Antiskid rotational molding product and preparation method thereof

Abstract

The invention relates to the technical field of rotational molding, and discloses an anti-slip rotational molding product and a preparation method thereof.The anti-slip rotational molding product is prepared from A material powder, B material particles and C material particles, and the mold sticking temperature of the C material particles is larger than or equal to the mold sticking temperature of the A material powder and larger than the mold sticking temperature of the B material particles; the mold opening temperature is higher than the mold sticking temperature of the material B particles, and the difference between the mold opening temperature and the mold sticking temperature of the material B particles is larger than or equal to 15 DEG C; according to the method, the molded rotational molding product cannot generate the problems of material shortage and material leakage by adjusting the mold sticking temperature of the material A powder, the material B particles and the material C particles, a protruding structure with an anti-skid effect is formed on the surface of the rotational molding product after rotational molding by controlling the mold opening temperature, and the anti-skid rotational molding product formed at a time can be manufactured through the method.

Description

Technical Field

[0001] The invention relates to the technical field of rotational molding, and in particular to an anti-slip rotational molding product and a preparation method thereof. Background Art

[0002] Roto-molding is a process of processing plastic products using a rotating mold. The plastic substrate is placed into the mold, and then the mold is placed on a heating device for rotation or swinging. After the plastic substrate is heated, it flips and flows inside the mold. When the temperature reaches the softening point of the plastic substrate, it is gradually coated inside the mold. After coating is completed, the mold is demolded to take out the roto-molded product.

[0003] The prior art points out that products rotomolded using large-particle rotomolding materials have problems of lack of material, leakage of material and poor mechanical properties. Therefore, a large-particle rotomolding composite material and its preparation method and application disclosed in Publication No. CN113174101A are rotomolded using a combination of A material powder and B material particles. The product obtained by this technical solution eliminates the problems of lack of material and leakage of products rotomolded using large-particle rotomolding materials. The A material powder fills the pores between the large particles and significantly improves the mechanical properties of the rotomolded products. At present, large-particle rotomolding materials can be used to prepare a variety of different rotomolded products. For example, the large-particle rotomolding materials disclosed in Publication No. CN113308037B can be made into rotomolding products with different colors and large patterns. For example, the large-particle rotomolding materials disclosed in Publication No. CN115418043B can be made into rotomolding products with large meteor-shaped patterns. Therefore, it is of great significance to further explore the process materials for rotomolding large particles.

[0004] At present, when adding anti-slip function to traditional rotomolded products, the surface of the rotomolded products is usually further anti-slip treated. However, some rotomolded products have thin walls after molding, which makes it difficult to perform anti-slip treatment on their surfaces. Therefore, it is of great significance to provide a one-time anti-slip rotomolding process. Summary of the invention

[0005] In order to overcome the problem that rotationally molded products in the prior art are difficult to be anti-slip, the present invention provides an anti-slip rotationally molded product and a preparation method thereof, wherein the product is made by rotationally molding a rotationally molded material composed of A material powder, B material particles and C material particles, and the mold sticking temperature of the A material powder, B material particles and C material particles is adjusted so that the molded rotationally molded product will not have problems such as material shortage and leakage, and the demolding temperature is controlled so that a protruding structure with an anti-slip effect is formed on the surface of the rotationally molded product after rotationally molding. The method can produce an anti-slip rotationally molded product that is molded in one step.

[0006] The specific technical scheme of the present invention is: A non-slip rotational molding product, the raw materials include A material powder, B material particles and C material particles, the mold sticking temperature of the C material particles is ≥ the mold sticking temperature of the A material powder> the mold sticking temperature of the B material particles, the demoulding temperature is> the mold sticking temperature of the B material particles, and the difference between the demoulding temperature and the mold sticking temperature of the B material particles is ≥15°C.

[0007] The invention provides an anti-skid roto-molding product, which is made of a roto-molding material consisting of A material powder, B material particles and C material particles. The mold sticking temperature of the C material particles is ≥ the mold sticking temperature of the A material powder and is greater than the mold sticking temperature of the B material particles. During the roto-molding process, the B material particles with the lowest mold sticking temperature will first adhere to the mold to form an outer layer, and then the A material powder with high mold sticking temperature will fill the large holes, bubbles and edges and corners of the B material particle rolling product surface. Finally, the C material particles with high mold sticking temperature are attached to the surfaces of the B material particles and the A material powder to form a basic model of the roto-molded product. Then, the demoulding temperature is controlled to make the demoulding temperature greater than the mold sticking temperature of the B material particles. Since the B material particles are not completely solidified when the mold is opened, the B material particles in the outer layer will produce a protruding structure during the demoulding process, so that the formed roto-molded model has an anti-skid effect.

