；Intumescent Retardant System, 30 parts~50 parts；Crosslinking agent, 1 part~3 parts；Catalyst, 0.5 part~3 parts；The Intumescent Retardant System includes acid source, gas source, charcoal source, and the charcoal source is selected from chitosan.The expandable flame retardant room temperature vulcanized silicone rubber formula of the application contains using natural macromolecular material chitosan as the Intumescent Retardant System in charcoal source, it is extensive with raw material sources, low in cost, environmental-friendly advantage, the expandable flame retardant room temperature vulcanized silicone rubber that is formed through over cure of expandable flame retardant room temperature vulcanized silicone rubber formula also has that flame retardant property is good simultaneously, good mechanical property and the good advantage of processing performance.
Description
Technical field
This application involves rubber materials more particularly to a kind of expandable flame retardant room temperature vulcanized silicone rubber formula and expandable flame retardant rooms
Temperature vulcanizable silicone rubber.
Background technique
Room temperature vulcanized silicone rubber has excellent electrical insulating property, weatherability, moisture resistance, shock resistance, crushing resistance and physiology
Inertia can be widely applied to all trades and professions.Room temperature vulcanized silicone rubber is not necessarily to heating at room temperature, pressurization can be cured in situ, and makes
With extremely convenient.But silicon rubber itself is inflammable, this limits it in electric, automobile and aerospace etc. to a certain extent
The application in field, therefore developing, there is the room temperature vulcanized silicone rubber of good flame-retardance to have great importance.
The research of current fire-retardant room temperature vulcanized silicone rubber has made some progress, fire retardant various types, more than selection
Ground is very big, but there is also many deficiencies.For example, traditional halogen containing flame-retardant can discharge toxic hydrogen halides in combustion
Gas easily causes damages to human body, environment.It is main component expansion type flame retardant due to having the spies such as efficient, low toxicity using phosphorus, nitrogen
Property gradually replaced halogen containing flame-retardant applied to the heat in the flame retardant treatment of high molecular material, becoming the research of current flame-retarded technology
Point, and be for main component expansion type flame retardant for traditional phosphorus, nitrogen, charcoal source is mainly derived from petroleum cracking product,
With advances in technology with the development of society, non-renewable petroleum resources consume the appearance that will lead to energy crisis excessively,
And it can also bring a series of environmental problem.
Therefore, it is very necessary for studying a kind of expandable flame retardant room temperature vulcanized silicone rubber containing renewable charcoal source.
Summary of the invention
In view of the problems in the background art, the application is designed to provide a kind of expandable flame retardant room temperature vulcanization silicon rubber
Glue formula and expandable flame retardant room temperature vulcanized silicone rubber, the expandable flame retardant room temperature vulcanized silicone rubber have good flame retardant property,
Also have the advantages that simultaneously environmental-friendly, low in cost.
In order to achieve the above object, the application's in a first aspect, this application provides a kind of expandable flame retardant room temperature vulcanizations
Silicone rubber formulations, according to the mass fraction, composition are as follows: α, alpha, omega-dihydroxy polydimethyl siloxane, 100 parts；Reinforced filling, 3 parts~
10 parts；Intumescent Retardant System, 30 parts~50 parts；Crosslinking agent, 1 part~3 parts；Catalyst, 0.5 part~3 parts；The expandable flame retardant body
System includes acid source, gas source, charcoal source, and the charcoal source is selected from chitosan.
In the second aspect of the application, this application provides a kind of expandable flame retardant room temperature vulcanized silicone rubbers, by the application
The expandable flame retardant room temperature vulcanized silicone rubber formula of first aspect is formed through over cure.
Compared with the existing technology, the application has the beneficial effect that
The expandable flame retardant room temperature vulcanized silicone rubber formula of the application contains using natural macromolecular material chitosan as charcoal source
Intumescent Retardant System, advantage extensive with raw material sources, low in cost, environmental-friendly, while being hindered by the expansion of the application
The expandable flame retardant room temperature vulcanized silicone rubber that is formed through over cure of combustion room temperature vulcanized silicone rubber formula also has that flame retardant property is good, machinery
The advantage that performance is good and processing performance is good.
Specific embodiment
The following detailed description of expandable flame retardant room temperature vulcanized silicone rubber formula, the expandable flame retardant room temperature vulcanization silicon according to the application
Rubber and preparation method thereof.
