CN115590333A

CN115590333A - Lattice structure elastomer and elastic pad made of lattice structure elastomer

Info

Publication number: CN115590333A
Application number: CN202211154085.XA
Authority: CN
Inventors: 吴玲; 芮正国; 李铭豪; 张春武
Original assignee: Oechsler Plastic Products Taicang Co Ltd
Current assignee: Oechsler Plastic Products Taicang Co Ltd
Priority date: 2022-09-21
Filing date: 2022-09-21
Publication date: 2023-01-13
Also published as: WO2024060679A1

Abstract

The invention relates to an elastomer with a lattice structure and an elastic cushion made of the elastomer with the lattice structure, wherein the elastomer with the lattice structure is a thermoplastic elastomer forming different elastic supporting areas, the elastic supporting areas are at least divided into a comfort area and a supporting area in an XYZ three-axis coordinate system, and the softness formed by the comfort area is greater than the softness formed by the supporting area. According to the invention, through the layout of different elastic supporting areas, not only can the required supporting force be provided, but also the formed comfortable area can provide the soft and comfortable requirements, and meanwhile, according to the deformation difference of the areas, the air permeability of the lattice structure elastomer is kept, and the sultry is avoided.

Description

Lattice structure elastomer and elastic pad made of lattice structure elastomer

Technical Field

The invention belongs to the field of articles for daily use, and particularly relates to an elastomer with a lattice structure and an elastic pad made of the elastomer based on the lattice structure.

Background

In many applications where cushioning or support is desired, such as seat or back cushions, mattresses, sofa cushions and the like, it is desirable to use elastomeric materials that are high strength, high elasticity (resistance to compression), high impact resistance and light weight.

At present, thermoplastic powder is used as a raw material, and an elastomer formed by 3D printing is applied to various occasions due to the advantages of simple forming process, environmental protection, high raw material utilization rate, recoverability, high precision and the like.

However, for example, to meet the requirements of mechanical properties and breathability, the porosity of the elastomer is small and remains equal, and therefore, when used as an elastic pad, it has the following drawbacks:

1. because the elastic force provided by the elastic body is relatively balanced and has no soft or hard part, the elastic cushion is concave in a transitional way after being stressed, so that the deformation area is large and the air permeability is influenced; or the deformation is too small, resulting in insufficient comfort.

2. The mechanical properties (such as compression resistance) of the elastic body cannot meet the use requirements due to the factors of melt shrinkage, weak bonding among powder particles, more gaps and the like, and if the compression resistance of the elastic body is enhanced, the thickness of the elastic body is increased, so that the formed elastic cushion has large volume.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art and provide an improved lattice structure elastomer.

Meanwhile, the invention also relates to an elastic cushion made of the elastomer based on the lattice structure.

In order to solve the technical problem, the invention adopts the following technical scheme:

a lattice structure elastomer is a thermoplastic elastomer forming different elastic supporting areas, the elastic supporting areas are divided into at least a comfort area and a supporting area in an XYZ three-axis coordinate system, and the softness formed by the comfort area is greater than the softness formed by the supporting area.

Preferably, an elastic resin layer is formed on the thermoplastic elastomer, the elastic resin layer is formed at least in the inner pores of the thermoplastic elastomer and is bonded to the thermoplastic elastomer, and the thermoplastic elastomer and the elastic resin layer constitute a unit cell structure.

In short, the lattice structure elastomer is fully contacted with a treatment solution containing an elastic resin or raw materials for forming the elastic resin and a resin curing agent, and is heated and cured, the elastic resin forms an elastic resin layer in the internal pores of the lattice structure elastomer and on the outer surface of the lattice structure elastomer, and the elastic resin and the lattice structure elastomer are cured, bonded and compounded to fill the internal pores of the lattice structure elastomer, so that the lattice structure with excellent mechanical properties can be obtained. The unit cell structure has higher compression resistance under the same weight; the material has a lower weight, while achieving the same compression properties. In addition, the elastic resin layer positioned on the outer surface of the lattice structure elastomer can reduce the surface roughness of the material, so that the surface of the unit cell structure is smooth.

