CN112126152B - Polypropylene composite material with low-light diffusion effect and preparation method thereof - Google Patents
Polypropylene composite material with low-light diffusion effect and preparation method thereof Download PDFInfo
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Abstract
The application relates to a polypropylene composite material with a low-light diffusion effect and a preparation method thereof, wherein 100 parts of homo-polypropylene, 0.1-2 parts of light diffusion agent 1, 0.1-2 parts of light diffusion agent 2, 1-2 parts of antioxidant and 1-2 parts of modifier are put into a high-speed mixer for mixing according to parts by weight; extruding and granulating the mixed raw materials to prepare the antibacterial polypropylene composite material with the micro-light diffusion effect; the light dispersing agent 1 in the antibacterial polypropylene composite material with the micro-light dispersing effect is spherical glass beads with the refractive index of 1.50, and the light dispersing agent 2 is silver ion substituted zirconium phosphate with a cubic structure with the refractive index of 1.83; the light transmittance of the antibacterial polypropylene composite material with the micro-light diffusion effect is 89-91%, the haze is 17-25%, the antibacterial activity value of escherichia coli is 4.0-6.0, and the antibacterial activity value of staphylococcus aureus is 4.0-6.0.
Description
Technical Field
The application belongs to the technical field of polypropylene composite materials, and relates to a polypropylene composite material with a micro-light diffusion effect and a preparation method thereof.
Background
Along with the development of LED light sources, transparent decorative plates for LEDs are also developed rapidly, the traditional transparent plates are generally formed by directly injection molding transparent plastics such as PC (personal computer) and PS (polystyrene), and a layer of high-haze light diffusion plate part is needed to be manufactured inside the transparent plastic part directly to prevent the dazzling effect caused by too concentrated point light sources. With the simplification and low cost of the design of the LED lamp, the integrated design of the diffusion plate and the decorative plate is more and more favored.
Because of the organic matter characteristics of the plastic parts, bacteria are easy to grow, more troubles are brought to practical use, and whether the materials have excellent antibacterial property is also a reference point selected by consumers.
Polypropylene is widely used in household appliances, food packaging and other industries due to the characteristics of low density, good transparency, easy processing, low cost, recoverability, excellent mechanical properties and the like. However, no report has been made on the use of polypropylene materials for light diffusion and light diffusion materials having antibacterial effects at the same time.
The prior art discloses a light diffusion modified polypropylene material and a preparation method thereof, wherein the light diffusion modified polypropylene material comprises the following components in percentage by weight: 98.5 to 99 percent of polypropylene, 0.3 to 0.8 percent of light dispersing agent, 0.05 to 0.5 percent of transparent modifier, 0.1 to 0.5 percent of antioxidant and 0.1 to 0.3 percent of light stabilizer, thus preparing the polypropylene material with light dispersing effect. However, the light diffusion material with high haze prepared by the method has no transparency and antibacterial effect.
Therefore, research on an antibacterial polypropylene composite material with a low-light diffusion effect and high light transmittance is of great significance.
Disclosure of Invention
In order to solve the problems in the prior art, the application provides a polypropylene composite material with a micro-light diffusion effect and a preparation method thereof;
one of the purposes is to provide a polypropylene composite material with a micro-light diffusion effect, which comprises the following components in parts by weight: 100 parts of homo-polypropylene, 0.1-2 parts of light dispersing agent 1, 0.1-2 parts of light dispersing agent 2, 1-2 parts of antioxidant and 1-2 parts of modifier, wherein the light dispersing agent 1 is spherical glass microsphere with the refractive index of 1.50, the light dispersing agent 2 is silver ion substituted zirconium phosphate with the cubic structure with the refractive index of 1.83, the modifier is sorbitol transparent, the light transmittance of the polypropylene composite material is 89-91%, the haze is 17-25%, the escherichia coli antibacterial activity value is 4.0-6.0, and the staphylococcus aureus antibacterial activity value is 4.0-6.0.