Illustrate the expandable flame retardant room temperature vulcanized silicone rubber formula according to the application first aspect first, by mass fraction
Meter, organizing becomes α, alpha, omega-dihydroxy polydimethyl siloxane, and 100 parts；Reinforced filling, 3 parts~10 parts；Intumescent Retardant System, 30 parts
~50 parts；Crosslinking agent, 1 part~3 parts；Catalyst, 0.5 part~3 parts；The Intumescent Retardant System includes acid source, gas source, charcoal source,
The charcoal source is selected from chitosan.
In the formula of the expandable flame retardant room temperature vulcanized silicone rubber according to the application first aspect, the expandable flame retardant room
Temperature vulcanizable silicone rubber compounding forms expandable flame retardant room temperature vulcanized silicone rubber through over cure, wherein α, alpha, omega-dihydroxy polydimethyl silicon
Oxygen alkane is base polymer, but its mechanical performance is usually poor, and reinforced filling can play and improve expandable flame retardant room temperature vulcanization silicon
The effect of rubber manufacturing machinery performance, crosslinking agent can make each constituent of expandable flame retardant room temperature vulcanized silicone rubber be crosslinked and be sulfided into
Type, catalyst can then play the role of promoting vulcanization, can significantly shorten vulcanization time, improve curing efficiency, expandable flame retardant body
System can be such that expandable flame retardant room temperature vulcanized silicone rubber has excellent fire-retardant by the interaction between acid source, gas source, charcoal source
Performance.In Intumescent Retardant System, the chitosan (also known as chitosan, CS) as charcoal source is by extensive in nature
Existing chitin passes through the high molecular polymer that deacetylation obtains, therefore usually has from a wealth of sources, low in cost, ring
Border close friend and reproducible advantage, while in Intumescent Retardant System, the whether excellent effect for directly determining expandable flame retardant in charcoal source
Fruit, chitosan are the macromolecule charcoal sources on molecular structure containing great amount of hydroxy group, can be replaced in traditional Intumescent Retardant System
Charcoal source based on petroleum cracking product (for example, pentaerythrite), and it is in short supply and limit expandable flame retardant to can solve petroleum resources
The manufacturing problem of room temperature vulcanized silicone rubber.
Preferably, the deacetylation of the chitosan is 85%~95%.
It is further preferred that the deacetylation of the chitosan is 90%.
In the formula of the expandable flame retardant room temperature vulcanized silicone rubber according to the application first aspect, in Intumescent Retardant System
In, the function of the acid source is that esterification occurs with charcoal source to be dehydrated charcoal source, specifically: at relatively low temperature, acid
Source can release acidic materials (such as poly-metaphosphoric acid), then it is a little higher than release acid at a temperature of, acidic materials can be with charcoal source
Esterification occurs, the product of esterification is dehydrated into charcoal and forms layer of charcoal, and Intumescent Retardant System starts to melt, and esterification produces
The non-flammable gases that raw vapor and gas source generate are filled out into carbon-coating, keep molten system expanded foamed, reaction is nearly completed
When, layer of charcoal solidification ultimately forms porous foam layer of charcoal, to achieve the purpose that expandable flame retardant.
Preferably, in the intumescent system, acid source, the sum of the mass fraction of gas source and the mass parts ratio in charcoal source are 6:
1~1.5:1.
It is further preferred that in the intumescent system, the mass fraction with charcoal source of the sum of mass fraction of acid source, gas source
Than for 4:1~2:1.
In the formula of the expandable flame retardant room temperature vulcanized silicone rubber according to the application first aspect, due to the function of acid source
It is to discharge acidic materials at relatively low temperature and esterification occurs with charcoal source to make the dehydration of charcoal source, therefore acid source at least needs
Acidic materials can be discharged at a lower temperature by meeting, and charcoal source is made to be dehydrated the two conditions simultaneously.
