Polycarbonate screw cleaning agent and preparation method thereof

Abstract

The invention discloses a polycarbonate screw cleaning agent and a manufacturing method thereof, and relates to the technical field of high polymer materials, the polycarbonate screw cleaning agent comprises the following components in percentage by mass: 57-63% of polycarbonate, 36.3-42.3% of filler, 0.4% of an antioxidant and 0.1% of a lubricant, and the mass percent of the lubricant is 0.3%. According to the polycarbonate screw cleaning agent, on the original basis, a foaming agent is improved, powdery alpha aluminum oxide is selected as a grinding material, meanwhile, a small amount of swelling agent is added, aluminum carbonate is foamed, so that the cleaning agent can make full contact with the interior of a screw extruder, and in the cleaning agent process, the foaming effect is good; according to the present invention, the alpha alumina grinds the carbon deposit and the stubborn impurities remaining on the screw rod and the wall surface to a certain extent, the selected alpha alumina with the fine particle size has almost no damage to the equipment, and the swelling agent can easily clean the remaining organic matters through the swelling effect, and can well directly carry the remaining organic matters through the adhesion of the resin;

Description

Technical Field

[0001] The invention relates to the technical field of polymer materials, and in particular to a polycarbonate screw cleaning agent and a preparation method thereof. Background Art

[0002] In screw extruders, every time a new batch of products is produced, in order to avoid the previous batch of raw materials affecting the color and properties of the products, it is often necessary to clean out the residual raw materials in the screw extruder. Traditional liquid cleaning agents often have strong acidity and alkalinity, which will not only corrode the screw and inner wall of the screw extruder, but also have unsatisfactory cleaning effects, and even require the device to be disassembled for deep cleaning.

[0003] After searching, the patent application number CN200510100486.7 provides a plastic screw cleaning agent and its preparation and use method, the cleaning agent includes fatty alcohol polyoxyethylene sulfate sodium, dodecylbenzene sulfonate sodium, coconut oil diethanolamide, dimethyl siloxane, isopropyl alcohol, emulsifier and deionized water, and the emulsifier is nonylphenol polyoxyethylene ether TX-10 type emulsifier. The cleaning agent prepared by the above technical solution has strong permeability and activation, quickly dissolves the pigment in the residual raw material, and has a good decolorization effect, and has the characteristics of less material, short time, clean cleaning and wide range of use. And a screw cleaning agent and its preparation process provided by patent application number CN201210153665.7, the raw material formula of the screw cleaning agent basically consists of: 50-70% base resin, 15-25% modified powder, and 15-25% auxiliary agent; the base resin is a mixture of one or more of phenolic resin, polystyrene, and polycarbonate; the raw material formula of the modified powder basically consists of: 70-90% inorganic powder, 4-12% dispersant, and 6-18% coupling agent, the inorganic powder is a mixture of one or more of titanium dioxide, silicon carbide, and boron nitride, and the dispersant is a mixture of one or more of sodium dodecyl sulfate, methyl amyl alcohol, and polyacrylamide. The advantages of the screw cleaning agent are that it can quickly dissolve stains, has a fast cleaning speed, and is not costly.

[0004] Based on the above search and in combination with the prior art, it is found that the screw cleaning agents disclosed above in the prior art are difficult to remove the insoluble stains attached to the surface of the machine body, resulting in poor cleaning effect. The insoluble stains attached to the surface of the machine body still need to be cleaned additionally, which is troublesome. Therefore, a polycarbonate screw cleaning agent and a manufacturing method thereof are proposed to improve the above problems. Summary of the invention

[0005] The purpose of the present application is to provide a polycarbonate screw cleaning agent and a method for manufacturing the same, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a polycarbonate screw cleaning agent, comprising polycarbonate, a filler, an antioxidant and a lubricant;

[0007] Wherein, the mass percentage of the polycarbonate is 57-63%, the mass percentage of the filler is 36.3%-42.3%, the mass percentage of the antioxidant is 0.4%, and the mass percentage of the lubricant is 0.3%;

[0008] Wherein, the filler includes abrasive, catalyst, coupling agent and swelling agent;

[0009] The mass percentage of the abrasive is 26-30%, the mass percentage of the catalyst is 10-12%, the mass percentage of the coupling agent is 0.2%, and the mass percentage of the swelling agent is 0.1%.

[0010] As a further supplement to this solution, the polycarbonate screw cleaning agent is mixed and foamed with aluminum carbonate.

[0011] As a further supplement to this solution, the abrasive is α-alumina.

[0012] As a further supplement to this solution, the catalyst is aluminum sulfate.