According to a specific implementation and preferred aspect of the present invention, the elastic resin layer is further formed on an outer surface of the lattice-structured elastic body; or/and the pressure required for the cell structure to be compressed to a deformation of 50% is greater than 270N; or/and the thermoplastic elastomer has a porosity of 5% to 40%.

Preferably, the elastic resin composing the elastic resin layer has a hardness of 50A shore or more and 40D shore or less, a viscosity of less than 12000cP at 25 ℃, a tensile strength of 5MPa or more, and an elongation at break of 120% or more.

Preferably, the mass of the elastic resin layer is the lattice structure elastic body10% -50% of the amount; and/or the density of the thermoplastic elastomer is 0.7-1.1g/cm ³ 。

Preferably, the cell structure is formed by coating the elastic body with a treatment solution containing the elastic resin or its raw material and a curing agent.

Preferably, the coating treatment is performed by spraying, dipping or plating, and the treatment liquid is allowed to penetrate into the internal pores of the lattice-structured elastomer.

In some embodiments, the time for the coating treatment is 5 to 20min and the time for the heating treatment is 3 to 12h.

Further, the mass concentration of the elastic resin in the treatment liquid is 30-60%, and the mass concentration of the curing agent is 1-10%. In some embodiments, the mass concentration of the elastomeric resin in the treatment fluid is 40-55% and the mass concentration of the curing agent is 2-5%.

In some embodiments, the heat curing is performed at a temperature of 80 to 100 ℃, and the coating treatment and the heat curing are performed once or repeated 1 to 3 times after one time.

Further, the resin constituting the thermoplastic elastomer is one or a combination of two selected from a thermoplastic polyurethane resin and a thermoplastic polyethylene resin.

In some embodiments of the present invention, the elastic resin constituting the elastic resin layer is a combination of one or more selected from a polyurethane resin, an acrylic resin, and a silicone resin.

That is, the lattice structure elastomer is prepared by 3D printing. By adjusting parameters such as 3D printing temperature and laser energy, the sintering density and porosity of the elastomer with the lattice structure can be controlled, and further the penetration depth and quality of the elastic resin can be controlled. The lower the temperature and the laser power, the higher the porosity of the printed elastomer with a lattice structure, the higher the content of the elastomeric resin in the cell structure, and the better the compression resistance of the cell structure.

In some embodiments, the parameters used are as follows: the temperature is 80-140 ℃, the laser power is 30-100W, the scanning speed is 4000-12000mm/s, and the scanning interval is 0.1-0.3mm.

Meanwhile, the lattice cell structure constituting the lattice structure elastomer is not particularly limited. The lattice cell structure may be a common cube, star, octagon, hexagon, rhombus, tetrahedron, etc.

The other technical scheme of the invention is as follows: an elastic pad includes a lattice-structured elastomer and an elastic resin layer.

Preferably, the elastic cushion is an office chair cushion or an automobile chair cushion, wherein the office chair cushion comprises a cushion body and a backrest body which have different elastic supporting forces; the automobile seat cushion comprises a headrest part, a cushion part and a cushion part which all have different elastic supporting forces.

In some embodiments, the cushion body comprises a comfort zone and a support zone arranged from top to bottom, the comfort zone and the support zone form a unit cell structure with the same size, and the unit cell rod diameter of the unit cell structure from bottom to top gradually decreases.

In some embodiments, the backrest body comprises a waist support body and a back support body, wherein the waist support body and the back support body are integrally arranged up and down and form a one-piece backrest cushion or form a left backrest and a right backrest which are bilaterally symmetrical, the cell sizes of the cell structures formed by the backrest cushions are the same, and the cell rod diameters of the cell structures formed from back to front are gradually reduced; the left backrest comprises a supporting area positioned in the middle and comfort areas positioned on two sides of the supporting area, and the cell sizes of the unit cell structures from the middle to the two sides are gradually increased and the cell rod diameters are gradually decreased.

Furthermore, the office chair cushion also comprises a headrest cushion formed above the backrest cushion, the headrest cushion comprises a supporting area positioned in the middle and comfort areas positioned on two sides of the supporting area, and the cell sizes of the unit cell structures from the middle to the two sides are gradually increased and/or the cell rod diameters are gradually decreased.