Preferably, the acid source include one of ammonium polyphosphate based flame retardant, melamine phosphate based flame retardant or
Two kinds.The ammonium polyphosphate based flame retardant is preferably crystal form II ammonium polyphosphate based flame retardant, further preferably branched knot
One or more of brilliant II type ammonium polyphosphate, silane cladding crystal form II ammonium polyphosphate.The poly- phosphorus of branched crystalline Form II
The type that sour ammonium, silane coat crystal form II ammonium polyphosphate does not limit specifically, can be selected according to actual needs.Specifically
Ground, the branched crystal form II ammonium polyphosphate can be selected from ammonium polyphosphate TY-423, and the degree of polymerization is greater than 1000, and has preferable
Hydrolytic resistance, while good dispersion in the polymer, the silane cladding crystal form II ammonium polyphosphate can be selected from ammonium polyphosphate
SD-2016E, the higher and compatibility with polymer of the degree of polymerization is good, and dosage is few, but the application is not intended to limit and this；Described three
Poly cyanamid phosphoric acid salt fire retardant can be selected from melamine polyphosphate (MPP), in two melamine pyrophosphates (DMPY)
It is one or two kinds of.
The expandable flame retardant room temperature vulcanized silicone rubber according to the application first aspect formula in, the effect of gas source be
It decomposes with temperature range before curing after Intumescent Retardant System melting and releases a large amount of nontoxic and nonflammable gases.
Preferably, the gas source include one of ammonium polyphosphate based flame retardant, melamine phosphate based flame retardant or
Two kinds.The ammonium polyphosphate based flame retardant is preferably crystal form II ammonium polyphosphate based flame retardant, further preferably branched knot
One or more of brilliant II type ammonium polyphosphate, silane cladding crystal form II ammonium polyphosphate, the poly- phosphorus of branched crystalline Form II
The type that sour ammonium, silane coat crystal form II ammonium polyphosphate does not limit specifically, can be selected according to actual needs, specifically
Ground, the branched crystal form II ammonium polyphosphate can be selected from ammonium polyphosphate TY-423, and the degree of polymerization is greater than 1000, and has preferable
And hydrolytic resistance, while good dispersion in the polymer, the silane cladding crystal form II ammonium polyphosphate can be selected from polyphosphoric acid
Ammonium SD-2016E, the higher and compatibility with polymer of the degree of polymerization is good, and dosage is few, but the application is not intended to limit and this；It is described
Melamine phosphate based flame retardant can be selected from melamine polyphosphate (MPP), in two melamine pyrophosphates (DMPY)
One or two.
Herein it should be noted that the ammonium polyphosphate based flame retardant and melamine phosphate based flame retardant have acid source
With gas source dual function, the reason is that, after one side ammonium polyphosphate based flame retardant and melamine phosphate based flame retardant are heated
The polyphosphoric acid with high dehydrated energy can be generated, polyphosphoric acid can occur esterification with charcoal source and make the product of esterification
Dehydration forms charcoal, forms carbon-coating, another aspect ammonium polyphosphate based flame retardant and melamine phosphate based flame retardant are thermally decomposed
The non-flammable gases such as vapor, nitrogen, ammonia can be released, to make ammonium polyphosphate based flame retardant and melamine phosphate
Based flame retardant has both two kinds of functions of acid source and gas source.Additionally due to there is certain synergistic fire retardation between phosphorus-silicon-nitrogen, therefore
And the expandable flame retardant room temperature vulcanized silicone rubber of the application can have good flame retardant property.
It is further preferred that the gas source may also include melamine (MC).
In the formula of the expandable flame retardant room temperature vulcanized silicone rubber according to the application first aspect, the α, ω-dihydroxy
The viscosity of base dimethyl silicone polymer is 5000mPas~40000mPas.
In the formula of the expandable flame retardant room temperature vulcanized silicone rubber according to the application first aspect, the reinforced filling choosing
From one or both of hydrophobic type fume colloidal silica, hydrophobic type precipitated silica, it is preferable that the reinforced filling is selected from
Hydrophobic type fume colloidal silica.Preferably, the specific surface area of the hydrophobic type fume colloidal silica is 100m2/ g~300m2/g。
In the formula of the expandable flame retardant room temperature vulcanized silicone rubber according to the application first aspect, the crosslinking agent is selected from
One or both of ethyl orthosilicate, positive silicic acid propyl ester, it is preferable that the crosslinking agent is selected from ethyl orthosilicate.
In the formula of the expandable flame retardant room temperature vulcanized silicone rubber according to the application first aspect, the catalyst is selected from
One or both of dibutyl tin dilaurate, tin dilaurate dioctyl tin, it is preferable that the catalyst is selected from tin dilaurate
Dibutyl tin.
Secondly illustrate the expandable flame retardant room temperature vulcanized silicone rubber according to the application second aspect, by the application first aspect
The expandable flame retardant room temperature vulcanized silicone rubber formula is formed through over cure.
