CN111117065B - High-gloss, low-VOC and scratch-resistant PP material and preparation method and device thereof - Google Patents
High-gloss, low-VOC and scratch-resistant PP material and preparation method and device thereof Download PDFInfo
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- CN111117065B CN111117065B CN201911360304.8A CN201911360304A CN111117065B CN 111117065 B CN111117065 B CN 111117065B CN 201911360304 A CN201911360304 A CN 201911360304A CN 111117065 B CN111117065 B CN 111117065B
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
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- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
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Abstract
The invention belongs to the technical field of material processing, and relates to a high-gloss, low-VOC and scratch-resistant PP material and a preparation method and a device thereof, wherein the raw materials are as follows by weight: PP resin: 91.0 to 98.0 parts; pearlescent resin: 0.1 to 2.0 parts; silicone oil: 0.05 to 0.1 part; the extractant comprises: 0.5 to 2.0 parts; an adsorbent: 0.5 to 1.0 part; heat stabilizer: 0.2 to 0.6; scratch resistant agent: 0.5 to 3.0 parts of pearl resin is added from a pearl resin feeding device near the head end of an extruder in the preparation process, so that the size integrity of the pearl resin in the preparation process is greatly reserved, a considerable part of pearl resin is selectively dispersed on the surface layer of plastic, the content of the pearl resin on the surface layer is improved, the glossiness of the PP material is greatly improved, the scratch resistance is also improved, the total consumption of the pearl resin is reduced, the cost of the composite material is reduced, and the impact toughness and the processing performance are also greatly improved compared with those of the same high-gloss material prepared by the traditional method.
Description
Technical Field
The invention belongs to the technical field of material processing, and relates to a PP material with high gloss, low VOC and scratch resistance, and a preparation method and a device thereof.
Background
With the development of society, people have higher requirements on beauty, and high-gloss PP materials are more and more widely applied. The traditional high-gloss PP material is realized by spraying primer, then spraying high-gloss finish paint or electroplating, and the like, and the primer is a thermosetting material and is difficult to melt again, so that the recycling performance of the plastic product after paint spraying is poor, and the reuse is influenced; the spraying process is complicated, and the rejection rate is high; the primer contains a large amount of toxic and harmful organic solvents, is easy to generate toxic and harmful gases and dust, seriously harms the health of human bodies, and simultaneously causes the problems of environmental pollution, energy waste and the like. In addition, PP materials can release harmful Volatile Organic Compounds (VOCs) to varying degrees during high temperature processing and use due to the effects of polymerization processes, catalysts, oxide residues, short chain oligomers, and the like. Meanwhile, the strength, stability, processability, functionality and the like of the plastic cannot meet the use requirements in most cases due to the limitation of the self-performance, and the plastic cannot be directly used for producing plastic products. At present, a mode of adding functional auxiliary agents is generally adopted to improve the performance, and materials such as heat stabilizer, scratch resistant agent and the like which are commonly used bring harmful VOC, have abnormal smell, are extremely unfavorable for people using the materials in relatively closed environments, and seriously harm the environment and health.
In the past few decades, quite a few researchers have made much work on environmental protection and high light, and the method adopted at present is to compound resin with one or more of high-light resin, brightening agent and pearlescent resin, so that the aim of environmental protection and high light is achieved, but the effect is limited at present. However, the Gao Ze degree of the pearlescent resin which is a common material for improving the glossiness of the PP resin is quite high, but the size of the pearlescent resin is greatly damaged due to the influences of temperature, shearing and the like in the mixing process and the processing process of the material, and meanwhile, the pearlescent resin is damaged to some extent due to the fact that the feeding mode of a traditional extruder is extrusion conveying through a screw rod. Thereby severely affecting the gloss of the composite. Because the traditional extrusion processing method has long action time of the pearl resin and the PP resin, the pearl resin can be uniformly dispersed in the PP resin, and selective dispersion is difficult to realize, so that the content of the pearl resin dispersed on the surface layer is relatively less. Before processing, the pearlescent resin has low content and low density in the process of mixing with other materials, and even dispersion in other resins is difficult to realize.
