CN111154452A - Optical cement - Google Patents
Optical cement Download PDFInfo
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- CN111154452A CN111154452A CN202010053991.5A CN202010053991A CN111154452A CN 111154452 A CN111154452 A CN 111154452A CN 202010053991 A CN202010053991 A CN 202010053991A CN 111154452 A CN111154452 A CN 111154452A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J183/00—Adhesives based on 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; Adhesives based on derivatives of such polymers
- C09J183/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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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
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention relates to an optical adhesive, in particular to an optical adhesive made of an organic silicon material. The optical cement comprises the following components in parts by weight: 100 parts of unsaturated organopolysiloxane, 1-30 parts of MQ silicon resin, 1-20 parts of hydroxyl silicone oil, 1-20 parts of hydrogen-containing polysiloxane, 1-10 parts of chain extender, 0.1-5 parts of silane coupling agent, 0.1-5 parts of catalyst and 0.1-5 parts of retarder. The optical adhesive has the characteristics of high transparency, good adhesion, ultraviolet aging resistance, cold and thermal shock resistance and the like.
Description
Technical Field
The invention relates to an optical adhesive, in particular to an optical adhesive made of an organic silicon material.
Background
The optical cement is mainly a special adhesive for bonding transparent optical elements (such as bonding of an ITO glass layer and a glass substrate). The method is widely applied to the electronic fields of mobile phones, computers, televisions and the like. According to the current market, the optical adhesive can be divided into OCA adhesive film and LOCA liquid optical adhesive. The applications of the adhesive have long times, but the adhesive is required to have the performances of colorless transparency, light transmittance of more than 90%, good adhesion and the like. The traditional OCA and LOCA optical cement mainly comprises acrylate or polyurethane modified acrylate, and has the main characteristics of good bonding property, high transparency, outstanding mechanical strength and the like, so that the optical cement has a large amount of application in the electronic field for a long time. However, with the popularization of the application of the acrylate or the modified optical material thereof and the rapid development of electronic products in recent years, the defects of the acrylate are gradually found, and the acrylate material has the problems of easy yellowing, corrosion to an ITO electrode, no cold and heat shock resistance and the like in the use process. The highlighting of these problems is accompanied by an increase in the lifetime of the display screen, and the image display effect thereof gradually decreases. Therefore, a new material which can not only inherit the advantages of the acrylate optical cement but also overcome the disadvantages needs to be developed to meet the high requirements of the market on the material.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the optical adhesive with high transparency, good adhesion, ultraviolet aging resistance and cold and heat shock resistance.
In order to achieve the purpose, the invention adopts the technical scheme that: an optical cement comprises the following components in parts by weight: 100 parts of unsaturated organopolysiloxane, 1-30 parts of MQ silicon resin, 1-20 parts of hydroxyl silicone oil, 1-20 parts of hydrogen-containing polysiloxane, 1-10 parts of chain extender, 0.1-5 parts of silane coupling agent, 0.1-5 parts of catalyst and 0.1-5 parts of retarder.
The optical adhesive is an organic silicon material optical adhesive, and has the characteristics of high transparency, good adhesion, ultraviolet aging resistance, cold and thermal shock resistance and the like.
As a preferred embodiment of the optical cement, the optical cement comprises the following components in parts by weight: 100 parts of unsaturated organopolysiloxane, 5-25 parts of MQ silicon resin, 2-5 parts of hydroxyl silicone oil, 5-8 parts of hydrogen-containing polysiloxane, 3-5 parts of chain extender, 0.5 part of silane coupling agent, 0.5-1 part of catalyst and 0.2-0.5 part of retarder.
Preferred embodiments of the optical adhesive according to the present invention include at least one of the following (a) to (g):
(a) the molecular chain of the unsaturated organopolysiloxane contains more than two alkenyl groups directly bonded to silicon atoms, and the unsaturated organopolysiloxane has the following average unit structural formula: raSiO(4-a)/2(ii) a Wherein R is an alkyl group, alkoxy group, aryl group, aralkyl group or alkenyl group having 1 to 8 carbon atoms; a is 1.5-2.8; preferably, a is a positive number between 1.8 and 2.3.