[0008] In addition, the present application discovered that the demolding temperature has an important relationship with the height of the protrusions on the surface of the rotomolded product, that is, the greater the difference between the demolding temperature and the sticking temperature of the B material particles, the greater the height of the protrusions on the surface of the rotomolded product. After analysis, it was found that when the difference between the demolding temperature and the sticking temperature of the B material particles is above 15°C, an excellent anti-slip effect can be produced.

[0009] Preferably, the raw materials of the A material powder and the C material particles include a base resin and a release agent, and the raw materials of the B material particles include a base resin and an adhesive.

[0010] Preferably, the release agent is one or more of silicon dioxide, oleamide, erucamide, stearic acid amide, stearic acid trimethyl ammonium chloride, stearic acid dimethyl amyl ammonium chloride, alkyl tertiary amine nitrate, trihydroxyethyl methyl quaternary ammonium methyl sulfate, N, N-hexadecyl ethyl morpholine ethyl sulfate, alkyl sodium sulfonate, alkyl phosphate, polyacrylate, polystyrene sulfonate, ethoxylated alkylamine, ethoxy lauric acid amine, dilauryl phosphate, glycerol monostearate, ethoxy lauric acid amine, amphoteric alkyl imidazoline salts and alkyl amino acids; the base resin is one or more of polyethylene, polypropylene, polyoxymethylene, polyolefin elastomer, nylon, polylactic acid and polycarbonate materials.

[0011] Preferably, the adhesive is one or more of polyethylene wax, polypropylene wax, paraffin wax, microcrystalline wax, Fischer-Tropsch wax, EVA wax, oxidized polyethylene wax, POE, EVA, EAA, polyethylene grafts, polypropylene grafts and POE grafts.

[0012] Preferably, the powder flowability of the A material powder is ≤35s / 100g, and the particle size distribution D95 is ≤550μm; the particle shape of the B material is spherical, ellipsoidal, cylindrical, and elliptical cylindrical, wherein the diameter of the sphere and ellipsoid is 0.1-3mm, the size of the cylindrical and elliptical cylindrical is 0.1-3mm in diameter and 0.1-3mm in length, and the melt index is ≤6g / min; the particle shape of the C material is spherical, ellipsoidal, cylindrical, and elliptical cylindrical, wherein the diameter of the sphere and ellipsoid is 0.1-3mm, the size of the cylindrical and elliptical cylindrical is 0.1-3mm in diameter and 0.1-3mm in length.

[0013] Preferably, the surface of the anti-slip rotationally molded product is provided with a plurality of protrusions, and the length of the protrusions is 0.1 to 5 mm.

[0014] Preferably, the raw materials include, by apparent volume percentage: 2 to 20 parts of material A powder, 5 to 65 parts of material B particles, and 15 to 93 parts of material C particles.

[0015] A method for preparing the above-mentioned anti-slip rotationally molded product comprises the following steps: mixing material A powder, material B particles and material C particles uniformly, injecting the mixture into a rotationally molded mold, and performing rotational molding to prepare an anti-slip rotationally molded finished product.

[0016] Preferably, the mixing conditions include: mixing speed of 10 to 120 rpm, and mixing time of 2 to 20 min.

[0017] Preferably, the rotational molding mold is a non-Teflon coated mold.

[0018] Compared with the prior art, this application has the following technical effects: The invention provides an anti-skid roto-molded product and a preparation method thereof. The product is roto-molded by roto-molding a roto-molded material composed of A material powder, B material particles and C material particles. The mold sticking temperature of the A material powder, B material particles and C material particles is adjusted so that the molded roto-molded product will not have the problem of material shortage or leakage, and the demoulding temperature is controlled so that a convex structure with an anti-skid effect is formed on the surface of the roto-molded product after roto-molding. The method can produce an anti-skid roto-molded product that is molded in one step. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the embodiments.

