High-temperature-resistant polystyrene diffusion plate and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant polystyrene diffusion plate and a preparation method thereof, and relates to the technical field of diffusion plate materials. The preparation method comprises the following steps: adding polystyrene, a cross-linking agent divinyl benzene and an initiator BPO into a double-screw extruder in percentage by mass to prepare the high-temperature-resistant polystyrene diffusion plate; under the action of the initiator, the raw material components are subjected to a post-crosslinking chemical reaction in a twin-screw extruder, while a polystyrene molecular chain is opened, the polystyrene molecular chain and a crosslinking agent divinyl benzene are subjected to a crosslinking reaction in a screw, the molecular weight is improved, and due to stable existence of a crosslinking bond, the thermal stability of the polystyrene molecular chain is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of diffusion plate materials, in particular to a high temperature resistant polystyrene diffusion plate and a preparation method thereof. Background Art

[0002] The biggest feature of the diffuser is that it causes great interference to light. No matter how many degrees the original design of the light distribution curve is, as long as the light passes through the diffuser, it will change the beam angle to 160-176°. So from the side, the panel of the lamp has a layer of fog. From this point, it can be proved that the beam angle is as large as 160-176°. The better proof, the larger the beam angle, the lower the illumination. Some will also produce filtering, so that some wavelengths cannot penetrate, causing color deviation. If the surface is treated with light interference again (for example: frosting, embossing), the transmittance is even lower due to the natural phenomenon of geometric optics. Therefore, the base material used to make the diffuser should be selected with a refractive index as low as possible, and the interference to light will be lower. According to the material classification, the diffuser can be made into diffusers for different purposes by transparent polymer materials or synthetic materials such as glass, polystyrene, polycarbonate, polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, acrylic, and acrylic acid.

[0003] The invention patent with announcement number CN108084308A discloses a polystyrene resin material for a light diffuser plate and a preparation method thereof. The polystyrene material for a light diffuser plate is composed of styrene monomer, mineral oil, lubricant, release agent, antioxidant and antioxidant auxiliary agent. The polystyrene material for a light diffuser plate has the characteristics of high light transmittance, anti-oxidation and yellowing resistance. Summary of the invention

[0004] The object of the present invention is to provide a high temperature resistant polystyrene diffuser plate with excellent thermal stability and a preparation method thereof.

[0005] In order to solve the above technical problems, the present invention provides the following technical solutions: a high temperature resistant polystyrene diffusion plate, comprising the following components in mass percentage: 95-97% polystyrene, 2-4% homemade cross-linking agent and 1% initiator.

[0006] Preferably, the homemade crosslinking agent comprises modified polydivinylbenzene and hyperbranched acrylate-amine; and the initiator is initiator BPO.

[0007] Preferably, the modified polydivinylbenzene is prepared by reacting divinylbenzene with acrylamide; and the hyperbranched acrylate-amine is prepared by reacting aminoethylpiperazine with ethylene glycol dimethacrylate.

[0008] Preferably, the preparation method of the high temperature resistant polystyrene diffuser comprises the following steps: adding polystyrene, a homemade cross-linking agent, and an initiator benzoyl peroxide into a twin-screw extruder according to mass percentage, undergoing a cross-linking chemical reaction in the twin-screw extruder, extruding and granulating to obtain a high temperature resistant polystyrene diffuser masterbatch; putting the high temperature resistant polystyrene diffuser masterbatch into the extruder, extruding and injecting it into a mold to obtain a high temperature resistant polystyrene diffuser.

[0009] Preferably, the preparation method of the homemade cross-linking agent is: modifying polydivinylbenzene, hyperbranched acrylate-amine and acetone in a mass ratio of 1 to 3:1:30, stirring evenly and heating to 80 to 90°C, reacting for 4 to 6 hours, and rotary evaporating to obtain the homemade cross-linking agent.

[0010] Preferably, the preparation method of the modified polydivinylbenzene is: divinylbenzene, acrylamide and acetone are mixed in a mass ratio of 1:1:5-6, stirred and dissolved, and then 0.01-0.02 times the mass of divinylbenzene is added in azobisisobutylene, stirred and reacted at 40-80rpm, transferred to a reactor and heated to 98-102°C, reacted for 24h, vacuum dried at 50-60°C, and ground to obtain modified polydivinylbenzene.