In some embodiments, the headrest portion includes a support layer and a comfort layer integrally formed from the rear to the front, wherein the comfort layer has a cell size of a unit cell structure formed by the support layer smaller than a cell size of a unit cell structure formed by the support layer, and the comfort layer has a porosity larger than a porosity of the support layer.

In some embodiments, the back cushion portion includes a lumbar support region and a back support region disposed above and below, the cell sizes of the cell structures of the back support region and the lumbar support region are the same, and the cell diameters of the cell structures formed from the back to the front of the back support region and the lumbar support region are different.

In some embodiments, the cushion portion sequentially forms a rear support, a middle support and a front support along a length direction thereof, wherein a thickness formed from the rear to the front is gradually increased, and a porosity formed by the rear support, the middle support and the front support is gradually increased.

Preferably, in a side view projection formed by the end surface of the cushion part in the length direction, the front support body and the rear support body are respectively positioned at the left end and the right end, wherein the right side contour edge of the rear support body is continuously bent inwards and outwards from top to bottom; and/or the left side contour edge of the front support body is in fillet transition; and/or the upper side contour edge and the lower side contour edge of the middle support body are symmetrically arranged relative to the middle part, and the upper side contour edge and the lower side contour edge respectively extend obliquely from left to right.

Preferably, the cushion part comprises a front support body, a middle support body and a rear support body which are sequentially formed along the length direction of the cushion part, wherein the thicknesses of the rear support body, the middle support body and the front support body are equal; or/and the rear support body, the middle support body and the front support body are respectively divided into a plurality of supporting layers from the thickness direction, and the diameter of the cell element rod of the unit cell structure formed by each supporting layer from bottom to top is gradually reduced; or/and the porosity of the lattice structure formed from bottom to top is gradually increased.

Further, the front supporter is bent forward and downward; the elastic supporting force formed by the rear supporting body is larger than that formed by the front supporting body, and the elastic supporting force formed by the front supporting body is smaller than or equal to that formed by the middle supporting body.

Preferably, the cushion portion includes a square inner core, and a core cover formed on an outer periphery of the inner core, wherein the elastic resin layer is formed on the inner core or/and the core cover.

Further, the core sleeve comprises an upper sleeve layer, a lower sleeve layer, a front sleeve layer and a rear sleeve layer, wherein the upper sleeve layer and the lower sleeve layer are symmetrically arranged, and the front sleeve layer and the rear sleeve layer are symmetrically arranged; or/and the porosity of the upper jacket layer is less than or equal to that of the inner core, and the porosity of the front jacket layer is greater than or equal to that of the upper jacket layer.

Preferably, the office chair cushion or the automobile chair cushion further comprises an armrest part, wherein the armrest part comprises a comfort area and a support area which are arranged from top to bottom, and the diameters of the poles of the unit cell structure formed from bottom to top are gradually reduced; or/and the porosity of the lattice structure formed from bottom to top is gradually increased; or/and, the office chair cushion or the automobile chair cushion also comprises side supporting parts formed at two sides of the cushion part, wherein the structure of the side supporting parts is the same as that of the armrest part.

Preferably, the elastic cushion is a sofa cushion or a mattress, and the sofa cushion or the mattress comprises a comfort area at the upper part and a support area at the lower part, wherein the cell element shapes of the unit cell structures formed by the comfort area and the support area are different, and the cell element rod diameters are gradually reduced from bottom to top; or, the sofa cushion or the mattress comprises a supporting area in the middle, and a comfort area in the upper and lower parts of the supporting area, wherein the comfort area and the supporting area form a unit cell structure with different shapes, and the unit cell rod diameter of the unit cell structure in the middle is larger than that of the unit cell structure in the upper or lower part.

Due to the implementation of the technical scheme, compared with the prior art, the invention has the following advantages:

according to the invention, through the layout of different elastic supporting areas, not only can the required supporting force be provided, but also the formed comfortable area can provide the soft and comfortable requirements, and meanwhile, according to the deformation difference of the areas, the air permeability of the lattice structure elastomer is kept, and the sultry is avoided.