[0020] Embodiment 1: A non-slip rotational molding product, the raw materials are composed of A material powder, B material particles and C material particles; Material A powder is a white powder with a particle size of D95≤485μm and a powder flowability of 26s / 100g; The B material particles are cylindrical black particles with a melt flow rate of ≤6 g / min, a diameter of 2.7 mm and a length of 3.0 mm; the C material particles are cylindrical white particles with a diameter of 2.7 mm and a length of 3.0 mm.

[0021] A method for preparing the above-mentioned anti-slip rotationally molded product comprises the following steps: Step 1: Grind polyethylene (50035E, Saudi Arabian Basic) particles with a plastic grinder to obtain material A powder. The grinding conditions are: Grinding disc temperature ≤75℃, grinding disc speed 2800rpm; Step 2: 25 parts by weight of polyethylene (50035E, Saudi Arabian base) and 75 parts of POE (3024, ExxonMobil) were injected into a high-speed mixer and mixed for 8 minutes. The temperature of each section of the extruder was set to 80-220°C, the screw speed was 300 rpm, and the twin-screw extruder was used for melt blending and granulation, and dried to obtain B material particles; Step 3: 99.5 parts by weight of polyethylene (50035E, Saudi Arabian basis) and 0.5 parts of erucamide (commercially available) are injected into a high-speed mixer and mixed for 5 minutes. The temperature of each section of the extruder is set to 140-240° C., the screw speed is 330 rpm, and the twin-screw extruder is used for melt blending and granulation, and dried to obtain C material particles; Step 4: According to the apparent volume, 0.52L of white powder of material A, 0.88L of black particles of material B and 2.1L of white particles of material C were injected into a medium-speed mixer and mixed for 8 minutes to make a rotational molding material. The speed of the mixer was 80rpm. The rotational molding material was injected into a square box rotational molding mold and heated for rotational molding. The main shaft speed was 10rpm, the secondary shaft speed was 12.5rpm, and the demolding was performed at a demolding temperature of 100°C to obtain an anti-slip rotational molding product.

[0022] Embodiment 2: A non-slip rotational molding product, the raw materials are composed of A material powder, B material particles and C material particles. Material A powder is a white powder with a particle size of D95≤485μm and a powder flowability of 26s / 100g; The B material particles are cylindrical black particles with a melt flow rate of ≤6 g / min, a diameter of 2.7 mm and a length of 3.0 mm; the C material particles are cylindrical white particles with a diameter of 2.7 mm and a length of 3.0 mm.

[0023] A method for preparing the above-mentioned anti-slip rotationally molded product comprises the following steps: Step 1: Grind polyethylene (50035E, Saudi Arabian Basic) particles with a plastic grinder to obtain material A powder. The grinding conditions are: Grinding disc temperature ≤75℃, grinding disc speed 2800rpm; Step 2: 25 parts by weight of polyethylene (50035E, Saudi Arabian base) and 75 parts of POE (3024, ExxonMobil) were injected into a high-speed mixer and mixed for 8 minutes. The temperature of each section of the extruder was set to 80-220°C, the screw speed was 300 rpm, and the twin-screw extruder was used for melt blending and granulation, and dried to obtain B material particles; Step 3: 99.5 parts by weight of polyethylene (50035E, Saudi Arabian basis) and 0.5 parts of erucamide (commercially available) are injected into a high-speed mixer and mixed for 5 minutes. The temperature of each section of the extruder is set to 140-240° C., the screw speed is 330 rpm, and the twin-screw extruder is used for melt blending and granulation, and dried to obtain C material particles; Step 4: According to the apparent volume, 0.52L of white powder of material A, 0.88L of black particles of material B and 2.1L of white particles of material C were injected into a medium-speed mixer and mixed for 8 minutes to make a rotational molding material. The speed of the mixer was 80rpm. The rotational molding material was injected into a square box rotational molding mold and heated for rotational molding. The main shaft speed was 10rpm and the secondary shaft speed was 12.5rpm. The mold was demolded at a demolding temperature of 90°C to obtain an anti-slip rotational molding product.

[0024] Embodiment 3: A non-slip rotational molding product, the raw materials are composed of A material powder, B material particles and C material particles. Material A powder is a white powder with a particle size of D95≤485μm and a powder flowability of 26s / 100g; The B material particles are cylindrical black particles with a melt flow rate of ≤6 g / min, a diameter of 2.7 mm and a length of 3.0 mm; the C material particles are cylindrical white particles with a diameter of 2.7 mm and a length of 3.0 mm.

