Bionic bristle type paint brush wire preparation process, brush application and brush wire raw material

Abstract

The preparation process of the bionic bristle type paint brush wire comprises the following steps: S1, stirring a mixture comprising PET, polyolefin, a flexibilizer and a compatilizer to obtain a bionic bristle type paint brush wire raw material; s2, the bionic bristle type paint brush wire raw materials are added into double-screw extrusion equipment to obtain brush wire particles, and the brush wire particles are dried; s3, adding the brush wire particles into single-screw extrusion equipment, performing melt extrusion and wire drawing, and performing heat setting on the drawn wire to obtain brush wires; and S4, the brush wires are cut and then sharpened, and the bionic bristle type paint brush wires are obtained. According to the brush wire disclosed by the invention, the polyolefin and the flexibilizer are added, so that on one hand, the compactness of the brush wire is improved, a good capillary action is formed, and the ink absorbency is improved; on the other hand, the flexibility of the brush wires can be improved, the uniformity of the brush wires in the painting process is ensured, and painting gaps are avoided.

Description

Technical Field

[0001] The invention belongs to the field of paint brush manufacturing, and in particular relates to a preparation process of bionic pig bristle paint brush filaments, brush tool applications and brush filament raw materials. Background Art

[0002] Paint brushes are widely used in the painting industry, primarily applying paint evenly to surfaces for purposes such as protection and decoration. Traditionally, pig bristles have long been widely used as brush filaments due to their unique physical properties, such as good ink absorption, elasticity, and ability to evenly disperse paint. They are highly trusted by users.

[0003] However, with the development of the industry, the use of pig bristles as paint brush filaments faces many challenges. Currently, the number of pig farms on the market is on a downward trend, and the pig breeding cycle is shortening. This has directly led to a significant drop in the supply of pig bristles, which in turn has caused the price of pig bristles to continue to rise, making it difficult to meet the market's growing demand for paint brushes. Against this background, with the continuous advancement of technology, alternative materials for brush filaments such as nylon, polyester, polyolefin and other synthetic fibers have gradually emerged. In the civilian field, polyester brush filaments, especially PET materials, are widely used. However, PET materials have obvious shortcomings in actual use. Their ink absorption and uniformity are far inferior to pig bristles. During the painting process, paint brushes using PET brush filaments often need to be frequently dipped in paint, or need to be brushed back and forth on the surface of the object multiple times to achieve an effect similar to that of pig bristle brush filaments. Summary of the Invention

[0004] The present invention aims to provide a preparation process for bionic pig bristle paint brush filaments, brush tool applications, and brush filament raw materials, using bionic pig bristles to solve the technical problems of poor ink absorption and uniformity of existing synthetic brush filaments.

[0005] To achieve the above objectives, the specific technical solutions for the preparation process, brush application, and brush filament raw materials of the present invention are as follows:

[0006] A process for preparing bionic pig bristle paint brush filaments comprises the following steps:

[0007] S1. Stirring a mixture of 60 to 80 parts by weight of PET, 10 to 20 parts of polyolefin, 5 to 10 parts of a toughening agent, and 5 to 10 parts of a compatibilizer to obtain a bionic pig bristle paint brush filament raw material;

[0008] S2, adding the bionic pig bristle paint brush filament raw material obtained in S1 into a twin-screw extruder for blending, extrusion and granulation to obtain brush filament particles and drying;

[0009] S3, adding the brush filament particles obtained in S2 into a single-screw extruder to melt-extrude and draw wires, and heat-setting the drawn wires to obtain brush filaments;

[0010] S4. Cut the brush filaments obtained in S3 as required, soak them in alkaline solution to simulate the natural split-end effect, and sharpen them to obtain bionic pig bristle paint brush filaments.

[0011] As a further improvement of the present invention, the polyolefin includes one or more of PP, HDPE, and LLDPE, the toughening agent is SEBS, and the compatibilizer is maleic anhydride grafted PP or a polyester compatibilizer.

[0012] As a further improvement of the present invention, in S1, stirring is carried out at a temperature of 20° C. to 25° C. at a stirring speed of 500 to 800 r / min for 30 minutes.

[0013] As a further improvement of the present invention, the temperature range of each screw zone of the twin-screw extruder in S2 is 240℃~260℃, the screw speed is 350~400r / min, the feeding speed is 20~25r / min, and the drying temperature for 2 hours is 150℃~180℃.

[0014] As a further improvement of the present invention, the temperatures of each zone of the screw are set as: 240°C in zone 1, 260°C in zone 2, 260°C in zone 3, 260°C in zone 4, 260°C in zone 5, 260°C in zone 6, 250°C in zone 7, 250°C in zone 8, 250°C in zone 9, 250°C in zone 10, and 260°C in the die head.

