Bi-component organic silicon casting glue and its preparation process
Technical field
The present invention relates to a kind of two component more particularly to a kind of bi-component organic silicon casting glues.
Background technique
Organic silicon potting adhesive is due to excellent electrical insulation capability, high temperature resistance and ageing-resistant performance, goodization
Stability is learned, the advantages that processing technology is easy is widely used in electronics encapsulating field, plays moisture-proof, anticorrosion, shockproof, dust-proof
Effect, not only can be improved the service performance of electronic product, moreover it is possible to stablize the parameter of electronic component.But common organosilicon encapsulating
Glue there are thermal conductivities it is low, flame retardant property and adhesive property are poor the disadvantages of, seriously affected its application range.With present information skill
The development of art, electronic component, logic circuit tend to densification and miniaturization and the raising of appliance power, lead to electronic product unit
The heat of area is continuously increased, this proposes thermally conductive and fire-retardant new demand to organic silicon potting adhesive.At present generally by adding
Add a large amount of heat filling and inorganic fire retardants to prepare while have thermally conductive and anti-flammability organic silicon potting adhesive, so often
Cause physical mechanical property, mobility of casting glue etc. to decline, how to effectively improve the thermally conductive and flame retardant property of casting glue without
Being substantially reduced other performance is the difficult point studied at present.
At the same time, as the new generation of green light source and lighting engineering of environmental protection and energy saving, great power LED obtains fastly in recent years
Speed development.Great power LED still has the unsmooth and not high problem of light emission rate that radiates, because heat dissipation directly influences the reliable of LED
Property, and then influence its service life and application, and light emission rate is low directly constrains the development of LED, so being led to LED encapsulation material
It is hot, fire-retardant and out optical property research just seem increasingly important.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that it is organic to disclose two-component
Its preparation process of silicon casting glue machine, it is steady which maintains remaining performance while promoting thermally conductive and flame retardant property
It is fixed.
In order to achieve the above object, bi-component organic silicon casting glue of the invention, is achieved using following technical scheme:
Bi-component organic silicon casting glue, including component A and B component:
The component A by vinyl silicone oil, dimethicone, silicon powder, aluminium oxide, aluminium nitride, boron nitride, LSR base rubber,
Platinum catalyst is formed by certain weight ratio mixing,
The B component by vinyl silicone oil, dimethicone, methyl hydrogen siloxane, silicon powder, aluminium oxide, LSR base rubber,
White carbon black, tackifier, inhibitor are by certain weight ratio mixing composition;
The mixing ratio of the A component and B component is 1:1.
Further,
In the component A, vinyl silicone oil, dimethicone, silicon powder, aluminium oxide, aluminium nitride, boron nitride, LSR base
The weight ratio of glue, platinum catalyst are as follows: 100:(50~65): (20~30): (5~10): (5~10): (5~10): (20~30):
(0.5~3);
In the B component, vinyl silicone oil, dimethicone, methyl hydrogen siloxane, silicon powder, aluminium oxide, LSR base rubber,
The weight ratio of white carbon black, tackifier, inhibitor are as follows: 100:(50~65): (20~30): (20~30): (5~10): (20~
30): (5~15): (0.1~1): (0.1~3);
Further, in the component A using micron grade aluminum oxide, nanoscale aluminium nitride and boron nitride mixed fillers and
The shape of mixed fillers includes laminal filter, bat wool and ball filler;Mixed fillers described in the bat wool station
The 5~25% of total amount.
Moreover: the aluminium oxide, aluminium nitride and boron nitride are provided with there are many grain size specification;A variety of grains
Diameter specification is large, medium and small three kinds of grain size specifications;The mixed proportion of large, medium and small three kinds of grain size specifications is 10:30:15.
Further, the dosage of the platinum catalyst is less than 24ppm;The vinyl and methyl hydrogen of the vinyl silicone oil
The molar ratio of the silicon hydrogen-based of siloxanes is 1:(1~1.2).
Further, also including fire retardant;The fire retardant is halogen-free flame retardants;Halogen-free flame retardants be aluminium hydroxide,
One of magnesium hydroxide and zinc borate are a variety of;The halogen-free flame retardants by surface treatment, it is described surface treatment for via
Organosilicon processing.
Moreover: the fire retardant includes inorganic fire retardants and generates cooperateing with for synergistic effect with inorganic fire retardants
Fire retardant;The inorganic fire retardants is Strong oxdiative aluminium, and the synergistic fire retardant is platinum complex fire retardant.
The preparation process of bi-component organic silicon casting glue disclosed by the invention, comprises the following steps:
(1) preparation of component A;
Vinyl silicone oil, silicon powder, aluminium oxide, aluminium nitride and boron nitride high speed dispersion are mixed;High speed dispersion is mixed
Material afterwards is added in LSR base rubber and mixes with platinum catalyst, dimethicone, deaeration, solidifies up to component A;
(2) preparation of component B;
Vinyl silicone oil, dimethicone and aluminium oxide high speed dispersion are mixed;The mixed material of high speed dispersion is added
Enter in LSR base rubber and mixed with methyl hydrogen siloxane, silicon powder, tackifier, inhibitor and white carbon black, deaeration, solidified up to group
Part B;
(3) component A and component B is uniformly mixed under the action of high speed shear is dispersed by the mass ratio of 1:1, is placed in vacuum
Vacuum defoamation 10 minutes in drying box are subsequently poured into room temperature curing in mold or are heating and curing.