[0025] A method for preparing the above-mentioned anti-slip rotationally molded product comprises the following steps: Step 1: Grind polyethylene (50035E, Saudi Arabian Basic) particles with a plastic grinder to obtain material A powder. The grinding conditions are: Grinding disc temperature ≤75℃, grinding disc speed 2800rpm; Step 2: 25 parts by weight of polyethylene (50035E, Saudi Arabian base) and 75 parts of POE (3024, ExxonMobil) were injected into a high-speed mixer and mixed for 8 minutes. The temperature of each section of the extruder was set to 80-220°C, the screw speed was 300 rpm, and the twin-screw extruder was used for melt blending and granulation, and dried to obtain B material particles; Step 3: 99.5 parts by weight of polyethylene (50035E, Saudi Arabian basis) and 0.5 parts of erucamide (commercially available) are injected into a high-speed mixer and mixed for 5 minutes. The temperature of each section of the extruder is set to 140-240° C., the screw speed is 330 rpm, and the twin-screw extruder is used for melt blending and granulation, and dried to obtain C material particles; Step 4: According to the apparent volume, 0.52L of white powder of material A, 0.88L of black particles of material B and 2.1L of white particles of material C were injected into a medium-speed mixer and mixed for 8 minutes to make a rotational molding material. The speed of the mixer was 80rpm. The rotational molding material was injected into a square box rotational molding mold and heated for rotational molding. The main shaft speed was 10rpm, the secondary shaft speed was 12.5rpm, and the demolding was performed at a demolding temperature of 80°C to obtain an anti-slip rotational molding product.

[0026] Embodiment 4: A non-slip rotational molding product, the raw materials are composed of A material powder, B material particles and C material particles. Material A powder is a white powder with a particle size of D95≤500μm and a powder flowability of 28s / 100g; The B material particles are black B material particles with a melt flow rate of ≤6g / min and a diameter of 0.8mm and in the shape of an ellipsoid; The C material particles are white ellipsoidal particles with a diameter of 0.8 mm.

[0027] A method for preparing the above-mentioned anti-slip rotationally molded product comprises the following steps: Step 1: Grind polyethylene (6329U, Thailand matrix) particles with a plastic grinder to obtain material A powder. The grinding conditions are: grinding disc temperature ≤ 75°C, grinding disc speed 2500rpm; Step 2: 65 parts by weight of polyethylene (LL8446.21, ExxonMobil) and 35 parts of EVA (7470K, Formosa Plastics) were injected into a high-speed mixer and mixed for 10 minutes. The temperature of each section of the extruder was set to 70-210° C., the screw speed was 350 rpm, and the twin-screw extruder was used for melt blending and granulation, and dried to obtain B material particles; Step 3: 97.5 parts by mass of polyethylene (7042, Zhenhai Refining and Chemical) and 2.5 parts of stearic acid dimethylpentyl ammonium chloride (commercially available) are injected into a high-speed mixer and mixed for 5 minutes. The temperature of each section of the extruder is set to 140-240° C., the screw speed is 330 rpm, and the twin-screw extruder is used for melt blending and granulation, and dried to obtain C material particles; Step 4: According to the apparent volume, 0.42L of white powder of material A, 1.05L of black particles of material B and 2.03L of white particles of material C were injected into a medium-speed mixer and mixed for 8 minutes to make a rotational molding material. The speed of the mixer was 80rpm. The rotational molding material was injected into a square box rotational molding mold and heated for rotational molding. The main shaft speed was 10rpm, the secondary shaft speed was 12.5rpm, and the demolding was performed at a demolding temperature of 90°C to obtain a non-slip rotational molding product.

[0028] Embodiment 5: A non-slip rotational molding product, the raw materials are composed of A material powder, B material particles and C material particles. Material A powder is a white powder with a particle size of D95≤500μm and a powder flowability of 28s / 100g; The B material particles are black B material particles with a melt flow rate of ≤6g / min and a diameter of 0.8mm and in the shape of an ellipsoid; The C material particles are white ellipsoidal particles with a diameter of 0.8 mm.