In the expandable flame retardant room temperture rubber vulcanization according to the application second aspect, the vulcanization is at room temperature
It carries out, time of the vulcanization is 12h~for 24 hours.
The preparation method for illustrating the expandable flame retardant room temperature vulcanized silicone rubber according to three aspect of the application again, is used to prepare this
Apply for expandable flame retardant room temperature vulcanized silicone rubber described in second aspect comprising step S1, by α, alpha, omega-dihydroxy polydimethyl silicon
Oxygen alkane, reinforced filling, which are sufficiently mixed, to stir evenly, and is then added and Intumescent Retardant System and continues to stir, be subsequently added into crosslinking agent and
Catalyst obtains mixed material after being thoroughly mixed uniformly；Said mixture material is poured into mold, vacuumizes degasification by S2
Room temperature vulcanization reaction is carried out after bubble, obtains expandable flame retardant room temperature vulcanized silicone rubber after reaction.
In the preparation method of expandable flame retardant room temperature vulcanized silicone rubber according to the application second aspect, step S1
In, the Intumescent Retardant System can prepare in advance, can also sequentially add in order, and preparation method is not particularly limited,
It can be selected according to the actual situation.
In the preparation method of expandable flame retardant room temperature vulcanized silicone rubber according to the application second aspect, step S2
In, the room temperature cured time is 12h~for 24 hours.
Below with reference to embodiment, the application is further described.It should be understood that these embodiments be merely to illustrate the application without
For limiting scope of the present application.
Embodiment 1
The α for being 10000mPas by 100 parts of viscosity, alpha, omega-dihydroxy polydimethyl siloxane (107 glue), 5 parts of specific surfaces
Product is 200m2The hydrophobic type fume colloidal silica of/g is thoroughly mixed uniformly, and 38 parts of preparatory prepared expansions are then added
Flame-retardant system simultaneously continues to stir, wherein the chitosan that Intumescent Retardant System is 90% by ammonium polyphosphate TY-423 and deacetylation
(CS) it forms, the portion rate of ammonium polyphosphate TY-423 and chitosan is 30:8, is subsequently added into 2 parts of ethyl orthosilicates and 1.5 part two
Dibutyl tin laurate is thoroughly mixed uniformly, then is poured into Teflon mold, paves after vacuumizing bubble removing, room
Warm vulcanization reaction obtains expandable flame retardant room temperature vulcanized silicone rubber afterwards for 24 hours.
Embodiment 2
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 40 parts, wherein Intumescent Retardant System is by ammonium polyphosphate TY-423 and de- second
The chitosan (CS) that acyl degree is 90% forms, and the portion rate of ammonium polyphosphate TY-423 and chitosan is 30:10.
Embodiment 3
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 42 parts, wherein Intumescent Retardant System is by ammonium polyphosphate TY-423 and de- second
The chitosan (CS) that acyl degree is 90% forms, and the portion rate of ammonium polyphosphate TY-423 and chitosan is 30:12.
Embodiment 4
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 50 parts, wherein Intumescent Retardant System is by ammonium polyphosphate TY-423 and de- second
The chitosan (CS) that acyl degree is 90% forms, and the portion rate of ammonium polyphosphate TY-423 and chitosan is 30:20.
Embodiment 5
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 35 parts, wherein Intumescent Retardant System is by ammonium polyphosphate TY-423 and de- second
The chitosan (CS) that acyl degree is 90% forms, and the portion rate of ammonium polyphosphate TY-423 and chitosan is 30:5
Embodiment 6
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 40 parts, wherein Intumescent Retardant System is by silane coated ammonium polyphosphate SD-
The chitosan (CS) that 2016E and deacetylation are 90% forms, the number of silane coated ammonium polyphosphate SD-2016E and chitosan
Than for 30:10.
Embodiment 7
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 40 parts, wherein Intumescent Retardant System is by melamine polyphosphate (MPP)
The chitosan (CS) for being 90% with deacetylation forms, and the portion rate of melamine polyphosphate (MPP) and chitosan is 30:
10。
Embodiment 8
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 40 parts, wherein Intumescent Retardant System is by two melamine pyrophosphates
(DMPY) it is formed with deacetylation for 90% chitosan (CS), the number of two melamine pyrophosphates (DMPY) and chitosan
Than for 30:10.