Disclosure of Invention
In view of the above, the invention provides a high-gloss, low-VOC and scratch-resistant PP material, a preparation method and a device thereof, which are used for solving the problems that the size integrity of the pearlescent resin is seriously damaged and the glossiness of the composite material is influenced when the high-gloss material is prepared by a traditional extruder through a screw extrusion conveying and shearing extrusion processing mode, and the pearlescent resin is difficult to stably discharge due to the fact that uniform dispersion cannot be realized in the feeding process.
In order to achieve the aim, the invention provides a high-gloss, low-VOC and scratch-resistant PP material which comprises the following raw materials in parts by weight: PP resin: 91-98 parts; pearlescent resin: 0.1 to 2.0 parts; silicone oil: 0.05 to 0.1 part; the extractant comprises: 0.5 to 2.0 parts; an adsorbent: 0.5 to 1.0 part; heat stabilizer: 0.2 to 0.6 part; scratch resistant agent: 0.5 to 3.0 parts.
Further, the pearl resin is one of glass pearl powder or synthetic pearl powder; the silicone oil is polyether modified silicone oil; the extractant is one or more than two of alkaline extractant and acidic extractant; the adsorbent is one or more than two of synthetic adsorbent and natural inorganic adsorbent, the heat stabilizer is one or two of antioxidant 1010 and antioxidant 168, and the scratch-resistant agent is silicone.
A preparation method of a PP material with high gloss, low VOC and scratch resistance comprises the following steps:
A. weighing PP resin, pearlescent resin, silicone oil, extractant, adsorbent, heat stabilizer and scratch-resistant agent for standby;
B. mixing PP resin, silicone oil, an extractant, a heat stabilizer and a scratch-resistant agent which are weighed according to the proportion, adding the mixture through a main feeding port of an extruder, enabling the mixture to pass through a conveying section of a machine barrel firstly through a screw, then entering an extraction melting section of the machine barrel for heating and melting, and carrying out vacuum extraction through a vacuum port I on the melting section after full extraction;
C. the melted mixture enters a plasticizing section of a machine barrel for plasticizing treatment, meanwhile, an adsorbent is added through a side feeding port, vacuum extraction is carried out again through a vacuum port II on the plasticizing section, and the pearlescent resin is added through a pearlescent resin feeding device close to a machine head;
D. finally, the mixture after cooling and solidification is processed by vacuum material drying to prepare the PP material with high gloss, low VOC and scratch resistance.
Further, the temperature of the conveying section of the machine barrel in the step B is 50-70 ℃; the temperature of the extraction melting section of the machine barrel increases gradually along the screw precession direction within 170-200 ℃; the plasticizing section temperature of the machine barrel increases gradually in the screw precession direction within 200-230 ℃.
Further, the vacuum degree at the vacuum port I and the vacuum port II is below-0.08 MPa.
Further, the screw rotation speed is 350 to 420rpm.
The device for the high-gloss, low-VOC and scratch-resistant PP material sequentially comprises a machine barrel and a machine head which are connected with each other, wherein a screw rod which is matched with the machine barrel to work is arranged in the machine barrel, and the machine barrel consists of a conveying section, an extraction melting section and a plasticizing section; the front end of the conveying section is provided with a main feeding port; the tail end of the extraction melting section is provided with a vacuum port I; the front end of the plasticizing section is provided with a side feeding port, the middle part of the plasticizing section is provided with a vacuum port II, and the plasticizing section is provided with a pearlescent resin feeding device close to the head end of the machine.
Further, the pearly-lustre resin feed arrangement includes that weightless title and bottom install the storage silo of gate valve, gate valve and weightless title signal connection, and the bottom of storage silo is connected with the title feed bin, title feed bin both sides install with weightless title signal connection's sensor, the bottom of title feed bin is connected with vibration feed mechanism, installs electromagnetic vibration exciter and drive cell body between weightless title and the vibration feed mechanism, and electromagnetic vibration exciter is connected with drive cell body.
Further, the vibration feeding mechanism comprises a vibration bin communicated with the weighing bin, a vibration slideway arranged at the bottom of the vibration bin and a vibrator which is arranged on the vibration bin and is in signal connection with the electromagnetic vibration exciter.
