CN115477821A

CN115477821A - Protection pad for trampoline

Info

Publication number: CN115477821A
Application number: CN202211420918.2A
Authority: CN
Inventors: 周杰
Original assignee: Suzhou High Ten Sports Equipment Co ltd
Current assignee: Suzhou High Ten Sports Equipment Co ltd
Priority date: 2022-11-15
Filing date: 2022-11-15
Publication date: 2022-12-16

Abstract

The invention relates to a protection pad for a trampoline, which is prepared from the following raw materials in parts by mass: 80-100 parts of thermoplastic elastomer, 2-3 parts of softener, 0-1 part of coloring agent, 0.5-1 part of foaming agent, 5-10 parts of calcium sulfate and 1-2 parts of glass fiber; the protection pad for the trampoline is prepared by the treatment processes of rubber mixing, extrusion or rolling into sheets, laying of glass fiber, overlapping of multiple layers of films, vacuumizing, foaming, demolding and the like.

Description

Protection pad for trampoline

Technical Field

The invention belongs to the technical field of rubber materials, and particularly relates to a protection pad for a trampoline.

Background

The children trampoline is a fitness and entertainment project which is popular among juveniles, has high playability and guaranteed safety, can exercise the coordination and the cardio-pulmonary function of children well, and can improve the cardio-pulmonary function of children, so the children trampoline can be rapidly popularized in streets and alleys.

Child trampoline adopts stable in structure usually, the elasticity structure that elasticity cloth and spring that the cost is lower combined together, the spring is along radially evenly arranged in elasticity cloth periphery, spring one end is fixed on the frame pipe, the other end is connected with the elasticity cloth of arranging in the frame intraductal, from the safety consideration, still need to set up the protection network around the frame pipe and surround elasticity cloth, furthermore, because of being equipped with great gap between elasticity cloth and the frame pipe, still need adopt annular foam-rubber cushion to cover the gap, the foam-rubber cushion needs to have better support nature, the protective sheath still need be made up to the outside, because annular foam-rubber cushion is bulky, lack professional supporting tool, the protective sheath still adopts the mode of manual leading to make up at present to make, the cost is higher, can't realize efficient full automatic production.

In addition, because in the use, children frequently step on the foam-rubber cushion, the foam-rubber cushion must possess sufficient bending resistance nature, compromise the travelling comfort simultaneously, if the foam-rubber cushion is too hard of doing, although support nature is good, can't play sufficient buffering effect, children feel uncomfortable even be injured when jumping above that easily, if the foam-rubber cushion is too soft, then not durable, local sunken, deformation, tear scheduling problem appear easily.

The patent number is 2016109623346, the name is "an ultra-thin microcellular foam rubber yoga exercise mat and preparation method thereof", and in the Chinese patent, an ultra-thin microcellular foam rubber yoga exercise mat is disclosed, which comprises a microcellular foam rubber layer and a fiber woven mesh fabric compounded at the bottom of the microcellular foam rubber layer, wherein the microcellular foam rubber layer comprises unvulcanized rubber, a filler, an oil agent, a vulcanizing agent, an accelerator, an anti-aging agent, a foaming agent and a dispersing agent. This yoga exercise mat adopts micropore foam rubber to make, only has one deck structure, and the thickness of mat can be controlled very thin, and the consumer of being convenient for carries, and has the fibre to weave the net surface fabric in micropore foam rubber bottom complex, makes the product possess not change the shape because of external force. However, the process still requires vulcanization, and the use of more environmentally friendly thermoplastic elastomers without vulcanization has become the mainstream.

The patent number of 2018106649432, namely Chinese patent named 'a calcium sulfate whisker/styrene-butadiene latex composite foam material and a preparation method thereof', discloses a calcium sulfate whisker/styrene-butadiene latex composite foam material and a preparation method thereof, wherein the raw materials for preparing the calcium sulfate whisker/styrene-butadiene latex composite foam material comprise the following components in parts by weight: 50 to 70 parts of styrene-butadiene latex, 8 to 20 parts of natural rubber latex, 5 to 20 parts of modified calcium sulfate whisker, 0.5 to 4 parts of modified glass fiber, 2 to 6 parts of talcum powder, 0.02 to 0.15 part of calcium chloride, 2 to 6 parts of zinc oxide, 3 to 8 parts of soap solution and 0.5 to 3 parts of benzoyl peroxide; the solid content of the styrene-butadiene latex is 55-68%. The calcium sulfate whisker/styrene-butadiene latex composite foaming material prepared by the invention has the advantages of low density, light weight, strong bearing capacity, excellent mechanical properties such as elongation at break, toughness and the like, good resilience, simple preparation method, easy operation of preparation process and strong dimensional stability of products. However, the material has a large hardness and is not suitable for trampoline pads.

