LED-UV adhesive

Abstract

The invention relates to the technical field of LEDs, in particular to an LED-UV adhesive. The LED-UV adhesive is prepared from epoxy modified acrylate, polyurethane acrylate, hyperbranched polyester acrylate, a UV acrylic monomer, a photoinitiator, filling light scattering powder, a polymerization inhibitor and fumed silica. According to the invention, the polyurethane acrylate resin has excellent adhesive force to a plastic substrate and excellent flexibility, and is matched with the epoxy modified acrylate resin and the hyperbranched polyester acrylate resin; the prepared LED-UV adhesive has the characteristics of high light transmittance, high curing speed, tough adhesive layer, vibration resistance, good stability, good weather resistance, good insulativity, high temperature resistance, water resistance, high hardness and the like, is particularly suitable for packaging of LED lamps, and can emit light in 360 degrees in all directions when the LED lamps are electrified, so that the light emitting area and the light efficiency are increased, and the LED lamps are more energy-saving and environment-friendly.

Description

Technical Field

[0001] The invention relates to the technical field of LEDs, and in particular to an LED-UV adhesive. Background Art

[0002] LED lamps are widely used as light sources in the field of lighting or decorations and have become an indispensable part of people's lives. Their specific structure includes a power plug, a bridge stack connected to the power plug with wires, and several LED lamps connected to the wires behind the bridge stack.

[0003] Among them, the light strip products are LEDs and resistors connected in series to form a long strip, and the outside is covered with PVC material to form a rope, so it is also called a rope light. Due to its soft characteristics, the light strip products can be bent and wound at will, and can produce various patterns, texts and other complex graphics. The length can be made very long, even reaching more than 100 meters. At the same time, it can be cut at will according to its minimum unit length. It is easy to install and has strong environmental adaptability. You can DIY various products, which has a huge market in the field of decorative lights.

[0004] At present, the transparent materials used for flexible light strip packaging on the market mainly include polyurethane, epoxy resin and silicone. Among them, epoxy resin is not suitable for outdoor use due to its poor low-temperature toughness and easy aging at high temperature; silicone is limited in its application due to its weak adhesion, low mechanical strength, strong moisture permeability and oxygen permeability; polyurethane is more widely used because of its relatively good waterproof, acid resistance, high and low temperature resistance and good mechanical properties. However, the -NCO group in the structure of polyurethane easily reacts with water to generate CO2 at room temperature, thereby generating bubbles. In addition, the above three types of glue also have the disadvantages of slow curing and low production efficiency. Summary of the invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide an LED-UV adhesive with higher curing performance and higher comprehensive performance.

[0006] To achieve the above object, the present invention provides a LED-UV adhesive, comprising:

[0007] Epoxy modified acrylate, polyurethane acrylate, hyperbranched polyester acrylate, UV acrylic monomer, photoinitiator, filler diffuser, inhibitor and fumed silica.

[0008] The LED-UV adhesive provided by the present invention includes epoxy-modified acrylate, which functions to improve the toughness and curing time of the LED-UV adhesive.

[0009] In the present invention, the epoxy-modified acrylate refers to a resin obtained by reacting epoxy resin and acrylic acid. The epoxy-modified acrylate is preferably epoxy-modified acrylate HE329. In some specific embodiments of the present invention, the epoxy-modified acrylate is epoxy-modified acrylate HE329 produced by Guangdong Haohui New Materials Company.

[0010] The content of the epoxy-modified acrylate is preferably 15 to 70 parts by weight, more preferably 15 to 20 parts by weight, further preferably 18 to 20 parts by weight, and most preferably 20 parts by weight.

[0011] The LED-UV adhesive provided by the present invention includes polyurethane acrylate, which functions to improve the adhesion and flexibility of the LED-UV adhesive.

[0012] The molecule of the polyurethane acrylate (PUA) contains an acrylic functional group and a carbamate bond. The polyurethane acrylate is preferably polyurethane acrylate CR92511. In some specific embodiments of the present invention, the polyurethane acrylate is polyurethane acrylate CR92511 produced by Guangdong Haohui New Materials Company.