[0011] Preferably, the preparation method of the hyperbranched acrylate-amine is: under a nitrogen atmosphere, aminoethylpiperazine and chloroform are mixed in a mass ratio of 1.8 to 2:5, stirred evenly, and then ethylene glycol dimethacrylate in an amount of 1.2 to 1.3 times the mass of aminoethylpiperazine is added dropwise at a rate of 1 to 3 ml / min, the temperature is raised to 40 to 42° C., and the reaction is carried out for 6 to 8 hours to obtain the hyperbranched acrylate-amine.

[0012] Preferably, the extrusion speed of the twin-screw extruder is 3 to 3.2 m / min; the extrusion rate of the extruder is 2.4 to 2.8 m / min.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0014] The invention adds polystyrene and a self-made cross-linking agent in a twin-screw extruder according to mass percentage to prepare a high-temperature resistant polystyrene diffusion plate; ordinary inorganic additives fill the polystyrene molecular chain to reduce the thermal motion amplitude of the polymer, thereby improving the thermal stability; while the invention, under the action of an initiator, the raw material components undergo a post-cross-linking chemical reaction in the twin-screw extruder, and while the polystyrene molecular chain is opened, a cross-linking reaction is carried out with the self-made cross-linking agent in the screw, thereby increasing the molecular weight, and due to the stable existence of the cross-linking bond, the thermal stability of the polystyrene molecular chain is significantly improved;

[0015] The homemade cross-linking agent includes modified polydivinylbenzene and hyperbranched acrylate-amine. The modified polydivinylbenzene is prepared by the reaction of divinylbenzene and acrylamide, and the hyperbranched acrylate-amine is prepared by the reaction of aminoethylpiperazine and ethylene glycol dimethacrylate. The modified polydivinylbenzene and hyperbranched acrylate-amine are blended as a composite cross-linking agent and undergo a post-cross-linking chemical reaction with polystyrene in a twin-screw extruder to further improve the thermal stability. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0017] In the embodiment of the present invention, the polystyrene is Formosa Chemical 550.

[0018] Example 1

[0019] The mass percentages of the components in this embodiment are:

[0020] 95% polystyrene, 4% homemade cross-linking agent divinylbenzene and 1% initiator BPO.

[0021] The preparation method of the high temperature resistant polystyrene diffusion plate in this embodiment is as follows:

[0022] S1. Under a nitrogen atmosphere, aminoethylpiperazine and chloroform were mixed in a mass ratio of 1.8:5, stirred evenly, and then ethylene glycol dimethacrylate (1.2 times the mass of aminoethylpiperazine) was added dropwise at a rate of 1 ml / min, the temperature was raised to 40°C, and the reaction was carried out for 6 hours to obtain a hyperbranched acrylate-amine; divinylbenzene, acrylamide and acetone were mixed in a mass ratio of 1:1:5, stirred to dissolve, and then 0.01 times the mass of divinylbenzene was added, and the mixture was stirred and reacted at 40 rpm. The mixture was transferred to a reactor and heated to 98°C. After reacting for 24 hours, the mixture was vacuum dried at 50°C and ground to obtain modified polydivinylbenzene; modified polydivinylbenzene, hyperbranched acrylate-amine and acetone were mixed in a mass ratio of 1:1:30, stirred evenly, and then heated to 80°C, reacted for 6 hours, and rotary evaporated to obtain a homemade cross-linking agent.

[0023] S2. Add polystyrene, cross-linking agent divinylbenzene and initiator benzoyl peroxide into a twin-screw extruder according to mass percentage. The extrusion speed of the twin-screw extruder is 3m / min. Extrusion granulation is carried out to obtain a high-temperature resistant polystyrene diffuser masterbatch; the high-temperature resistant polystyrene diffuser masterbatch is put into the extruder for extrusion and injected into the mold. The extrusion rate of the extruder is 2.4m / min to obtain a high-temperature resistant polystyrene diffuser.

[0024] Example 2

[0025] The mass percentages of the components in this embodiment are:

[0026] 96% polystyrene, 3% homemade cross-linker divinylbenzene and 1% initiator BPO.

[0027] The preparation method of the high temperature resistant polystyrene diffuser plate in this embodiment is as follows:

[0028] S1. Under a nitrogen atmosphere, aminoethylpiperazine and chloroform were mixed in a mass ratio of 1.9:5, stirred evenly, and then 1.25 times the mass of aminoethylpiperazine ethylene glycol dimethacrylate was added dropwise at a rate of 2 ml / min, the temperature was raised to 41°C, and the reaction was carried out for 7 hours to obtain a hyperbranched acrylate-amine; divinylbenzene, acrylamide and acetone were mixed in a mass ratio of 1:1:5.5, stirred to dissolve, and then 0.015 times the mass of divinylbenzene was added. The mixture was stirred and reacted at 60 rpm, and the mixture was transferred to a reactor and heated to 100°C. After reacting for 24 hours, the mixture was vacuum dried at 55°C and ground to obtain modified polydivinylbenzene; modified polydivinylbenzene, hyperbranched acrylate-amine and acetone were mixed in a mass ratio of 2:1:30, stirred evenly, and the temperature was raised to 85°C. The mixture was reacted for 5 hours, and rotary evaporated to obtain a homemade cross-linking agent.

