TW201927889A - Dry diallyl resin composition and LED reflector made thereof - Google Patents

Abstract

A dry diallyl resin composition for producing an LED reflector, comprises a diallyl resin; a crosslinking agent; a polymerization initiator; a white pigment; a release agent; and a reinforcing material. The dry diallyl resin composition is solid in a temperature range of 40 DEG C. or less and can be processed into a pellet form or an ingot form to facilitate the subsequent production of the LED reflector by injection molding or transfer molding.

Description

Dry type diallyl resin composition and LED reflection cup made of same

The present invention relates to a diallyl resin composition, and more particularly to a dry diallyl resin composition for manufacturing LED reflective cups.

Light-emitting diodes (LEDs) have the advantages of high efficiency, long life, not easy to break, fast response, high reliability and other traditional light sources, which have gradually developed into a very common lighting equipment in recent years. Because LEDs generate high temperatures when they emit light, LED reflectors need to be made of heat-resistant materials. In addition, some materials will gradually change color in a long-term high-temperature environment, such as from white to yellow, which will affect the light reflection efficiency of the reflection cup. Therefore, the material of the reflection cup is also preferably to prevent deterioration and discoloration due to heat. Among the materials currently used to manufacture LED reflective cups, nylon (Nylon) is a thermoplastic material that can be manufactured by injection molding, but its heat resistance is poor. In addition, epoxy resin is a thermosetting material, but its cost is high, and it cannot be manufactured by injection molding. Since traditional materials still have different usage problems, if they can provide a material for manufacturing LED reflector cups that have sufficient heat resistance and can be manufactured in different ways such as injection molding or reinjection molding, it will be very useful. Industrial value.

The present invention provides a dry diallyl resin composition for making LED reflector cups, which comprises: diallyl resin; a crosslinking agent; a polymerization initiator; a white pigment; a release agent; and a reinforcing material. Wherein, the dry diallyl resin composition is solid in a temperature range of 40 ° C or less, easy to store, and can be processed into a granular or ingot shape.

In an embodiment of the present invention, the diallyl resin used is poly diallyl phthalate. In another embodiment, poly (1,2-cyclohexanediacid diallyl ester) polymerized by using a structural compound shown in formula (1) is used. In addition, in other embodiments, the above two may be used in combination. (1)

In an embodiment of the present invention, the cross-linking agent is 100 parts by weight of the diallyl resin, and the blending amount of the cross-linking agent is 10 parts by weight or less. The cross-linking agent of the present invention can use diallyl phthalate monomer, diallyl phthalate prepolymer, 1,2-cyclohexanediacryl diallyl monomer, 1, 2-cyclohexanedioic acid diallyl ester prepolymer, styrene monomer alone, or a combination of two or more.

In one embodiment of the present invention, the white pigment is selected from any one or a combination of titanium oxide, barium titanate, strontium titanate, aluminum oxide, magnesium oxide, zinc oxide, and barium sulfate.

In one embodiment of the present invention, the blending amount of the white pigment is within a range of 100 to 300 parts by weight relative to 100 parts by weight of the diallyl resin.

In one embodiment of the present invention, the average particle diameter of the white pigment is 2.0 μm or less.

In an embodiment of the present invention, the reinforcing material is glass fiber, and the blending amount of the reinforcing material is 10 to 200 parts by weight relative to 100 parts by weight of the diallyl resin.

In an embodiment of the present invention, the present invention also provides an LED reflector cup formed by using the aforementioned dry diallyl resin composition. The material characteristics of such a reflection cup allow it to be formed by injection molding or transfer molding.

In the present invention, by using the selection and matching of a diallyl resin and a cross-linking agent, a novel thermosetting material that is solid at room temperature is obtained, and has high fluidity in the molding process, which is beneficial to different forms of Processed into an LED reflector.

The dry diallyl resin composition of the present invention is used to make LED reflector cups or other similar components. The dry diallyl resin composition mainly comprises: diallyl resin; a cross-linking agent; a polymerization initiator; a white pigment; and a release agent. ; And reinforcing materials. Among them, the dry diallyl resin composition is solid in a temperature range of 40 ° C. or less, and can be processed into a granular or ingot form, so as to facilitate the subsequent production of LED reflection cups by injection molding or reinjection molding.