The second purpose is to provide a preparation method of polypropylene composite material with micro-light diffusion effect, which specifically comprises the following steps: according to parts by weight, firstly, 100 parts of homo-polypropylene, 0.1-2 parts of light dispersing agent 1, 0.1-2 parts of light dispersing agent 2, 1-2 parts of antioxidant and 1-2 parts of modifier are put into a high-speed mixer to be mixed, and then extrusion granulation is carried out on the mixed raw materials to prepare the antibacterial polypropylene composite material with the micro-light diffusion effect.
In order to achieve the above purpose, the application adopts the following technical scheme:
an antibacterial polypropylene composite material with a low-light diffusion effect comprises the following components in parts by weight:
the refraction index of the homo-polypropylene is 1.54, the light dispersing agent 1 is spherical glass beads with the refraction index of 1.50, and the light dispersing agent 2 is silver ion substituted zirconium phosphate with a cubic structure with the refraction index of 1.83;
the light transmittance of the antibacterial polypropylene composite material with the micro-light diffusion effect is 89-91%, the haze is 17-25%, the antibacterial activity value of escherichia coli is 4.0-6.0, and the antibacterial activity value of staphylococcus aureus is 4.0-6.0. Light transmittance and haze were tested according to GB/T2410-2008; the antibacterial activity values of staphylococcus aureus and escherichia coli were tested according to ISO 22196-2011.
As a preferable technical scheme:
the antibacterial polypropylene composite material with the micro-light diffusion effect has the advantages that the melt index of the homo-polypropylene is 8-12 g/10min under the test condition of 2.16kg at 230 ℃, for example, the melt index is lower than 8g/10min, the viscosity of the material is too high, for example, the viscosity of the material is higher than 12g/10min, the number average molecular weight of the material is lower, the dispersing effect of the light diffusion agent can be influenced easily due to the fact that the dispersing effect is influenced by the agglomeration of the light diffusion agent and the modifier, and the light diffusion effect is influenced.
The antibacterial polypropylene composite material with the micro-light diffusion effect has the advantages that the particle size of the spherical glass microspheres is 2-6 mu m, and the particle size of the cubic silver ion substituted zirconium phosphate is 2-6 mu m. The glass microspheres and silver ion substituted zirconium phosphate have small particle size, so that agglomeration is easy to generate, a uniform diffusion network cannot be formed, network passages formed in the material are fewer due to the large particle size, and more and effective diffusion routes cannot be formed.
The antibacterial polypropylene composite material with the micro-light diffusion effect is characterized in that the antioxidant is a compound of phosphite antioxidants and hindered phenol antioxidants with the mass ratio of 1:0.3-3. Phosphite esters and hindered phenol antioxidants can capture and prevent the generation of heated free radicals in the material and prevent the material from yellowing and degrading.
The antibacterial polypropylene composite material with the low-light diffusion effect is characterized in that the transparent modifier is sorbitol transparent agent, and the sorbitol transparent agent can enable the polypropylene composite material to be well crystallized so as to achieve an excellent transparent effect; .
The antibacterial polypropylene composite material with the low-light diffusion effect is characterized in that the sorbitol type transparent agent is dibenzylidene sorbitol, di (p-methyl benzylidene) sorbitol or (3, 4-dimethyl dibenzylidene) sorbitol.
The application also provides a method for preparing the antibacterial polypropylene composite material with the micro-light diffusion effect, which comprises the following steps:
(1) 100 parts of homopolymerized polypropylene, 0.1-2 parts of light dispersing agent 1, 0.1-2 parts of light dispersing agent 2, 1-2 parts of antioxidant and 1-2 parts of transparent modifier are put into a high-speed mixer for mixing according to parts by weight;
(2) Extruding and granulating the mixed raw materials in the step (1) to obtain the antibacterial polypropylene composite material with the micro-light diffusion effect.
In the method, the rotating speed of the high-speed mixer in the step (1) is 200-400 rpm, and the mixing time is 2-5 min.
In the method, extrusion granulation in the step (2) is performed in a double-screw extruder, the rotating speed of the double-screw extruder is 200-400 rpm, and the temperature is 180-220 ℃.
