CN217117585U

CN217117585U - Slow-rebound knee pad

Info

Publication number: CN217117585U
Application number: CN202220823373.9U
Authority: CN
Inventors: 祁青海; 薛健; 胡昭晖; 陈凤秋
Original assignee: Changhua Chemical Technology Co ltd
Current assignee: Changhua Chemical Technology Co ltd
Priority date: 2022-04-11
Filing date: 2022-04-11
Publication date: 2022-08-05
Anticipated expiration: 2032-04-11

Abstract

The utility model relates to a slow-resilience knee pad, which is a cambered surface by adopting a slow-resilience knee pad and is attached to the knee; the slow rebound knee pad sequentially comprises from outside to inside: a fabric layer, an anti-impact layer and comfort; the anti-impact layer is high-damping impact-resistant polyurethane slow-rebound soft foam; the comfortable layer is made of expanded air slow-rebound polyurethane soft foam; the fabric layer, the anti-impact layer and the comfort layer are fixed together by sewing; the upper end of the kneepad is symmetrically provided with 2 openings, and the lower end of the kneepad is symmetrically provided with 2 openings for mounting straps; the tensile strength of the high-damping impact-resistant polyurethane slow-rebound soft foam is more than or equal to 1.5Mpa, the tear strength is more than or equal to 10N/cm, and the impact absorption rate is more than or equal to 65%; the technical scheme that the 40% indentation hardness of the flatulence slow-rebound polyurethane soft foam is 80-100N, and the comfort factor is more than 2.0 well solves the problem, and can be applied to sports protectors.

Description

Slow-rebound knee pad

Technical Field

The utility model relates to a slow kick-back knee-pad belongs to sports protective equipment technical field such as skiing.

Background

Skiing is a popular sport, but when people enjoy the extreme speed sensation of skiing, motorcycles and bicycles and other high-speed sports, people often have a large impact on their bodies, and sports equipment with protective pads, such as protective helmets, goggles, protective gloves and protective clothing, need to be worn to avoid joint injury. The protective pad is fixed on the fragile parts of the human body such as knees, elbows, shoulders, back and the like, so that the risk of injury of athletes can be greatly reduced. Thanks to the continuous development of the material subject, the technology of the sports protector is gradually improved, and at present, the protector mainly comprises EVA, rubber, polyurethane and the like. However, the polyurethane slow-rebound foam has the functions of energy absorption, shock resistance, impact resistance and excellent high damping, so that the polyurethane slow-rebound foam can be widely applied to the buffer protection of children toys, sports insoles, sports protectors and electronic components.

Chinese patent CN212938013U discloses a high-buffering knee pad with a honeycomb-hole-shaped pouring foaming soft inner pad, which comprises a polyurethane foaming layer, a polyurethane gel layer and a textile fabric layer, wherein the polyurethane gel layer is provided with a plurality of connecting through holes, the components of the polyurethane foaming layer flow through the connecting through holes in the foaming process, the foaming body formed after foaming is filled in the connecting through holes, meanwhile, the polyurethane gel layer is coated in the polyurethane foaming layer, and an adhesive integrated structure is formed after heating, foaming and curing; the outer surface of the textile fabric layer is pressed and adhered to the polyurethane foaming layer, and the inner surface of the textile fabric layer is correspondingly adhered to the surface of a human body. This patent high buffering knee pad, with the gel layer embedding to polyurethane foaming in situ portion, do not bring the promotion of wearing the comfort level in essence, the gel layer of relative flexibility has replaced the anti-impact layer of rigidity moreover, also can reduce the barrier propterty of whole protective equipment to a certain extent.

Chinese patent CN207252840U discloses a soft and comfortable high-buffer knee pad, which adopts polyurethane composite foaming material and high-damping foaming silicon rubber material to realize the protection effect of softness and high impact bearing capacity of the knee pad product. The scheme uses two completely different materials, completely different production equipment and raw materials are needed, and the high-damping silicone rubber is high in cost, not beneficial to marketization and not suitable for production and manufacturing of general enterprises.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that there is current skiing knee-pad material singleness among the prior art, can't have the problem of safety protection function and comfort level concurrently. The slow-rebound knee pad has the characteristics of warm keeping, comfort, excellent impact resistance, light weight and low cost.

