CN110643119A

CN110643119A - PS frosted resin and preparation method thereof

Info

Publication number: CN110643119A
Application number: CN201910780371.9A
Authority: CN
Inventors: 熊明; 熊子昂
Original assignee: Shenzhen Bao Polymerization Plastics Co Ltd
Current assignee: Shenzhen Bao Polymerization Plastics Co Ltd
Priority date: 2019-08-22
Filing date: 2019-08-22
Publication date: 2020-01-03

Abstract

The invention discloses PS frosted resin and a preparation method thereof, and aims to solve the problems that in the prior art, the frosted effect of glass is improved, but the formula is complex, various additives are required to be added, and the cost is high. The key points of the technical scheme are as follows: comprises the following components in percentage by weight: 80-97 parts of PS resin and 3-20 parts of organic silicon microspheres. By adopting the proportion, the refractive index of the PS resin is improved to 1.63-1.75, the light transmittance is reduced by 5-12%, so that the light emitted by the LED lamp is softer, the formula is simple, the cost is low, and the requirements of consumers are met.

Description

PS frosted resin and preparation method thereof

Technical Field

The present invention relates to a matte resin, and more particularly, to a PS matte resin and a method for preparing the same.

Background

In general, sanding is a process of making an originally smooth surface uneven and irradiating light to form a diffuse reflection on the surface, and the resulting product becomes a sanded product.

Ground glass or resin is usually selected for the lamp to achieve the effect of soft light, but the ground glass or resin is produced by a machining method, such as a sand blasting process, so that the labor intensity is high, and the effect is not ideal enough.

In order to solve the problems, at present, chinese patent with publication number CN103342952A discloses a polyurethane resin frosted paint and a preparation method thereof, and the key points of the technical scheme are as follows: firstly, producing a multi-component polyurethane frosted coating, then spraying the polyurethane frosted coating on cleaned glass, and baking to obtain the sand-imitating effect.

Although the proposal improves the frosting effect of the glass, the invention has complex formula, needs to add a plurality of additives and has high cost.

Therefore, a new solution is needed to solve this problem.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide the PS frosted resin which is simple in components and low in cost.

The technical purpose of the invention is realized by the following technical scheme: the PS frosted resin comprises the following components in percentage by weight:

80 to 97 percent of PS resin

3-20% of organic silicon microspheres.

By adopting the above technical scheme, Polystyrene (abbreviated as PS) is a polymer synthesized by free radical addition polymerization of styrene monomer, and is inferior to methacrylic resin in light stability, but the radiation resistance is the strongest of all plastics. The most important feature of polystyrene is that it has excellent thermal stability and fluidity when melted, so that it is easy to mold and process, especially injection molding, and suitable for mass production. The polystyrene is easy to process and form, and has the advantages of transparency, low cost, rigidity, insulation, good printability and the like. It can be widely used in light industry market, daily decoration, lighting indication and package.

The organic silicon microspheres which are regular and have higher surface gloss are added into the PS resin, so that the whole PS resin has a frosting effect after being extruded, the light blocking effect is better, the vertical reflection and the reflectivity of surface light are reduced, and the light loss is better reduced.

By adopting the proportion, the refractive index of the PS resin is improved to 1.63-1.75, the light transmittance is reduced by 5-12%, so that the light emitted by the LED lamp is softer, the formula is simple, the cost is low, and the requirements of consumers are met.

The invention is further configured to: the PS scrub resin further includes a coupling agent.

By adopting the technical scheme, the coupling agent is used as a surface modifier, so that the viscosity of a synthetic resin melt can be reduced in the plastic processing process, the dispersity of the filler is improved to improve the processing performance, and a product can obtain good surface quality and mechanical, thermal and electrical properties, so that the prepared PS resin has good sanding effect and good mechanical strength, thermal stability and electrical resistance.

The invention is further configured to: the coupling agent comprises one or the combination of more than two of zirconium coupling agent, titanate coupling agent and silane coupling agent.

By adopting the technical scheme, the zirconium coupling agent is a low-molecular-weight inorganic polymer containing zirconium aluminate. The adhesive can promote the adhesion between PS resin and organic silicon microspheres, and can improve the performance, especially the rheological property, of a composite material system;

the titanate coupling agent can promote better adhesion between the PS resin and the organic silicon microspheres and has good coupling effect;

the general formula of the silane coupling agent is RSiX₃Wherein R represents amino, sulfydryl, vinyl, epoxy, cyano, methacryloxy and other groups, and the groups have stronger reaction capability with different matrix resins to promote PS resin and organic resinAdhesion between silicon microspheres.

The invention is further configured to: the PS scrub resin further includes a lubricant.