[0029] A method for preparing the above-mentioned anti-slip rotationally molded product comprises the following steps: Step 1: Grind polyethylene (6329U, Thailand matrix) particles with a plastic grinder to obtain material A powder. The grinding conditions are: grinding disc temperature ≤ 75°C, grinding disc speed 2500rpm; Step 2: 65 parts by weight of polyethylene (LL8446.21, ExxonMobil) and 35 parts of EVA (7470K, Formosa Plastics) were injected into a high-speed mixer and mixed for 10 minutes. The temperature of each section of the extruder was set to 70-210° C., the screw speed was 350 rpm, and the twin-screw extruder was used for melt blending and granulation, and dried to obtain B material particles; Step 3: 97.5 parts by mass of polyethylene (7042, Zhenhai Refining and Chemical) and 2.5 parts of stearic acid dimethylpentyl ammonium chloride (commercially available) are injected into a high-speed mixer and mixed for 5 minutes. The temperature of each section of the extruder is set to 140-240° C., the screw speed is 330 rpm, and the twin-screw extruder is used for melt blending and granulation, and dried to obtain C material particles; Step 4: According to the apparent volume, 0.42L of white powder of material A, 1.05L of black particles of material B and 2.03L of white particles of material C were injected into a medium-speed mixer and mixed for 8 minutes to make a rotational molding material. The speed of the mixer was 80rpm. The rotational molding material was injected into a square box rotational molding mold and heated for rotational molding. The main shaft speed was 10rpm, the secondary shaft speed was 12.5rpm, and the demolding was performed at a demolding temperature of 100°C to obtain an anti-slip rotational molding product.

[0030] Embodiment 6: A non-slip rotational molding product, the raw materials are composed of A material powder, B material particles and C material particles. Material A powder is a white powder with a particle size of D95≤500μm and a powder flowability of 28s / 100g; The B material particles are black B material particles with a melt flow rate of ≤6g / min and a diameter of 0.8mm and in the shape of an ellipsoid; The C material particles are white ellipsoidal particles with a diameter of 0.8 mm.

[0031] A method for preparing the above-mentioned anti-slip rotationally molded product comprises the following steps: Step 1: Grind polyethylene (6329U, Thailand matrix) particles with a plastic grinder to obtain material A powder. The grinding conditions are: grinding disc temperature ≤ 75°C, grinding disc speed 2500rpm; Step 2: 65 parts by weight of polyethylene (LL8446.21, ExxonMobil) and 35 parts of EVA (7470K, Formosa Plastics) were injected into a high-speed mixer and mixed for 10 minutes. The temperature of each section of the extruder was set to 70-210° C., the screw speed was 350 rpm, and the twin-screw extruder was used for melt blending and granulation, and dried to obtain B material particles; Step 3: 97.5 parts by mass of polyethylene (7042, Zhenhai Refining and Chemical) and 2.5 parts of stearic acid dimethylpentyl ammonium chloride (commercially available) are injected into a high-speed mixer and mixed for 5 minutes. The temperature of each section of the extruder is set to 140-240° C., the screw speed is 330 rpm, and the twin-screw extruder is used for melt blending and granulation, and dried to obtain C material particles; Step 4: According to the apparent volume, 0.42L of white powder of material A, 1.05L of black particles of material B and 2.03L of white particles of material C were injected into a medium-speed mixer and mixed for 8 minutes to make a rotational molding material. The speed of the mixer was 80rpm. The rotational molding material was injected into a square box rotational molding mold and heated for rotational molding. The main shaft speed was 10rpm, the secondary shaft speed was 12.5rpm, and the demolding was performed at a demolding temperature of 110°C to obtain a non-slip rotational molding product.

[0032] Comparative Example 1: Compared with Examples 1 to 3, the difference between the demoulding temperature of Comparative Example 1 and the sticking temperature of the B material particles is less than 15°C, and the demoulding temperature of Comparative Example 1 is 75°C; A non-slip rotational molding product, the raw materials are composed of A material powder, B material particles and C material particles. Material A powder is a white powder with a particle size of D95≤485μm and a powder flowability of 26s / 100g; The B material particles are cylindrical black particles with a melt flow rate of ≤6 g / min, a diameter of 2.7 mm and a length of 3.0 mm; the C material particles are cylindrical white particles with a diameter of 2.7 mm and a length of 3.0 mm.