Drawings

FIG. 1 is a schematic structural view of a lattice-structured elastomer in example 1;

FIG. 2 is a schematic perspective view of a vehicle seat according to embodiment 2;

FIG. 3 is a schematic structural view of the cushion part in FIG. 2;

FIG. 4 is a front view of FIG. 3;

fig. 5 is a front view of the cushion part in embodiment 2 (1);

fig. 6 is a front view of the cushion part in embodiment 2 (2);

fig. 7 is a front view of the cushion part in embodiment 2 (3);

fig. 8 is a front view of the cushion part in embodiment 2 (4);

FIG. 9 is a top view of FIG. 8;

fig. 10 is a schematic perspective view of an office chair according to embodiment 3 (1);

fig. 11 is a schematic perspective view (2) of an office chair according to embodiment 4;

FIG. 12 is a schematic perspective view of a mattress according to example 5;

FIG. 13 is a schematic perspective view of the sofa cushion according to example 6;

wherein: 1. a unit cell structure; 10. a lattice-structured elastomer; 10a, a front support; 10b, a middle support body; 10c, a rear support; 100. an inner core; 101. a core sleeve; a. coating a jacket layer; b. a lower jacket layer; c. a front jacket layer; d. a back jacket layer; z, a support layer; z1, an upper support layer; z2, a middle support layer; z3, a lower supporting layer; (1) a headrest portion; (2) a back cushion part; (3) a cushion part; (4) a temple portion; 100a, a support layer; 100b, a comfort layer; 100c, a lumbar support region; 100d, a back support zone; 100e, comfort zone; 100f, a support area; A. a headrest pad; B. a cushion body; C. a backrest body; 1h, a comfort zone; 1f, a support area; 1g, a waist support body; 1t, a back support; 1k, a backrest cushion; 1L, a left backrest; 1R and a right backrest.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiment in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and therefore the application is not limited to the specific embodiments disclosed below.

Example 1

The lattice structure elastomer of the present embodiment is a thermoplastic elastomer forming different elastic support regions, the elastic support regions are divided into at least a comfort region and a support region in an XYZ triaxial coordinate system, and the softness formed by the comfort region is greater than the softness formed by the support region.

As shown in fig. 1, the thermoplastic elastomer 10 includes a comfort zone 100e and a support zone 100f layered one above the other, and the comfort zone 100e and the support zone 100f form a unit cell structure having the same cell size, and the cell rod diameter of the unit cell structure gradually decreases from bottom to top.

Specifically, the porosity of the comfort zone 100e is greater than the porosity of the support zone 100f, and the porosity of the formed thermoplastic elastomer is 5% to 40%.

In the example, thermoplastic Polyurethane (TPU) is used as a raw material, the elastomer with the lattice structure is printed out in a 3D mode through powder sintering forming, the process parameters are that the main temperature is 100-120 ℃, the laser power is 50W, the scanning speed is 4000-1000mm/s, the scanning distance is 0.2mm, and meanwhile, the pressure required when the thermoplastic elastomer 10 is compressed to be 50% of deformation is larger than 150N.

Example 2

As shown in fig. 2, the elastic cushion of the present embodiment is a seat cushion provided on a vehicle seat, and the seat cushion includes a headrest portion (1), a backrest cushion portion (2), and a seat cushion portion (3).

Specifically, each portion constituting the seat cushion includes a cell structure 1, and the cell structure 1 includes a thermoplastic elastomer 10 and an elastic resin layer.

The thermoplastic elastomer 10 is a thermoplastic elastomer, and constitutes a seat cushion, and each unit cell structure 1 forms different elastic support force.

The porosity of the thermoplastic elastomer is 10% -30%, and the thermoplastic elastomer is formed by powder sintering and 3D printing.

The elastic resin layer is partially formed in the inner pores of the thermoplastic elastomer 10 and bonded with the thermoplastic elastomer 10, and the remaining portion is formed on the outer surface of the thermoplastic elastomer 10. Thus, the cell structure 1 constituting each part of the cushion requires a pressure of more than 270N when compressed to a deformation of 50%.

The elastic resin composing the elastic resin layer has a hardness of 50A Shore hardness or more and 40D Shore hardness or less, a viscosity of less than 12000cP at 25 ℃, a tensile strength of 5MPa or more, and an elongation at break of 120% or more.

The mass of the elastic resin layer is 20-25% of the mass of the lattice structure elastomer. The strength, elasticity and impact resistance of the unit cell structure are improved, and the weight is optimally reduced on the premise of ensuring enough elastic buffering capacity.