[0013] The content of the polyurethane acrylate is preferably 20 to 70 parts by weight, more preferably 30 to 50 parts by weight, further preferably 40 to 45 parts by weight, and most preferably 42 parts by weight.

[0014] The LED-UV adhesive provided by the present invention comprises hyperbranched polyester acrylate, which functions to improve the hardness of the LED-UV adhesive.

[0015] The hyperbranched polyester acrylate is preferably hyperbranched polyester acrylate CR90205. In some specific embodiments of the present invention, the hyperbranched polyester acrylate is hyperbranched polyester acrylate CR90205 produced by Guangdong Haohui New Materials Company.

[0016] The content of the hyperbranched polyester acrylate is preferably 5-10 parts by weight, more preferably 5-8 parts by weight, and further preferably 5 parts by weight.

[0017] The LED-UV adhesive prepared by the present invention through the joint action of epoxy-modified acrylate, polyurethane acrylate and hyperbranched polyester acrylate has excellent comprehensive performance, and has the advantages of fast curing speed, excellent mechanical properties, strong high temperature and moisture resistance, and strong adhesion.

[0018] The LED-UV adhesive provided by the present invention comprises UV acrylic monomer which serves as an active diluent.

[0019] The content of the UV acrylic monomer is preferably 20 to 30 parts by weight, more preferably 23 to 27 parts by weight, and further preferably 25 parts by weight.

[0020] The UV acrylic monomer preferably includes one or more of N,N-dimethylacrylamide (DMAA) and isobornyl acrylate (IBOA), and more preferably includes isobornyl acrylate and N,N-dimethylacrylamide.

[0021] When the isobornyl acrylate and N,N-dimethylacrylamide are mixed as diluents, the LED-UV adhesive can obtain higher glossiness and improve oxygen inhibition.

[0022] The mass ratio of isobornyl acrylate to N,N-dimethylacrylamide is preferably (1-2):1, more preferably 1.5:1.

[0023] In some specific embodiments of the present invention, the content of isobornyl acrylate is 15 parts by weight, and the content of N,N-dimethylacrylamide is 10 parts by weight.

[0024] The LED-UV adhesive provided by the present invention includes a photoinitiator, which functions to initiate the polymerization reaction of the system.

[0025] The content of the photoinitiator is preferably 3 to 6 parts by weight, more preferably 3 to 4 parts by weight, and further preferably 3 parts by weight.

[0026] The photoinitiator is preferably one or more of 819, TPO, and 184, and more preferably 2,4,6-trimethylbenzoyldiphenylphosphine oxide (PITPO).

[0027] The LED-UV adhesive provided by the present invention includes light-scattering powder, which is used to increase the luminous brightness.

[0028] The content of the filling astigmatism powder is preferably 1 to 3 parts by weight, more preferably 2 to 3 parts by weight, and further preferably 3 parts by weight.

[0029] The filling diffuser powder is preferably silicone diffuser powder. In some specific embodiments of the present invention, the filling diffuser powder is Japanese Shin-Etsu KMP590.

[0030] The LED-UV adhesive provided by the present invention includes a polymerization inhibitor, which serves to improve storage stability.

[0031] The content of the polymerization inhibitor is preferably 0.01 to 0.1 parts by weight, more preferably 0.04 to 0.06 parts by weight, and further preferably 0.05 parts by weight.

[0032] The polymerization inhibitor is preferably methyl hydroquinone (MEHQ).

[0033] The LED-UV adhesive provided by the present invention includes fumed silica, which has the function of increasing consistency and thixotropy, and is beneficial to glue dispensing construction.

[0034] The content of the fumed silica is preferably 1 to 5 parts by weight, more preferably 1 to 3 parts by weight, and further preferably 2 parts by weight.

[0035] Preferably, the LED-UV adhesive of the present invention comprises, by weight:

[0036]

[0037] The LED-UV adhesive provided by the present invention is suitable for LED-UV adhesive used for coating LED lamp beads.