The invention has the beneficial effects that:
compared with the traditional extruder adopting a method of screw extrusion conveying and shearing extrusion processing, the preparation method of the PP material with high gloss, low VOC and scratch resistance has the following advantages:
(1) The pearlescent resin is added from a pearlescent resin feeding device near the head end of an extruder in the preparation process of the high-gloss, low-VOC and scratch-resistant PP, the action principle and the purpose of the pearlescent resin are completely different from or even contradicted to those of the traditional method, and the traditional shearing extrusion processing principle is to utilize the heating melting and shearing mixing of a screw rod so as to ensure that all components of the material are dispersed uniformly as much as possible. The principle of the method for adding the pearlescent resin into the molten plastic melt from the pearlescent resin feeding device near the head end of the extruder is that the section of screw is not sheared and only plays a role in conveying, the interaction time is shorter, the integrity of the dimension is greatly reserved, and the dimension retention rate is improved to more than 60 percent from about 30 percent of the traditional dimension retention rate. Because of the short interaction time, the pearlescent resin cannot migrate to the inner layer of the plastic melt, anddensity (0.15-0.45 g/cm) 3 ) Compared with plastic solution (0.9-0.95 g/cm) 3 ) And a considerable part of the pearl resin is dispersed (floated) on the surface layer of the plastic solution, and finally, most of the pearl resin is solidified on the surface layer of the plastic product, so that the selective dispersion is realized, the content of the pearl resin on the surface layer is improved, and the glossiness of the prepared PP material can be greatly improved according to the principle that the larger the pearl resin is, the larger the size is and the higher the glossiness is.
(2) The device for preparing the PP material with high gloss, low VOC and scratch resistance solves the problem that the traditional low-content (0.1% -2.0%) material or auxiliary agent can only be fed after being mixed with the high-content material, realizes online high-precision independent feeding, and greatly improves the content precision and the feeding stability of the material; meanwhile, the damage to the integrity of the pearlescent resin in the process of mixing materials is reduced.
(3) The vibration feeding mechanism is arranged in the device for preparing the PP with high gloss, low VOC and scratch resistance, which not only solves the problem of non-uniformity of the extrusion feeding of the screw rod of the traditional extruder, but also greatly reduces the damage to the integrity of the pearlescent resin in the process of rotating and feeding the traditional screw rod. Therefore, the pearlescent resin can be stably distributed in the PP, and meanwhile, the size integrity is further improved, so that the glossiness can be greatly improved.
(4) In the preparation process of the PP material with high gloss, low VOC and scratch resistance, an extractant and an adsorbent are adopted simultaneously, the PP resin in the composite material, harmful volatile matters contained in an auxiliary agent and generated in the processing process are removed in stages on an extruder, and multistage vacuum extraction is adopted, so that the residues of the harmful volatile organic matters in the composite material are greatly reduced, secondary pollution caused by the use of the organic extractant is avoided, and the influence on the performance of a matrix material is also reduced; finally, the PP material with good luster, good scratch resistance, less harmful volatile matters (VOC) and small taste is prepared.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a schematic diagram of a preparation device of a high-gloss, low-VOC and scratch-resistant PP material;
FIG. 2 is a schematic structural view of a pearlescent resin feeding device of the present invention;
FIG. 3 is a schematic diagram of a pearlescent resin feed apparatus of the present invention.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical drawings, and are not to be construed as limiting the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and are not representative of actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
The extractant BYK-P4200 used in the embodiment of the invention is purchased from Desolid, the adsorbent XC01 is purchased from Magnomonic mountain Keli chemical industry, and the particle sizes of the adopted glass pearls and artificial pearls are 100-200um.