[0013] As a further supplement to this solution, the coupling agent is an aluminate coupling agent.

[0014] As a further supplement to this solution, the swelling agent is zinc oxide.

[0015] As a further supplement to this solution, the antioxidant includes phenyl triphosphite and β-octadecyl propionate.

[0016] As a further supplement to this solution, the lubricant is calcium silicate.

[0017] A method for preparing a polycarbonate screw cleaning agent comprises the following steps:

[0018] S1, adding the polycarbonate, filler, antioxidant and lubricant into a high-speed mixer according to their respective mass percentages, and stirring at a temperature of 80-110° C. for 10-15 minutes;

[0019] S2, melt-extrude the materials mixed by the high-speed mixer through a screw extruder;

[0020] S3, solidifying the molten extruded material through water cooling, and finally shearing and granulating.

[0021] As a further supplement to this solution, in S2, the melt volume flow rate is 4.5 cm 3 / 10min;

[0022] In S3, the granulation density is 1200kg / m 3 .

[0023] In summary, the technical effects and advantages of the present invention are as follows:

[0024] 1. In the present invention, the cleaning agent improves the foaming agent on the original basis, selects powdered α-alumina as abrasive, and adds a small amount of swelling agent. By foaming aluminum carbonate, the cleaning agent can fully contact the inside of the screw extruder. In the cleaning process, the α-alumina grinds the carbon deposits and stubborn impurities remaining on the screw and the wall surface. The α-alumina with fine particle size is selected, which has almost no damage to the equipment. The swelling agent can easily wash away the residual organic matter through the swelling effect, and directly carry it out through the adhesion of the resin.

[0025] 2. In the present invention, the solid cleaning agent containing resin not only has the carrying capacity of the resin, but also the abrasive inside can make the cleaning ability stronger. Under the foaming action of the swelling agent and aluminum carbonate, the cleaning agent can completely fill the inside of the screw extruder and effectively remove the residual black spots and resin. Moreover, the cleaning agent has low cost and easy-to-obtain raw materials; the cleaning effect is good and there is no corrosion to the screw and the inner wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 The present invention is a flow chart of a method for preparing a polycarbonate screw cleaning agent. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Example 1: The polycarbonate screw cleaning agent in this embodiment is prepared from the following raw materials in percentage by mass, as shown in Table 1 below:

[0030] Polycarbonate 63%, α-alumina 26%, aluminum sulfate 10%, aluminate coupling agent 0.2%, zinc oxide 0.1%, phenyl triphosphite and β-octadecyl propionate 0.4%, calcium silicate 0.3%.

[0031] The above raw materials were added into a high-speed mixer according to their respective mass percentages, stirred at 80-110°C for 10-15 minutes, sieved and added into a screw extruder for melt extrusion, wherein the melt volume flow rate was ensured to be 4.5 cm 3 / 10min, after water cooling, it is granulated by a granulator, and the granulation density is 1200kg / m 3 , that is, a polycarbonate screw cleaning agent is obtained.

[0032] After the polycarbonate screw cleaning agent prepared by using the raw material ratio in this embodiment is used to clean the screw extruder, a small amount of black spots still remain.

[0033]

[0034] Table 1

[0035] Example 2: The polycarbonate screw cleaning agent in this embodiment is prepared from the following raw materials in percentage by mass, as shown in Table 2 below:

[0036] Polycarbonate 60%, alpha alumina 28%, aluminum sulfate 11%, aluminate coupling agent 0.2%, zinc oxide 0.1%, antioxidant 0.4%, calcium silicate 0.3%.

[0037] The above raw materials were added into a high-speed mixer according to their respective mass percentages, stirred at 80-110°C for 10-15 minutes, sieved and added into a screw extruder for melt extrusion, wherein the melt volume flow rate was ensured to be 4.5 cm 3 / 10min, after water cooling, it is granulated by a granulator, and the granulation density is 1200kg / m 3 , that is, a polycarbonate screw cleaning agent is obtained.

[0038] After the polycarbonate screw cleaning agent prepared by using the raw material ratio in this embodiment is used to clean the screw extruder, no black spots remain.

[0039]

[0040] Table 2

[0041] Example 3: The polycarbonate screw cleaning agent in this embodiment is prepared from the following raw materials in percentage by mass, as shown in Table 3 below:

[0042] Polycarbonate 57%, alpha alumina 30%, aluminum sulfate 12%, aluminate coupling agent 0.2%, zinc oxide 0.1%, antioxidant 0.4%, calcium silicate 0.3%.