Further, the solidification temperature in the step (3) is 25~100 DEG C.
The medicine have the advantages that
In bi-component organic silicon glue casting glue of the invention, conductive filler material is multiple using aluminium oxide, aluminium nitride, boron nitride
The mode for closing filling, realizes organic silica gel maximum thermal conductivity.In addition, the present invention passes through specific matrix component and platinum catalysis
Agent can be realized a series of indexs such as the wide temperature range application of organic silica gel and flame retardant property, dielectric constant, linear shrinkage ratio, energy
Enough meet great power LED encapsulating application demand.
The present invention is also half reinforced filling using vinyl silicone oil, containing hydrogen silicone oil as crosslinking agent, silicon powder, is prepared for viscosity
It can good and excellent in mechanical performance after solidifying bi-component organic silicon casting glue.
Detailed description of the invention
Fig. 1 is the process flow chart of the component A of the preparation process of bi-component organic silicon casting glue of the invention;
Fig. 2 is the process flow chart of the component B of the preparation process of bi-component organic silicon casting glue of the invention.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily.
The present invention improves existing two-component casting glue;The invention discloses a kind of more preferably bi-component organic silicons
Casting glue;Specific embodiment is as follows:
Embodiment 1:
Component A: vinyl silicone oil, dimethicone, silicon powder, aluminium oxide, aluminium nitride, boron nitride, LSR base rubber, platinum are urged
The weight ratio of agent are as follows: 100:60:25:8:8:8:25:2;
Component B: vinyl silicone oil, dimethicone, methyl hydrogen siloxane, silicon powder, aluminium oxide, LSR base rubber, hard charcoal
The weight ratio of black, tackifier, inhibitor are as follows: 100:60:25:25:8:25:10:0.5:2;
For component A: vinyl silicone oil, silicon powder, aluminium oxide, aluminium nitride and boron nitride high speed dispersion are mixed;It will be high
Material after fast dispersion mixing is added in LSR base rubber and mixes with platinum catalyst, dimethicone, deaeration, solidifies up to component
A;
For component B: vinyl silicone oil, dimethicone and aluminium oxide high speed dispersion are mixed;High speed dispersion is mixed
Rear material is added in LSR base rubber and mixes with methyl hydrogen siloxane, silicon powder, tackifier, inhibitor and white carbon black, deaeration,
Solidify up to component B;
Component A and component B is uniformly mixed under the action of high speed shear is dispersed by the mass ratio of 1:1, it is dry to be placed in vacuum
Vacuum defoamation 10 minutes in dry case are subsequently poured into room temperature curing in mold or are heating and curing.
Embodiment 2:
2 difference from Example 1 of embodiment is:
Component A: vinyl silicone oil, dimethicone, silicon powder, aluminium oxide, aluminium nitride, boron nitride, LSR base rubber, platinum are urged
The weight ratio of agent are as follows: 100:50:20:5:5:5:20:0.5;
Component B: vinyl silicone oil, dimethicone, methyl hydrogen siloxane, silicon powder, aluminium oxide, LSR base rubber, hard charcoal
The weight ratio of black, tackifier, inhibitor are as follows: 100:50:20:20:5:20:5:0.1:0.1.
Embodiment 3:
3 difference from Example 1 of embodiment is:
Component A: vinyl silicone oil, dimethicone, silicon powder, aluminium oxide, aluminium nitride, boron nitride, LSR base rubber, platinum are urged
The weight ratio of agent are as follows: 100:65:30:10:10:10:30:3;
Component B: vinyl silicone oil, dimethicone, methyl hydrogen siloxane, silicon powder, aluminium oxide, LSR base rubber, hard charcoal
The weight ratio of black, tackifier, inhibitor are as follows: 100:65:30:30:10:30:15:1:3.
For product made from Examples 1 to 3, We conducted measurements, obtain following result:
Curing time < 480min (25 DEG C), < 20min (80 DEG C);
Thermal coefficient >=3.0W/mk;
Dielectric strength >=27kV/mm;
Dielectric constant 3.0~3.3 (1.2MHz);
Volume resistivity >=1.0 × 1014 Ω cm (25 DEG C);
Linear expansion coefficient≤2.2 × 10-4m/ (mK)
Therefore, the present invention has that thermal conductivity is big, and flame retardant property is good;Viscosity performance of the present invention is good and mechanical property after solidifying
It can be excellent;A series of indexs such as dielectric constant, linear shrinkage ratio can satisfy great power LED encapsulating application demand.