Embodiment 9
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 40 parts, wherein Intumescent Retardant System is by silane coated ammonium polyphosphate SD-
The chitosan (CS) that 2016E, melamine polyphosphate (MPP) and deacetylation are 90% forms, silane coated ammonium polyphosphate
The portion rate of SD-2016E, melamine polyphosphate (MPP) and chitosan are 25:5:10.
Embodiment 10
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 40 parts, wherein Intumescent Retardant System is by silane coated ammonium polyphosphate SD-
The chitosan (CS) that 2016E, two melamine pyrophosphates (DMPY) and deacetylation are 90% forms, and silane coats polyphosphoric acid
The portion rate of ammonium SD-2016E, two melamine pyrophosphates (DMPY) and chitosan are 25:5:10.
Embodiment 11
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 40 parts, wherein Intumescent Retardant System is by silane coated ammonium polyphosphate SD-
The chitosan (CS) that 2016E, melamine (MC) and deacetylation are 90% forms, silane coated ammonium polyphosphate SD-2016E,
The portion rate of melamine (MC) and chitosan is 25:5:10.
Comparative example 1
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 30 parts, and Intumescent Retardant System only includes ammonium polyphosphate TY-423.
Comparative example 2
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 30 parts, and Intumescent Retardant System only includes silane coated ammonium polyphosphate SD-
2016E。
Comparative example 3
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 30 parts, and Intumescent Retardant System only includes melamine polyphosphate
(MPP)。
Comparative example 4
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 30 parts, and Intumescent Retardant System only includes two melamine pyrophosphates
(DMPY)。
Comparative example 5
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 20 parts, wherein Intumescent Retardant System is by ammonium polyphosphate TY-423 and de- second
The chitosan (CS) that acyl degree is 90% forms, and the portion rate of ammonium polyphosphate TY-423 and chitosan is 15:5
Comparative example 6
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 60 parts, wherein Intumescent Retardant System is by ammonium polyphosphate TY-423 and de- second
The chitosan (CS) that acyl degree is 90% forms, and the portion rate of ammonium polyphosphate TY-423 and chitosan is 40:20
Comparative example 7
The preparation method is the same as that of Example 1 for expandable flame retardant room temperature vulcanized silicone rubber, and difference is,
The addition number of Intumescent Retardant System is 50 parts, wherein Intumescent Retardant System is by ammonium polyphosphate TY-423 and season penta
Tetrol composition, ammonium polyphosphate TY-423, pentaerythrite portion rate be 30:20.
According to the vertical combustion grade of the GB/T 10707-2008 fire-retardant room temperature vulcanized silicone rubber measured, sample ruler
Very little is 130mm × 13mm × 3mm, and the performance indicator of obtained fire-retardant room temperature vulcanized silicone rubber is as shown in table 1.
The performance test results of table 1 embodiment 1-11 and comparative example 1-7
By the test result analysis of table 1 it is found that the expandable flame retardant room temperature vulcanized silicone rubber of the application has good resistance
Fire performance.
In embodiment 1-11 and comparative example 1-4, comparative example 7, the expandable flame retardant room temperature vulcanized silicone rubber of embodiment 1-11
In Intumescent Retardant System using chitosan as charcoal source, its vertical combustion grade reaches FV-1 or more after tested, or even most of
It can reach the highest level FV-0 of vertical combustion grade.The expandable flame retardant body of the expandable flame retardant room temperature vulcanized silicone rubber of comparative example 1
Charcoal source is not contained in system, vertical combustion grade only reaches FV-2, and the expandable flame retardant room temperature vulcanized silicone rubber of comparative example 2-4
Charcoal source is not contained in Intumescent Retardant System, vertical combustion grade does not reach flame-retardancy requirements, the i.e. expansion of comparative example 2-4 yet
Fire-retardant room temperature vulcanized silicone rubber is not over flame retardant test, the expandable flame retardant of the expandable flame retardant room temperature vulcanized silicone rubber of comparative example 6
System is using petroleum cracking product pentaerythrite as charcoal source, and vertical combustion grade can achieve FV-0, but the use of pentaerythrite
Measure it is more, and compared to chitosan for, source is limited, higher cost can also generate certain harm simultaneously to environment, and
The Intumescent Retardant System of the expandable flame retardant room temperature vulcanized silicone rubber of the application with chitosan charcoal source, it is from a wealth of sources, low in cost,
It is environmentally friendly simultaneously, while expandable flame retardant room temperature vulcanized silicone rubber flame retardant property is preferable.