The mechanism of the application is as follows:
the spherical glass beads are silicate components and are commonly used as fillers in plastics to improve the mechanical properties of the materials, so that the fluidity of the filled materials can be increased, the processability of the plastics is improved, the surface leveling of engineering plastics is improved, and the surface problem of glass fiber reinforcement is solved. The silver ion substituted zirconium phosphate is an antibacterial agent for common materials such as plastics, paint and the like, and the material has a good antibacterial effect by adding the silver ion substituted zirconium phosphate.
According to the application, through the compound use of the spherical glass beads and silver ion substituted zirconium phosphate, the light diffusion effect of the polypropylene composite material can be well improved, and the better light transmittance can be maintained; this is because: the refractive index of polypropylene is 1.54, and by compounding spherical glass beads (light dispersing agent 1) of 1.50 and silver ion substituted zirconium phosphate (light dispersing agent 2) of 1.83, as the refractive indexes of polypropylene, the light dispersing agent 1 and the surface of the light dispersing agent 2 are different from each other, and the refractive index of the light dispersing agent 1 is lower than that of polypropylene, and the refractive index of the light dispersing agent 2 is higher than that of polypropylene, on one hand, light rays are reflected on the surfaces of the spherical glass beads to play a role in diffusing light rays, on the other hand, the added silver ion substituted zirconium phosphate with a cube structure can well reflect light rays on the surface of a cube, and when the spherical glass beads with the spherical structure and the silver ion substituted zirconium phosphate with the cube structure are compounded, a filling system which is uniformly dispersed with each other can form a complementary structure, wherein the complementary structure is shown in that: when the light is reflected on the surface of the cube structure, the reflected light can be further reflected through the spherical structure, and vice versa; a large number of substances with different structures and different refractive indexes exist in the composite material, when light passes through an interface of one of the substances, reflection and refraction can occur, and when the reflected light passes through another interface, reflection and refraction can occur, and after the reflection and refraction processes are performed for numerous times, the light finally passes out of the composite material; the greater the difference in refractive index, the greater the reflection angle; the spherical and cubic structures are complementary, and the diffusion effect (i.e. haze improvement) of light rays can be greatly improved after multiple reflections. Meanwhile, the glass beads and silver ion substituted zirconium phosphate adopted in the application have small influence on the light transmittance, and the material can still be made to have a transparent effect, namely, the transparency is high under the condition of low addition.
Because the silver ion-substituted zirconium phosphate contains silver ions, and the silver ions have very excellent antibacterial effect, the product provided by the application has very excellent antibacterial effect at the same time.
The beneficial effects are that:
(1) The polypropylene composite material with the micro-light diffusion effect uses the homo-polypropylene with the melt index of 8-12 g/10min (230 ℃ for 2.16 kg), has excellent light transmittance due to high crystallinity and fine and large crystal nucleus, and simultaneously has better processability and excellent impact property, and has better coating property on light diffusion agent powder;
(2) According to the polypropylene composite material with the low-light diffusion effect, the light diffusion effect is improved and the good light transmittance is kept through the compounding of the glass beads and the silver ion substituted zirconium phosphate, the polypropylene refractive index is 1.54, and the spherical glass beads with the refractive index of 1.50 and the silver ion substituted zirconium phosphate with the refractive index of 1.83 are compounded, so that different refractive indexes are formed among the materials, better light diffusion and resin penetration can be well achieved, and good light transmittance and low-light diffusion effect are achieved;
(3) According to the polypropylene composite material with the low-light diffusion effect, excellent antibacterial property of a finished piece is realized through the excellent antibacterial effect of silver ions in silver ion replacement zirconium phosphate;
(4) The product prepared from the polypropylene composite material with the low-light diffusion effect has smooth surface, transparent finished piece and certain haze, light diffusion effect and antibacterial effect, attractive appearance and low cost.