In order to solve the technical problem, the utility model discloses a technical scheme as follows: a slow rebound knee pad is characterized in that the whole body of the slow rebound knee pad is a cambered surface and is attached to a knee; it is characterized in that the slow rebound knee pad sequentially comprises from outside to inside: a fabric layer, an anti-impact layer and a comfort layer; the anti-impact layer is high-damping impact-resistant polyurethane slow-rebound soft foam; the comfortable layer is made of expanded air slow-rebound polyurethane soft foam; the fabric layer, the anti-impact layer and the comfort layer are fixed together by sewing; the upper end of the kneepad is symmetrically provided with 2 openings, and the lower end of the kneepad is symmetrically provided with 2 openings for mounting straps; wherein the tensile strength of the high-damping impact-resistant polyurethane slow-rebound soft foam is more than or equal to 1.5Mpa, the tearing strength is more than or equal to 10N/cm, and the impact absorption rate is more than or equal to 65%; the 40% indentation hardness of the flatulence slow rebound polyurethane flexible foam is 80-100N, and the comfort factor is greater than 2.0, namely the 65%/25% indentation ratio is greater than 2.0.

In the above technical scheme, preferably, the high-damping impact-resistant slow-rebound flexible polyurethane foam comprises the following components in parts by weight: the component A comprises: polyether polyol a: 40-80 parts of polyether polyol b: 10-40 parts of polyether polyol c: 10-40 parts of foaming agent: 0.1-1.5 parts of a reaction type catalyst: 0.5-1.5 parts of foam stabilizer: 0.5-1.0 part of cross-linking agent: 2-8 parts of a chain extender, 2-6 parts of a pore-forming agent: 1-5 parts; and B component: isocyanate: 30-60 parts of polyether polyol d: 10-40 parts; the weight part ratio of the component A to the component B is 100: 30-60 parts of; wherein the polyether polyol a is polyester polyether polyol, the molecular weight is 600-3000, the viscosity is 1000-2500 mpa · s, the functionality is 2-4, and the ester group content is 10-40%; the polyether polyol b is polyether polyol taking at least one of propylene glycol, pentaerythritol, xylitol, sorbitol or sucrose as an initiator, the molecular weight of the polyether polyol is 200-3000, the unsaturation degree is 0.01-0.2 mmol/g, and the functionality degree is 2-4; the polyether polyol c is polyether polyol taking at least one of glycerol, pentaerythritol, xylitol, sorbitol or sucrose as an initiator, the molecular weight of the polyether polyol is 3000-10000, the unsaturation degree is 0.01-0.2 mmol/g, and the functionality degree is 2-4; the foam stabilizer is polysiloxane-oxyalkylene block or graft copolymer; the cross-linking agent is micromolecular polyalcohol containing more than two functional groups and a polyamine compound; the chain extender is a non-amine micromolecular alcohol compound containing two functional groups; the cell opener is a polyoxyalkylene-polysiloxane copolymer; the isocyanate is selected from at least one of toluene diisocyanate, crude MDI or carbodiimide modified isocyanate; the polyether polyol d is polyether polyol taking at least one of propylene glycol, pentaerythritol, xylitol, sorbitol or sucrose as an initiator and having a molecular weight of 1000-6000, an unsaturation degree of 0.01-0.2 mmol/g and a functionality of 2-4.

In the technical scheme, preferably, the thickness of the center of the anti-impact layer is 10-15 mm, and the thickness of the edge of the anti-impact layer is 5-10 mm.

Among the above-mentioned technical scheme, preferably, comfortable layer center department thickness be 8 ~ 12mm, edge thickness be 4 ~ 8 mm. The comfortable layer has excellent comfort performance, and simultaneously, its inside porous slight-expanding structure, isolated external wet cold air current that can be fine has better heat preservation cold-proof function to the knee.

In the above technical scheme, preferably, a glue layer is arranged between the anti-impact layer and the comfort layer, and the thickness of the glue is 0.1-0.5 mm. The glue is polyurethane water-based glue. The anti-impact layer and the comfort layer are bonded by polyurethane water-based glue or directly sewn together.

In the above technical scheme, preferably, the fabric layer is a silver ion antibacterial and anti-mite fabric.