[0029] S2. Add polystyrene, homemade cross-linking agent divinylbenzene, and initiator benzoyl peroxide into a twin-screw extruder according to mass percentage. The extrusion speed of the twin-screw extruder is 3.1m / min. Extrusion granulation is performed to obtain a high-temperature resistant polystyrene diffuser masterbatch. The high-temperature resistant polystyrene diffuser masterbatch is put into the extruder for extrusion and injected into the mold. The extrusion rate of the extruder is 2.6m / min to obtain a high-temperature resistant polystyrene diffuser.

[0030] Example 3

[0031] The mass percentages of the components in this embodiment are:

[0032] 97% polystyrene, 2% homemade cross-linking agent divinylbenzene and 1% initiator BPO.

[0033] The preparation method of the high temperature resistant polystyrene diffuser plate in this embodiment is as follows:

[0034] S1. Under a nitrogen atmosphere, aminoethylpiperazine and chloroform were mixed in a mass ratio of 2:5, stirred evenly, and then ethylene glycol dimethacrylate (1.3 times the mass of aminoethylpiperazine) was added dropwise at a rate of 3 ml / min, the temperature was raised to 42°C, and the reaction was carried out for 8 hours to obtain a hyperbranched acrylate-amine; divinylbenzene, acrylamide and acetone were mixed in a mass ratio of 1:1:6, stirred to dissolve, and then 0.02 times the mass of divinylbenzene was added, and the mixture was stirred and reacted at 80 rpm. The mixture was transferred to a reactor and heated to 102°C. After reacting for 24 hours, the mixture was vacuum dried at 60°C and ground to obtain modified polydivinylbenzene; modified polydivinylbenzene, hyperbranched acrylate-amine and acetone were mixed in a mass ratio of 3:1:30, stirred evenly, the temperature was raised to 90°C, the reaction was carried out for 6 hours, and the mixture was rotary evaporated to obtain a homemade cross-linking agent.

[0035] S2. Add polystyrene, cross-linking agent divinylbenzene and initiator benzoyl peroxide into a twin-screw extruder according to mass percentage. The extrusion speed of the twin-screw extruder is 3.2m / min. Extrusion granulation is carried out to obtain a high-temperature resistant polystyrene diffuser masterbatch; the high-temperature resistant polystyrene diffuser masterbatch is put into the extruder, extruded and injected into the mold. The extrusion rate of the extruder is 2.8m / min to obtain a high-temperature resistant polystyrene diffuser.

[0036] Comparative Example 1

[0037] The mass percentages of the components in this embodiment are:

[0038] 96% general purpose polystyrene, 4% calcium carbonate.

[0039] The preparation method of the high temperature resistant polystyrene diffuser plate in this embodiment is as follows:

[0040] General-grade polystyrene and calcium carbonate are added into a twin-screw extruder according to mass percentage. The extrusion speed of the twin-screw extruder is 3.1 m / min. Extrusion granulation is performed to obtain a high-temperature resistant polystyrene diffusion plate masterbatch. The high-temperature resistant polystyrene diffusion plate masterbatch is put into the extruder, extruded and injected into the mold. The extrusion rate of the extruder is 2.6 m / min to obtain a high-temperature resistant polystyrene diffusion plate.

[0041] Comparative Example 2

[0042] The preparation method of Comparative Example 2 is the same as that of Example 2. The difference between the high temperature resistant polystyrene diffusion plate and Example 2 is that the homemade cross-linking agent is only modified polydivinylbenzene.

[0043] Comparative Example 3

[0044] The preparation method of Comparative Example 3 is the same as that of Example 2. The difference between the high temperature resistant polystyrene diffusion plate and Example 2 is that the homemade cross-linking agent is only hyperbranched acrylate-amine.

[0045] Effect example

[0046] The high temperature resistant polystyrene diffuser plates prepared in the embodiment and the comparative example were placed in the same environment for heating at a heating rate of 120°C / H and subjected to a load of 70g with a deformation of 1MM to test the heat deformation temperature;

[0047] Table 1 below shows the performance analysis results of the high temperature resistant polystyrene diffuser plate.