Detailed Description
The application is further described below in conjunction with the detailed description. It is to be understood that these examples are illustrative of the present application and are not intended to limit the scope of the present application. Furthermore, it should be understood that various changes and modifications can be made by one skilled in the art after reading the teachings of the present application, and such equivalents are intended to fall within the scope of the application as defined in the appended claims.
The performance test method of the polypropylene composite material prepared by the application comprises the following steps:
the composite material is molded into a polishing plate with the thickness of 2mm, the light transmittance and the haze are tested according to GB/T2410-2008, and meanwhile, the diffusion effect of the light source is visually measured at the position 1cm away from the LED point light source by the 2mm plate; the antibacterial activity values of staphylococcus aureus and escherichia coli were tested according to ISO 22196-2011.
The particle sizes referred to in the application are all average particle sizes;
the silver ion replacement zirconium phosphate with a cubic structure adopted in the application is a cubic zirconium phosphate carrier JDGQP-003, and the manufacturer: jinda nanotechnology (Xiamen) limited.
Example 1
The preparation method of the antibacterial polypropylene composite material with the micro-light diffusion effect comprises the following steps:
raw material preparation: a homo-polypropylene with a melt index of 8g/10min under the test condition of 2.16kg at 230 ℃, spherical glass beads with an average particle diameter of 3 mu m and a refractive index of 1.50 (light diffusant 1), silver ion substituted zirconium phosphate with a cubic structure with a particle diameter of 2 mu m and a refractive index of 1.83 (light diffusant 2), a compound of phosphite antioxidants and hindered phenol antioxidants (antioxidants) with a mass ratio of 1:1, dibenzylidene sorbitol (transparent modifier);
(1) 100 parts of homopolymerized polypropylene, 0.1 part of light dispersing agent 1, 0.1 part of light dispersing agent 2, 1 part of antioxidant and 1 part of transparent modifier are put into a high-speed mixer for mixing according to parts by weight; wherein the rotating speed of the high-speed mixer is 400 revolutions per minute, and the mixing time is 3 minutes;
(2) Extruding and granulating the mixed raw materials in the step (1) in a double-screw extruder to obtain an antibacterial polypropylene composite material with a micro-light diffusion effect; wherein the rotating speed of the double-screw extruder is 400 revolutions per minute, and the temperature is 200 ℃;
the antibacterial polypropylene composite material with the micro-light diffusion effect has the light transmittance of 91%, the haze of 20%, the escherichia coli antibacterial activity value of 4 and the staphylococcus aureus antibacterial activity value of 4; visual inspection of the light source: is soft.
Comparative example 1
A preparation method of a polypropylene composite material, the steps of which are basically the same as those of example 1, except that no light diffusing agent 2 is added in step (1), and the mass of the light diffusing agent 1 is the same as the sum of the masses of the light diffusing agents 1 and 2 of example 1, and the prepared composite material is subjected to performance test, and the test results are shown in Table 1.
Comparative example 2
A preparation method of a polypropylene composite material, the steps of which are basically the same as those of example 1, except that no light diffusing agent 1 is added in step (1), and the mass of a light diffusing agent 2 is the same as the sum of the masses of the light diffusing agents 1 and 2 of example 1, and the prepared composite material is subjected to performance test, and the test results are shown in Table 1.
Comparative example 3
A preparation method of a polypropylene composite material, which is basically the same as in example 1, except that glass beads are replaced by silica (spherical structure) with a refractive index of 1.6 in step (1) and the like, and the prepared composite material is subjected to performance test, and the test results are shown in Table 1.
Comparative example 4
A preparation method of a polypropylene composite material is basically the same as that of the example 1, except that the homo-polypropylene of the example 1 is replaced by the homo-polypropylene with the melt index of 7g/10min in the step (1), and the prepared composite material is subjected to performance test, and the test results are shown in Table 1.
Comparative example 5
A preparation method of a polypropylene composite material is basically the same as that of the example 1, except that the homo-polypropylene of the example 1 is replaced by the homo-polypropylene with the melt index of 13g/10min in the step (1), and the prepared composite material is subjected to performance test, and the test results are shown in Table 1.