(b) The MQ silicone resin contains more than 1 alkenyl group bonded to a silicon atom, and has the following average unit structural formula: (RSiO)1/2)b(SiO4/2) c; wherein R is an alkyl group, an aryl group, an alcohol group, an alkenyl group, an alkoxy group, or an epoxy group independently having 1 to 8 carbon atoms; b/c is 0.5-1.5; preferably, R is a methyl, ethyl, propyl, phenyl, naphthyl, vinyl, allyl, chloropropyl, 3,3, 3-trifluoropropyl, (meth) acryloyl, isocyanate, hydrogen, hydroxyl, epoxy, or γ -glycidoxypropyl group; preferably, b/c is 0.7-1.3;
(c) the molecular chain of the hydrogen-containing polysiloxane contains more than 3 hydrogen atoms bonded with silicon atoms;
(d) the general structural formula of the chain extender is HRR 'SiO (RR' SiO)mSi RR ' H, wherein R, R ' is (R and R ' are the same or different from each other) an alkyl group, an aryl group or an aralkyl group having 1 to 8 carbon atoms, and m is a natural number; preferably R, R' is methyl, ethyl, propyl, phenyl, benzyl, chloromethyl, gamma-chloropropyl, 3,3, 3-trifluoropropyl, cyanoethyl; more preferably R, R' is methyl, phenyl or a combination thereof.
(e) The silane coupling agent is at least one of methyltrimethoxysilane, vinyl trimethoxysilane, vinyl triethoxysilane, gamma-glycidoxypropyltrimethoxysilane and gamma-methacryloxypropyltrimethoxysilane;
(f) the catalyst is mainly a compound of noble metals such as platinum, palladium, rhodium and the like, preferably a platinum compound; more preferably, the catalyst is at least one of chloroplatinic acid, a coordination compound of platinum with an olefin, a vinylsiloxane or an acetylenic compound, a coordination compound of platinum with a primary or secondary amine, a coordination compound of platinum with an organic phosphorus;
(g) the retarder is alcohol derivative with carbon-carbon triple bond or siloxane containing alkenyl and polysiloxane; preferably, the retarder is at least one of 3-methyl-1-butyn-3-ol, 1-acetylene-1-cyclohexanol, phenylbutynol, tetramethyldivinyldisiloxane, 1,3,5,7-, tetramethylcyclotetrasiloxane and polyvinyl silicone oil.
In the unsaturated organopolysiloxane, the position of the alkenyl group is not limited, and may be located at both ends of the molecular chain or at any position in the middle of the molecular chain. The alkenyl group is preferably a vinyl group, and the R group other than the alkenyl group is preferably a methyl group or a phenyl group. R in the average unit structural formula of the unsaturated organopolysiloxane represents substituted or unsubstituted carbon atoms directly bonded to silicon atoms, which are the same or different from each other, and preferably, R is an alkyl group such as methyl, ethyl, propyl, butyl, pentyl, hexyl, etc., an alkoxy group such as methoxy, ethoxy, n-propoxy, etc., an aryl group such as phenyl, tolyl, naphthyl, etc., an aralkyl group such as benzyl, phenethyl, etc., an alkenyl group such as vinyl, allyl, propenyl, methallyl, butenyl, hexenyl, etc., or a hydrocarbon group in which a part or all of hydrogen atoms of these groups are substituted with halogen, cyano, carbonyl, etc., for example, chloromethyl, γ -chloropropyl, 3,3, 3-trifluoropropyl, cyanoethyl, etc. The molecular weight of the unsaturated organopolysiloxane is not particularly limited, and a liquid organopolysiloxane having a low viscosity to a raw gel organopolysiloxane having a high viscosity can be used.
The ratio of b to c in the above MQ silicone resin is referred to as MQ ratio, and the ratio of b to c is preferably within the scope of the present invention but is not limited thereto.