Each component of the dry diallyl resin composition of the present invention will be further described below.

Diallyl resin: In the present invention, poly (diallyl phthalate) or poly (1,2-cyclohexanediene diene) polymerized with a structural compound represented by the following formula (1) Propyl ester), or a combination of the two, but the diallyl resin of the present invention is not limited thereto. (1)

Cross-linking agent: The cross-linking agent of the present invention can be used, but not limited to, diallyl phthalate monomer, diallyl phthalate prepolymer, and diallyl 1,2-cyclohexanediacrylate Base ester monomer, 1,2-cyclohexanedioic acid diallyl prepolymer, and styrene monomer can be used alone or in combination of two or more. The ratio of diallyl resin to crosslinking agent in the resin is in the range of 99/1 to 50/50 in terms of weight ratio. Furthermore, in the case of using a cross-linking agent, if the compounding amount of the cross-linking agent is increased, it cannot be a solid dry diallyl resin composition at normal temperature. Therefore, in 100 weight parts of diallyl resin, The blending amount of the crosslinking agent is preferably 10 parts by weight or less. If no cross-linking agent is used, the fluidity of the composition will be deteriorated, and the processability required for the manufacturing process will not be satisfied.

Initiator: As the diallyl resin for the LED reflector cup of the present invention, a thermal decomposition type organic peroxide generally used for an unsaturated resin composition can be used as a polymerization initiator. Common peroxides that can be used as initiators are: tert-butylperoxy-2-ethylhexyl monocarbonate, 1,1-bis (third-butylperoxy) -3,3,5-trimethylamine Cyclohexane, 1,1-bis (third butyl peroxy) -3,3,5-trimethylcyclohexane, third butyl peroxyoctanoate, benzamidine peroxide, methylethyl Ketone peroxide, acetone acetone peroxide, third butyl peroxybenzoate, dicumyl peroxide, etc., tert-butyl peroxyisopropyl carbonate, etc., the above peroxides can be separately It can also be used in combination of two or more kinds. Among these, it is preferable to use an organic peroxide having a temperature of 90 ° C. or higher for a period of 10 hours and a half life. The types of each of the above initiators are merely examples, and are not intended to limit the present invention.

White pigment: Because the LED reflection cup needs to be white and have high reflectivity, it is necessary to add a suitable white pigment. In the present invention, any one of titanium oxide, barium titanate, strontium titanate, alumina, magnesium oxide, zinc oxide, and barium sulfate can be used as the white pigment, and anatase titanium oxide and gold can be used as the titanium oxide. The rutile-type titanium oxide and brucite-type titanium oxide can be appropriately selected from rutile-type titanium oxide, alumina, barium titanate, etc., which have better thermal stability, and are not particularly limited. The optimal particle size of the white pigment is 2.0 μm or less, the most suitable range is 0.1 to 1.0 μm, and the more preferable range is 0.2 to 0.7 μm. The average particle diameter is mainly measured by a laser diffraction scattering method or the like. The types of the above white pigments are merely examples, and are not intended to limit the present invention.

In the present invention, with respect to 100 parts by weight of the diallyl resin, the blending amount of the white pigment is preferably 100 parts by weight or more, and the most suitable ratio is in the range of 100 to 300 parts by weight.

Reinforcing material: In addition to the white pigment, in order to obtain the relevant characteristics required for the LED reflector, the diallyl resin composition of the present invention can be appropriately blended with other materials within the range that does not hinder the fluidity and optical characteristics of the composition. Inorganic filling ingredients. Such inorganic fillers include oxides and their hydrates, hollow particles, etc. as reinforcing materials for this material, as long as they are generally used for BMC (Bulk Molding Compounds) and SMC (Sheet Molding). Users of reinforcing materials such as FRP (Fiber Reinforced Plastics), such as compounds, can be used without limitation. As such reinforcing materials, there may be, but are not limited to, glass fiber, Vinylon fiber, aramid fiber, polyester fiber, Wollastonite, potassium titanate whisker), and among these materials, the use of glass fiber is a quite suitable choice. The glass fiber used in the present invention may be, but is not limited to, for example, E glass (alkali-free glass for electrical use), C glass (alkali-containing glass for chemical use), and A glass (glass for acid resistance) which are made of silicate glass and borosilicate glass ), S glass (high strength glass) and other glass fibers, or other glass fibers that can be used to make long fibers (rovings) and short fibers (chopped strands). A material obtained by subjecting the glass fiber to a surface treatment may be used. The blending amount of the reinforcing material is preferably 10 to 200 parts by weight, more preferably 10 to 100 parts by weight, and even more preferably 20 to 80 parts by weight with respect to 100 parts by weight of the diallyl resin. By using a reinforcing material under these conditions, it is possible to produce an LED reflector with excellent strength characteristics, suppressed curing shrinkage, and excellent reflectance.