Table 1 Properties of comparative examples 1 to 5
As can be seen from comparing comparative example 1 with example 1, the haze of the composite material prepared in comparative example 1 is lower because the haze is lower when the incident light is reflected on the surfaces of the glass beads having a spherical structure, and the light cannot form an effective complementary reflection effect in the composite material; and the composite material of comparative example 1 does not have antibacterial property because silver ions are used for the antibacterial effect of example 1, and no silver ions are contained in comparative example 1; the visual inspection result of the light source is glaring, which more intuitively indicates that the composite material has poor light diffusion effect.
As can be seen by comparing comparative example 2 with example 1, the haze of the composite material prepared in comparative example 2 is lower because the incident light rays form less diffusion paths within the composite material than a single spherical structure after being reflected at the surface of the cubic structured silver ion substituted zirconium phosphate; the visual inspection of the light source was glaring, which indicated that the composite material had poor light diffusion.
As can be seen from comparing comparative example 3 with example 1, the transmittance of the composite material prepared in comparative example 3 is also much lower because silica has a strong light hiding effect and light cannot be reflected from the composite material; the haze of the composite material in comparative example 3 was lower because a good diffusion synergy was achieved when a part of the light diffusing agent had a refractive index lower than that of polypropylene and another part had a refractive index higher than that of polypropylene, and both the refractive index of silica and the refractive index of silver ion-substituted zirconium phosphate salt in comparative example 3 were higher than that of polypropylene, so that such synergy effect could not be achieved, and the visual observation result of the light source was more glaring, which indicated that the diffusion effect of the composite material to light was poor.
As can be seen from comparing comparative examples 4 and 5 with example 1, the light transmittance and haze of the composite materials prepared in comparative examples 4 and 5 are lower than those of example 1, because the melt index in comparative example 4 is low, the viscosity of the material is high, the melt index in comparative example 5 is high, the number average molecular weight of the material is low, and when the viscosity of polypropylene is too high or too low, the uniform dispersion of light diffusers 1 and 2 in the polypropylene melt during processing is not favored, so that the light diffusers 1 and 2 are agglomerated, and the light diffusion effect and light transmittance of the material are affected; and the antibacterial performance of the composite materials in comparative examples 4 and 5 is significantly reduced because the viscosity of the material is too high, the silver ion substituted zirconium phosphate is unevenly distributed in the composite material, and the uniform dispersion of silver ions of the material is affected, resulting in reduced antibacterial performance; the visual inspection of the light source was more glaring, indicating that the composite material had poor light diffusion.
Example 2
The preparation method of the antibacterial polypropylene composite material with the micro-light diffusion effect comprises the following steps:
raw material preparation: a homo-polypropylene with a melt index of 9g/10min under the test condition of 2.16kg at 230 ℃, spherical glass beads (light dispersing agent 1) with a particle diameter of 4 mu m and a refractive index of 1.50, silver ions with a cubic structure with a particle diameter of 3 mu m and a refractive index of 1.83 replace zirconium phosphate (light dispersing agent 2), and a compound of phosphite antioxidant and hindered phenol antioxidant (antioxidant) bis (p-methyl benzylidene) sorbitol (transparent modifier) with a mass ratio of 1:2;
(1) 100 parts of homopolymerized polypropylene, 2 parts of light dispersing agent 1, 2 parts of light dispersing agent 2, 2 parts of antioxidant and 2 parts of transparent modifier are put into a high-speed mixer for mixing according to parts by weight; wherein the rotating speed of the high-speed mixer is 300 revolutions per minute, and the mixing time is 2 minutes;
(2) Extruding and granulating the mixed raw materials in the step (1) in a double-screw extruder to obtain an antibacterial polypropylene composite material with a micro-light diffusion effect; wherein the rotating speed of the double-screw extruder is 300 revolutions per minute, and the temperature is 190 ℃;
the antibacterial polypropylene composite material with the micro-light diffusion effect has the light transmittance of 89%, the haze of 25%, the escherichia coli antibacterial activity value of 6 and the staphylococcus aureus antibacterial activity value of 6; visual inspection of the light source: is soft.