By adopting the technical scheme, the lubricant has good compatibility with the PS resin and the organic silicon microspheres, and plays a role in reducing the cohesion between the PS resin and the organic silicon microspheres, thereby improving the internal friction heat generation of the plastic melting material and the fluidity of the melting material. The bonding between the internal lubricant and the molecules of the PS resin and the organic silicon microspheres is not strong, and the effect similar to that of a rolling bearing can be generated, so that the internal lubricant can be arranged in the melt flow direction to slide with each other, and the internal friction force is reduced; the time and energy required by the mixing process of the PS resin and the organic silicon microspheres can be effectively reduced.

The invention is further configured to: the lubricant is one or the combination of more than two of polyethylene lubricant, polytetrafluoroethylene lubricant and polypropylene lubricant.

By adopting the technical scheme, the polyethylene lubricant, the polytetrafluoroethylene lubricant and the polypropylene lubricant are common internal lubricants, have good compatibility with the PS resin and the organic silicon microspheres, and enable the PS resin and the organic silicon microspheres to be uniformly mixed more conveniently.

The invention is further configured to: the PS scrub resin also includes an antioxidant.

By adopting the technical scheme, the antioxidant can prevent the adverse effect of oxygen, prevent or delay the oxidation of the PS resin and the organic silicon microspheres, improve the stability of the PS resin and the organic silicon microspheres and prolong the service life.

The invention is further configured to: the antioxidant is one or the combination of more than two of tetra [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, tri [2, 4-di-tert-butylphenyl ] phosphite and dilauryl thiodipropionate.

By adopting the technical scheme, the tetra [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester is white crystalline powder, has stable chemical properties and is one of excellent varieties of the current antioxidants; the volatility is small, the extraction resistance is good, the thermal stability is high, the persistent effect is long, and the paint is not colored, polluted and nontoxic; is a hindered phenol antioxidant with high molecular weight, has very low volatility, is not easy to migrate and is extraction-resistant; the PS resin can be effectively prevented from thermal oxidation degradation in the long-term aging process, is also an efficient processing stabilizer and can improve the color change resistance of a polymer material under the high-temperature processing condition;

the tris [2, 4-di-tert-butylphenyl ] phosphite ester has good compatibility with PS resin, relieves the thermal oxidative degradation of the PS resin in a long-term aging process, and has excellent performances of high efficiency, no discoloration, no pollution, no odor and the like;

dilauryl thiodipropionate, DLTP for short, relieves thermal oxidation degradation of PS resin in a long-term aging process, and is non-toxic, green and environment-friendly;

the pentaerythritol [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] ester, DLTP and tris [2, 4-di-tert-butylphenyl ] phosphite have a good synergistic effect, and the thermal stability of the PS resin during the thermal processing process can be improved.

The invention also aims to provide a preparation method of the PS frosted resin, which has the advantages of simple formula, simple preparation operation and low cost.

The technical purpose of the invention is realized by the following technical scheme: the preparation method of the PS frosted resin comprises the following steps:

s1: weighing the corresponding components according to the proportion;

s2: pouring the materials into a high-speed stirrer to be stirred for 10-20 minutes;

s3: and (3) putting the mixed materials into a screw extruder for extrusion molding.

Through adopting above-mentioned technical scheme, mix each component batching to make whole more even, put into screw extruder again and extrude, help the formation of PS resin dull polish effect, make the comparatively even dull polish effect of overall distribution in extrusion process simultaneously.

The invention is further configured to: in the extrusion molding process of the screw extruder, the screw temperature is 180-220 ℃.

Through adopting above-mentioned technical scheme, because the screw rod drives advancing of material, in order to make the material melt and take place the reaction, need the suitable temperature of screw rod control, thereby reduce the condition that the high temperature appears carbonization, blackening, and the temperature is crossed low and is made the material not get into the molten state, thereby makes the condition of extruding failure appear.

The invention is further configured to: the screw extruder comprises a feeding zone, a melting zone, a mixing zone, a die head zone and a die head outlet, wherein the temperature of the feeding zone is 180 ℃, the temperature of the melting zone is 190 ℃, the temperature of the mixing zone is 210 ℃, the temperature of the die head zone is 220 ℃, and the temperature of the die head outlet is 200 ℃.

By adopting the technical scheme, the temperature control of each section is different, generally the temperature close to the feeding area is lower than that of the rest part, the blockage caused by melting of materials at the feeding port is prevented, the temperature can not be too low, if the feeding temperature is too low, the solid conveying area is prolonged, the lengths of the plasticizing area and the melt conveying area are reduced, the bad plasticization is caused, the product quality is influenced, for the melting area and the mixing area, the vacuum degree of the section is controlled by controlling the temperature, an important process index is provided, if the vacuum degree is low, the exhaust effect is influenced, bubbles are caused in the pipe, and the mechanical property of the pipe is seriously reduced. The outlet of the die head is an important part for forming an extruded product, and the function of the outlet is to generate higher melt pressure and form the melt into a required shape, and the melt is formed into a certain shape by proper temperature reduction and is not in a molten state any more.