[0033] A method for preparing the above-mentioned anti-slip rotationally molded product comprises the following steps: Step 1: Grind polyethylene (50035E, Saudi Arabian Basic) particles with a plastic grinder to obtain material A powder. The grinding conditions are: Grinding disc temperature ≤75℃, grinding disc speed 2800rpm; Step 2: 25 parts by weight of polyethylene (50035E, Saudi Arabian base) and 75 parts of POE (3024, ExxonMobil) were injected into a high-speed mixer and mixed for 8 minutes. The temperature of each section of the extruder was set to 80-220°C, the screw speed was 300 rpm, and the twin-screw extruder was used for melt blending and granulation, and dried to obtain B material particles; Step 3: 99.5 parts by weight of polyethylene (50035E, Saudi Arabian basis) and 0.5 parts of erucamide (commercially available) are injected into a high-speed mixer and mixed for 5 minutes. The temperature of each section of the extruder is set to 140-240° C., the screw speed is 330 rpm, and the twin-screw extruder is used for melt blending and granulation, and dried to obtain C material particles; Step 4: According to the apparent volume, 0.52L of white powder of material A, 0.88L of black particles of material B and 2.1L of white particles of material C were injected into a medium-speed mixer and mixed for 8 minutes to make a rotational molding material. The speed of the mixer was 80rpm. The rotational molding material was injected into a square box rotational molding mold and heated for rotational molding. The main shaft speed was 10rpm, the secondary shaft speed was 12.5rpm, and the demolding was performed at a demolding temperature of 75°C to obtain a non-slip rotational molding product.

[0034] Comparative Example 2: Compared with Examples 1 to 3, the demoulding temperature of Comparative Example 2 is lower than the sticking temperature of the B material particles, and the demoulding temperature of Comparative Example 2 is 55°C; A non-slip rotational molding product, the raw materials are composed of A material powder, B material particles and C material particles. Material A powder is a white powder with a particle size of D95≤485μm and a powder flowability of 26s / 100g; The B material particles are cylindrical black particles with a melt flow rate of ≤6 g / min, a diameter of 2.7 mm and a length of 3.0 mm; the C material particles are cylindrical white particles with a diameter of 2.7 mm and a length of 3.0 mm.

[0035] A method for preparing the above-mentioned anti-slip rotationally molded product comprises the following steps: Step 1: Grind polyethylene (50035E, Saudi Arabian Basic) particles with a plastic grinder to obtain material A powder. The grinding conditions are: Grinding disc temperature ≤75℃, grinding disc speed 2800rpm; Step 2: 25 parts by weight of polyethylene (50035E, Saudi Arabian base) and 75 parts of POE (3024, ExxonMobil) were injected into a high-speed mixer and mixed for 8 minutes. The temperature of each section of the extruder was set to 80-220°C, the screw speed was 300 rpm, and the twin-screw extruder was used for melt blending and granulation, and dried to obtain B material particles; Step 3: 99.5 parts by weight of polyethylene (50035E, Saudi Arabian basis) and 0.5 parts of erucamide (commercially available) are injected into a high-speed mixer and mixed for 5 minutes. The temperature of each section of the extruder is set to 140-240° C., the screw speed is 330 rpm, and the twin-screw extruder is used for melt blending and granulation, and dried to obtain C material particles; Step 4: According to the apparent volume, 0.52L of white powder of material A, 0.88L of black particles of material B and 2.1L of white particles of material C were injected into a medium-speed mixer and mixed for 8 minutes to make a rotational molding material. The speed of the mixer was 80rpm. The rotational molding material was injected into a square box rotational molding mold and heated for rotational molding. The main shaft speed was 10rpm and the secondary shaft speed was 12.5rpm. The mold was demolded at a demolding temperature of ℃ to obtain an anti-slip rotational molding product.

[0036] Comparative Example 3: Compared with Examples 4 to 6, the difference between the demoulding temperature of Comparative Example 3 and the sticking temperature of the B material particles is less than 15°C, and the demoulding temperature of Comparative Example 3 is 85°C; A non-slip rotational molding product, the raw materials are composed of A material powder, B material particles and C material particles. Material A powder is a white powder with a particle size of D95≤500μm and a powder flowability of 28s / 100g; The B material particles are black B material particles with a melt flow rate of ≤6g / min and a diameter of 0.8mm and in the shape of an ellipsoid; The C material particles are white ellipsoidal particles with a diameter of 0.8 mm.