The lattice structured elastomer was prepared by 3D printing. By adjusting parameters such as 3D printing temperature and laser energy, the sintering density and porosity of the elastomer with the lattice structure can be controlled, and further the penetration depth and quality of the elastic resin can be controlled. The lower the temperature and the laser power, the higher the porosity of the printed elastomer with a lattice structure, the higher the content of the elastomeric resin in the cell structure, and the better the compression resistance of the cell structure.

In some embodiments, the parameters used are as follows: the temperature is 80-140 ℃, the laser power is 30-100W, the scanning speed is 4000-10000mm/s, and the scanning interval is 0.1-0.3mm.

In this example, the thermoplastic elastomer 10 is a thermoplastic elastomer forming different elastic support regions, the elastic support regions are divided into at least a comfort region and a support region in a XYZ three-axis coordinate system, and the softness formed by the comfort region is greater than the softness formed by the support region.

Specifically, the thermoplastic elastomer 10 of the headrest portion (1) includes a support layer 100a and a comfort layer 100b integrally formed from the back to the front, wherein the comfort layer 100b has a cell size of a unit cell structure smaller than that of the support layer 100a, and the comfort layer 100b has a porosity larger than that of the support layer 100 a. That is, the user's head is first brought into contact with the comfort layer 100b and provides comfortable elastic support under the common elastic support formed by the support layer 100a and the comfort layer 100 b.

The thermoplastic elastomer 10 formed by the cushion part (2) comprises a lumbar support region 100c and a back support region 100d which are arranged up and down, the cell sizes of the cell structures of the back support region 100d and the lumbar support region 100c are the same, and the cell rod diameters of the cell structures formed by the back support region 100d and the lumbar support region 100c from back to front are different. That is, by providing different elastic support from the lumbar support region 100c and the back support region 100d, the back support region 100d must generally provide a greater support force than the lumbar support region 100c, however, it should be noted that the back support region 100d is stiffer than the lumbar support region 100c so as to provide a cushion that follows the curve of the lumbar region.

Referring to fig. 3 and 4, the thermoplastic elastomer 10 formed by the cushion part (3) includes a comfort zone 100e and a support zone 100f layered up and down, the cells of the unit cell structure formed by the comfort zone 100e and the support zone 100f have the same size, and the cell rod diameter of the unit cell structure formed from bottom to top gradually decreases.

In this example, the two sides of the cushion part (3) are respectively provided with side supporting parts (4), wherein the side supporting parts (4) are symmetrically arranged, and the thermoplastic elastomer 10 formed by the side supporting parts (4) is the same as that of the cushion part (3).

As shown in fig. 5, the thermoplastic elastomer 10 formed of the cushion part (3) includes a front support 10a, a middle support 10b, and a rear support 10c formed in this order along the longitudinal direction thereof.

Specifically, the thickness of the thermoplastic elastomer 10 gradually increases from the back to the front, and the porosity of the rear supporter 10c, the middle supporter 10b, and the front supporter 10a gradually increases. The holding power that forms like this provides different elastic support along with different positions exert force to satisfy different crowds' comfort level demand, under high strength supports, ensure the gas permeability of self moreover, effectively improve the heat dispersion of cushion, alleviate stifled.

Specifically, the pressure required when the front support is compressed to a deformation of 50% after forming the elastic resin layer is greater than 200N.

Meanwhile, in a side view projection formed by the end face of the thermoplastic elastomer 10 in the length direction, the front support 10a and the rear support 10c are respectively located at the left end and the right end, wherein the left side contour edge of the front support 10a is in fillet transition; the right side contour edge of the rear support 10c is continuously bent inward and outward from the top down.

The upper and lower profile sides of the middle supporter 10b are symmetrically disposed about the middle portion, and the upper and lower profile sides are respectively extended straight obliquely from left to right. The comfort degree formed by the method can better meet the comfort degree of different people.

Referring to fig. 6, the thermoplastic elastomer 10 formed by the cushion part (3) includes a square inner core 100, a core sleeve 101 formed on the outer periphery of the inner core 100, and the pressure required for the cell structure 1 to be compressed to a deformation of 50% is greater than 270N.