In view of the above, it is desirable to provide a protective mat for a trampoline, which has good support, strong cushioning, and bending resistance.

Disclosure of Invention

The invention aims to provide a trampoline protection pad with moderate hardness, good support and good buffering performance.

In order to solve the technical problem, the invention discloses a protection pad for a trampoline, which is prepared from the following raw materials in parts by mass: 80-100 parts by mass of thermoplastic elastomer, 2-3 parts by mass of softener, 0-1 part by mass of colorant, 0.5-1 part by mass of foaming agent, 5-10 parts by mass of calcium sulfate and 1-2 parts by mass of glass fiber;

the preparation of the protective pad for the trampoline at least comprises the following steps:

s1, adding the raw materials into the ingredients except the glass fiber according to the proportion, and mixing to obtain a rubber compound;

s2, extruding or rolling the rubber compound into a sheet by using an extruder, laying a layer of glass fiber on the upper surface of the sheet, cutting the sheet into films with equal length, and overlapping a plurality of layers of films to fix a layer of glass fiber between each two layers of films;

s3, heating the multi-layer laminated rubber sheets to 120-150 ℃ in a vacuum state, wherein the temperature is not less than 20 kg/m ³ Standing for several minutes under the pressure of the pressure to obtain a press-fit film;

s4, placing the laminated rubber sheet into a mold, and performing foaming molding at 200-230 ℃ to obtain a foaming material plate;

s5, demolding at the temperature of 60-80 ℃, and immediately pressing the plastic foaming material plate by using a multi-convex-point template for 1-2 min to enable a plurality of concave surfaces uniformly distributed to appear on the upper surface of the sizing material;

s6, punching, namely punching the cooled and shaped foaming material plate at the bottom of the concave surface;

and S7, cutting and packaging, namely cutting the foaming material plate, and packaging in a set to obtain a finished product.

Preferably, the calcium sulfate is recovered by dehydration and drying from absorption waste liquid of the marine desulfurization tower, and the sulfur dioxide absorption slurry adopted by the marine desulfurization tower is prepared by taking seawater and limestone as raw materials.

Preferably, the thermoplastic elastomer at least comprises one or more of SBS, SIS, SEPS and EVA;

the softener at least comprises one or a mixture of a plurality of paraffin oil, pine tar, rosin, naphthenic oil and alkyl phenyl sulfonate.

Preferably, in S5, a plurality of bosses with spherical lower portions are uniformly arranged at the bottom of the multi-convex-point template.

Preferably, in S5, when the foam material plate is pressed, the spherical surface at the lower part of the boss contacts with the foam material plate, and the bottom of the mold plate does not contact with the foam material plate.

Preferably, the depth of the concave surface of the foaming material plate is not less than 3mm.

Preferably, in S7, the foam material plate is cut into a fan shape, and locking protrusions and locking grooves are respectively machined on the straight edges of the two sides of the fan-shaped foam material plate, so that the fan-shaped foam material plates can be sequentially connected to form a ring shape.

Preferably, in S2, when laying the glass fibers, filament glass fiber bundles are used, and the glass fibers are arranged in a grid pattern so that the surface portion of the film is exposed from between the glass fiber bundles.

Preferably, in S2, when the glass fiber is laid, the chopped glass fiber with the length of 6-15mm is adopted, the chopped glass fiber is uniformly spread on the surface of the film, before the chopped glass fiber is spread, a baffle plate with a grid or stripe-shaped hollow part is covered on the surface of the film, the baffle plate is removed after spraying, so that the chopped glass fiber is arranged on the surface of the film in a grid or stripe shape, and the surface part of the film is exposed from the chopped glass fiber bundles.