Example 3
The preparation method of the antibacterial polypropylene composite material with the micro-light diffusion effect comprises the following steps:
raw material preparation: a homo-polypropylene with a melt index of 11g/10min under the test condition of 2.16kg at 230 ℃, spherical glass beads with a particle diameter of 5 mu m and a refractive index of 1.50 (light diffusant 1), silver ion substituted zirconium phosphate with a cubic structure with a particle diameter of 5 mu m and a refractive index of 1.83 (light diffusant 2), a compound of phosphite antioxidants and hindered phenol antioxidants (antioxidants) (3, 4-dimethyl dibenzylidene) sorbitol with a mass ratio of 1:3 (transparent modifier);
(1) 100 parts of homopolymerized polypropylene, 1 part of light dispersing agent 1, 1 part of light dispersing agent 2, 1 part of antioxidant and 2 parts of transparent modifier are put into a high-speed mixer for mixing according to parts by weight; wherein the rotating speed of the high-speed mixer is 350 revolutions per minute, and the mixing time is 5 minutes;
(2) Extruding and granulating the mixed raw materials in the step (1) in a double-screw extruder to obtain an antibacterial polypropylene composite material with a micro-light diffusion effect; wherein the rotating speed of the double-screw extruder is 350 revolutions per minute, and the temperature is 180 ℃;
the antibacterial polypropylene composite material with the micro-light diffusion effect has the light transmittance of 90%, the haze of 17%, the escherichia coli antibacterial activity value of 5 and the staphylococcus aureus antibacterial activity value of 5; visual inspection of the light source: is soft.
Example 4
The preparation method of the antibacterial polypropylene composite material with the micro-light diffusion effect comprises the following steps:
raw material preparation: a homopolymer polypropylene with a melt index of 12g/10min under the test condition of 2.16kg at 230 ℃, spherical glass beads with a particle diameter of 2 mu m and a refractive index of 1.50 (light diffusant 1), silver ion substituted zirconium phosphate with a cubic structure with a particle diameter of 2 mu m and a refractive index of 1.83 (light diffusant 2), and a compound of phosphite antioxidant and hindered phenol antioxidant (antioxidant) dibenzylidene sorbitol with a mass ratio of 1:0.5 (transparent modifier);
(1) 100 parts of homopolymerized polypropylene, 0.1 part of light dispersing agent 1, 0.1 part of light dispersing agent 2, 1 part of antioxidant and 1 part of transparent modifier are put into a high-speed mixer for mixing according to parts by weight; wherein the rotating speed of the high-speed mixer is 250 revolutions per minute, and the mixing time is 4 minutes;
(2) Extruding and granulating the mixed raw materials in the step (1) in a double-screw extruder to obtain an antibacterial polypropylene composite material with a micro-light diffusion effect; wherein the rotating speed of the double-screw extruder is 250 revolutions per minute, and the temperature is 190 ℃;
the light transmittance of the antibacterial polypropylene composite material with the micro-light diffusion effect is 89%, the haze is 25%, the antibacterial activity value of escherichia coli is 5.9, and the antibacterial activity value of staphylococcus aureus is 6; visual inspection of the light source: is soft.
Example 5
The preparation method of the antibacterial polypropylene composite material with the micro-light diffusion effect comprises the following steps:
raw material preparation: a homo-polypropylene with a melt index of 8g/10min under the test condition of 2.16kg at 230 ℃, spherical glass beads (light dispersing agent 1) with a particle diameter of 5 mu m and a refractive index of 1.50, silver ions with a cubic structure with a particle diameter of 4 mu m and a refractive index of 1.83 replace zirconium phosphate (light dispersing agent 2), and a compound of phosphite antioxidant and hindered phenol antioxidant (antioxidant) dibenzylidene sorbitol (transparent modifier) with a mass ratio of 1:0.3;
(1) 100 parts of homopolymerized polypropylene, 2 parts of light dispersing agent 1, 2 parts of light dispersing agent 2, 2 parts of antioxidant and 2 parts of transparent modifier are put into a high-speed mixer for mixing according to parts by weight; wherein the rotating speed of the high-speed mixer is 200 revolutions per minute, and the mixing time is 2 minutes;
(2) Extruding and granulating the mixed raw materials in the step (1) in a double-screw extruder to obtain an antibacterial polypropylene composite material with a micro-light diffusion effect; wherein the rotating speed of the double-screw extruder is 200 revolutions per minute, and the temperature is 195 ℃;
the antibacterial polypropylene composite material with the micro-light diffusion effect has the light transmittance of 89%, the haze of 25%, the escherichia coli antibacterial activity value of 6 and the staphylococcus aureus antibacterial activity value of 6; visual inspection of the light source: is soft.
