Glass polishing brush, method of glass polishing and use of polytrimethylene terephthalate filaments for glass polishing

Abstract

This invention discloses a glass polishing brush, comprising a brush body and bristles distributed on the surface of the brush body. The bristles contain PTT monofilaments. A method for polishing glass using the glass polishing brush is also provided, preferably in combination with a cerium oxide polishing solution. This invention also discloses the use of PTT monofilaments for glass polishing, wherein the diameter of the PTT monofilaments is 4 mil to 30 mil. The glass polishing brush of this invention achieves effective polishing of the glass surface, resulting in a smoother and more even glass surface. Furthermore, compared to other monofilaments, PTT monofilaments do not create numerous deep grooves at the chamfered edges of the glass during the polishing process.

Description

Technical Field

[0001] This invention relates to the field of glass polishing, and particularly to a glass polishing brush, a method for polishing glass using the brush, and the use of polypropylene terephthalate monofilament for glass polishing. Background Technology

[0002] The glass processing industry alters the shape of glass workpieces through processes such as cutting, grinding, and hot bending. Examples of glass workpieces include the cover glass and back cover glass of mobile phones. These processes can cause the surface of the glass workpiece to become rough or deformed. Therefore, a polishing process is necessary after these processing steps to make the surface of the glass workpiece smooth and flat. In the polishing process, to preserve certain delicate structural features, such as chamfered edges and curved surfaces, a brush is used. During polishing, a dispersion of polishing particles, typically an aqueous dispersion of cerium oxide particles, is sprayed onto the surface of the brush bristles. The brush carrying the dispersion of polishing particles rotates at a certain speed and comes into contact with the glass workpiece. Through the physical and chemical interactions between the polishing particles and the glass, the glass on the workpiece surface is removed, achieving the polishing effect.

[0003] Polishing brushes typically use animal hair, especially hog bristles, to polish glass workpieces. While hog bristle brushes are highly efficient at removing glass, hog bristles have several drawbacks. Hog bristles are a natural product, and their quality fluctuates greatly. Furthermore, the supply of hog bristles has been highly unstable due to outbreaks of swine flu. To address the quality and supply issues of hog bristles, the glass processing industry has begun to use synthetic polymer monofilaments as a substitute. Commonly used synthetic polymer monofilament materials include polyhexamethylene adipate (nylon 66), polyhexamethylene sebacic acid (nylon 610), polyhexamethylene dodecanoate (nylon 612), and polybutylene terephthalate (PBT). The quality control of these synthetic polymer monofilaments is superior to that of hog bristles, and their supply chains are also more stable.

[0004] However, brushes made of synthetic polymer monofilaments are far less efficient at removing glass than pig bristles. This necessitates extending the already time-consuming polishing process to ensure the glass workpiece achieves the required flatness and smoothness. This extended polishing time directly leads to decreased production efficiency and increased costs for glass workpieces.

[0005] In response to the aforementioned problems in the existing technology, the inventors, through extensive research and experimentation, unexpectedly discovered that when polishing glass workpieces using a brush containing polypropylene terephthalate (PTT) monofilaments, a smooth and even surface can be obtained in a shorter time, thereby improving the production efficiency of glass workpieces and reducing production costs. Summary of the Invention

[0006] This invention provides a glass polishing brush, the brush comprising a brush body and bristles distributed on the surface of the brush body, the bristles comprising PTT monofilaments, preferably made of PTT monofilaments, the diameter of the PTT monofilaments being 4mil-30mil, preferably 4mil-20mil, even more preferably 6mil-20mil, more preferably 7mil-14mil, even more preferably 4mil-10mil, particularly preferably 5mil-9mil, and even more particularly preferably 7mil-8mil, wherein 1mil equals 0.0254mm.

[0007] This invention provides a method for polishing glass, comprising using a glass polishing brush, the brush comprising a brush body and bristles distributed on the surface of the brush body, the bristles comprising PTT monofilaments, preferably made of PTT monofilaments, the diameter of the PTT monofilaments being 4mil-30mil, preferably 4mil-20mil, even more preferably 6mil-20mil, more preferably 7mil-14mil, even more preferably 4mil-10mil, particularly preferably 5mil-9mil, and even more particularly preferably 7mil-8mil. The method of polishing glass of this invention also preferably uses a combination of the glass polishing brush and a polishing liquid containing polishing particles, wherein the polishing particles are preferably cerium oxide particles, more preferably cerium oxide particles with an average particle size of 1.0-2.3 micrometers, and the concentration of the cerium oxide polishing liquid is 40-150 g / L.