The device for preparing the PP material with high gloss, low VOC and scratch resistance sequentially comprises a machine barrel and a machine head which are connected with each other, wherein a screw rod which is matched with the machine barrel to work is rotatably arranged in the machine barrel, and the material is conveyed forwards through the rotation of the screw rod. The machine barrel consists of a conveying section, an extraction melting section and a plasticizing section; the conveying section is divided into a zone 1, a zone 2 and a zone 3, and the main feeding port is arranged on the zone 1; the extraction melting section is divided into a 4 zone, a 5 zone, a 6 zone and a 7 zone, and a vacuum port I is arranged on the 7 zone; the plasticizing section is divided into an 8 area, a 9 area, a 10 area, an 11 area and a 12 area, a side feeding port is arranged on the 8 area, a vacuum port II is arranged on the 10 area, a pearlescent resin feeding device is arranged on the 11 area, and the 12 area is connected with a machine head.
The pearly-lustre resin feed arrangement includes that weightless title and bottom install the storage silo of gate valve, gate valve and weightless title signal connection, and the bottom of storage silo is connected with the title feed bin, and the sensor with weightless title signal connection is installed to title feed bin both sides, and the bottom of title feed bin is connected with vibration feed mechanism, installs electromagnetic vibration exciter and drive cell body between weightless title and the vibration feed mechanism, and electromagnetic vibration exciter is connected with drive cell body. The vibration feeding mechanism comprises a vibration bin communicated with the weighing bin, a vibration slideway arranged at the bottom of the vibration bin, and a vibrator arranged on the vibration bin and connected with the electromagnetic vibration exciter through signals. The vibration feeding mechanism utilizes the principle of electromagnetic vibration to horizontally and forwards convey materials. The electromagnetic vibration exciter drives the vibration bin on the vibration feeding mechanism to vibrate and discharge through the driving groove body.
When the sensors at the two sides of the weighing bin detect that the materials are lower than the preset lower limit, opening a gate valve to supplement the materials from the storage bin; when the sensors on the two sides of the weighing bin detect that the materials are higher than the preset upper limit, the gate valve is closed to stop feeding. When the material flow is smaller than the set value, the sensor of the weighing bin sends out a signal, so that the vibration frequency of the electromagnetic vibration exciter is increased, and the vibration feeding mechanism is driven to increase the feeding quantity until the balance position. The electromagnetic vibration exciter adjusts the vibration speed of the vibrator on the vibration bin according to the flow of the material, so that the damage to the integrity of the pearlescent resin in the traditional screw rotation feeding process is reduced, the pearlescent resin can be stably distributed in the PP, the integrity of the size is greatly improved, and the glossiness is greatly improved.
Example 1
The preparation method of the high-gloss, low-VOC and scratch-resistant PP material shown in the figure 1 comprises the following steps:
A. weighing 95.4 parts of PP resin, 0.1 part of glass pearl powder, 0.1 part of polyether modified silicone oil, 2.0 parts of extractant, 1.0 part of adsorbent, 0.4 part of heat stabilizer (antioxidant 1010 and 168 respectively 0.2 part) and 1.0 part of silicone powder for later use;
B. mixing PP resin, polyether modified silicone oil, an extractant, a heat stabilizer and silicone powder which are weighed according to the proportion, adding the mixture into a machine barrel, enabling the mixture to pass through a conveying section of the machine barrel through a screw with the screw speed of 400rpm, respectively controlling the temperatures of a conveying section 1 area, a conveying section 2 area and a conveying section 3 area to be 50 ℃, 60 ℃ and 70 ℃, respectively controlling the temperatures of an extraction melting section 4 area, a polyether modified silicone oil 5 area, an extraction melting section 6 area and a heating section 7 area to be 170 ℃, 180 ℃, 190 ℃ and 200 ℃ respectively, fully extracting, and then carrying out vacuum extraction through a vacuum port I on the 7 area, wherein the vacuum degree of the vacuum port I is-0.08 MPa;
C. the melted mixture enters a plasticizing section of a machine barrel for plasticizing treatment, the temperatures of a plasticizing section 8 area, a plasticizing section 9 area, a plasticizing section 10 area, a plasticizing section 11 area and a plasticizing section 12 area are respectively 200 ℃, 210 ℃, 220 ℃, 230 ℃ and 230 ℃, simultaneously, an adsorbent is added through a side feeding port on the plasticizing section 8, vacuum extraction is carried out again through a vacuum port II on the plasticizing section 10, the pearl powder glass is added through a pearl resin feeding device shown in figure 2 and close to a machine head 11 area, the vacuum degree of the vacuum port II is-0.08 MPa, and the working principle of the pearl resin feeding device is shown in figure 3;
D. finally, the mixture after cooling and solidification is processed by vacuum material drying to prepare the PP material with high gloss, low VOC and scratch resistance.