[0037] A method for preparing the above-mentioned anti-slip rotationally molded product comprises the following steps: Step 1: Grind polyethylene (6329U, Thailand matrix) particles with a plastic grinder to obtain material A powder. The grinding conditions are: grinding disc temperature ≤ 75°C, grinding disc speed 2500rpm; Step 2: 65 parts by weight of polyethylene (LL8446.21, ExxonMobil) and 35 parts of EVA (7470K, Formosa Plastics) were injected into a high-speed mixer and mixed for 10 minutes. The temperature of each section of the extruder was set to 70-210° C., the screw speed was 350 rpm, and the twin-screw extruder was used for melt blending and granulation, and dried to obtain B material particles; Step 3: 97.5 parts by mass of polyethylene (7042, Zhenhai Refining and Chemical) and 2.5 parts of stearic acid dimethylpentyl ammonium chloride (commercially available) are injected into a high-speed mixer and mixed for 5 minutes. The temperature of each section of the extruder is set to 140-240° C., the screw speed is 330 rpm, and the twin-screw extruder is used for melt blending and granulation, and dried to obtain C material particles; Step 4: According to the apparent volume, 0.42L of white powder of material A, 1.05L of black particles of material B and 2.03L of white particles of material C were injected into a medium-speed mixer and mixed for 8 minutes to make a rotational molding material. The speed of the mixer was 80rpm. The rotational molding material was injected into a square box rotational molding mold and heated for rotational molding. The main shaft speed was 10rpm and the secondary shaft speed was 12.5rpm. The mold was demolded at a demolding temperature of ℃ to obtain an anti-slip rotational molding product.

[0038] Comparative Example 4: Compared with Examples 4 to 6, the demoulding temperature of Comparative Example 4 is lower than the sticking temperature of the B material particles, and the demoulding temperature of Comparative Example 4 is 75°C; A non-slip rotational molding product, the raw materials are composed of A material powder, B material particles and C material particles. Material A powder is a white powder with a particle size of D95≤500μm and a powder flowability of 28s / 100g; The B material particles are black B material particles with a melt flow rate of ≤6g / min and a diameter of 0.8mm and in the shape of an ellipsoid; The C material particles are white ellipsoidal particles with a diameter of 0.8 mm.

[0039] A method for preparing the above-mentioned anti-slip rotationally molded product comprises the following steps: Step 1: Grind polyethylene (6329U, Thailand matrix) particles with a plastic grinder to obtain material A powder. The grinding conditions are: grinding disc temperature ≤ 75°C, grinding disc speed 2500rpm; Step 2: 65 parts by weight of polyethylene (LL8446.21, ExxonMobil) and 35 parts of EVA (7470K, Formosa Plastics) were injected into a high-speed mixer and mixed for 10 minutes. The temperature of each section of the extruder was set to 70-210° C., the screw speed was 350 rpm, and the twin-screw extruder was used for melt blending and granulation, and dried to obtain B material particles; Step 3: 97.5 parts by mass of polyethylene (7042, Zhenhai Refining and Chemical) and 2.5 parts of stearic acid dimethylpentyl ammonium chloride (commercially available) are injected into a high-speed mixer and mixed for 5 minutes. The temperature of each section of the extruder is set to 140-240° C., the screw speed is 330 rpm, and the twin-screw extruder is used for melt blending and granulation, and dried to obtain C material particles; Step 4: According to the apparent volume, 0.42L of white powder of material A, 1.05L of black particles of material B and 2.03L of white particles of material C were injected into a medium-speed mixer and mixed for 8 minutes to make a rotational molding material. The speed of the mixer was 80rpm. The rotational molding material was injected into a square box rotational molding mold and heated for rotational molding. The main shaft speed was 10rpm, the secondary shaft speed was 12.5rpm, and the demolding was performed at a demolding temperature of 70°C to obtain a non-slip rotational molding product.

[0040] Comparative Example 5: Compared with Example 1, no A material powder was used in Comparative Example 5, and the other conditions were the same as those in Example 1.

[0041] Test example: The performance of the anti-slip rotomolded products prepared in Examples 1 to 6 and Comparative Examples 1 to 5 was tested; The static friction coefficient was tested using the friction coefficient tester MXD-02; The protrusion height is measured using a scale; The test results are shown in Table 1; Table 1 Performance of anti-slip rotomolding products As shown in Table 1, the surfaces of the anti-slip roto-molded products obtained in Examples 1 to 6 have no missing large holes and missing bubbles, and a number of brushed protrusions are formed on the surfaces of the anti-slip roto-molded products, with a height of 0.1 to 5 mm. The above results indicate that the method of the present invention can directly produce roto-molded products with anti-slip function through roto-molding.