In the above technical solution, preferably, the straps are mounted on the openings of the knee pads in a manner of a turnbuckle or a hook-and-loop fastener.

In the technical scheme, preferably, the upper end of the kneepad is provided with 2 triangular opening structures, the length ratio of the depth of the triangular opening structures to the overall depth is 0.5-0.85: 1, and the opening angle alpha is 10-20 degrees.

In the above technical solution, preferably, the shoulder strap is made of chemical fiber material such as nylon.

The utility model provides a pair of slow kick-back knee-pad can protect skiing and high-speed sports fan's knee effectively. In the existing knee-pad products, a single-layer damping structure is mostly adopted or composite materials are used, and the materials often lack comfort or have complex production process and high cost. The utility model provides a knee-pad of kick-backing slowly comprises comfortable layer and anti towards the layer, can have safety protection function and comfort level concurrently, for this type of sports fan brings higher wearing to experience. Meanwhile, the materials used by the kneepad are polyurethane, so that the kneepad has low requirements on production process and equipment, and is suitable for production of most enterprises.

Drawings

Figure 1 is a schematic plan view of a slow rebound knee brace of a multi-layer construction.

Figure 2 is a half-sectional view of a slow rebound knee brace having a multi-layer construction.

Figure 3 is a schematic perspective view of a slow rebound knee brace of a multi-layer construction.

Wherein, 1 is an anti-impact layer, 2 is a comfortable layer, 3 is a fabric layer, 4 is a strap, and 5 is an opening structure.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Example 1:

a slow rebound knee pad is characterized in that the whole body of the slow rebound knee pad is a cambered surface and is attached to a knee; it is characterized in that the slow rebound knee pad sequentially comprises from outside to inside: a fabric layer 3, an anti-impact layer 1 and a comfort layer 2; the impact-resistant layer 1 is high-damping impact-resistant slow-rebound soft polyurethane foam; the comfortable layer 2 is an inflation slow-rebound polyurethane soft foam; the fabric layer 3, the anti-impact layer 1 and the comfort layer 2 are fixed together by sewing; the upper end of the kneepad is symmetrically provided with 2 openings, and the lower end of the kneepad is symmetrically provided with 2 openings for mounting a shoulder strap 4; the anti-impact layer 1 is made of high-damping impact-resistant polyurethane slow-resilience protective equipment material, the comfortable layer 2 is made of flatulence slow-resilience polyurethane soft bubbles, the fabric layer 3 is silver ion antibacterial anti-mite fabric, and the straps 4 are connected in a magic tape mode.

The thickness of the center of the impact resistant layer 1 is 12mm, and the thickness of the edge is 6 mm; the thickness of the comfortable layer 2 is 10mm at the center and 5mm at the edge; a glue layer is arranged between the anti-impact layer 1 and the comfort layer 2, the glue is polyurethane water-based glue, and the thickness of the glue is 0.3 mm. The knee protecting segment is provided with 2 triangular opening structures 5, and the depth L of the triangular opening structures ₁ To the overall depth L ₂ Is 0.75: 1, the opening angle α is 15 °.

A. Preparation of impact-resistant layer 1

(1) Preparation of component A: respectively weighing 40 parts of CHE-214LF (manufacturer: Changhua chemical), 20 parts of CHE-204 (manufacturer: Changhua chemical), 40 parts of CHE-330N (manufacturer: Changhua chemical), 0.1 part of foaming agent water, 0.3 part of reactive catalyst triethylene diamine, ZF-100.2 parts, B-80021.0 parts of foam stabilizer, 4 parts of cross-linking agent triethanolamine, 4 parts of diethanol amine, 1 part of chain extender ethylene glycol, 1 part of 1, 4-butanediol and SKC-19002 parts by weight, sequentially adding the components into a container, and fully stirring and mixing to obtain the component A.

(2) Preparation of the component B: weighing 10 parts of CHED-28 (manufacturer: Changhua chemical), adding the CHED-28 into a reaction kettle, stirring and heating to 90-100 ℃, dehydrating and degassing for 2-3 hours under a vacuum condition, cooling, adding 15 parts of liquefied MDI and M20S 35, heating to 85 ℃ for reaction for 2 hours, and detecting the NCO content to be 18.5% to obtain a component B.