Example 2
A preparation method of a PP material with high gloss, low VOC and scratch resistance comprises the following steps:
A. 94.3 parts of PP resin, 0.2 part of glass pearl powder, 0.1 part of polyether modified silicone oil, 2.0 parts of extractant, 1.0 part of adsorbent, 0.4 part of heat stabilizer (antioxidant 1010 and 168 respectively 0.2 part) and 2.0 parts of silicone powder are weighed for standby;
B. mixing PP resin, polyether modified silicone oil, an extractant, a heat stabilizer and silicone powder which are weighed according to the proportion, adding the mixture into a machine barrel, enabling the mixture to pass through a conveying section of the machine barrel through a screw with the screw speed of 400rpm, respectively controlling the temperatures of a conveying section 1 area, a conveying section 2 area and a conveying section 3 area to be 50 ℃, 60 ℃ and 70 ℃, respectively controlling the temperatures of an extraction melting section 4 area, a heating section 5 area, a heating section 6 area and a heating section 7 area to be 170 ℃, 180 ℃, 200 ℃ and 200 ℃ respectively, fully extracting, and then carrying out vacuum extraction through a vacuum port I on the heating section 7 area, wherein the vacuum degree of the vacuum port I is-0.08 MPa;
C. the melted mixture enters a plasticizing section of a machine barrel for plasticizing treatment, the temperatures of a plasticizing section 8 area, a plasticizing section 9 area, a plasticizing section 10 area, a plasticizing section 11 area and a plasticizing section 12 area are respectively 200 ℃, 210 ℃, 220 ℃, 230 ℃ and 230 ℃, simultaneously, an adsorbent is added through a side feeding port on the plasticizing section 8, vacuum extraction is carried out again through a vacuum port II on the plasticizing section 10, the pearl powder glass is added through a pearl resin feeding device close to a machine head 11 area, and the vacuum degree of the vacuum port II is-0.08 MPa;
D. finally, the mixture after cooling and solidification is processed by vacuum material drying to prepare the PP material with high gloss, low VOC and scratch resistance.
Example 3
A preparation method of a PP material with high gloss, low VOC and scratch resistance comprises the following steps:
A. 94.3 parts of PP resin, 0.2 part of synthetic pearl powder, 0.1 part of polyether modified silicone oil, 2.0 parts of extractant, 1.0 part of adsorbent, 0.4 part of heat stabilizer (antioxidant 1010 and 168 respectively 0.2 part) and 2.0 parts of silicone powder are weighed for standby;
B. mixing PP resin, polyether modified silicone oil, an extractant, a heat stabilizer and silicone powder which are weighed according to the proportion, adding the mixture into a machine barrel, enabling the mixture to pass through a conveying section of the machine barrel through a screw with the screw speed of 400rpm, respectively controlling the temperatures of a conveying section 1 area, a conveying section 2 area and a conveying section 3 area to be 50 ℃, 60 ℃ and 70 ℃, respectively controlling the temperatures of an extraction melting section 4 area, a polyether modified silicone oil 5 area, an extraction melting section 6 area and a heating section 7 area to be 170 ℃, 180 ℃, 190 ℃ and 200 ℃ respectively, fully extracting, and then carrying out vacuum extraction through a vacuum port I on the 7 area, wherein the vacuum degree of the vacuum port I is-0.08 MPa;
C. the melted mixture enters a plasticizing section of a machine barrel for plasticizing treatment, the temperatures of a plasticizing section 8 area, a plasticizing section 9 area, a plasticizing section 10 area, a plasticizing section 11 area and a plasticizing section 12 area are respectively 200 ℃, 210 ℃, 220 ℃, 230 ℃ and 230 ℃, simultaneously, an adsorbent is added from a side feeding port on the plasticizing section 8, vacuum extraction is carried out again through a vacuum port II on the plasticizing section 10, the synthetic pearl powder is added through a pearl resin feeding device close to a machine head 11 area, and the vacuum degree of the vacuum port II is-0.08 MPa;
D. finally, the mixture after cooling and solidification is processed by vacuum material drying to prepare the PP material with high gloss, low VOC and scratch resistance.