[0015] As a further improvement of the present invention, a hollow square wire die is used in S3 to obtain brush filaments with a diameter of 0.16mm to 0.18mm, and the temperature of the single-screw extruder is set to 280℃ to 290℃, followed by heat setting at 100℃ to 120℃ for 12 hours.

[0016] As a further improvement of the present invention, in S4, the cut brush filaments are immersed in a 40% by weight sodium hydroxide solution at 100° C. to 120° C. for 2 hours.

[0017] A bionic pig bristle paint brush is prepared by placing the bionic pig bristle paint brush filaments obtained in the above steps into a metal sheet and filling it with glue, curing the glue-filled brush filaments, and assembling the cured brush filaments with a brush handle to obtain a bionic pig bristle paint brush.

[0018] As a further improvement of the present invention, the curing process is to place the brush head after the glue filling in an oven at 50° C. to 80° C. for 2 hours.

[0019] A bionic pig bristle paint brush filament raw material is used for producing the bionic pig bristle paint brush filament.

[0020] Beneficial effects:

[0021] By precisely blending 60-80 parts PET, 10-20 parts polyolefin (one or more of PP, HDPE, and LLDPE), 5-10 parts toughening agent (SEBS), and 5-10 parts compatibilizer (maleic anhydride-grafted PP or a polyester compatibilizer), the resulting brush filaments achieve flexibility, hardness, and ink absorption similar to those of natural pig bristles. This material combination not only overcomes the limited ink absorption and uniformity of traditional PET brush filaments, but also improves their overall performance.

[0022] The process combines co-blending extrusion and granulation with single-screw melt extrusion to ensure consistent and stable quality of the brush filaments. In particular, the precise temperature and speed parameters of each zone of the twin-screw extruder, as well as the subsequent heat setting treatment, effectively enhance the mechanical properties and durability of the brush filaments.

[0023] By soaking the cut brush filaments in alkali, the split ends of natural pig bristles are simulated, further enhancing the brush's ink absorption and coating uniformity. This innovative method solves the key problem of synthetic fiber brush filaments being unable to achieve the same effects as natural pig bristles, significantly improving paint brush efficiency and coating quality.

[0024] The bionic pig-bristle paint brush prepared by the present invention has similar performance to traditional pig-bristle paint brushes, but at a lower cost and solves the problem of insufficient pig-bristle supply. This enables paint brushes to better meet market demand, has broad application prospects in both civilian and industrial fields, and is conducive to promoting the development of the paint brush industry. It provides a stable and efficient raw material solution for the production of paint brush filaments. This raw material is highly versatile and can be used on production lines of different sizes, which is conducive to large-scale production, improves overall production efficiency, and promotes the development and upgrading of related industries. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a morphology diagram of a bionic pig bristle paint brush filament of the present invention. DETAILED DESCRIPTION

[0026] In order to better understand the purpose, structure and function of the present invention, the following is a further detailed description of the preparation process of a bionic pig bristle paint brush filament, the application of the brush and the raw materials of the brush filament in conjunction with the accompanying drawings.

[0027] Example 1:

[0028] like Figure 1The preparation process of a bionic pig bristle paint brush filament shown in the figure, by modifying the brush filament composition, makes the polyester (synthetic fiber) brush achieve the painting effect of the pig bristle brush, and the customization and cost advantages are significantly improved.

[0029] Step 1: Put 60 parts of PET, 20 parts of polyolefin, 10 parts of toughening agent, and 10 parts of compatibilizer into a mixer and stir and mix, wherein the polyolefin is PP, the toughening agent is SEBS, and the compatibilizer is maleic anhydride grafted PP. Stir for 30 minutes at a stirring speed of 500r / min at room temperature of 25°C to obtain a bionic pig bristle paint brush filament raw material.

[0030] The addition of polyolefins (PP, HDPE, LLDPE, etc.) improves the overall performance of brush filaments. For example, PP's excellent chemical and water resistance, combined with HDPE's high strength and LLDPE's flexibility, work synergistically with PET to enhance the brush filament's chemical resistance, strength, and flexibility. The use of the toughening agent SEBS further enhances the filament's softness, making it less prone to voids during painting and reducing the number of paint dips required. Furthermore, the addition of maleic anhydride-grafted PP or polyester compatibilizers improves the compatibility of the various raw materials, ensuring the uniformity of the mixture and, consequently, the stability of the brush filament's performance.

[0031] Step 2: Add the bionic pig bristle paint brush filament raw material into the twin-screw extruder, and set the temperature of each zone of the extruder screw to: 240℃ for zone 1, 260℃ for zone 2, 260℃ for zone 3, 260℃ for zone 4, 260℃ for zone 5, 260℃ for zone 6, 250℃ for zone 7, 250℃ for zone 8, 250℃ for zone 9, 250℃ for zone 10, and 260℃ for the die head. The screw speed is 350r / min, the feeding speed is 20r / min, and the obtained brush filament particles are dried in an oven at 150℃ for 2 hours.