[0038] The present invention has no special limitation on the preparation method of the LED-UV adhesive. Each component is weighed according to weight percentage, and dispersed and mixed evenly with a stirrer. When the viscosity is within the normal range, the finished adhesive is obtained.

[0039] Compared with the prior art, the present invention provides an LED-UV adhesive, comprising: epoxy-modified acrylate, polyurethane acrylate, hyperbranched polyester acrylate, UV acrylic monomer, photoinitiator, filling light-scattering powder, inhibitor and fumed silica.

[0040] The present invention utilizes the excellent adhesion of polyurethane acrylate resin to plastic substrates and its excellent flexibility, and is matched with epoxy modified acrylate resin and hyperbranched polyester acrylate resin to prepare an LED-UV adhesive with the characteristics of high light transmittance, fast curing speed, tough adhesive layer, vibration resistance, good stability, good weather resistance, good insulation, high temperature resistance, waterproofness, high hardness, etc. The LED-UV adhesive is particularly suitable for the packaging of LED lamps, and can emit light in all directions of 360 degrees when the LED lamp is powered on, so as to increase the light-emitting area and light effect, thereby making the LED lamp more energy-saving and environmentally friendly. DETAILED DESCRIPTION

[0041] In order to further illustrate the present invention, the following is a detailed description in conjunction with the embodiments. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the invention.

[0042] All raw materials of the present invention are not particularly limited in their sources and can be purchased from the market or prepared according to conventional methods well known to those skilled in the art.

[0043] Examples 1-8

[0044] Prepare LED-UV adhesive according to the ratio in Table 1-2.

[0045] Preparation method:

[0046] Weigh each component by weight percentage, and use a stirrer to disperse and mix them evenly. If the viscosity is within the normal range, the finished adhesive is obtained.

[0047] Table 1 Ratios of raw materials in Examples 1 to 4

[0048]

[0049] Table 2 Ratios of raw materials in Examples 5 to 8

[0050]

[0051] The UV glue prepared in the above Examples 1 to 8 was tested under the dispensing process conditions determined by the present invention, and the test results are shown in Table 3-4:

[0052] Table 3 Test results of UV glue prepared in Examples 1 to 4

[0053]

[0054] Table 4 Test results of UV glue prepared in Examples 5 to 8

[0055]

[0056] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A LED-UV adhesive, characterized in that: include: Epoxy modified acrylate, polyurethane acrylate, hyperbranched polyester acrylate, UV acrylic monomer, photoinitiator, filler diffuser, inhibitor and fumed silica.

2. The LED-UV adhesive according to claim 1, characterized in that: In parts by weight, it includes:

3. The LED-UV adhesive according to claim 2, characterized in that: In parts by weight, it includes:

4. The LED-UV adhesive according to any one of claims 1 to 3, characterized in that: The epoxy-modified acrylate is epoxy-modified acrylate HE329; The polyurethane acrylate is polyurethane acrylate CR92511; The hyperbranched polyester acrylate is hyperbranched polyester acrylate CR90205; The UV acrylic monomer includes one or more of isobornyl acrylate and N,N-dimethylacrylamide; The photoinitiator is one or more of 819, TPO, and 184; The filling diffusive powder is silicone diffusing powder; The polymerization inhibitor is hydroquinone methyl ether.

5. The LED-UV adhesive according to claim 4, characterized in that: The UV acrylic monomers include isobornyl acrylate and N,N-dimethylacrylamide.

6. The LED-UV adhesive according to claim 5, characterized in that: The mass ratio of isobornyl acrylate to N,N-dimethylacrylamide is (1-2):

1.

7. The LED-UV adhesive according to claim 6, characterized in that: The mass ratio of isobornyl acrylate to N,N-dimethylacrylamide is 1.5:

1.

8. The LED-UV adhesive according to claim 4, characterized in that: The photoinitiator is 2,4,6-trimethylbenzoyldiphenylphosphine oxide.

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