Mold release agent: As the mold release agent of the present invention, waxes such as fatty acids, fatty acid metal salts, and minerals that are generally used in thermosetting resins can be used, but particularly suitable fatty acids having excellent heat discoloration resistance can be suitably used. Based, fatty acid metal salt based release agent. The release agent used in the present invention can be specifically selected but not limited to release agents such as stearic acid, zinc stearate, aluminum stearate, calcium stearate, etc., which can be used alone or in combination. the above. In this invention, a mold release agent is mix | blended in the range of 4-15 weight part with respect to 100 weight part of resins. When the compounding quantity of a mold release agent exists in this range, a favorable mold release property and outstanding external appearance can coexist, but it does not limit this invention.

In the present invention, in addition to these formulation ingredients, a hardening catalyst and a polymerization inhibitor, a coupling agent, a coloring agent, a tackifier, and other organic additives that can adjust the hardening conditions of the resin may be added as needed. Inorganic additives.

One example of the manufacturing process of the diallyl resin composition for LED reflector cups is as follows: According to the ingredients listed in Table 1, weigh according to the weight, stir and mix uniformly, use a kneading extruder to perform dispersion mixing, and set the heating temperature of the machine The mixture is cooled and pulverized at a temperature between 50 ° C and 90 ° C, and then granulated to produce a granular dry resin composition, which can be applied to injection molding. If the injection molding process is to be performed, the pulverized composition is further sieved to remove the excessively large particle size, and then an ingot-shaped finished product is prepared by a tableting machine. This embodiment is not intended to limit the present invention.

In some examples as listed in Table 1, the materials used are as follows: Poly (1,2-cyclohexanedioic acid diallyl ester): product of Osaka Soda. Polyallyl phthalate: product of Osaka Soda. Crosslinking agent: diallyl phthalate monomer, product of Osaka Soda. Polymerization initiator: tert-butylperoxy-2-ethylhexyl monocarbonate, a product of Juntai Company. White pigment: Titanium dioxide, Tioxide R-TC30, Huntsman. Release agent: Zinc stearate, products of Huanqi Company. Reinforcing material: glass fiber (3.2mm), manufactured by Taiwan Glass Fiber Co., code 101C. Table 1 Unit: grams

The products of the above examples were evaluated by the following evaluation methods, and the results are shown in Table 1.

Injection formability:

Using an injection molding machine (Baisu Corporation, 35 tons, a thermosetting injection molding machine), the compositions of the examples and comparative examples shown in Table 1 were prepared under conditions of a mold temperature of 170 ° C and a curing time of 60 seconds. Three-point bending test piece according to ASTM D790, and actual forming evaluation was performed visually. Good results are marked as ○, and bad results are marked as ╳. The results are shown in Table 1.

Rejectability:

Using the injection molding machine (25 tons, plunger-type injection molding machine), the compositions of the examples and comparative examples shown in Table 1 were prepared under conditions of a mold temperature of 170 ° C, a curing time of 60 seconds, and a pressure of 50 kg / cm2. Round test pieces for whiteness and reflectance testing with a diameter of 50 mm and a thickness of 3 mm were formed, and actual forming evaluation was performed visually. Good results were recorded as ○, and poor results were recorded as ╳. The results are shown in Table 1.

Spiral Flow Length:

Using a standard spiral flow mold (the cross-sectional dimension of the sample is 1.3X 2.5mm), the composition of the examples and comparative examples shown in Table 1 was performed at a molding temperature of 170 ° C and a molding pressure of 50 kg / cm2, and the flow was measured. length. A flow length of 10 inches or more was recorded as ○, and a flow length of less than 10 inches was recorded as ╳. The results are shown in Table 1.