[0032] The precise temperature settings of each screw zone in the twin-screw extruder ensure thorough blending of the raw materials, ensuring uniform quality of the brush filament particles. Drying effectively removes moisture from the brush filament particles, preventing defects such as bubbles and voids in the brush filaments caused by moisture during subsequent processing, thereby improving the quality of the brush filament.

[0033] Step 3: Add the brush wire particles into a single-screw extruder for drawing to prepare brush wire. The brush wire has a diameter of 0.16 mm and a hollow square shape. The preparation process temperature is set to 280°C. The drawn wire is then heat-set at a setting temperature of 120°C for 12 hours.

[0034] A hollow square die is used to produce brush filaments of a specific diameter, which are then heat-set. This process gives the brush filaments a unique hollow structure, increasing their ink absorption. Heat-setting also ensures the shape stability of the brush filaments, making them less likely to deform during painting, allowing them to better absorb and evenly apply paint, improving the painting effect.

[0035] Step 4: Cut the brush filaments into two lengths (64 mm and 70 mm) for later assembly, and sharpen one end of the filaments of different lengths using a 40% by weight sodium hydroxide solution at 120°C for 2 hours to obtain bionic pig bristle paint brush filaments.

[0036] The cut brush filaments are soaked in sodium hydroxide solution and sharpened to simulate the split-end effect of natural pig bristles. The ends of the brush filaments after this treatment form a bifurcated structure similar to pig bristles, further improving the brush filaments' ability to absorb and disperse paint, making the paint application more uniform and approaching the paint application quality of a pig bristle paint brush.

[0037] Finally, the bionic pig bristle paint brush filaments are loaded into aluminum sheets and filled with glue. The glue-filled brush filaments are placed in an oven at 60°C for 2 hours for curing. The cured brush filaments are assembled with the brush handle to obtain a bionic pig bristle paint brush.

[0038] Example 2

[0039] With other conditions unchanged, in step 1, 70 parts of PET, 15 parts of polyolefin, 10 parts of toughening agent, and 5 parts of compatibilizer are used to prepare bionic pig bristle paint brush filament raw materials, and finally a bionic pig bristle paint brush is prepared.

[0040] Example 3

[0041] With other conditions remaining unchanged, in step 1, 80 parts of PET, 10 parts of polyolefin, 5 parts of toughening agent, and 5 parts of compatibilizer are used to prepare bionic pig bristle paint brush filament raw materials, and finally a bionic pig bristle paint brush is prepared.

[0042] Example 4

[0043] When other conditions remain unchanged, 80 parts of PET and 20 parts of PBT are used in step 1 to prepare bionic pig bristle paint brush filament raw materials, and finally a bionic pig bristle paint brush is prepared.

[0044] Example 5

[0045] When other conditions remain unchanged, 60 parts of PET and 40 parts of PBT are used in step 1 to prepare bionic pig bristle paint brush filament raw materials, and finally a bionic pig bristle paint brush is prepared.

[0046] The mechanical properties of the particles in Examples 1-5 were tested, and the results showed that when using Examples 4-5 of traditional PET / PBT blends, the impact performance of the prepared particles was poor, the modulus was high, and the material was relatively hard. When using Examples 1-3 modified with polyolefins and toughening agents, the impact performance of the material was significantly improved, the material became softer, and the soft brush filaments were conducive to the uniformity of paint application. In addition, the soft brush filaments were conducive to capillary action after being made into brush heads, which better improved the ink absorption of the paint brush. These effects were well demonstrated in the subsequent paint performance tests. The specific test results of the mechanical properties are shown in the following table:

[0047] performance tensile strength Elongation Bending strength flexural modulus Notched impact strength Example 1 38 60 68 1450 13.3 Example 2 46 38 76 1680 12.6 Example 3 47 24 80 1790 8.9 Example 4 50 36 86 1980 4.8 Example 5 48 42 82 1880 5.3

[0048] Table 1 Mechanical properties test results

[0049] Adhesion and paint-brushing performance tests of the prepared paint brushes show that the addition of polyolefin and toughening agent reduces the adhesion, but still meets the paint brush's performance requirements (>40N). If the adhesive strength of the brush filaments needs to be further enhanced in the future, this can be achieved by adjusting the adhesive formula or process. The paint-brushing length of the modified material brush filaments is significantly better than that of the conventional formula, and basically reaches the paint-brushing performance of pig bristles. The specific test results of adhesion and paint-brushing performance are shown in the following table:

[0050] performance Adhesive force / N Paint brush length / m Paint uniformity / visual inspection Example 1 42 2.2 Uniform Example 2 46 2.0 Uniform Example 3 48 1.9 Uniform Example 4 55 1.3 There is a blank in the back end Example 5 53 1.6 Slightly blank at the back bristle brush 69 2.3 Uniform