In comparative example 5, the mass fraction of Intumescent Retardant System is too low, point in expandable flame retardant room temperature vulcanized silicone rubber
Cloth is less, so that fire retardation can not be effectively acted as；In comparative example 6, the mass fraction of Intumescent Retardant System is excessively high, Ke Yili
Solution, necessarily will affect expandable flame retardant room temperature vulcanized silicone rubber as the due performance of rubber, for example, mechanical performance etc..
The application is described in detail above, its object is to allow the personage for being familiar with this field technology that can understand this
The content of application is simultaneously implemented, and the protection scope of the application can not be limited with this, all according to spirit herein essence institute
The equivalent change or modification of work, should all cover in the application includes in range.
Claims (10)
1. a kind of expandable flame retardant room temperature vulcanized silicone rubber formula, which is characterized in that according to the mass fraction, composition are as follows:
α, alpha, omega-dihydroxy polydimethyl siloxane, 100 parts；
Reinforced filling, 3 parts~10 parts；
Intumescent Retardant System, 30 parts~50 parts；
Crosslinking agent, 1 part~3 parts；
Catalyst, 0.5 part~3 parts；
The Intumescent Retardant System includes acid source, gas source, charcoal source, and the charcoal source is selected from chitosan.
2. expandable flame retardant room temperature vulcanized silicone rubber formula according to claim 1, which is characterized in that the chitosan takes off
Acetyl degree is 85%~95%, it is preferable that the deacetylation of the chitosan is 90%.
3. expandable flame retardant room temperature vulcanized silicone rubber formula according to claim 1, which is characterized in that the expandable flame retardant body
In system, acid source, the sum of the mass fraction of gas source and the mass parts ratio in charcoal source are 6:1~1.5:1, it is preferable that acid source, gas source
The mass parts ratio in the sum of mass fraction and charcoal source is 4:1~2:1.
4. expandable flame retardant room temperature vulcanized silicone rubber formula according to claim 1, which is characterized in that
The acid source includes one or more of ammonium polyphosphate based flame retardant, melamine phosphate based flame retardant；
The gas source includes one or more of ammonium polyphosphate based flame retardant, melamine phosphate based flame retardant.
5. expandable flame retardant room temperature vulcanized silicone rubber formula according to claim 4, which is characterized in that
The ammonium polyphosphate based flame retardant includes crystal form II ammonium polyphosphate based flame retardant, it is preferable that the poly- phosphorus of crystalline Form II
Sour ammonium based flame retardant is selected from one of branched crystal form II ammonium polyphosphate, silane cladding crystal form II ammonium polyphosphate or several
Kind.
6. expandable flame retardant room temperature vulcanized silicone rubber formula according to claim 4, which is characterized in that the melamine phosphorus
Hydrochlorate based flame retardant is selected from one or both of melamine polyphosphate, two melamine pyrophosphates.
7. expandable flame retardant room temperature vulcanized silicone rubber formula according to claim 4, which is characterized in that the gas source further includes
Melamine.
8. expandable flame retardant room temperature vulcanized silicone rubber formula according to claim 1, which is characterized in that the α, ω-dihydroxy
The viscosity of base dimethyl silicone polymer is 5000mPas~40000mPas.
9. expandable flame retardant room temperature vulcanized silicone rubber formula according to claim 1, which is characterized in that
The reinforced filling is selected from one or both of hydrophobic type fume colloidal silica, hydrophobic type precipitated silica, preferably
Ground, the reinforced filling are selected from hydrophobic type fume colloidal silica；
The crosslinking agent is selected from one or both of ethyl orthosilicate, positive silicic acid propyl ester, it is preferable that the crosslinking agent is selected from just
Silester；
The catalyst is selected from one or both of dibutyl tin dilaurate, tin dilaurate dioctyl tin, it is preferable that described
Catalyst is selected from dibutyl tin dilaurate.
10. a kind of expandable flame retardant room temperature vulcanized silicone rubber, which is characterized in that the expandable flame retardant room temperature vulcanized silicone rubber is by right
It is required that expandable flame retardant room temperature vulcanized silicone rubber formula described in any one of 1-9 is formed through over cure.
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| CN201811130412.1A CN109401321A (en) | 2018-09-27 | 2018-09-27 | Expandable flame retardant room temperature vulcanized silicone rubber formula and expandable flame retardant room temperature vulcanized silicone rubber |
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