[0008] This invention provides the use of PTT monofilaments for glass polishing, wherein the PTT monofilaments are used as bristles of a glass polishing brush, and the content of the PTT monofilaments, based on the total weight of the bristles, is greater than or equal to 70% by weight, preferably greater than or equal to 80% by weight, more preferably greater than or equal to 90% by weight, particularly preferably greater than or equal to 99% by weight, especially preferably 100% by weight, and the diameter of the PTT monofilaments is 4mil-30mil, preferably 4mil-20mil, even more preferably 6mil-20mil, more preferably 7mil-14mil, even more preferably 4mil-10mil, especially preferably 5mil-9mil, and even more preferably 7mil-8mil.

[0009] The glass polishing brush of the present invention achieves effective polishing of the glass surface, resulting in a smoother and more even glass surface. Compared with other monofilaments, PTT monofilaments do not produce a large number of deep grooves at the chamfer of the glass during the polishing process. Attached Figure Description

[0010] Figure 1 (a)-(d) are schematic diagrams of the glass polishing method according to the present invention, wherein Figure 1 (a) is the front view of the polishing mechanism. Figure 1(b) is a top view of the polishing mechanism. Figure 1 (c) is a detailed view of the glass stack “2”. Figure 1 (d) is a detail view of the glass slide “2.1”, which shows the location of the chamfer (the area circled in dashed lines).

[0011] Figure 2 (a)-(c) are typical photographs of the polishing effect at the edge of the middle part of the polished glass, respectively. Figure 2 (d) is a photograph of the edge of the unpolished raw glass as a contrast.

[0012] Figure 3 (a)-(c) are typical photos of the polishing effect at the chamfered front end of the polished glass. Detailed Implementation

[0013] While existing technologies have used polypropylene terephthalate (PTT) to prepare monofilaments, this is primarily based on the helical supramolecular crystalline aggregation of PTT, which gives it superior resilience and durability compared to nylon, leading to its use in toothbrushes, paintbrushes, and cosmetic brushes. However, considering the higher hardness and inferior mechanical properties (including tensile strength and abrasion resistance) of PTT monofilaments compared to nylon monofilaments, nylon monofilaments are generally preferred in applications requiring higher hardness, mechanical properties, and abrasion resistance. To date, there have been no attempts to utilize PTT monofilaments in glass polishing.

[0014] Those skilled in the art have unexpectedly discovered that when PTT monofilaments are used to prepare glass polishing brushes, excellent technical results can be obtained for glass polishing, especially significantly better than those of nylon 610 monofilaments, nylon 612 monofilaments, and PBT monofilaments.

[0015] Glass polishing brush

[0016] In the context of this invention, "glass polishing brush" has the same meaning as "brush" or "brush".

[0017] The glass polishing brush according to the present invention comprises a brush body and bristles distributed on the surface of the brush body. The bristles contain PTT monofilaments. Preferably, the bristles are composed of PTT monofilaments, wherein the diameter of the PTT monofilaments is 4mil-30mil, preferably 4mil-20mil, more preferably 6mil-20mil, more preferably 7mil-14mil, even more preferably 4-10mil, particularly preferably 5-9mil, and even more particularly preferably 7-8mil. Furthermore, in specific embodiments of the glass polishing brush of the present invention, the diameter of the PTT monofilaments may be 14-20mil, or 14-17mil, or 18-20mil.

[0018] This application unexpectedly discovers that when the bristles of a glass polishing brush include or are made of the PTT monofilament, and when the diameter of the PTT monofilament and / or the bristle tuft length are set within a specific range, a very good polishing effect can be achieved.

[0019] In the context of this invention, "diameter of PTT monofilament" refers to the equivalent circular diameter of the cross-sectional shape of the PTT monofilament. When the cross-section is not circular, the diameter of the smallest circle that can encompass the cross-sectional shape is used as the equivalent circular diameter of the monofilament. "Length of bristles," also known as bristle tuft length, refers to the length of the portion of the bristles exposed outside the brush body. It usually refers to the length from the outer surface of the brush body to the tip of the bristles.