The above-mentioned hydrogenpolysiloxanes, mainly polysiloxanes used in systems crosslinked with alkenyl groups, are referred to as "active hydrogens". Therefore, the molecular chain at least contains three hydrogen atoms directly bonded with silicon atoms, and the position of the active hydrogen atoms is not limited, and can be positioned at the tail end of the molecular chain or positioned at the lateral position of the molecular chain. The other groups attached to the silicon atom may be substituted or unsubstituted monovalent hydrocarbon groups such as methyl, ethyl, propyl, phenyl, gamma-chloropropyl, 3,3, 3-trifluoropropyl, and the like, which may be present alone or in combination with each other, and are preferably methyl and phenyl. The molecular structure of the hydrogenpolysiloxane may be linear, branched, cyclic, or a combination thereof.
The chain extender acts primarily to react with the alkenyl groups, linking more of the unsaturated polysiloxane molecular chains together, increasing their effective molecular weight and the distance between potential crosslinking points. Therefore, the molecular chain contains only two hydrogen atoms directly bonded to silicon atoms. The hydrogen atoms are positioned at the ends of the molecular chain. R and R' in the chain extender represent the same or different substituted or unsubstituted carbon atoms directly bonded to the silicon atom.
In the present invention, the catalyst is used to catalyze hydrosilylation. Preferably, the platinum content in the catalyst is 300-20000 ppm.
The content of alkenyl groups in the unsaturated organopolysiloxane is not limited, and as a preferred embodiment of the optical glue of the present invention, the weight percentage of alkenyl groups in the unsaturated organopolysiloxane is 0.01 to 3%; for ease of processing, the viscosity of the unsaturated organopolysiloxane is from 50 to 2000000mpa.s (measured at 25 ℃).
The hydroxyl silicone oil is straight-chain polydimethylsiloxane with two ends blocked by hydroxyl groups on a molecular chain, also called 107 glue, the viscosity of the hydroxyl silicone oil is not limited, and as a preferred embodiment of the optical glue, the viscosity of the hydroxyl silicone oil is 500-100000mpa.s (tested at 25 ℃).
The viscosity and hydrogen content of the hydrogenpolysiloxane are not limited, and as a preferred embodiment of the optical glue of the invention, the viscosity of the hydrogenpolysiloxane is 5-1000mpa.s (tested at 25 ℃), and the weight percentage of hydrogen in the hydrogenpolysiloxane is 0.01-1.6%.
As a preferred embodiment of the optical glue according to the invention, the viscosity of the chain extender is 5-1000mpa.s (measured at 25 ℃).
In a preferred embodiment of the optical cement of the present invention, the molar ratio of active hydrogen to alkenyl in the optical cement is 0.1 to 3. Wherein the ratio of active hydrogen to alkenyl is referred to as the silicon to hydrogen ratio.
As a preferred embodiment of the optical cement of the invention, the optical cement further comprises at least one of an antistatic agent and a flame retardant.
As a preferred embodiment of the optical cement of the present invention, the antistatic agent is at least one of imidazolium salt, pyridinium salt, ammonium salt and perchlorate; the flame retardant is an organic phosphorus compound.
The preparation method of the optical cement comprises the following steps: and uniformly mixing all the components in the optical adhesive according to a ratio to obtain the optical adhesive. In the preparation of the optical cement of the present invention, any mixing technique and apparatus known in the art, such as planetary stirring, kneading stirring, high-speed dispersion, etc., can be used at room temperature.
Compared with the prior art, the invention has the beneficial effects that: the invention provides an organic silicon material optical cement which has the characteristics of high transparency, good adhesion, ultraviolet aging resistance, cold and thermal shock resistance and the like.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
The viscosity was measured at 25 ℃ for each example.