BaiDu:

Using the injection molding machine (25 tons, plunger type injection molding machine), the compositions of the examples and comparative examples shown in Table 1 were made into a diameter of 50 mm and a thickness of 3 mm under the conditions of a mold temperature of 170 ° C and a curing time of 60 seconds. The whiteness test uses a circular test piece to measure the whiteness L * value with a handheld colorimeter (BYK Gardner 6830).

Reflectivity:

Using the injection molding machine (25 tons, plunger type injection molding machine), the compositions of the examples and comparative examples shown in Table 1 were made into a diameter of 50 mm and a thickness of 3 mm under the conditions of a mold temperature of 170 ° C and a curing time of 60 seconds. For the reflectance test, a circular test piece was used to measure the reflectance of the piece at a wavelength of 460 nm with a spectrophotometer (Konica, CM-3600A).

Evaluation results:

In the examples, a diallyl resin composition which can be applied to the use of LED reflection cup materials has been developed, and good results have been obtained in terms of injection moldability, transfer moldability, flowability, and optical properties.

In Comparative Example 1 in which no cross-linking agent was used, the composition had poor moldability due to the lack of a small-molecular-weight substance that promoted flow. Although the required optical characteristics were obtained, the processability requirements could not be met.

In Comparative Example 2 in which the amount of the white pigment (titanium dioxide) exceeds the amount of the diallyl resin by 300% or more, the excessive amount of the filler leads to a decrease in fluidity. Although the required optical characteristics can be obtained, the processability cannot be met .

In Comparative Example 3 in which the amount of the reinforcing material exceeded 200% of the amount of the diallyl resin, the excessive amount of the filler caused a decrease in fluidity, the optical properties could not be tested because it could not be molded, and the processability requirements could not be met.

In summary, through the use of diallyl resin with a cross-linking agent, the present invention provides a dry, high-flow thermosetting material, which can be manufactured by injection molding or reinjection molding. Nylon has excellent heat resistance, lower cost than epoxy resin, and is easier to process and manufacture, so it has great industrial value. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications and retouching without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall be determined by the scope of the attached patent application.

Claims (10)

A dry diallyl resin composition used to make an LED reflector cup, comprising: diallyl resin; a cross-linking agent; a polymerization initiator; a white pigment; a release agent; and a reinforcing material, wherein the The dry diallyl resin composition is solid in a temperature range of 40 ° C. or lower, and can be processed into a granular or ingot form. The dry diallyl resin composition according to item 1 of the patent application scope, wherein the diallyl resin is selected from the group consisting of diallyl phthalate and a structural compound represented by formula (1) Any one or a combination of polymerized poly (1,2-cyclohexanedioic acid diallyl esters). (1) The dry diallyl resin composition according to item 1 of the patent application scope, wherein the crosslinking agent is selected from diallyl phthalate monomer, diallyl phthalate prepolymer, Any of 1,2-cyclohexanediacid diallyl monomer, 1,2-cyclohexanediacid diallyl prepolymer, styrene monomer, or a combination thereof. The dry diallyl resin composition according to item 1 of the patent application scope, wherein the cross-linking agent is 100 parts by weight of the diallyl resin, and the blending amount of the cross-linking monomer is 10 weight or less Serving. The dry diallyl resin composition according to item 1 of the patent application scope, wherein the white pigment is any one selected from the group consisting of titanium oxide, barium titanate, strontium titanate, aluminum oxide, magnesium oxide, zinc oxide, and barium sulfate. One or a combination. The dry diallyl resin composition according to item 1 of the scope of the patent application, wherein the amount of the white pigment is 100 to 300 parts by weight relative to 100 parts by weight of the diallyl resin. The dry diallyl resin composition according to item 1 of the scope of patent application, wherein the average particle diameter of the white pigment is 2.0 μm or less. The dry diallyl resin composition according to item 1 of the patent application range, wherein the reinforcing material is glass fiber, and the amount of the reinforcing material is 10 to 200 weights relative to 100 parts by weight of the diallyl resin. Serving. An LED reflector cup is formed by using the dry diallyl resin composition according to any one of claims 1 to 7 of the scope of patent application. The LED reflecting cup according to item 9 of the application scope, which is formed by an injection molding method or a transfer injection molding method.