To sum up, a specific embodiment of the invention and preferred embodiment are as follows:
Bi-component organic silicon casting glue, including component A and B component:
The component A by vinyl silicone oil, dimethicone, silicon powder, aluminium oxide, aluminium nitride, boron nitride, LSR base rubber,
Platinum catalyst is formed by certain weight ratio mixing,
The B component by vinyl silicone oil, dimethicone, methyl hydrogen siloxane, silicon powder, aluminium oxide, LSR base rubber,
White carbon black, tackifier, inhibitor are by certain weight ratio mixing composition;
The mixing ratio of the A component and B component is 1:1.
In the component A, vinyl silicone oil, dimethicone, silicon powder, aluminium oxide, aluminium nitride, boron nitride, LSR base
The weight ratio of glue, platinum catalyst are as follows: 100:(50~65): (20~30): (5~10): (5~10): (5~10): (20~30):
(0.5~3);
In the B component, vinyl silicone oil, dimethicone, methyl hydrogen siloxane, silicon powder, aluminium oxide, LSR base rubber,
The weight ratio of white carbon black, tackifier, inhibitor are as follows: 100:(50~65): (20~30): (20~30): (5~10): (20~
30): (5~15): (0.1~1): (0.1~3);
It is preferred: micron grade aluminum oxide, nanoscale aluminium nitride and boron nitride mixed fillers and mixing are used in the component A
The shape of filler includes laminal filter, bat wool and ball filler;Mixed fillers total amount described in the bat wool station
5~25%.The machine silica gel glue of the present embodiment is using micron grade aluminum oxide, nanoscale aluminium nitride and boron nitride mixing filling
Mode, improve Embedding Material thermal conductivity to greatest extent in the case where guaranteeing colloid mobile performance.
Preferred: the aluminium oxide, aluminium nitride and boron nitride are provided with there are many grain size specification;A variety of grain size specifications
For large, medium and small three kinds of grain size specifications;The mixed proportion of large, medium and small three kinds of grain size specifications is 10:30:15.Using different-grain diameter, difference
Pattern, different types of heat filling fill casting glue by proper ratio, it is easier to obtain dense accumulation, be formed more thermally conductive
Access, therefore the organic silicon potting adhesive of high heat conductance can be prepared under lower loading.
Preferred: the dosage of the platinum catalyst is less than 24ppm;The vinyl and methyl hydrogen silicon oxygen of the vinyl silicone oil
The molar ratio of the silicon hydrogen-based of alkane is 1:(1~1.2).
It is preferred: also to include fire retardant;The fire retardant is halogen-free flame retardants;Halogen-free flame retardants is aluminium hydroxide, hydrogen-oxygen
Change one of magnesium and zinc borate or a variety of;The halogen-free flame retardants is by surface treatment, and the surface treatment is via organic
Silicon processing.
Preferred: the fire retardant includes inorganic fire retardants and generates the cooperative flame retardant of synergistic effect with inorganic fire retardants
Agent;The inorganic fire retardants is Strong oxdiative aluminium, and the synergistic fire retardant is platinum complex fire retardant.
Although the flame retardant property of halogen-free flameproof organic silicon potting adhesive can be improved in filling inorganic fire retardants, but can damage encapsulating
The physical mechanical property and mobility of glue.The present invention increases its phase with polymer by the surface treatment to inorganic fire retardants
Capacitive;The present invention also passes through synergistic fire retardant, cooperative flame retardant effect is generated with inorganic fire retardants, to reduce inorganic fire retardants
Dosage.
As shown, the preparation process of bi-component organic silicon casting glue disclosed by the invention, comprises the following steps:
(1) preparation of component A;
Vinyl silicone oil, silicon powder, aluminium oxide, aluminium nitride and boron nitride high speed dispersion are mixed;High speed dispersion is mixed
Material afterwards is added in LSR base rubber and mixes with platinum catalyst, dimethicone, deaeration, solidifies up to component A;
(2) preparation of component B;
Vinyl silicone oil, dimethicone and aluminium oxide high speed dispersion are mixed;The mixed material of high speed dispersion is added
Enter in LSR base rubber and mixed with methyl hydrogen siloxane, silicon powder, tackifier, inhibitor and white carbon black, deaeration, solidified up to group
Part B;
(3) component A and component B is uniformly mixed under the action of high speed shear is dispersed by the mass ratio of 1:1, is placed in vacuum
Vacuum defoamation 10 minutes in drying box are subsequently poured into room temperature curing in mold or are heating and curing.
Further, the solidification temperature in the step (3) is 25~100 DEG C.
Preparation process of the invention also includes the preparation of LSR base rubber, and the preparation of the LSR base rubber includes by vinyl silicone oil
With the process of silicon powder vacuum mixing 2h at 130 DEG C in kneader.
The preferred embodiment for the present invention is explained in detail above, but the present invention is not limited to the above embodiments,
Those of ordinary skill in the art within the scope of knowledge, can also make various without departing from the purpose of the present invention
Variation, these variations are related to the relevant technologies well-known to those skilled in the art, these both fall within the protection model of the invention patent
It encloses.
Many other changes and remodeling can be made by not departing from the spirit and scope of the present invention.It should be appreciated that the present invention is not
It is limited to specific embodiment, the scope of the present invention is defined by the following claims.