Comparative example 1
A preparation method of a PP material with high gloss, low VOC and scratch resistance comprises the following steps:
A. 94.3 parts of PP resin, 0.2 part of synthetic pearl powder, 0.1 part of polyether modified silicone oil, 2.0 parts of extractant, 1.0 part of adsorbent, 0.4 part of heat stabilizer (antioxidant 1010 and 168 respectively 0.2 part) and 2.0 parts of silicone powder are weighed for standby;
B. mixing PP resin, artificially synthesized pearl powder, polyether modified silicone oil, an extracting agent, a heat stabilizer, silicone powder and an adsorbent which are weighed according to the proportion, adding the mixture into a machine barrel, enabling the mixture to pass through a conveying section of the machine barrel through a screw, wherein the rotating speed of the screw is 400rpm, the temperatures of a zone 1, a zone 2 and a zone 3 of the conveying section are respectively 50 ℃, 60 ℃ and 70 ℃, then entering the temperatures of a zone 4, a zone 5, a zone 6 and a zone 7 of an extraction melting section of the machine barrel are respectively 170 ℃, 180 ℃, 190 ℃ and 200 ℃, and carrying out vacuum extraction through a vacuum port I on the zone 7 after full extraction, wherein the vacuum degree of the vacuum port I is-0.08 MPa;
C. the melted mixture enters a plasticizing section of a machine barrel for plasticizing treatment, the temperatures of a plasticizing section 8 area, a plasticizing section 9 area, a plasticizing section 10 area, a plasticizing section 11 area and a plasticizing section 12 area are respectively 200 ℃, 210 ℃, 220 ℃, 230 ℃ and 230 ℃, vacuum extraction is carried out again through a vacuum port II on the plasticizing section 10, and the vacuum degree of the vacuum port II is-0.08 MPa;
D. finally, the mixture after cooling and solidification is processed by vacuum material drying to prepare the PP material with high gloss, low VOC and scratch resistance.
Comparative example 2
A preparation method of a PP material with high gloss, low VOC and scratch resistance comprises the following steps:
A. 92.5 parts of PP resin, 2.0 parts of synthetic pearl powder, 0.1 part of polyether modified silicone oil, 2.0 parts of extractant, 1.0 part of adsorbent, 0.4 part of heat stabilizer (antioxidant 1010 and 168 respectively 0.2 part) and 2.0 parts of silicone powder are weighed for standby;
B. mixing PP resin, artificially synthesized pearl powder, polyether modified silicone oil, an extractant, polyol wax, silicone powder and an adsorbent which are weighed according to the proportion, adding the mixture into a machine barrel, enabling the mixture to pass through a conveying section of the machine barrel through a screw, wherein the rotating speed of the screw is 400rpm, the temperatures of a conveying section 1 area, a conveying section 2 area and a conveying section 3 area are respectively 50 ℃, 60 ℃ and 70 ℃, then entering an extraction melting section 4 area, a 5 area, a 6 area and a 7 area of the machine barrel respectively at 170 ℃, 180 ℃, 190 ℃ and 200 ℃, and carrying out vacuum extraction through a vacuum port I on the 7 area after full extraction, wherein the vacuum degree of the vacuum port I is-0.08 MPa;
C. the melted mixture enters a plasticizing section of a machine barrel for plasticizing treatment, the temperatures of a plasticizing section 8 area, a plasticizing section 9 area, a plasticizing section 10 area, a plasticizing section 11 area and a plasticizing section 12 area are respectively 200 ℃, 210 ℃, 220 ℃, 230 ℃ and 230 ℃, vacuum extraction is carried out again through a vacuum port II on the plasticizing section 10, and the vacuum degree of the vacuum port II is-0.08 MPa;
D. finally, the mixture after cooling and solidification is processed by vacuum material drying to prepare the PP material with high gloss, low VOC and scratch resistance.