[0020] In one specific embodiment of the glass polishing brush of the present invention, the diameter of the PTT monofilament is 4mil (0.102mm)-30mil (0.762mm), preferably 4mil (0.102mm)-20mil (0.508mm), even more preferably 6mil (0.152mm)-20mil (0.508mm), more preferably 7mil (0.178mm)-14mil (0.356mm), even more preferably 4mil (0.102mm) to 10mil (0.254mm), particularly preferably 5mil (0.127mm) to 9mil (0.229mm), and even more preferably 7mil (0.178mm) to 8mil (0.203mm).

[0021] In another specific embodiment of the glass polishing brush of the present invention, the bristle tuft length is 8-26 mm, preferably 12-20 mm, and more preferably 17.5 mm.

[0022] The inventors have discovered that when the diameter of the PTT monofilaments used as brush bristles is less than 4 mil, the polishing performance is compromised due to insufficient bristle stiffness. Furthermore, when the bristle bundle length exceeds 26 mm, the brush bristles also suffer from insufficient stiffness, resulting in a loss of polishing performance. Conversely, when the bundle length is less than 8 mm, the bristles, due to excessive stiffness, will grind grooves into the glass, damaging it.

[0023] There are no particular restrictions on the cross-sectional shape of the PTT monofilament. In one specific embodiment of the present invention, the cross-sectional shape of the PTT monofilament can be a symmetrical shape such as a circle, ellipse, rectangle, rhombus, triangle, hexagon, or octagon, or other asymmetrical shapes. Circular and elliptical cross-sectional shapes are preferred. Circular is more preferred. The PTT monofilament used in the present invention can be solid or designed with a hollow channel running through the monofilament along its length. There can be one channel or multiple channels inside. Solid PTT monofilaments are preferred.

[0024] In the context of this invention, "PTT monofilament" includes both monofilaments prepared from 100% PTT resin and monofilaments prepared from a mixture of 90-100% by weight PTT resin and 0-10% by weight other resins or additives. There are no particular limitations on the selection of other resins, including but not limited to polyethylene, ethylene copolymers, polypropylene, copolypropylene, polydimethylsiloxane, polymethylphenylsiloxane, polyalkylphenylsiloxane, polytetrafluoroethylene, polylactic acid, polyethylene glycol, polypropylene glycol, polymethyl acrylate, copolymers of polyacrylates, polystyrene, polystyrene copolymers, polyamide, copolyamide, polycarbonate, polyethylene terephthalate, polyethylene terephthalate-based copolyesters, polybutylene terephthalate, polyethylene terephthalate-based copolyesters, polyethylene naphthalate, etc. Additives include, but are not limited to, antioxidants, anti-hydrolysis agents, UV stabilizers, chain extenders, matting agents, nucleating agents, lubricants, plasticizers, toughening agents, pigments, and fillers. The PTT monofilament is preferably a mixture containing no more than 5% of other resins or additives, more preferably a mixture containing no more than 2% of other resins or additives, and particularly preferably a mixture containing no more than 1% of other resins or additives.

[0025] In one specific embodiment of the present invention, the intrinsic viscosity of polypropylene terephthalate in the PTT monofilament is 0.7-1.4. The intrinsic viscosity is tested according to GB / T14190-2008, using a 10 mg / ml solution prepared with a mixed solvent of phenol and 1,1,2,2-tetrachloroethane in a 50:50 mass ratio, and measured using an Ubbelohde viscometer at 30°C. Generally, PTT monofilaments with higher intrinsic viscosity exhibit better abrasion resistance than those with lower intrinsic viscosity.