[0051] Table 2 Adhesion and paint performance test results

[0052] In summary, the bionic pig bristle paint brush of the present invention adopts synthetic fiber raw materials such as modified PET, which has a wide range of sources and is not limited by the supply of pig bristles, thus ensuring the stability and sustainability of production. By adding polyolefins and toughening agents for modification, the tightness of the brush filaments is improved, a good capillary effect is formed, the ink absorption is significantly improved, the paint uniformity is better, and the paint performance of the pig bristle brush is basically achieved; after being modified by polyolefins and toughening agents, the impact performance is significantly improved, the material becomes soft, the soft brush filaments are conducive to the uniformity of the paint, and after being made into a brush head, it is more conducive to capillary action and improves ink absorption. The addition of polyolefins and toughening agents reduces the adhesive force, but can meet the performance of the paint brush (>40N). If it is necessary to strengthen the adhesion of the brush filaments, it can be achieved by adjusting the adhesive formula or process, which is flexible. The paint brush of the present application achieves similar painting performance as a boar bristle brush while utilizing the low cost and strong customizability of synthetic fibers to reduce production costs. It can also prepare brush filaments of different lengths, shapes and diameters according to different occasions, thereby expanding the scope of application. Traditional boar bristle brushes and PET / PBT blend brushes are relatively limited in cost and customization.

[0053] It will be understood that the present invention is described by way of some embodiments, and it will be appreciated by those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are intended to be protected by the present invention.

Claims

1. A process for preparing bionic pig bristle paint brush filaments, characterized in that: The following steps are involved: S1. Stirring a mixture of 60 to 80 parts by weight of PET, 10 to 20 parts of polyolefin, 5 to 10 parts of a toughening agent, and 5 to 10 parts of a compatibilizer to obtain a bionic pig bristle paint brush filament raw material; S2, adding the bionic pig bristle paint brush filament raw material obtained in S1 into a twin-screw extruder for blending, extrusion and granulation to obtain brush filament particles and drying; S3, adding the brush filament particles obtained in S2 into a single-screw extruder to melt-extrude and draw wires, and heat-setting the drawn wires to obtain brush filaments; S4. Cut the brush filaments obtained in S3 as required, soak them in alkaline solution to simulate the natural split-end effect, and sharpen them to obtain bionic pig bristle paint brush filaments.

2. The process for preparing bionic pig bristle paint brush filaments according to claim 1, characterized in that: The polyolefin includes one or more of PP, HDPE, and LLDPE; the toughening agent is SEBS; and the compatibilizer is maleic anhydride grafted PP or a polyester compatibilizer.

3. The process for preparing bionic pig bristle paint brush filaments according to claim 1, characterized in that: In S1, stirring is performed at 20°C to 25°C at a stirring speed of 500 to 800 r / min for 30 minutes.

4. The process for preparing bionic pig bristle paint brush filaments according to claim 1, characterized in that: The temperature range of each screw zone of the twin-screw extruder in S2 is 240℃~260℃, the screw speed is 350~400r / min, the feeding speed is 20~25r / min, and the drying temperature for 2 hours is 150℃~180℃.

5. The process for preparing bionic pig bristle paint brush filaments according to claim 4, characterized in that: The temperature settings of each zone of the screw are: zone 1 240℃, zone 2 260℃, zone 3 260℃, zone 4 260℃, zone 5 260℃, zone 6 260℃, zone 7 250℃, zone 8 250℃, zone 9 250℃, zone 10 250℃, and die head 260℃.

6. The process for preparing bionic pig bristle paint brush filaments according to claim 1, characterized in that: In S3, a hollow square wire die is used to obtain brush filaments with a diameter of 0.16mm to 0.18mm. The temperature of the single-screw extruder is set at 280℃ to 290℃, and then heat-set at 100℃ to 120℃ for 12 hours.

7. The process for preparing bionic pig bristle paint brush filaments according to claim 1, characterized in that: In S4, the cut brush filaments are immersed in a 40% by weight sodium hydroxide solution at 100° C. to 120° C. for 2 hours.

8. A bionic pig bristle paint brush, characterized in that: The bionic pig bristle paint brush filaments according to any one of claims 1 to 7 are loaded into a metal sheet and filled with glue, the filled brush filaments are cured, and the cured brush filaments are assembled with a brush handle to obtain a bionic pig bristle paint brush.

9. The bionic pig bristle paint brush according to claim 8, characterized in that: The curing process is to place the brush head after the glue filling in an oven at 50℃~80℃ for 2 hours.

10. A bionic pig bristle paint brush filament raw material, characterized in that: Used for making the bionic pig bristle paint brush filaments described in any one of claims 1-7.

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