In order to examine the performance of the high-gloss, low-VOC and scratch-resistant PP material prepared by the invention, the obtained composite material is placed in an injection molding machine and is molded into standard test bars according to the conventional injection molding process conditions for the following performance test. Specifically as shown in table 1:
table 1 table of PP material properties in examples and comparative examples
As can be seen from the comparison of Table 1, the gloss of examples 1 to 3 is greatly improved over comparative examples 1 to 2 at the same pearlescent resin content. The odor grade, TOVC, impact toughness and processability are all greatly improved. The main reason is that the pearl resin is added from the pearl resin feeding device near the head end of the extruder in the preparation process of the scratch-resistant PP material, so that the dimensional integrity of the pearl resin is greatly reserved in the preparation process, and a considerable part of the pearl resin is selectively dispersed on the surface layer of the plastic, the content of the pearl resin on the surface layer is improved, and the glossiness of the PP material is greatly improved; the content of the surface layer pearlescent resin is increased, and the scratch resistance of the inorganic pearlescent resin is far higher than that of the organic PP resin, so that the scratch resistance of the inorganic pearlescent resin is improved to a certain extent. Under the condition of the same glossiness (as in the example 1 and the comparative example 2), the total addition amount of the pearlescent resin is smaller by adopting the method of the invention, and the impact toughness and the processability of the prepared material are greatly improved compared with those of the material prepared by the traditional method. In addition, the extractant and the adsorbent added from the side feed are adopted, so that the functions of the extractant and the adsorbent are fully exerted, and the negative effects of the extractant and the adsorbent are reduced, thereby effectively improving the odor and the TVOC.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (6)
1. The high-gloss, low-VOC and scratch-resistant PP material is characterized by comprising the following raw materials in parts by weight: PP resin: 91-98.0 parts; pearlescent resin: 0.1 to 2.0 parts; silicone oil: 0.05 to 0.1 part; the extractant comprises: 0.5 to 2.0 parts; an adsorbent: 0.5 to 1.0 part; heat stabilizer: 0.2 to 0.6; scratch resistant agent: 0.5 to 3.0 parts;
the preparation method of the PP material with high gloss, low VOC and scratch resistance comprises the following steps:
A. weighing PP resin, pearlescent resin, silicone oil, extractant, adsorbent, heat stabilizer and scratch-resistant agent for standby;
B. mixing PP resin, silicone oil, an extractant, a heat stabilizer and a scratch-resistant agent which are weighed according to the proportion, adding the mixture through a main feeding port, enabling the mixture to pass through a conveying section of a machine barrel firstly through a screw rod, then entering an extraction melting section of the machine barrel for heating and melting, and carrying out vacuum extraction through a vacuum port I on the melting section after full extraction;
C. the melted mixture enters a plasticizing section of a machine barrel for plasticizing treatment, meanwhile, an adsorbent is added through a side feeding port, vacuum extraction is carried out again through a vacuum port II on the plasticizing section, and the pearlescent resin is added through a pearlescent resin feeding device close to a machine head;
D. finally, the mixture after cooling and solidification is processed by vacuum material drying to prepare a PP material with high gloss, low VOC and scratch resistance;
the preparation device of the high-gloss, low-VOC and scratch-resistant PP material sequentially comprises an extruder barrel and a machine head which are connected with each other, wherein a screw rod which is matched with the barrel to work is arranged in the barrel, and the barrel consists of a conveying section, an extraction melting section and a plasticizing section; the front end of the conveying section is provided with a main feeding port; the tail end of the extraction melting section is provided with a vacuum port I; the front end of the plasticizing section is provided with a side feeding port, the middle part of the plasticizing section is provided with a vacuum port II, and the plasticizing section is provided with a pearlescent resin feeding device close to the head end of the machine;
the pearlescent resin feeding device comprises a weightless scale and a storage bin with a gate valve arranged at the bottom, the gate valve is in signal connection with the weightless scale, the bottom of the storage bin is connected with a scale bin, sensors in signal connection with the weightless scale are arranged at two sides of the scale bin, the bottom of the scale bin is connected with a vibration feeding mechanism, an electromagnetic vibration exciter and a driving groove body are arranged between the weightless scale and the vibration feeding mechanism, and the electromagnetic vibration exciter is connected with the driving groove body;
the vibration feeding mechanism comprises a vibration bin communicated with the weighing bin, a vibration slideway arranged at the bottom of the vibration bin and a vibrator which is arranged on the vibration bin and is in signal connection with the electromagnetic vibration exciter.