Preferably, the foaming agent comprises at least one or more of sodium bicarbonate, ammonium chloride and ammonium carbonate.

The protection pad for the trampoline at least has the following advantages:

1. the thermoplastic elastomer is adopted as the base material of the protective pad, so that the tactile sensation is more comfortable, the environmental protection is realized, the peculiar smell is less, and the protective pad is more beneficial to the health of children.

2. The multilayer thin sheet and the multilayer glass fiber are arranged in an inserting mode, and the glass fiber in the protective pad is horizontally arranged, so that the protective pad has good compressibility in the vertical direction, and the impact of children jumping on the protective pad can be well buffered; in addition, because of the arrangement of the multiple layers of glass fibers, the protection pad has better bending resistance in the vertical direction and long service life.

3. The thermoplastic elastomer is relatively soft, and the hardness, the wear resistance and the like of the thermoplastic elastomer are appropriately enhanced by calcium sulfate which is dehydrated, dried and recovered from the absorption waste liquid of the marine desulfurization tower.

4. The protection pad adopts the concatenation mode equipment to be the annular, and installation and dismantlement are convenient, also can save simultaneously to make up the protective sheath in order reduce cost.

5. The concave surface sets up, has increased the antiskid nature of protection pad, and the concave surface produces the sucking disc effect and arouses the discomfort when preventing children's light foot walking on the protection pad, punches at the concave surface and can avoid this phenomenon, and simultaneously, the existence in hole also makes things convenient for the drainage, and protection pad surface can not ponding after raining.

Detailed Description

The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.

It will be understood that terms such as "having," "including," and "comprising," when used herein, do not preclude the presence or addition of one or more other elements or groups thereof.

Example 1

A protection pad for a trampoline is prepared from the following raw materials in parts by mass: 100 parts by mass of thermoplastic elastomer, 2 parts by mass of softener, 0.3 part by mass of colorant, 0.8 part by mass of foaming agent, 7 parts by mass of calcium sulfate and 2 parts by mass of glass fiber;

s3, heating the multi-layer laminated rubber sheets to 120-150 ℃ in a vacuum state, wherein the temperature is not less than 20 kg/m ³ Standing for several minutes under the pressure of the pressure sensor to obtain a press-fit film; the vacuumizing helps to discharge air among the films, and the pressing helps to combine the films with each other;

s5, demolding at the temperature of 60-80 ℃, and immediately pressing the plastic foaming material plate by using a multi-convex-point template for 1-2 min to enable a plurality of concave surfaces uniformly distributed to appear on the upper surface of the sizing material; demoulding under higher cooling temperature, the foaming material board that just demolds and not cooled and congealed still has certain plasticity, form a plurality of oppression points through many bumps template on the foaming material board surface of just demolding, not only can extrude skid-proof concave surface, can also form the oppression to multilayer film and glass fiber, make the film and the glass fiber of the department of being pressed produce deformation, the material density of this department also grow, help making multilayer film and glass fiber more inseparable combination be in the same place, prevent that the protection pad from producing the layering phenomenon in long-term use.

The calcium sulfate is obtained by dehydrating, drying and recovering calcium sulfate from absorption waste liquid of the marine desulfurization tower, and the sulfur dioxide absorption slurry adopted by the marine desulfurization tower is prepared by taking seawater and limestone as raw materials. The calcium sulfate crystal prepared by the method is relatively fine, and contains chloride ions to contribute to foaming, which is probably one reason why the calcium sulfate used as a reinforcing agent has better use effect by adopting the calcium sulfate which is dehydrated and dried and recovered from the absorption waste liquid of the marine desulfurization tower.

The thermoplastic elastomer at least comprises SBS;

the softening agent adopts paraffin oil.

And in the S5, a plurality of bosses with spherical lower parts are uniformly arranged at the bottom of the multi-salient-point template.

And S5, when the foaming material plate is pressed, the spherical surface at the lower part of the boss is contacted with the foaming material plate, and the bottom of the template is not contacted with the foaming material plate.

The depth of the concave surface of the foaming material plate is not less than 3mm.