[0026] There are no particular limitations on the preparation method of PTT monofilaments; PTT monofilaments obtained using methods commonly used in the art can be employed. For example, PTT monofilaments can be directly obtained using common extrusion-drawing processes. In one specific embodiment of the invention, the PTT monofilaments can undergo post-treatment, including, for example, chemical etching of the monofilament surface using an alkaline solution or physical abrasion. These post-treatment processes can increase the surface roughness of the monofilaments, improving their ability to carry polishing particles and thus enhancing the polishing effect. Alkaline treatment typically involves immersing the monofilaments in a heated, concentrated alkaline solution. The alkaline solution can be an inorganic base, such as sodium hydroxide or potassium hydroxide, or an organic base, such as methylamine, ethylamine, butylamine, hydrazine, benzylamine, ethylenediamine, hexamethylenediamine, diethyltriamine, triethyltetraamine, etc., with sodium hydroxide and potassium hydroxide being preferred. The alkaline solution can be an aqueous solution or an alcoholic solution, with an aqueous solution being preferred. The concentration of the alkaline solution is generally 5-40%. Additives that improve surface treatment effects and accelerate the surface treatment speed can be added to the alkaline solution, such as quaternary ammonium salts, alkyl sulfonates, sodium alkyl sulfate, polyethylene oxide, or polyethylene glycol. The temperature of the alkaline solution is generally 60-140℃. The treatment time generally ranges from 5 minutes to 6 hours, depending on the temperature and concentration of the alkaline solution used, especially the temperature. Higher temperatures result in shorter treatment times. Physical abrasion treatment refers to the contact friction between monofilaments and abrasive tools containing abrasive particles or abrasive tools with a rough surface. The monofilaments can be in a state not yet assembled onto the brush body or already assembled onto the brush body when contacting the abrasive tool, preferably already assembled onto the brush body. The abrasion method can be contact friction between a moving monofilament and a stationary abrasive tool, or vice versa. Physical polishing can occur before or during glass polishing with the brush (i.e., one part of the brush bristles is polishing the glass while another part is being processed by a polishing tool).

[0027] The manufacturing process for brushes made from PTT monofilaments can include bristle-embedded brushes, spring brushes, glue-cast brushes, hot-melt winding brushes, and machine-woven brushes. Bristle-embedded brushes are the preferred method.

[0028] The density of the bristles in the glass polishing brush according to the present invention is 10,000 bristles / cm². 2 Below. Bristle density refers to the number of bristles extending outwards per unit area on the outer surface of the brush. Bristle density is related to the diameter of the monofilament, the tightness of the monofilament arrangement, and the brush design. For larger diameter monofilaments, the bristle density will be reduced. For example, a 7mil monofilament, when the monofilaments are tightly arranged, will have a bristle density of 3600 bristles / cm². 2Approximately 8mil monofilaments, with a bristle density of 2800 bristles / cm when the monofilaments are tightly packed. 2 The density of the bristles will decrease if the monofilaments are not tightly packed. If the brush surface is not completely covered by bristles, but only partially covered, for example, if the bristles are spaced apart on the brush body, the bristle density will decrease further. For the PTT monofilaments of the glass polishing brush of the present invention with a diameter range of 4-30 mil, the bristle density of the glass polishing brush according to the present invention is preferably 10,000 bristles / cm. 2 the following.

[0029] The bristles of the glass polishing brush according to the present invention can be PTT monofilaments, or can comprise PTT monofilaments and one or more materials selected from other synthetic polymer monofilaments, animal hair, plant fibers, and materials commonly used in glass polishing processes. The other synthetic polymer monofilaments include nylon 610 monofilaments, nylon 612 monofilaments, nylon 66 monofilaments, nylon 6 monofilaments, PBT monofilaments, polyethylene terephthalate (PET) monofilaments, polypropylene monofilaments, etc.; the animal hairs include pig bristles, horsehair, etc.; the plant fibers include sisal, etc.; and the materials commonly used in glass polishing processes include strips of polyurethane abrasive. Especially when polishing fine structures is required, small strips of PTT monofilaments (e.g., 2-3 mm wide) can be embedded together on the brush. In one specific embodiment of the present invention, the amount of PTT monofilaments used as bristles is greater than or equal to 70% by weight, preferably greater than or equal to 80% by weight, more preferably greater than or equal to 90% by weight, particularly preferably greater than or equal to 99% by weight, calculated based on 100% by weight of all bristles.