[0042] In Comparative Examples 1 and 3, the difference between the demoulding temperature and the sticking temperature of the B material particles was less than 15° C. It was found that the height of the protrusions produced was less than 0.1 mm, so that the rotationally molded products could not produce effective anti-slip properties.

[0043] In Comparative Examples 2 and 4, the demoulding temperature is lower than the sticking temperature of the B material particles. It is found that the B material particles have solidified before the mold is opened, and no protruding structure with anti-slip effect can be generated on the surface of the rotationally molded product.

[0044] In Comparative Example 5, the powder of material A was not used. As a result, it was found that the surface of the rotationally molded product had problems of large holes and bubbles due to lack of material, and the quality of the rotationally molded product was poor.

[0045] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A non-slip rotationally molded product, characterized in that: The raw materials include A material powder, B material particles and C material particles. The sticking temperature of C material particles is ≥ the sticking temperature of A material powder> the sticking temperature of B material particles, the opening mold temperature is> the sticking temperature of B material particles, and the difference between the opening mold temperature and the sticking temperature of B material particles is ≥15°C.

2. The anti-slip rotationally molded product according to claim 1, characterized in that: The raw materials of the A material powder and the C material particles include a base resin and a release agent, and the raw materials of the B material particles include a base resin and an adhesive.

3. The anti-slip rotationally molded product according to claim 2, characterized in that: The release agent is one or more of silicon dioxide, oleamide, erucamide, stearic acid amide, stearic acid trimethyl ammonium chloride, stearic acid dimethyl amyl ammonium chloride, alkyl tertiary amine nitrate, trihydroxyethyl methyl quaternary ammonium methyl sulfate, N, N-hexadecyl ethyl morpholine ethyl sulfate, alkyl sodium sulfonate, alkyl phosphate, polyacrylate, polystyrene sulfonate, ethoxylated alkylamine, ethoxy lauric acid amine, dilauryl phosphate, glycerol monostearate, ethoxy lauric acid amine, amphoteric alkyl imidazoline salt and alkyl amino acid; the base resin is one or more of polyethylene, polypropylene, polyoxymethylene, polyolefin elastomer, nylon, polylactic acid and polycarbonate materials.

4. The anti-slip rotationally molded product according to claim 2, characterized in that: The adhesive may be one or more of polyethylene wax, polypropylene wax, paraffin wax, microcrystalline wax, Fischer-Tropsch wax, EVA wax, oxidized polyethylene wax, POE, EVA, EAA, polyethylene grafts, polypropylene grafts and POE grafts.

5. The anti-slip rotationally molded product according to claim 1 or 2, characterized in that: The powder flowability of the A material powder is ≤35s / 100g, and the particle size distribution D95 is ≤550μm; the particle shape of the B material is spherical, ellipsoidal, cylindrical, and elliptical cylindrical, wherein the diameter of the sphere and ellipsoid is 0.1~3mm, the size of the cylindrical and elliptical cylindrical is 0.1~3mm in diameter and 0.1~3mm in length, and the melt index is ≤6g / min; the particle shape of the C material is spherical, ellipsoidal, cylindrical, and elliptical cylindrical, wherein the diameter of the sphere and ellipsoid is 0.1~3mm, the size of the cylindrical and elliptical cylindrical is 0.1~3mm in diameter and 0.1~3mm in length.

6. The anti-slip rotationally molded product according to claim 1, characterized in that: The surface of the anti-slip rotationally molded product is provided with a plurality of protrusions, and the length of the protrusions is 0.1-5 mm.

7. The anti-slip rotationally molded product according to claim 1, characterized in that: The raw materials include, by apparent volume percentage: 2 to 20 parts of material A powder, 5 to 65 parts of material B particles, and 15 to 93 parts of material C particles.

8. A method for preparing the anti-slip rotationally molded product according to any one of claims 1 to 7, characterized in that: The following steps are involved: The powder of material A, the particles of material B and the particles of material C are mixed evenly and injected into a rotational molding mold for rotational molding to produce a non-slip rotational molding product.

9. The preparation method according to claim 8, characterized in that: The mixing conditions include: a mixing speed of 10 to 120 rpm and a mixing time of 2 to 20 min.

10. The preparation method according to claim 8, characterized in that: The rotational molding mold is a non-Teflon coating mold.

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