And S7, cutting the foaming material plate into a fan shape, and respectively processing clamping convex blocks and clamping grooves on the straight edges of the two sides of the fan-shaped foaming material plate so that the plurality of fan-shaped foaming material plates can be sequentially connected to form a ring shape.

And S2, when the glass fiber is laid, filament glass fiber bundles are adopted, the glass fiber bundles are arranged in a grid shape, and the surface part of the film is exposed out of the space between the glass fiber bundles. The existence of the glass fiber can generate separation between the films, the part of the surface of the film exposed from the space between the glass fiber bundles can be further combined with the adjacent film under the action of pressure in the step S3, and in the step S4, the part of the surface of the film exposed from the space between the glass fiber bundles is further combined with the adjacent film under the action of foaming treatment; therefore, the layering of the protection pad in the long-term use process can be better avoided.

And the spread chopped glass fiber is adopted, and the spread chopped glass fiber faces to all directions, so that planar support can be better formed, and the spread chopped glass fiber is relatively easier to be embedded into the surface of the rubber sheet and is less prone to layering.

The foaming agent is sodium bicarbonate.

Example 2

And S2, when the glass fiber is laid, adopting the chopped glass fiber with the length of 6-15mm, uniformly spreading the chopped glass fiber on the surface of the film, covering a baffle plate with a grid or strip-shaped hollow part on the surface of the film before spreading the chopped glass fiber, and removing the baffle plate after spraying to ensure that the chopped glass fiber is arranged in a grid or strip shape on the surface of the film, and the surface part of the film is exposed from the chopped glass fiber bundles. Generally, the filament glass fiber bundle can exert better support, and can be laid by directly placing the glass fiber cloth with a larger grid shape on the surface of the film, but the filament glass fiber bundle is not easy to be attached to the film in actual production, and delamination is easy to generate.

Adopting a single variable principle, and carrying out comparison test by taking the content or the processing mode of the chopped glass fiber as a single variable under the condition of keeping other conditions unchanged:

comparative example 1: glass fiber is not added, other ingredients are the same, and the mixture is directly foamed after mixing;

comparative example 2: adding the same mass parts of chopped glass fiber, mixing with other ingredients together, and foaming to obtain a finished product;

comparative example 3: adopting 0.5 mass part of chopped glass fiber, reducing the dosage of the chopped glass fiber of each layer of glass fiber correspondingly, mixing with other ingredients together, and foaming to obtain a finished product;

comparative example 4: 1 part by mass of chopped glass fiber is adopted, the dosage of the chopped glass fiber of each layer of glass fiber is correspondingly reduced, and the chopped glass fiber and other ingredients are mixed together and then foamed to obtain a finished product;

comparative example 5: 1.5 parts by mass of chopped glass fiber is mixed with other ingredients and then foamed to obtain a finished product;

please ask a child weighing 22kg to jump up the middle part of the protection pad (the protection pad is 22mm thick, the outer arc length is 1m, it is maked somebody a mere figurehead to adopt the support plate, it is 0.7m to make somebody a mere figurehead, measure its maximum crookedness downwards, set up a slider that can reciprocate along the ruler after the atress on the ruler, set up the ruler vertically in the middle part that is close to the edge of the outer arc of protection pad, make the protection pad lower part offset with slider upper portion, observe the distance that the slider moves down after the child jumps up, every product measures 10 times and gets the average value, the measuring result is as follows:

therefore, compared with the glass fiber directly mixed in the material, the added multilayer glass fiber obviously contributes to the improvement of the support and the rebound resilience of the protective pad in the aspect of providing the support and the rebound resilience in the vertical direction, and it is worth explaining that the glass fiber directly mixed in the material leads to the increase of the overall hardness of the material, and discomfort is generated, and through the arrangement of the multilayer glass fiber, the softness of the surface of the uppermost layer of the material is not changed along with the dosage of the glass fiber, so children do not feel discomfort easily, but the overall dosage of the glass fiber is still 1-2 parts by mass, and the dosage is too large, so that delamination is easily caused, the buffering effect is reduced in the sense, and the children lose the pleasure of jumping on the surface.