[0030] There are no particular limitations on the shape of the brush body of the glass polishing brush according to the present invention. Different shapes of the brush body can form corresponding brush shapes, including but not limited to strip brushes, roller brushes, disc brushes, drum brushes, pipe brushes, brush rollers, brush wheels, dish brushes, bowl brushes, etc. Disc brushes, roller brushes, and pipe brushes are preferred. In one preferred embodiment, the brush body has a central axis of rotation. In another preferred embodiment, the brush body is a roller-shaped brush body or a disc-shaped brush body, with bristles extending radially outward from the circumferential surface of the roller-shaped brush body or extending vertically or obliquely outward from the disc surface of the disc-shaped brush body. In the context of the present invention, when the glass polishing brush is in the form of a roller brush, "brush body" and "brush roller" have the same meaning. There are no particular limitations on the material of the brush body of the glass polishing brush according to the present invention, including but not limited to plastics or metals. The plastics include high-density polyethylene, polypropylene, polyvinyl chloride, ABS engineering plastics, nylon 6, nylon 66, polyoxymethylene, polycarbonate, polycarbonate / polybutylene terephthalate blends, polycarbonate / ABS blends, polybutylene terephthalate, glass fiber reinforced materials and carbon fiber reinforced materials based on these polymers, etc. The metals include aluminum alloys, stainless steel, etc.

[0031] Glass polishing methods

[0032] Conventional glass polishing methods involve using a brush to polish the surface of a glass workpiece, wherein a dispersion of polishing particles is sprayed onto the surface of the brush bristles, and the brush carrying the dispersion of polishing particles rotates at a certain speed and comes into contact with the glass workpiece to achieve polishing.

[0033] In one specific embodiment of the method of the present invention, the specific polishing method includes, for example: Figure 1 As shown in (a)-(d), 12 bundles of bristles "1" are evenly spaced on the outer periphery of the brush roller "3". When the brush roller "3" rotates around its central axis, the nozzle "4" sprays polishing liquid containing polishing particles onto the bristles "1". The bristles "1", carrying the polishing liquid containing polishing particles, sweep across the edge of the glass sheet "2.1" in the glass stack "2". Because the length of the bristles "1" is greater than the distance from the outer surface of the brush roller "3" to the leading edge of the glass stack "2", the bristles "1" bend and deform when sweeping across the glass stack "2", and at the same time exert pressure on the edge of the glass sheet "2.1" in the glass stack "2". The polishing particles attached to the surface of the bristles polish the glass under pressure. There are spacers "2.2" between the glass sheets "2.1". One chamfer of the glass sheet "2.1" is swept by the moving bristles. The difference between the length of the bristles and the distance from the outer surface of the brush roller to the leading edge of the glass stack is the bristle indentation depth.

[0034] In one specific embodiment of the method of the present invention, when polishing a glass workpiece using a brush containing PTT monofilaments, it may be that only the brush rotates, only the glass workpiece rotates, both the brush and the glass workpiece rotate, or the brush or the glass workpiece may perform translational movements in other directions while rotating, such as relative movements that bring the brush closer to or away from the glass workpiece, or relative movements that bring the brush along the direction of the surface of the glass workpiece being processed.

[0035] In one specific embodiment of the method of the present invention, when polishing a glass workpiece with a brush containing PTT monofilaments, the polishing brush can be used on the outer edge of the glass workpiece, the inner and outer surfaces of the glass workpiece, or the edge of a hole in the glass workpiece.

[0036] In one specific embodiment of the method of the present invention, when polishing a glass workpiece using a brush containing PTT monofilaments, a dispersion of polishing particles needs to be sprayed onto the brush or the glass workpiece. The polishing particles include cerium oxide particles, alumina particles, silica particles, iron oxide particles, titanium dioxide particles, zirconium oxide particles, tin oxide particles, chromium oxide particles, manganese dioxide particles, zinc oxide particles, diamond particles, etc. The polishing process can use a single polishing particle, or two or more polishing particles, preferably cerium oxide particles. Cerium oxide particles may contain lanthanum and fluorine. These two elements can form a lanthanum fluoride oxyfluoride crystal structure within the cerium oxide particles. The lanthanum fluoride oxyfluoride crystal can increase the hardness of the polishing powder and improve its mechanical polishing performance. Fluorine and lanthanum atoms can also distort the cerium oxide lattice, increasing the reactivity of the chemical reaction between cerium and glass. Commercially available polishing powders are typically used, such as YJ-830E, YJ-710, and YJ-521 from Shanghai Yuancheng Optical Equipment Co., Ltd.