Example 1
In an embodiment of the optical cement of the present invention, the material of the optical cement in this embodiment is composed of the following components:
unsaturated organopolysiloxane: 100 parts of vinyl-terminated polydimethylsiloxane (viscosity: 5000mpa. s, vinyl content: 0.16%)
MQ silicone resin: 25 parts of MQ type methyl vinyl silicone resin (molecular weight: 6000, vinyl content: 0.5%)
Hydroxyl silicone oil: 3 parts of hydroxyl silicone oil (viscosity: 10000mpa.s)
Hydrogen-containing polysiloxane: 5 parts of hydrogenpolysiloxane (viscosity: 150mpa. s, hydrogen content: 0.6%)
Chain extender: 5 parts of a hydrogen-terminated polydimethylsiloxane (viscosity: 100mpa.s)
Silane coupling agent: 0.5 part of gamma-methacryloxypropyltrimethoxysilane
Catalyst: 0.5 part of a platinum-tetramethyldivinyldisiloxane Complex (platinum content: 2000ppm)
A retarder: 0.2 part of 3-methyl-1-butyn-3-ol
The preparation method of the optical cement comprises the following steps: and dispersing the components uniformly by using a planetary stirrer to obtain the OCA optical cement of the organosilicon material.
Example 2
In an embodiment of the optical cement of the present invention, the material of the optical cement in this embodiment is composed of the following components:
unsaturated organopolysiloxane: 100 parts of trimethyl-terminated methylvinylsiloxane-dimethylsiloxane copolymer (viscosity: 10000mpa. s, vinyl content: 0.5%)
MQ silicone resin: 10 parts of MQ type methyl vinyl silicone resin (molecular weight: 5000, vinyl content: 2.0%)
Hydroxyl silicone oil: 5 parts of hydroxyl silicone oil (viscosity: 50000mpa.s)
Hydrogen-containing polysiloxane: 5 parts of hydrogenpolysiloxane (viscosity: 150mpa. s, hydrogen content: 0.6%)
Chain extender: 5 parts of a hydrogen-terminated polydimethylsiloxane (viscosity: 100mpa.s)
Silane coupling agent: 0.5 part of gamma-methacryloxypropyltrimethoxysilane
Catalyst: 1.0 part of a platinum-tetramethyldivinyldisiloxane Complex (platinum content: 2000ppm)
A retarder: 0.5 part of 3-methyl-1-butyn-3-ol
The preparation method of the optical cement in this example is the same as that in example 1.
Example 3
In an embodiment of the optical cement of the present invention, the material of the optical cement in this embodiment is composed of the following components:
unsaturated organopolysiloxane: 100 parts of vinyl-terminated polymethylphenylsiloxane-dimethylsiloxane copolymer (viscosity: 3000mpa. s, vinyl content: 0.17%)
MQ silicone resin: 10 parts of MQ type methyl phenyl vinyl silicone resin (molecular weight: 6000, vinyl content: 1.0%)
Hydroxyl silicone oil: 2 parts of hydroxyl silicone oil (viscosity: 10000mpa.s)
Hydrogen-containing polysiloxane: 8 parts of hydrogenous polymethylphenylsiloxane (viscosity: 150mpa. s, hydrogen content: 0.5%)
Chain extender: 5 parts of a hydrogen-terminated methylphenylsiloxane-dimethylsiloxane copolymer (viscosity: 300mpa. s)
Silane coupling agent: 0.5 part of gamma-methacryloxypropyltrimethoxysilane
Catalyst: 0.5 part of platinum-tetramethyldivinyldisiloxane Complex (platinum content: 8000ppm)
A retarder: 0.2 part of 3-methyl-1-butyn-3-ol
The preparation method of the optical cement in this example is the same as that in example 1.