[0048] Heat Deflection Temperature Heat Deflection Temperature Example 1 95℃ Comparative Example 1 72℃ Example 2 96℃ Comparative Example 2 76℃ Example 3 95℃ Comparative Example 3 79℃

[0049] By comparing the experimental data of the embodiment and the comparative example in Table 1, it can be clearly found that the high temperature resistant polystyrene diffuser plate prepared in the embodiment of the present invention has a higher heat deformation temperature.

[0050] By comparing the experimental data of Examples 1-3 with those of Comparative Examples 1-3, it can be found that when preparing a high-temperature resistant polystyrene diffusion plate, polystyrene, a homemade cross-linking agent and an initiator BPO are added in a twin-screw extruder according to mass percentage. Under the action of the initiator, the raw material components undergo a post-cross-linking chemical reaction in the twin-screw extruder. While the polystyrene molecular chain is opened, a cross-linking reaction is carried out with the cross-linking agent divinylbenzene in the screw, thereby increasing the molecular weight. In addition, due to the stable presence of cross-linking bonds, the thermal stability of the polystyrene molecular chain is significantly improved.

[0051] Obviously, the above embodiments are merely examples for clearly illustrating the embodiments of the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. However, these obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A high temperature resistant polystyrene diffuser plate, characterized in that: The invention comprises the following components in percentage by weight: 95-97% of polystyrene, 2-4% of a homemade cross-linking agent and 1% of an initiator.

2. The high temperature resistant polystyrene diffuser plate according to claim 1, characterized in that: The self-made crosslinking agent comprises modified polydivinylbenzene and hyperbranched acrylate-amine; and the initiator is initiator BPO.

3. The high temperature resistant polystyrene diffuser plate according to claim 2, characterized in that: The modified polydivinylbenzene is prepared by the reaction of divinylbenzene and acrylamide; and the hyperbranched acrylate-amine is prepared by the reaction of aminoethylpiperazine and ethylene glycol dimethacrylate.

4. A method for preparing a high temperature resistant polystyrene diffuser plate as claimed in claim 1, characterized in that: The preparation method of the high-temperature resistant polystyrene diffusion plate comprises the following steps: adding polystyrene, a self-made cross-linking agent and an initiator benzoyl peroxide into a twin-screw extruder according to mass percentage, extruding and granulating in the twin-screw extruder through a cross-linking chemical reaction to obtain a master batch of the high-temperature resistant polystyrene diffusion plate; and putting the master batch of the high-temperature resistant polystyrene diffusion plate into the extruder for extrusion and injection into a mold to obtain the high-temperature resistant polystyrene diffusion plate.

5. The method for preparing a high temperature resistant polystyrene diffuser plate according to claim 4, characterized in that: The preparation method of the homemade cross-linking agent is as follows: modified polydivinylbenzene, hyperbranched acrylate-amine and acetone are mixed in a mass ratio of 1-3:1:30, stirred evenly, heated to 80-90° C., reacted for 4-6 hours, and rotary evaporated to obtain the homemade cross-linking agent.

6. The method for preparing a high temperature resistant polystyrene diffuser plate according to claim 5, characterized in that: The preparation method of the modified polydivinylbenzene is as follows: divinylbenzene, acrylamide and acetone are mixed in a mass ratio of 1:1:5-6, and after stirring and dissolving, 0.01-0.02 times the mass of divinylbenzene is added in diisobutylene, and the mixture is stirred and reacted at 40-80 rpm, and the mixture is transferred to a reaction kettle and heated to 98-102° C., reacted for 24 hours, and then vacuum dried at 50-60° C. and ground to obtain the modified polydivinylbenzene.

7. The method for preparing a high temperature resistant polystyrene diffuser plate according to claim 5, characterized in that: The preparation method of the hyperbranched acrylate-amine is as follows: in a nitrogen atmosphere, aminoethylpiperazine and chloroform are mixed at a mass ratio of 1.8-2:5, and after being stirred evenly, ethylene glycol dimethacrylate in an amount of 1.2-1.3 times the mass of aminoethylpiperazine is added dropwise at a rate of 1-3 ml / min, the temperature is raised to 40-42° C., and the reaction is performed for 6-8 hours to obtain the hyperbranched acrylate-amine.

8. The method for preparing a high temperature resistant polystyrene diffuser plate according to claim 4, characterized in that: The extrusion speed of the twin-screw extruder is 3-3.2 m / min; the extrusion rate of the extruder is 2.4-2.8 m / min.