[0037] There are no particular restrictions on the type of glass polished with a brush. Glass is an amorphous inorganic non-metallic material, generally made from a variety of inorganic minerals as the main raw materials, with the addition of small amounts of auxiliary materials. Common types of glass include silicate glass, whose main components are silicon dioxide and other oxides. Examples include soda-lime glass, quartz glass, potassium glass, lead silicate glass, high-silica glass, borosilicate glass, aluminum-magnesium glass, and aluminosilicate glass. In addition, glass also includes boronate glass, whose main component is boron trioxide, and phosphate glass, whose main component is phosphorus pentoxide. Glass can be chemically strengthened through an ion exchange process to improve its scratch resistance and toughness. Commercially available glass examples include Corning Gorilla Glass.

[0038] Example

[0039] The present invention will be explained in more detail below with reference to the embodiments. The embodiments of the present invention are only used to illustrate the technical solutions of the present invention and are not intended to limit the scope of the present invention. Those skilled in the art can make some non-essential improvements and adjustments, which still fall within the protection scope of the present invention.

[0040] Test monofilament in the example

[0041]

[0042] Polishing powder in the examples

[0043]

[0044] Example 1

[0045] Polishing methods

[0046] A single-layer roller brush with 12 bristle bundles is made from 7mil PTT monofilament. The effective cross-sectional area of ​​each bristle bundle is approximately 16mm². 2 The effective cross-sectional area refers to the area occupied by the bristles on the cross-section of a bristle bundle, excluding the gaps between the bristles. Twelve bristle bundles are evenly distributed on the same horizontal plane along the circumference of the brush roller. The brush roller is made of polyoxymethylene and has a diameter of 120 mm. The exposed bristle length is 17.5 mm, therefore the brush diameter is 155 mm. The roller brush rotation speed is controlled at approximately 415 rpm.

[0047] The brush bristles contact the edge of a stack of five soda-lime glass slides, primarily contacting the three middle slides. The slides are Sailboat brand frosted-edge slides, model 7101. Each slide is approximately 1 mm thick, 25.4 mm wide, and 76.2 mm long, with a 1 mm thick spacer sandwiched between adjacent slides. The leading edge of the spacer is recessed 10 mm behind the polished leading edge of the glass slide. The brush bristles are pressed into the stack of glass slides to a depth of approximately 4.5 mm. During polishing, a polishing powder dispersion is continuously sprayed onto the rotating brush. The flow rate of the polishing powder dispersion is 617 ml / min. The polishing powder dispersion is prepared by dispersing 180 grams of YJ-830E polishing powder with an average particle size of 1.5 micrometers in 1200 ml of deionized water.

[0048] The polishing process lasted for 1 hour. After polishing, the glass slides were rinsed with deionized water to remove the polishing powder dispersion, and the remaining water was wiped off with a dry cloth. Then, the edges of the three glass slides in the middle of the stack of polished slides were observed under a microscope.

[0049] Repeat the steps of Example 1 for Examples 2-14 and Comparative Examples 1-6, except that the monofilaments, bristle bundle length, bristle insertion depth, polishing powder, and polishing powder particle concentration are adjusted according to Table 1 below. In Examples 12 and 13, a 0.6 mm thick spacer is sandwiched between two adjacent glass slides, while in the other examples and Comparative Examples 1-6, a 1 mm thick spacer is sandwiched between two adjacent glass slides.

[0050] Table 1

[0051]

[0052]

[0053] The polishing effect of the middle part and the polishing effect of the chamfered front edge of the polished glass obtained in Examples 1-14 and Comparative Examples 1-6 were scored according to the scoring criteria described in Tables 2 and 3 below.

[0054] Table 2

[0055]

[0056] Table 3

[0057]

[0058] As shown in Tables 2 and 3, polishing results with a rating of 1 are all poor and unacceptable, while a rating of 3 is the best, and a rating of 2 is in between. Polishing results with a rating of 2 or 3 are both acceptable.

[0059] The results of the polishing effects of the glass front chamfer and the glass middle section obtained in Examples 1-14 and Comparative Examples 1-6 are listed in Table 4 below.

[0060] Table 4

[0061]

[0062] As shown in Table 4, compared with Nylon 610 and 612 monofilaments, PTT monofilaments can polish glass more effectively, resulting in a smoother and more even surface. Compared with Nylon 610 and PBT monofilaments, PTT monofilaments do not create numerous deep grooves at the chamfered edges of the glass during polishing. The overall polishing effect of PTT monofilaments is superior to that of Nylon 610, Nylon 612, and PBT monofilaments.