Example 4
In an embodiment of the optical cement of the present invention, the material of the optical cement in this embodiment is composed of the following components:
unsaturated organopolysiloxane: 100 parts of trimethyl-terminated methylvinylsiloxane-dimethylsiloxane copolymer (viscosity: 50000mpa. s, vinyl content: 1.0%)
MQ silicone resin: 5 parts of MQ type methyl phenyl vinyl silicone resin (molecular weight: 8000, vinyl content: 0.5%)
Hydroxyl silicone oil: 2 parts of hydroxyl silicone oil (viscosity: 10000mpa.s)
Hydrogen-containing polysiloxane: 5 parts of hydrogenous polymethylphenylsiloxane (viscosity: 150mpa. s, hydrogen content: 0.6%)
Chain extender: 3 parts of a hydrogen-terminated methylphenylsiloxane-dimethylsiloxane copolymer (viscosity: 50mpa.s)
Silane coupling agent: 0.5 part of gamma-methacryloxypropyltrimethoxysilane
Catalyst: 0.5 part of a platinum-tetramethyldivinyldisiloxane Complex (platinum content: 2000ppm)
A retarder: 0.2 part of 3-methyl-1-butyn-3-ol
The preparation method of the optical cement in this example is the same as that in example 1.
Example 5
In an embodiment of the optical cement of the present invention, the material of the optical cement in this embodiment is composed of the following components:
unsaturated organopolysiloxane: 100 parts of trimethyl-terminated methylvinylsiloxane-dimethylsiloxane copolymer (viscosity: 50mpa. s, vinyl content: 3%)
MQ silicone resin: 1 part of MQ type methyl phenyl vinyl silicone resin (molecular weight: 8000, vinyl content: 0.5%)
Hydroxyl silicone oil: 20 parts of hydroxyl silicone oil (viscosity: 500mpa.s)
Hydrogen-containing polysiloxane: 1 part of hydrogenous polymethylphenylsiloxane (viscosity: 5mpa. s, hydrogen content: 1.6%)
Chain extender: 10 parts of a hydrogen-terminated methylphenylsiloxane-dimethylsiloxane copolymer (viscosity: 5mpa.s)
Silane coupling agent: 5 parts of gamma-methacryloxypropyltrimethoxysilane
Catalyst: 0.1 part of a platinum-tetramethyldivinyldisiloxane Complex (platinum content: 2000ppm)
A retarder: 0.1 part of 3-methyl-1-butyn-3-ol
The preparation method of the optical cement in this example is the same as that in example 1.
Example 6
In an embodiment of the optical cement of the present invention, the material of the optical cement in this embodiment is composed of the following components:
unsaturated organopolysiloxane: 100 parts of trimethyl-terminated methylvinylsiloxane-dimethylsiloxane copolymer (viscosity: 2000000mpa.s, vinyl content: 0.01%)
MQ silicone resin: 30 parts of MQ type methyl phenyl vinyl silicone resin (molecular weight: 8000, vinyl content: 0.5%)
Hydroxyl silicone oil: 1 part of hydroxyl silicone oil (viscosity: 100000mpa.s)
Hydrogen-containing polysiloxane: 20 parts of hydrogenous polymethylphenylsiloxane (viscosity: 1000mpa. s, hydrogen content: 0.01%)
Chain extender: 1 part of a hydrogen-terminated methylphenylsiloxane-dimethylsiloxane copolymer (viscosity: 1000mpa. s)
Silane coupling agent: 0.1 part of gamma-methacryloxypropyltrimethoxysilane
Catalyst: 5 parts of a platinum-tetramethyldivinyldisiloxane Complex (platinum content: 2000ppm)
A retarder: 5 parts of 3-methyl-1-butyn-3-ol
The preparation method of the optical cement in this example is the same as that in example 1.
Comparative example 1
In an embodiment of the optical cement of the present invention, the material of the optical cement in this embodiment is composed of the following components:
unsaturated organopolysiloxane: 100 parts of trimethyl-terminated methylvinylsiloxane-dimethylsiloxane copolymer (viscosity: 50000mpa. s, vinyl content: 1.0%)
MQ silicone resin: 35 parts of MQ type methyl phenyl vinyl silicone resin (molecular weight: 8000, vinyl content: 0.5%)
Hydroxyl silicone oil: 0.5 part of hydroxyl silicone oil (viscosity: 10000mpa.s)
Hydrogen-containing polysiloxane: 0.5 part of hydrogenous polymethylphenylsiloxane (viscosity: 150mpa. s, hydrogen content: 0.6%)
Chain extender: 12 parts of a hydrogen-terminated methylphenylsiloxane-dimethylsiloxane copolymer (viscosity: 50mpa. s)
Silane coupling agent: 0.5 part of gamma-methacryloxypropyltrimethoxysilane
Catalyst: 5 parts of a platinum-tetramethyldivinyldisiloxane Complex (platinum content: 2000ppm)
A retarder: 0.2 part of 3-methyl-1-butyn-3-ol
The preparation method of the optical cement in this example is the same as that in example 1.