Example 6
The preparation method of the antibacterial polypropylene composite material with the micro-light diffusion effect comprises the following steps:
raw material preparation: a homo-polypropylene with a melt index of 9g/10min under the test condition of 2.16kg at 230 ℃, spherical glass beads (light dispersing agent 1) with a particle diameter of 6 mu m and a refractive index of 1.50, silver ions with a cubic structure with a particle diameter of 6 mu m and a refractive index of 1.83 replace zirconium phosphate (light dispersing agent 2), and a compound of phosphite antioxidant and hindered phenol antioxidant (antioxidant) bis (p-methyl benzylidene) sorbitol (transparent modifier) with a mass ratio of 1:1.5;
(1) 100 parts of homopolymerized polypropylene, 1 part of light dispersing agent 1, 1 part of light dispersing agent 2, 1 part of antioxidant and 2 parts of transparent modifier are put into a high-speed mixer for mixing according to parts by weight; wherein the rotating speed of the high-speed mixer is 400 revolutions per minute, and the mixing time is 3 minutes;
(2) Extruding and granulating the mixed raw materials in the step (1) in a double-screw extruder to obtain an antibacterial polypropylene composite material with a micro-light diffusion effect; wherein the rotating speed of the double-screw extruder is 400 revolutions per minute, and the temperature is 205 ℃;
the antibacterial polypropylene composite material with the micro-light diffusion effect has the light transmittance of 90%, the haze of 24%, the escherichia coli antibacterial activity value of 5.9 and the staphylococcus aureus antibacterial activity value of 5.9; visual inspection of the light source: is soft.
Example 7
The preparation method of the antibacterial polypropylene composite material with the micro-light diffusion effect comprises the following steps:
raw material preparation: a homo-polypropylene with a melt index of 10g/10min under the test condition of 2.16kg at 230 ℃, spherical glass beads with a particle diameter of 4 mu m and a refractive index of 1.50 (light diffusant 1), silver ion substituted zirconium phosphate with a cubic structure with a particle diameter of 3 mu m and a refractive index of 1.83 (light diffusant 2), a compound of phosphite antioxidant and hindered phenol antioxidant (antioxidant) (3, 4-dimethyl dibenzylidene) sorbitol with a mass ratio of 1:2.2 (transparent modifier);
(1) 100 parts of homopolymerized polypropylene, 0.1 part of light dispersing agent 1, 0.1 part of light dispersing agent 2, 1 part of antioxidant and 1 part of transparent modifier are put into a high-speed mixer for mixing according to parts by weight; wherein the rotating speed of the high-speed mixer is 330 revolutions per minute, and the mixing time is 4 minutes;
(2) Extruding and granulating the mixed raw materials in the step (1) in a double-screw extruder to obtain an antibacterial polypropylene composite material with a micro-light diffusion effect; wherein the rotating speed of the double-screw extruder is 330 revolutions per minute, and the temperature is 220 ℃;
the antibacterial polypropylene composite material with the micro-light diffusion effect has the light transmittance of 91%, the haze of 17%, the escherichia coli antibacterial activity value of 4.1 and the staphylococcus aureus antibacterial activity value of 4; visual inspection of the light source: is soft.