[0063] When the diameter of a PTT monofilament is less than 4mil, such as 3mil, the polishing effect of the PTT monofilament deteriorates. It not only produces a large number of deep grooves at the chamfer of the glass, but also fails to obtain a flat and smooth surface.

[0064] Adjusting the polishing process parameters reveals that excellent polishing results can be obtained when the length of the PTT monofilament bristles is 8mm-26mm, the bristle insertion depth is 4.5mm-8mm, the polishing slurry concentration is 40g / L to 150g / L, and the average particle size of the polishing powder is 1.0 micrometer to 2.3 micrometer.

[0065] In addition, PTT monofilaments can also be PTT monofilaments that have undergone alkaline etching treatment.

[0066] It should be understood that the above description is only a preferred embodiment of the present invention. For those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also within the scope of protection claimed by the present invention.

Claims

1. A glass polishing brush, comprising a brush body and bristles distributed on the surface of the brush body, the bristles comprising poly(propylene terephthalate) (PTT) monofilaments, wherein the diameter of the PTT monofilaments is 4 mil to 30 mil.

2. The glass polishing brush of claim 1, wherein the bristles are composed of PTT monofilaments.

3. The glass polishing brush as described in claim 1, wherein the diameter of the PTT monofilament is 4-20 mil.

4. The glass polishing brush as described in claim 1, wherein the diameter of the PTT monofilament is 6 mil-20 mil.

5. The glass polishing brush as described in claim 1, wherein the diameter of the PTT monofilament is 7 mil-14 mil.

6. The glass polishing brush according to any one of claims 1-5, wherein, The bristle tuft length is 8-26mm.

7. The glass polishing brush according to any one of claims 1-5, wherein, The bristle tuft length is 12-20mm.

8. The glass polishing brush according to any one of claims 1-5, wherein, The bristle tuft length is 17.5 mm.

9. The glass polishing brush according to any one of claims 1-5, wherein, The cross-sectional shape of the PTT monofilament includes circular, elliptical, rectangular, rhomboid, triangular, hexagonal, or octagonal shapes.

10. The glass polishing brush as described in claim 9, wherein, The cross-sectional shape of the PTT monofilament includes circular or elliptical shapes.

11. The glass polishing brush according to any one of claims 1-5, wherein, The PTT monofilament is solid, or has a hollow channel running through it along its length, and the channel may be one or more.

12. The glass polishing brush according to any one of claims 1-5, wherein, The PTT monofilament contains 90-100% by weight of PTT and 0-10% by weight of other resins or additives.

13. The glass polishing brush as described in claim 12, wherein, The content of the other resins or additives shall not exceed 5% by weight.

14. The glass polishing brush as described in claim 12, wherein, The content of the other resins or additives shall not exceed 2% by weight.

15. The glass polishing brush as described in claim 12, wherein, The content of the other resins or additives is no more than 1 wt%.

16. The glass polishing brush as described in claim 12, wherein, The other resins are selected from one or more of polyethylene, ethylene copolymer, polypropylene, copolypropylene, polydimethylsiloxane, polymethylphenylsiloxane, polyalkylphenylsiloxane, polytetrafluoroethylene, polylactic acid, polyethylene glycol, polypropylene glycol, polymethyl acrylate, copolymers of polyacrylate, polystyrene, polystyrene copolymer, polyamide, copolyamide, polycarbonate, polyethylene terephthalate, polyethylene terephthalate-based copolyester, polybutylene terephthalate, polyethylene terephthalate-based copolyester, and polyethylene naphthalate, or the additives are selected from one or more of antioxidants, anti-hydrolysis agents, anti-UV additives, chain extenders, matting agents, nucleating agents, lubricants, plasticizers, toughening agents, pigments, and fillers.

17. The glass polishing brush according to any one of claims 1 and 3-5, wherein, The bristles comprise PTT monofilaments and one or more materials selected from other monofilaments, animal hair, plant fibers and other materials, wherein the content of the PTT monofilaments is greater than or equal to 70% by weight based on the total weight of the bristles.

18. The glass polishing brush of claim 17, wherein, The content of the PTT monofilament, based on the total weight of the bristles, is greater than or equal to 80% by weight.