Comparative example 2
In an embodiment of the optical cement of the present invention, the material of the optical cement in this embodiment is composed of the following components:
unsaturated organopolysiloxane: 100 parts of trimethyl-terminated methylvinylsiloxane-dimethylsiloxane copolymer (viscosity: 50000mpa. s, vinyl content: 1.0%)
MQ silicone resin: 0.5 part of MQ type methyl phenyl vinyl silicone resin (molecular weight: 8000, vinyl content: 0.5%)
Hydroxyl silicone oil: 25 parts of hydroxy silicone oil (viscosity: 10000mpa.s)
Hydrogen-containing polysiloxane: 22 parts of hydrogenous polymethylphenylsiloxane (viscosity: 150mpa. s, hydrogen content: 0.6%)
Chain extender: 0.5 part of a hydrogen-terminated methylphenylsiloxane-dimethylsiloxane copolymer (viscosity: 50mpa. s)
Silane coupling agent: 0.5 part of gamma-methacryloxypropyltrimethoxysilane
Catalyst: 5 parts of a platinum-tetramethyldivinyldisiloxane Complex (platinum content: 2000ppm)
A retarder: 0.2 part of 3-methyl-1-butyn-3-ol
The preparation method of the optical cement in this example is the same as that in example 1.
Effect example 1
The performance of the optical cement of examples 1 to 6 and comparative examples 1 and 2 was evaluated by using the following method:
1. light transmittance
The test is carried out according to the method provided by ASTM D1003-2013, and the light transmittance is required to be more than or equal to 90 percent.
2. Yellowing index
Color coordinate b was measured according to the method provided in ASTM D1925/C2*Value of (a), requirement b*＜0.7。
3. Haze degree
Testing was performed according to the method provided in ASTM D1003-2013, requiring haze < 0.5%.
4. Shear strength
The bonding strength of the glass-glass is tested according to the method provided by GB/T7124-86, and the bonding strength is required to be more than or equal to 2 MPa.
5. Resisting alternating damp heat
The cold and hot impact at humidity was tested according to the method provided in GB/T2423.4-1993, requiring no abnormalities after the test.
6. Resistance to salt fog
The test was carried out according to the method provided in GB/T2423.17-1993, and it was required that no abnormalities were observed after the test.
7. High temperature high humidity aging
And (3) putting the cured OCA optical cement into a constant temperature and humidity box with the temperature of 85 ℃ and the humidity of 85% for 1000h, wherein the surface is required to be free of abnormality.
The test results are shown in table 1 below.
TABLE 1
From the above test results, it can be seen that the optical adhesives described in examples 1 to 6 have significant properties of light transmittance, yellowing resistance, alternating damp and heat resistance, etc., thereby proving the rationality and practical effect of the solution proposed by the present invention. Among them, the optical adhesives of examples 1-4 have better light transmittance, yellowing resistance, alternate moist heat resistance and other properties than those of the optical adhesives of examples 5 and 6. Moreover, the composition ratios of the optical adhesives described in comparative examples 1 and 2 were out of the range of the present invention, and the properties were remarkably deteriorated.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the protection scope of the present invention, and although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The optical cement is characterized by comprising the following components in parts by weight: 100 parts of unsaturated organopolysiloxane, 1-30 parts of MQ silicon resin, 1-20 parts of hydroxyl silicone oil, 1-20 parts of hydrogen-containing polysiloxane, 1-10 parts of chain extender, 0.1-5 parts of silane coupling agent, 0.1-5 parts of catalyst and 0.1-5 parts of retarder.
