Nylon composite board for ski

Abstract

The application discloses a nylon composite board for skis, wherein a wear-resistant nylon composite material layer comprises the following components in parts by weight: nylon resin: 43.6-67.5 parts, modified glass flake: 30-55 parts, antioxidant: 0.4-2 parts, and lubricant: 0.5-1 part; and a non-rigid fiber reinforced nylon composite material comprises the following components in parts by weight: nylon resin: 48-70 parts, special nylon fiber: 29-50 parts, antioxidant: 0.2-0.5 parts, and lubricant: 0.5-1 part; the technology introduces the nylon composite material, and a multilayer co-extrusion mode is adopted to prepare the nylon composite board with a wear-resistant skin layer, low water absorption, a high-strength core layer and impact resistance.

Description

Technical Field

[0001] This invention belongs to the field of nylon composite materials and relates to a multilayer co-extruded nylon composite sheet for skis and its preparation method. Background Technology

[0002] Skis are a popular piece of winter sports equipment, widely used for snowboarding activities. The manufacture of traditional skis typically involves the use of various materials and processes, primarily wood, plastics, metals, and fiber-reinforced materials. However, these traditional ski manufacturing materials and processes have some disadvantages that limit their performance and versatility.

[0003] Traditional skis often use wooden bases, which are quite heavy and significantly impact the user's agility and control. Furthermore, wooden bases absorb water, swell, and deform in wet snow or under conditions of significant temperature fluctuations, leading to a decline in performance. Therefore, skis commonly used by ski enthusiasts in daily life and in sporting events employ a method of bonding a fiberglass layer to the wooden base with epoxy resin, improving the board's abrasion resistance and mechanical strength. However, the formulation, curing, and surface treatment of the epoxy resin undoubtedly increase the manufacturing cost and complexity of the skis.

[0004] To address the aforementioned issues, this technology introduces nylon composite materials, employing a multi-layer co-extrusion process to prepare nylon composite sheets with a wear-resistant, low-water-absorption outer layer and a high-strength, impact-resistant core layer. The outer layer utilizes glass flake nylon composite material, while the core layer utilizes a special nylon fiber-reinforced nylon composite material, to meet the different performance requirements of ski board materials. Furthermore, the multi-layer co-extrusion process allows for the pressing and cooling of the outer and core composite materials while they are still molten, resolving the adhesion problem between polymer layers. This technology offers rapid and efficient preparation, requires simple and environmentally friendly equipment, and holds promise for widespread application in the processing and manufacturing of snow sports equipment. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention aims to provide a nylon composite sheet for skis.

[0006] This invention is achieved through the following technical solution:

[0007] A nylon composite sheet for skis, comprising a three-layer co-extruded nylon composite sheet consisting of a wear-resistant nylon composite material layer on both sides and a non-rigid fiber-reinforced nylon composite material layer in the middle core; the wear-resistant nylon composite material layer comprises, by weight, the following components: nylon resin: 43.6-67.5 parts, modified glass flakes: 30-55 parts, antioxidant: 0.4-2 parts, lubricant: 0.5-1 parts; the non-rigid fiber-reinforced nylon composite material comprises, by weight, the following components: nylon resin: 48-70 parts, special nylon fiber: 29-50 parts, antioxidant: 0.2-0.5 parts, lubricant: 0.5-1 parts.

[0008] Preferably, the nylon resin is one of nylon 6 (PA6) or nylon 66 (PA66).

[0009] Preferably, the thickness of the modified glass flakes is 5-20 μm.

[0010] Preferably, the modified glass flakes are prepared by the following steps: soaking and stirring the glass flakes in a solution of silane coupling agent and anhydrous ethanol, followed by drying and grinding.

[0011] Preferably, the coupling agent is at least one of γ-chloropropyltriethoxysilane (KH550), N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane (SG-Si900), γ-aminopropylmethyldiethoxysilane (SG-Si902) or γ-aminopropyltrimethoxysilane (KH540).

[0012] Preferably, the special nylon fiber is at least one of PA46 fiber, PA6T fiber, PA9T fiber, PA10T fiber, and PA12T fiber, with a diameter of 1-5μm.

[0013] Preferably, the antioxidant is at least one of phosphite antioxidants, hindered phenolic antioxidants, or thioester antioxidants; the phosphite antioxidant is at least one of tris(2,4-di-tert-butylphenyl) phosphite or tetrakis(2,4-di-tert-butylphenyl-4,4-biphenyl) diphosphate; the hindered phenolic antioxidant is at least one of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine, octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, or triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate; and the thioester antioxidant is at least one of ditetradecane 3,3-thiodipropionate, distearate 7-thiodipropionate, or didodecane thiodipropionate.