(3) Raising the temperature of the mold to 60 ℃, and uniformly spraying a release agent 3011B on the inner surface of the mold; waiting for 3min, and curing the release agent on the surface of the mold to form a film; mixing the prepared component A and component B according to the ratio of 100: mixing at a ratio of 60, fully stirring for 5S at the rotating speed of 2500rpm, quickly injecting into a mold, closing the mold and locking; and (3) keeping the mold for 7 minutes, then opening the mold, taking out the product, curing for 48 hours at normal temperature, and putting the polyurethane slow-rebound buffer material into use. The polyurethane slow rebound buffer material has the tensile strength of 1.508Mpa, the tearing strength of 11.24N/cm and the impact absorption rate of 73 percent.

B. Preparation of the comfort layer 2

According to the weight portion, 70 portions of CHE-3602 (manufacturer: Changhua chemical), 30 portions of CHE-5110VE (manufacturer: Changhua chemical), 5 portions of physical foaming agent (dichloromethane), 2 portions of deionized water, 0.5 portion of reactive catalyst triethylene diamine, 10.2 portions of A and 11680.35 portions of foam stabilizer DN are respectively weighed and sequentially added into a container to be fully stirred and mixed, so as to obtain the component A. Mixing material B consisting of 30 parts of modified isocyanate MDI3133 (manufacturer: Jinhu Sanjing), quickly stirring, pouring into a knee-pad mould, keeping the mould for 5-7 minutes, and opening the mould to obtain flatulence slow-resilience foam, namely the comfort layer 2; the comfort layer had a 40% indentation hardness of 88N and a comfort factor of 2.6.

C. Preparation of slow rebound knee pad

The prepared impact-resistant layer 1 and the comfort layer 2 are tightly attached by using the aqueous polyurethane glue, then the two layers are sewn into the fabric layer 3, and finally the straps are inserted into the kneepad body, so that the slow-resilience kneepad is prepared, wherein the impact coefficient can reach 65%, and the comfort factor is above 2.0.

The above is a research example of the present invention, and it should be noted that various changes, modifications and variations can be made to these examples without departing from the technical principle of the present invention.

Claims

1. A slow rebound knee pad is characterized in that the whole slow rebound knee pad is in a cambered surface and is attached to a knee; it is characterized in that the slow rebound knee pad sequentially comprises from outside to inside: a fabric layer (3), an anti-impact layer (1) and a comfort layer (2); the anti-impact layer (1) is high-damping impact-resistant polyurethane slow-rebound soft foam; the comfortable layer (2) is an inflation slow-rebound polyurethane soft foam; the fabric layer (3), the anti-impact layer (1) and the comfortable layer (2) are fixed together by sewing; 2 openings are symmetrically arranged at the upper end of the kneepad, and 2 openings are symmetrically arranged at the lower end of the kneepad and used for mounting straps (4); wherein the tensile strength of the high-damping impact-resistant polyurethane slow-rebound soft foam is more than or equal to 1.5Mpa, the tearing strength is more than or equal to 10N/cm, and the impact absorption rate is more than or equal to 65%; the 40% indentation hardness of the flatulence slow rebound polyurethane flexible foam is 80-100N, and the comfort factor is greater than 2.0.

2. The slow rebound knee brace according to claim 1 wherein the impact resistant layer (1) has a thickness of 10 to 15mm at the center and 5 to 10mm at the edges.

3. The slow rebound knee brace according to claim 1 wherein the comfort layer (2) has a thickness of 8 to 12mm at the center and 4 to 8mm at the edges.

4. The slow rebound knee brace according to claim 1 wherein a glue layer is provided between the impact resistant layer (1) and the comfort layer (2), the thickness of the glue being 0.1-0.5 mm.

5. The slow rebound knee pad according to claim 1 wherein the fabric layer (3) is silver ion antibacterial anti-mite fabric.

6. Slow rebound knee brace according to claim 1, wherein the straps (4) are mounted on the 4 openings of the knee brace by means of a hook and loop fastener or a velcro tape.

7. The slow rebound knee brace according to claim 1 wherein 2 triangular opening structures (5) are provided at the upper end of the knee brace, the length ratio of the depth of the triangular opening structures (5) to the overall depth is 0.5 to 0.85:1, and the opening angle α is 10 to 20 °.