2. The optical cement as claimed in claim 1, which comprises the following components in parts by weight: 100 parts of unsaturated organopolysiloxane, 5-25 parts of MQ silicon resin, 2-5 parts of hydroxyl silicone oil, 5-8 parts of hydrogen-containing polysiloxane, 3-5 parts of chain extender, 0.5 part of silane coupling agent, 0.5-1 part of catalyst and 0.2-0.5 part of retarder.
3. The optical paste according to claim 1, wherein at least one of the following (a) to (g):
(a) the molecular chain of the unsaturated organopolysiloxane contains more than two alkenyl groups bonded with silicon atoms, and the unsaturated organopolysiloxane has the following average unit structural formula: raSiO(4-a)/2(ii) a Wherein R is an alkyl group, alkoxy group, aryl group, aralkyl group or alkenyl group having 1 to 8 carbon atoms; a is 1.5-2.8;
(b) the MQ silicone resin contains more than 1 alkenyl group bonded to a silicon atom, and has the following average unit structural formula: (RSiO)1/2)b(SiO4/2) c; wherein R is an alkyl group, an aryl group, an alcohol group, an alkenyl group, an alkoxy group, or an epoxy group independently having 1 to 8 carbon atoms; b/c is 0.5-1.5;
(c) the molecular chain of the hydrogen-containing polysiloxane contains more than 3 hydrogen atoms bonded with silicon atoms;
(d) the general structural formula of the chain extender is HRR 'SiO (RR' SiO)mSi RR 'H, wherein R, R' is alkyl, aryl or aralkyl with 1-8 carbon atoms, and m is a natural number;
(e) the silane coupling agent is at least one of methyltrimethoxysilane, vinyl trimethoxysilane, vinyl triethoxysilane, gamma-glycidoxypropyltrimethoxysilane and gamma-methacryloxypropyltrimethoxysilane;
(f) the catalyst is at least one of chloroplatinic acid, a coordination compound of platinum and olefin, vinyl siloxane or an acetylene compound, a coordination compound of platinum and primary amine or secondary amine, and a coordination compound of platinum and organic phosphorus;
(g) the retarder is at least one of 3-methyl-1-butine-3-alcohol, 1-acetylene-1-cyclohexanol, phenylbutynol, tetramethyl divinyl disiloxane, 1,3,5,7-, tetramethyl cyclotetrasiloxane and polyvinyl silicone oil.
4. The optical adhesive according to claim 3, wherein the weight percentage of alkenyl groups in the unsaturated organopolysiloxane is 0.01 to 3%; the viscosity of the unsaturated organopolysiloxane is 50 to 2000000 mpa.s.
5. The optical cement as claimed in claim 1, wherein the hydroxyl silicone oil has a viscosity of 500-100000 mpa.s.
6. The optical adhesive according to claim 1, wherein the hydrogenpolysiloxane has a viscosity of 5 to 1000mpa.s, and the weight percentage of hydrogen in the hydrogenpolysiloxane is 0.01 to 1.6%.
7. An optical cement as claimed in claim 1, wherein said chain extender has a viscosity of 5 to 1000 mpa.s.
8. The optical glue of claim 1, wherein the molar ratio of active hydrogen to alkenyl groups in the glue is in the range of 0.1 to 3.
9. An optical glue as claimed in any one of claims 1 to 8 further comprising at least one of an antistatic agent and a flame retardant.
10. The optical cement according to claim 9, wherein the antistatic agent is at least one of imidazolium salt, pyridinium salt, ammonium salt and perchlorate; the flame retardant is an organic phosphorus compound.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010053991.5A CN111154452A (en) | 2020-01-17 | 2020-01-17 | Optical cement |
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| CN112646543A (en) * | 2020-12-22 | 2021-04-13 | 深圳斯多福新材料科技有限公司 | Organic silicon liquid optical cement and preparation method thereof |
| CN116083046A (en) * | 2022-12-11 | 2023-05-09 | 湖北兴瑞硅材料有限公司 | Optical packaging adhesive and preparation method thereof |
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