19. The glass polishing brush as claimed in claim 17, wherein, The content of the PTT monofilament, based on the total weight of the bristles, is greater than or equal to 90% by weight.

20. The glass polishing brush of claim 17, wherein, The content of the PTT monofilament, based on the total weight of the bristles, is greater than or equal to 99% by weight.

21. The glass polishing brush according to any one of claims 1-5, wherein, The bristles undergo a surface treatment, which is selected from alkaline treatment and physical polishing.

22. The glass polishing brush as described in claim 21, wherein, The surface treatment is an alkaline solution treatment.

23. A method for polishing glass, comprising using a glass polishing brush as described in any one of claims 1-22.

24. The method for polishing glass as described in claim 23, comprising using the glass polishing brush in combination with a polishing liquid, the polishing liquid comprising one or more polishing particles selected from cerium oxide particles, aluminum oxide particles, silicon dioxide particles, iron oxide particles, titanium dioxide particles, zirconium oxide particles, tin oxide particles, chromium oxide particles, manganese dioxide particles, zinc oxide particles, and diamond particles.

25. The method for polishing glass as claimed in claim 24, wherein the glass polishing brush is used in combination with a polishing slurry containing cerium oxide particles, the concentration of the polishing slurry containing cerium oxide particles being from 40 g / L to 150 g / L, and the average particle size of the cerium oxide being from 1.0 micrometer to 2.3 micrometers.

26. The method for polishing glass as described in claim 22 or 24, wherein, The polished glass is selected from one or more of the following: soda-lime glass, quartz glass, potassium glass, lead silicate glass, high silicate glass, borosilicate glass, aluminum-magnesium glass, aluminosilicate glass, borate glass, and phosphate glass.

27. The method for polishing glass as described in claim 22 or 24, wherein, The areas of the glass to be polished are selected from the outer edge of the glass workpiece, the inner and outer surfaces of the glass workpiece, and the edges of holes in the glass workpiece.

28. Applications of PTT monofilament in glass polishing, among which, PTT monofilaments are used as bristles in glass polishing brushes, wherein the content of PTT monofilaments, based on the total weight of the bristles, is greater than or equal to 70% by weight, and the diameter of the PTT monofilaments is 4 mil to 30 mil.

29. The use as described in claim 28, wherein, The content of the PTT monofilament, based on the total weight of the bristles, is greater than or equal to 80% by weight.

30. The use as described in claim 28, wherein, The content of the PTT monofilament, based on the total weight of the bristles, is greater than or equal to 90% by weight.

31. The use as described in claim 28, wherein, The content of the PTT monofilament, based on the total weight of the bristles, is greater than or equal to 99% by weight.

32. The use as described in claim 28, wherein, The content of the PTT monofilament is 100% by weight, based on the total weight of the bristles.

33. The use as described in any one of claims 28-32, wherein, The diameter of the PTT monofilament is 4 mil-20 mil.

34. The use as described in claim 33, wherein, The diameter of the PTT monofilament is 6 mil-20 mil.

35. The use as described in claim 33, wherein, The diameter of the PTT monofilament is 7 mil-14 mil.

36. The use as described in any one of claims 28-32, wherein, The bristle tuft length is 8-26 mm.

37. The use as described in claim 36, wherein, The bristle tuft length is 12-20 mm.

38. The use as described in claim 36, wherein, The bristle tuft length is 17.5 mm.

39. The use as described in any one of claims 28-32, wherein, The cross-sectional shape of the PTT monofilament includes circular, elliptical, rectangular, rhomboid, triangular, hexagonal, or octagonal shapes.

40. The use as described in claim 39, wherein, The cross-sectional shape of the PTT monofilament includes circular or elliptical shapes.

41. The use as described in any one of claims 28-32, wherein, The PTT monofilament is solid, or has a hollow channel running through it along its length, and the channel may be one or more.

42. The use as described in any one of claims 28-32, wherein, The PTT monofilament contains 90-100% by weight of PTT and 0-10% by weight of other resins or additives.

43. The use as described in claim 42, wherein, The content of the other resins or additives shall not exceed 5% by weight.

44. The use as described in claim 42, wherein, The content of the other resins or additives shall not exceed 2% by weight.

45. The use as described in claim 42, wherein, The content of the other resins or additives is no more than 1 wt%.

Images