Adopting a single variable method, and carrying out comparison test by taking calcium sulfate as a single variable under the condition that other conditions are not changed;

comparative example 6: calcium sulfate is not added;

comparative example 7: selecting high-purity calcium sulfate (Jiangsu plectrum, content is 99%);

comparative example 8: calcium sulfate (fresh water and limestone are prepared into sulfur dioxide absorption slurry) is recovered by a power plant;

example 2: it is recovered from a marine vessel equipped with a desulfurizing tower (Hui barge (Nantong) environmental protection facility Co., ltd.).

The test results of the pads obtained by averaging the multipoint measurements with a durometer (shore 00 scale, reading 10 s) are as follows:

therefore, compared with calcium sulfate from other sources, the sulfur dioxide absorption slurry prepared by using seawater and limestone as raw materials has a better effect of increasing the hardness of the product. One explanation is that in the marine desulfurization tower system, under the seawater condition, more ions interfere with the crystalline form, which needs to form calcium sulfate crystals at a higher supersaturation degree, and at the time, the calcium sulfate crystals are relatively slender, and meanwhile, the calcium sulfate dehydrated and recovered from the desulfurization tower waste liquid contains more compounds such as polychlorine, magnesium ions and calcium sulfite, and is wholly acidic, which contributes to the reinforcement and foaming of the material to a certain extent, and this may be one of the reasons why the calcium sulfate used as a reinforcing agent has better use effect by adopting the calcium sulfate dehydrated and dried and recovered from the marine desulfurization tower absorption waste liquid.

While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.

Claims

1. A protection pad for a trampoline is characterized by comprising the following raw materials in parts by mass: 80-100 parts by mass of thermoplastic elastomer, 2-3 parts by mass of softener, 0-1 part by mass of colorant, 0.5-1 part by mass of foaming agent, 5-10 parts by mass of calcium sulfate and 1-2 parts by mass of glass fiber;

s3, heating the plurality of layers of laminated films to 120-150 ℃ under the vacuum-pumping state, wherein the temperature is not less than 20 kg/m ³ Standing for several minutes under the pressure of the pressure sensor to obtain a press-fit film;

s5, demolding at the temperature of 60-80 ℃, and immediately pressing the foaming material plate with plasticity for 1-2 min by using a multi-salient-point template, so that a plurality of concave surfaces uniformly distributed on the upper surface of the sizing material are formed;

2. The mat for a trampoline according to claim 1, wherein calcium sulfate is recovered by dehydration and drying from an absorption waste liquid of a marine desulfurization tower, and a sulfur dioxide absorption slurry used in the marine desulfurization tower is prepared from seawater and limestone.

3. A protective mat for a trampoline according to claim 2, wherein said thermoplastic elastomer comprises at least one or more blends of SBS, SIS, SEPS, EVA;

4. The trampoline mat of claim 1, wherein in S5, the plurality of bosses having a spherical lower portion are uniformly formed on the bottom of the multi-boss formwork.

5. The mat of claim 4, wherein in step S5, the lower spherical surface of the boss is in contact with the foam plate and the bottom of the form is not in contact with the foam plate when the foam plate is pressed.

6. A mat for a trampoline according to claim 1, wherein the depth of the concave surface of the foaming material plate is not less than 3mm.

7. The mat for a trampoline according to claim 1, wherein the foaming material plate is cut into a fan shape in S7, and locking protrusions and locking grooves are respectively formed on both side straight edges of the fan-shaped foaming material plate so that the fan-shaped foaming material plates can be sequentially connected to form a ring shape.

8. The mat for a trampoline according to claim 1, wherein the glass fiber bundles are used as the glass fibers in S2, and the glass fibers are arranged in a grid pattern so that the surface portions of the mat are exposed between the glass fiber bundles.

9. The mat for a trampoline according to claim 1, wherein in S2, the chopped glass fiber having a length of 6 to 15mm is used to uniformly spread the chopped glass fiber on the surface of the mat, a baffle plate having a mesh or stripe-like hollow is covered on the surface of the mat before the chopped glass fiber is spread, and the baffle plate is removed after the spreading, so that the chopped glass fiber is arranged in a mesh or stripe-like manner on the surface of the mat, and the surface portion of the mat is exposed from between the chopped glass fiber bundles.

10. A trampoline pad as claimed in claim 1 wherein the foaming agent includes at least one or more of sodium bicarbonate, ammonium chloride, ammonium carbonate.