[0043] The above raw materials were added into a high-speed mixer according to their respective mass percentages, stirred at 80-110°C for 10-15 minutes, sieved and added into a screw extruder for melt extrusion, wherein the melt volume flow rate was ensured to be 4.5 cm 3 / 10min, after water cooling, it is granulated by a granulator, and the granulation density is 1200kg / m 3 , that is, a polycarbonate screw cleaning agent is obtained.

[0044] After the polycarbonate screw cleaning agent prepared by using the raw material ratio in this embodiment is used to clean the screw extruder, a small amount of black spots still remain.

[0045]

[0046] Table 3

[0047] Through the above experimental results, it is found that suitable α-alumina and aluminum sulfate can significantly improve the cleaning effect of the screw extruder. The product after cleaning with the traditional cleaning agent has noticeable black spots, while after cleaning with this cleaning agent, no black spots can be found on the product at all. In addition, 28% α-alumina and 11% aluminum sulfate can more significantly improve the cleaning effect of the screw extruder.

[0048] On the basis of the original cleaning agent, the foaming agent is improved, powdered α-alumina is selected as the abrasive, and a small amount of swelling agent is added. By foaming the aluminum carbonate, the cleaning agent can fully contact the inside of the screw extruder. During the cleaning process, the α-alumina grinds the carbon deposits and stubborn impurities remaining on the screw and the wall. The α-alumina with fine particle size is selected, which has almost no damage to the equipment. The swelling agent can easily wash away the residual organic matter through the swelling effect, and can be directly carried out through the better adhesion of the resin.

[0049] In contrast, the solid cleaning agent containing resin not only has the carrying capacity of the resin, but also has a stronger cleaning ability due to the abrasive inside. Under the foaming action of the swelling agent and aluminum carbonate, the cleaning agent can completely fill the inside of the screw extruder and effectively remove the residual black spots and resin. In addition, the formula of the solid cleaning agent also contains a variety of surfactants, enzymes and additives, which can enhance the cleaning effect, reduce the cleaning time and improve the cleaning efficiency. Moreover, the cleaning agent has low cost and easy to obtain raw materials; it has good cleaning effect and does not corrode the screw and the inner wall.

[0050] The present invention improves the foaming method, and increases the contact degree between the cleaning agent and the inside of the screw by foaming with aluminum carbonate, so that the cleaning agent can fully fill the entire machine. During the extrusion process, the abrasive grinds the residual substances on the wall. Under specific temperature, pressure and rotation speed, the adhesion of the resin can bring out the impurities, thereby achieving a better cleaning effect on the screw.

[0051] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A polycarbonate screw cleaning agent, characterized in that: Includes polycarbonate, filler, antioxidant and lubricant; Wherein, the mass percentage of the polycarbonate is 57-63%, the mass percentage of the filler is 36.3%-42.3%, the mass percentage of the antioxidant is 0.4%, and the mass percentage of the lubricant is 0.3%; Wherein, the filler includes abrasive, catalyst, coupling agent and swelling agent; The mass percentage of the abrasive is 26-30%, the mass percentage of the catalyst is 10-12%, the mass percentage of the coupling agent is 0.2%, and the mass percentage of the swelling agent is 0.1%.

2. A polycarbonate screw cleaning agent according to claim 1, characterized in that: The polycarbonate screw cleaning agent is foamed by mixing with aluminum carbonate.

3. A polycarbonate screw cleaning agent according to claim 1, characterized in that: The abrasive is alpha alumina.

4. A polycarbonate screw cleaning agent according to claim 1, characterized in that: The catalyst is aluminum sulfate.

5. The polycarbonate screw cleaning agent according to claim 1, characterized in that: The coupling agent is an aluminate coupling agent.

6. A polycarbonate screw cleaning agent according to claim 1, characterized in that: The swelling agent is zinc oxide.

7. A polycarbonate screw cleaning agent according to claim 1, characterized in that: The antioxidants include phenyl triphosphite and β-octadecyl propionate.

8. The polycarbonate screw cleaning agent according to claim 1, characterized in that: The lubricant is calcium silicate.

9. A method for producing a polycarbonate screw cleaning agent as claimed in claim 1, characterized in that: The following steps are involved: S1, adding the polycarbonate, filler, antioxidant and lubricant into a high-speed mixer according to their respective mass percentages, and stirring at a temperature of 80-110° C. for 10-15 minutes; S2, melt-extrude the materials mixed by the high-speed mixer through a screw extruder; S3, solidifying the molten extruded material through water cooling, and finally shearing and granulating.

10. The method for producing a polycarbonate screw cleaning agent according to claim 9, characterized in that: In S2, the melt volume flow rate is 4.5 cm 3 / 10min; In S3, the granulation density is 1200kg / m 3 .

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