Example 8
The preparation method of the antibacterial polypropylene composite material with the micro-light diffusion effect comprises the following steps:
raw material preparation: a homo-polypropylene with a melt index of 10g/10min under the test condition of 2.16kg at 230 ℃, spherical glass beads with a particle diameter of 2 mu m and a refractive index of 1.50 (light diffusant 1), silver ions with a cubic structure with a particle diameter of 2 mu m and a refractive index of 1.83 replace zirconium phosphate (light diffusant 2), and a compound of phosphite antioxidants and hindered phenol antioxidants (antioxidants) dibenzylidene sorbitol (transparent modifier) with a mass ratio of 1:2.7;
(1) 100 parts of homopolymerized polypropylene, 2 parts of light dispersing agent 1, 2 parts of light dispersing agent 2, 2 parts of antioxidant and 2 parts of transparent modifier are put into a high-speed mixer for mixing according to parts by weight; wherein the rotating speed of the high-speed mixer is 220 revolutions per minute, and the mixing time is 4 minutes;
(2) Extruding and granulating the mixed raw materials in the step (1) in a double-screw extruder to obtain an antibacterial polypropylene composite material with a micro-light diffusion effect; wherein the rotating speed of the double-screw extruder is 220 revolutions per minute, and the temperature is 200 ℃;
the light transmittance of the antibacterial polypropylene composite material with the micro-light diffusion effect is 89%, the haze is 24%, the antibacterial activity value of escherichia coli is 5.2, and the antibacterial activity value of staphylococcus aureus is 5.3; visual inspection of the light source: is soft.
Claims (6)
1. An antibacterial polypropylene composite material with a low-light diffusion effect is characterized in that: comprises the following components in parts by weight:
100 parts of homo-polypropylene;
1.1-2 parts of light dispersing agent;
2.1-2 parts of light dispersing agent;
1-2 parts of an antioxidant;
1-2 parts of a transparent modifier;
the melt index of the homo-polypropylene under the test condition of 2.16kg at 230 ℃ is 8-12 g/10min;
the light dispersing agent 1 is spherical glass beads with the refractive index of 1.50, and the light dispersing agent 2 is silver ion substituted zirconium phosphate with a cubic structure with the refractive index of 1.83;
the transparent modifier is sorbitol transparent agent;
the particle size of the spherical glass beads is 2-6 mu m, and the particle size of the cubic silver ion substituted zirconium phosphate is 2-6 mu m;
the light transmittance of the antibacterial polypropylene composite material with the micro-light diffusion effect is 89-91%, the haze is 17-25%, the antibacterial activity value of escherichia coli is 4.0-6.0, and the antibacterial activity value of staphylococcus aureus is 4.0-6.0.
2. The antibacterial polypropylene composite material with the micro-light diffusion effect according to claim 1, wherein the antioxidant is a compound of phosphite antioxidants and hindered phenol antioxidants in a mass ratio of 1:0.3-3.
3. The antimicrobial polypropylene composite with micro-optic diffusion effect according to claim 1, wherein the sorbitol type transparent agent is dibenzylidene sorbitol, di (p-methylbenzylidene) sorbitol or (3, 4-dimethyl dibenzylidene) sorbitol.
4. A method for preparing the antibacterial polypropylene composite material with the micro-light diffusion effect according to any one of claims 1-3, which is characterized by comprising the following steps:
(1) According to parts by weight, 100 parts of homo-polypropylene, 0.1-2 parts of light dispersing agent 1, 0.1-2 parts of light dispersing agent 2, 1-2 parts of antioxidant and 1-2 parts of transparent modifier are placed into a high-speed mixer for mixing;
(2) Extruding and granulating the mixed raw materials in the step (1) to obtain the antibacterial polypropylene composite material with the micro-light diffusion effect.
5. The method of claim 4, wherein the high speed mixer in step (1) has a rotational speed of 200 to 400 rpm and a mixing time of 2 to 5 minutes.
6. The method according to claim 5, wherein the extrusion granulation in the step (2) is performed in a twin-screw extruder, the rotation speed of the twin-screw extruder is 200-400 rpm, and the temperature is 180-220 ℃.
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