[0014] Preferably, the lubricant is at least one of calcium stearate, aluminum stearate, polyethylene wax, and N,N'-ethylene bis-fatty acid amide.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This technology introduces nylon composite materials, employing a multi-layer co-extrusion process to prepare nylon composite sheets with a wear-resistant, low-water-absorption outer layer and a high-strength, impact-resistant core layer. The outer layer utilizes glass flake nylon composite material, while the core layer utilizes a special nylon fiber-reinforced nylon composite material, to meet the different performance requirements of ski board materials. Furthermore, the multi-layer co-extrusion process allows for pressing and cooling the outer and core composite materials while they are still molten, solving the problem of adhesion between polymer layers. This technology offers rapid and efficient preparation, requires simple and environmentally friendly equipment, and can be widely applied to the processing and manufacturing of snow sports equipment. Implementation

[0017] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0018] The present invention discloses a method for preparing multilayer co-extruded nylon composite sheets for skis, comprising the following steps:

[0019] (1) Place the wear-resistant nylon composite material and the non-rigid fiber reinforced nylon composite material in a forced-air drying oven and dry at 100℃ for 4-8 hours;

[0020] (2) Abrasion-resistant nylon composite material and non-rigid fiber-reinforced nylon composite material are respectively added to a single-screw extruder for melt extrusion, and then multi-layer co-extruded nylon composite sheet is prepared by a three-layer co-extrusion casting machine. The abrasion-resistant nylon composite material is added to the single-screw extruder for the outer two layers, and the non-rigid fiber-reinforced nylon composite material is added to the single-screw extruder for the middle layer. After the melt is extruded through the die, it is fed into the shaping hot roller for pressing, and then traction and cooling are performed to obtain the multi-layer co-extruded nylon composite sheet for skis.

[0021] In step (2), the processing temperature of the single-screw extruder is 220-290℃, with a total of six heating sections and one transition zone, and the die temperature is 260℃. The two single-screw extruders on the outer surface rotate at the same speed, which is 20-50 rpm; the speed of the single-screw extruder in the middle layer is 90-200 rpm.

[0022] In step (2), the temperature of the shaping roller is 180℃-230℃. Example

[0023] The dried wear-resistant nylon composite material was fed into an outer surface single-screw extruder at a speed of 35 rpm. Its components were: PA6 resin: 43.6 parts; modified glass flakes (surface modified with KH550 coupling agent): 55 parts; triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)-propionate antioxidant: 0.4 parts; and N,N'-ethylene bis-fatty acid amide lubricant: 1 part.

[0024] The dried non-rigid fiber-reinforced nylon composite material was fed into a single-screw extruder with an intermediate layer speed of 140 rpm. Its components were: PA6 resin: 58.5 parts, PA6T fiber: 40 parts, triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)-propionate antioxidant: 0.5 parts, and N,N'-ethylene bis-fatty acid amide lubricant: 1 part.

[0025] After being melted and plasticized in a single-screw extruder, the melt is extruded through a die and fed into a 180°C hot roller press for shaping. Following traction and cooling, a multi-layer co-extruded nylon composite sheet for skis is obtained.

[0026] The temperatures of the single-screw extruder are: Zone 1 220℃, Zone 2 250℃, Zone 3 260℃, Zone 4 270℃, Zone 5 270℃, Zone 6 270℃, Transition Zone 260℃, and Die Temperature 260℃.

Claims

1. A nylon composite board for skis, characterized in that, It is a three-layer co-extruded nylon composite board constructed from a wear-resistant nylon composite material layer on both the front and back surfaces and a non-rigid fiber-reinforced nylon composite material layer in the middle core layer; The wear-resistant nylon composite material layer comprises the following components by weight: nylon resin: 43.6-67.5 parts, modified glass flakes: 30-55 parts, antioxidant: 0.4-2 parts, and lubricant: 0.5-1 parts; The non-rigid fiber reinforced nylon composite material comprises the following components by weight: nylon resin: 48-70 parts, special nylon fiber: 29-50 parts, antioxidant: 0.2-0.5 parts, lubricant: 0.5-1 parts; The modified glass flakes are prepared by the following steps: the glass flakes are soaked and stirred in a solution of silane coupling agent and anhydrous ethanol, and then dried and ground. The silane coupling agent is at least one of γ-chloropropyltriethoxysilane, N-(β-aminoethyl)-γ-aminopropyltrimethoxysilane, γ-aminopropylmethyldiethoxysilane, or γ-aminopropyltrimethoxysilane. The special nylon fiber is at least one of PA46 fiber, PA6T fiber, PA9T fiber, PA10T fiber, and PA12T fiber.

2. The nylon composite sheet for skis according to claim 1, characterized in that, The nylon resin is either nylon 6 or nylon 66.

3. The nylon composite sheet for skis according to claim 1, characterized in that, The modified glass flakes are 5-20 μm thick.

4. The nylon composite sheet for skis according to claim 1, characterized in that, The diameter of the special nylon fiber is 1-5 μm.

5. The nylon composite sheet for skis according to claim 1, characterized in that, The antioxidant is at least one of phosphite antioxidants, hindered phenolic antioxidants, or thioester antioxidants. The phosphite antioxidant is at least one of tris(2,4-di-tert-butylphenyl)phosphite or tetrakis(2,4-di-tert-butylphenyl-4,4-biphenyl)bisphosphite. The hindered phenolic antioxidant is at least one of N,N'-bis-(3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionyl)hexamethylenediamine, octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate, or triethylene glycol bis[β-(3-tert-butyl-4-hydroxy-5-methylphenyl)propionate]. The thioester antioxidant is at least one of ditetradecane 3,3-thiodipropionate, distearate thiodipropionate, or didodecane thiodipropionate.

6. The nylon composite sheet for skis according to claim 1, characterized in that, The lubricant is at least one of calcium stearate, aluminum stearate, polyethylene wax, and N,N'-ethylene bis-fatty acid amide.