In conclusion, the invention has the following beneficial effects: by the formula and the preparation method, the prepared PS resin has a good frosting effect, is wholly dispersed, has a good manufacturing effect, has good shading performance and good light reflectivity, is softer in light of a lampshade of an LED lamp, is low in cost, and meets the requirements of consumers.

Detailed Description

The present invention will be described in detail with reference to examples.

The lubricant has no special class requirement, and can be selected from one of polyethylene lubricant, polytetrafluoroethylene lubricant and polypropylene lubricant or the combination of more than two of polyethylene lubricant, polytetrafluoroethylene lubricant and polypropylene lubricant.

The coupling agent has no special class requirement, and can be one of zirconium coupling agent, titanate coupling agent and silane coupling agent or the combination of more than two of zirconium coupling agent, titanate coupling agent and silane coupling agent.

The antioxidant is not particularly limited, and may be selected from pentaerythritol tetrakis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], tris [2, 4-di-tert-butylphenyl ] phosphite and dilauryl thiodipropionate (DLTP for short), or a combination of two or more thereof.

PS resin, Polystyrene (abbreviated PS), refers to a polymer synthesized by radical addition polymerization of styrene monomer.

The organic silicon microspheres are purchased from Shenzhen treasure plastic materials Limited, and other raw materials are purchased from the market.

Example 1

The PS frosted resin comprises the following components in percentage by weight:

80 parts of PS resin

20 parts of organic silicon microspheres

0.002 part of polyethylene lubricant

0.002 part of zirconium coupling agent

0.001 part of tetrakis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] pentaerythritol ester

0.001 part of tris [2, 4-di-tert-butylphenyl ] phosphite

In other embodiments, the lubricant may be selected from one of a polytetrafluoroethylene lubricant and a polypropylene lubricant or a combination of two or more of a polyethylene lubricant, a polytetrafluoroethylene lubricant and a polypropylene lubricant.

In other embodiments, the coupling agent may also be selected from one of a titanate coupling agent and a silane coupling agent or a combination of two or more of a zirconium coupling agent, a titanate coupling agent and a silane coupling agent.

In other embodiments, the antioxidant may be selected from pentaerythritol tetrakis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ], tris [2, 4-di-tert-butylphenyl ] phosphite and dilauryl thiodipropionate (DLTP).

Example two

The difference between the second example and the first example is that the weight of the PS frosted resin and the weight of the silicone microspheres are respectively adjusted to 85 parts and 15 parts.

EXAMPLE III

The difference between the third example and the first example is that the weight of the PS frosted resin and the weight of the silicone microspheres are respectively adjusted to 90 parts and 10 parts.

Example four

The difference between the PS frosted resin and the first embodiment is that the weight of the PS frosted resin and the weight of the silicone microspheres are respectively adjusted to 95 parts and 5 parts.

EXAMPLE five

The difference between the PS frosted resin and the first embodiment is that the weight of the PS frosted resin and the weight of the silicone microspheres are respectively adjusted to 97 parts and 3 parts.

EXAMPLE six

The PS frosted resin, the sixth example is different from the fifth example in that no polyethylene lubricant, zirconium-based coupling agent, pentaerythritol tetrakis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and tris [2, 4-di-tert-butylphenyl ] phosphite are added.

EXAMPLE seven

The difference between the PS frosted resin and the first embodiment is that the particle size of the organic silicon microsphere is 40 microns.

Example eight

The difference between the eighth embodiment and the first embodiment is that the particle size of the silicone microspheres is 60 micrometers.

Example nine

The difference between the PS frosted resin and the first embodiment is that the particle size of the organic silicon microsphere is 80 microns.

Comparative example 1

The PS resin is prepared by adding 100 parts of PS resin.

Table 1 is a summary of the components and the proportions of the data of the above examples and comparative examples, and Table 2 is a summary of the examples containing the organosilicon microspheres with different particle sizes, so that the differences of the added components and the proportions of the examples and comparative examples and the differences of the particle sizes of the organosilicon microspheres are more visually shown.

TABLE 1 summary of the components and proportions of the examples and comparative examples data

Table 2 summary of examples containing silicone microspheres of different particle sizes

	Organosilicon microsphere particle size (micrometer)
		Example 1	30
Example 7	40
		Example 8	60
Example 9	80

The performance analysis of each example in table 1 and table 2 is performed to obtain table 3, and the analysis of each item of data in table 3 can find that, under the condition that other conditions are not changed, the refractive index of the PS resin is gradually increased and the light transmittance is gradually reduced along with the increase of the proportion occupied by the silicone microspheres; the haze gradually increases and the surface roughness also gradually increases. In addition, experiments show that the concave-convex density of the surface of the PS resin is increased along with the increase of the proportion of the organic silicon microspheres; the larger the particle size of the organic silicon microspheres is, the larger the surface roughness of the obtained PS resin is. It is obvious from the experimental results that due to the addition of the organic silicon microspheres, the frosting effect of the PS resin surface is well improved, and the light can be softer when the light scattering plate or the light scattering film is used as an LED.