2. The high gloss, low VOC, scratch resistant PP material of claim 1 wherein said pearlescent resin is one of glass pearlescent powder or synthetic pearlescent powder; the silicone oil is polyether modified silicone oil; the extractant is one or a mixture of more than two of an alkaline extractant and an acidic extractant; the adsorbent is one or a mixture of more than two of a synthetic adsorbent and a natural inorganic adsorbent, the heat stabilizer is one or two of an antioxidant 1010 and an antioxidant 168, and the scratch-resistant agent is silicone.
3. A process for the preparation of a high gloss, low VOC, scratch resistant PP material according to any one of claims 1-2, characterized by the steps of:
A. weighing PP resin, pearlescent resin, silicone oil, extractant, adsorbent, heat stabilizer and scratch-resistant agent for standby;
B. mixing PP resin, silicone oil, an extractant, a heat stabilizer and a scratch-resistant agent which are weighed according to the proportion, adding the mixture through a main feeding port, enabling the mixture to pass through a conveying section of a machine barrel firstly through a screw rod, then entering an extraction melting section of the machine barrel for heating and melting, and carrying out vacuum extraction through a vacuum port I on the melting section after full extraction;
C. the melted mixture enters a plasticizing section of a machine barrel for plasticizing treatment, meanwhile, an adsorbent is added through a side feeding port, vacuum extraction is carried out again through a vacuum port II on the plasticizing section, and the pearlescent resin is added through a pearlescent resin feeding device close to a machine head;
D. finally, the mixture after cooling and solidification is processed by vacuum material drying to prepare a PP material with high gloss, low VOC and scratch resistance;
the preparation device of the high-gloss, low-VOC and scratch-resistant PP material sequentially comprises an extruder barrel and a machine head which are connected with each other, wherein a screw rod which is matched with the barrel to work is arranged in the barrel, and the barrel consists of a conveying section, an extraction melting section and a plasticizing section; the front end of the conveying section is provided with a main feeding port; the tail end of the extraction melting section is provided with a vacuum port I; the front end of the plasticizing section is provided with a side feeding port, the middle part of the plasticizing section is provided with a vacuum port II, and the plasticizing section is provided with a pearlescent resin feeding device close to the head end of the machine;
the pearlescent resin feeding device comprises a weightless scale and a storage bin with a gate valve arranged at the bottom, the gate valve is in signal connection with the weightless scale, the bottom of the storage bin is connected with a scale bin, sensors in signal connection with the weightless scale are arranged at two sides of the scale bin, the bottom of the scale bin is connected with a vibration feeding mechanism, an electromagnetic vibration exciter and a driving groove body are arranged between the weightless scale and the vibration feeding mechanism, and the electromagnetic vibration exciter is connected with the driving groove body;
the vibration feeding mechanism comprises a vibration bin communicated with the weighing bin, a vibration slideway arranged at the bottom of the vibration bin and a vibrator which is arranged on the vibration bin and is in signal connection with the electromagnetic vibration exciter.
4. The method for producing a high gloss, low VOC, scratch resistant PP material of claim 3 wherein the temperature of the conveying section of the barrel in step B is 50-70 ℃; the temperature of the extraction melting section of the machine barrel increases gradually along the screw precession direction within 170-200 ℃; the plasticizing section temperature of the machine barrel increases gradually in the screw precession direction within 200-230 ℃.
5. The method for producing a high gloss, low VOC, scratch resistant PP material according to claim 3, wherein the vacuum degree at vacuum port i and vacuum port ii is-0.08 MPa or less.
6. The method for producing a high gloss, low VOC, scratch resistant PP material of claim 3 wherein said screw speed is 350 to 420rpm.
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