Although the influence of the addition of the polyethylene lubricant, the zirconium-based coupling agent, the pentaerythritol tetrakis [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] and the tris [2, 4-di-tert-butylphenyl ] phosphite on the PS abrasive resin cannot be directly reflected from the data in table 3, the influence of the four compounds on the PS abrasive resin affects the time of the preparation process and the quality of the prepared PS abrasive resin, and plays a very important role.

TABLE 3 analysis of the Properties of the examples and comparative examples

	Refractive index	Light transmittance (%)	Haze (%)	Surface roughness (micron)
					Example 1	1.75	80	97	7.8
Example 2	1.72	82	95	6.7
					Example 3	1.69	85	93	5.8
Example 4	1.66	87	91	5.2
					Example 5	1.63	90	89	4.3
Example 6	1.63	90	89	4.3
					Example 7	1.73	82	95	8.1
Example 8	1.71	83	93	8.5
					Example 9	1.70	85	91	9.1
Comparative example 1	1.59	92	2.9	0.05

Example 10

The preparation method of the PS frosted resin in preparation example 1 comprises the following steps:

s1, weighing the corresponding components according to the proportion;

s2, pouring the materials into a high-speed stirrer to be stirred for 10-20 minutes;

s3, putting the mixed materials into a screw extruder for extrusion molding;

the screw extruder comprises a feeding zone, a melting zone, a mixing zone, a die head zone and a die head outlet, wherein the temperature of the feeding zone is 180 ℃, the temperature of the melting zone is 190 ℃, the temperature of the mixing zone is 210 ℃, the temperature of the die head zone is 220 ℃, and the temperature of the die head outlet is 200 ℃.

Examples 11 to 19

The preparation methods of the PS frosted resin, examples 11 to 19 are the preparation steps of the preparation examples 2 to 9 and the comparative example 1, respectively, and are different from the preparation method of the example 10 only in the difference of the weighed components or the weight.

In addition, the invention also makes a routine performance test on the finished products prepared in the examples 1 and 7, and the following table specifically shows:

performance items	Test method	Commercially available AS	Example 1	Example 7
					Elongation at break	D-638	2％	2％	2％
Notched impact strength (kg. cm/cm)	D-256	1.6	3.2	3.2
					Flexural Strength (kg/cm)²)	D-790	700	700	700
Vicat softening temperature (. degree. C.)	D-1525	95	104	104

As can be seen from the table above, the finished products prepared in examples 1 and 7 have improved elongation at break, notched impact strength and bending strength to a certain extent, and have better mechanical strength; the Vicat softening temperature is obviously improved, so the heat resistance is better.

The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.

Claims

The PS frosted resin is characterized in that: comprises the following components in percentage by weight:

80 to 97 percent of PS resin

3-20% of organic silicon microspheres.
2. The PS frosted resin according to claim 1, wherein: the PS scrub resin further includes a coupling agent.
3. The method of claim 2, wherein: the coupling agent comprises one or the combination of more than two of zirconium coupling agent, titanate coupling agent and silane coupling agent.
4. The PS frosted resin according to claim 1, wherein: the PS scrub resin further includes a lubricant.
5. The PS frosted resin of claim 4, wherein: the lubricant is one or the combination of more than two of polyethylene lubricant, polytetrafluoroethylene lubricant and polypropylene lubricant.
6. The PS frosted resin according to claim 1, wherein: the PS scrub resin also includes an antioxidant.
7. The PS frosted resin according to claim 6, wherein: the antioxidant is one or the combination of more than two of tetra [3- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester, tri [2, 4-di-tert-butylphenyl ] phosphite and dilauryl thiodipropionate.
The preparation method of the PS frosted resin is characterized by comprising the following steps: the method comprises the following steps:

s1: weighing the corresponding components according to the proportion;

s2: pouring the materials into a high-speed stirrer to be stirred for 10-20 minutes;

s3: and (3) putting the mixed materials into a screw extruder for extrusion molding.
9. The method for producing a PS frosted resin according to claim 8, wherein: in the extrusion molding process of the screw extruder, the screw temperature is 180-220 ℃.
10. The method for producing a PS frosted resin according to claim 1, wherein: the screw extruder comprises a feeding zone, a melting zone, a mixing zone, a die head zone and a die head outlet, wherein the temperature of the feeding zone is 180 ℃, the temperature of the melting zone is 190 ℃, the temperature of the mixing zone is 210 ℃, the temperature of the die head zone is 220 ℃, and the temperature of the die head outlet is 200 ℃.