The core sleeve 101 comprises an upper sleeve layer a, a lower sleeve layer b, a front sleeve layer c and a rear sleeve layer d, wherein the upper sleeve layer a and the lower sleeve layer b are symmetrically arranged, and the front sleeve layer c and the rear sleeve layer d are symmetrically arranged.

The porosity of the upper jacket layer a is equal to that of the inner core 100, and the porosity of the front jacket layer c is greater than that of the upper jacket layer a. Further improving breathability and providing comfortable support.

Referring to fig. 7, in the thermoplastic elastomer 10 formed by the cushion part (3), the porosity of the upper sheath layer a is smaller than that of the core 100, and the porosity of the front sheath layer c is equal to that of the upper sheath layer a. Further improving breathability and providing comfortable support.

As shown in fig. 8, the thermoplastic elastomer 10 formed by the cushion part (3) includes a rear support 10c, a middle support 10b, and a front support 10a sequentially formed along the length direction thereof, wherein the rear support 10c, the middle support 10b, and the front support 10a have the same thickness.

The rear support 10c, the middle support 10b and the front support 10a are respectively divided into a plurality of support layers z from the thickness direction, and the porosity of each support layer z from bottom to top is gradually increased.

Referring to fig. 9, the supporting layer z is an upper layer, a middle layer and a lower layer (an upper supporting layer z1, a middle supporting layer z2 and a lower supporting layer z 3), and the thickness of the diameter of each supporting layer from bottom to top is gradually increased.

The front support 10a is bent forward and downward; the rear supporter 10c provides a greater elastic support force than the front supporter 10a, and the front supporter 10a provides an elastic support force equal to that of the middle supporter 10 b.

After the elastic resin layer is formed on the front support 10a, the pressure required when the front support is compressed to 50% deformation is greater than 200N.

In addition, the cell configuration of the lattice cell structure constituting the thermoplastic elastomer 10 is not particularly limited.

Meanwhile, the forming process of the headrest portion (1), the back cushion portion (2), the cushion portion (3) and the side supporting portion (4) is the same, and the forming of the cushion portion (3) is taken as an example, and the forming process of the cushion portion (3) comprises the following steps:

1) Thermoplastic Polyurethane (TPU) is used as a raw material, and the elastomer with the lattice structure is printed out by 3D through powder sintering molding, wherein the process parameters are that the main temperature is 100-120 ℃, the laser power is 50W, the scanning speed is 4000-1000mm/s, and the scanning distance is 0.2mm.

2) 94 parts by mass of a commercially available polyurethane resin solution with a mass concentration of 45% and 6 parts by mass of an isocyanate curing agent are uniformly mixed and dispersed by a high-speed stirrer to obtain an impregnation treatment liquid, wherein the polyurethane resin has a hardness of 60A, a viscosity of 8000cP at 25 ℃, a tensile strength of 10MPa and an elongation at break of 200%.

3) Soaking the printed elastomer with the lattice structure in the dipping treatment liquid prepared in the step 2) for 8min, taking out, drying, and then putting into a vacuum oven at 80 +/-2 ℃ for curing for 2.5h to obtain a composite material sample.

The sintered density and porosity of the lattice-structured elastomer obtained at different scanning rates, as well as the weight of the lattice-structured elastomer before and after treatment and the pressure at 50% compression set (average values of the rear, middle and front supports) of the polyurethane resin are shown in table 1 below:

TABLE 1

As can be seen from table 1 above, by controlling the process parameters of 3D printing, the sintering density and porosity of the lattice structure elastomer can be adjusted, and the higher the porosity is, the more the content of the polyurethane resin in the cell structure is, and the more the compression resistance of the composite elastomer material is improved.

Example 3

As shown in fig. 10, the elastic cushion of the present embodiment is a cushion provided on an office chair, and the cushion includes a cushion body B and a backrest body C, both of which have different elastic supporting forces.

The cushion body B and the back body C each include a cell structure 1, and the cell structure 1 includes a thermoplastic elastomer 10 and an elastic resin layer.

The thermoplastic elastomer 10 of the cushion body B comprises a comfort area 1h and a support area 1f which are arranged from top to bottom, the sizes of the cells of the unit cell structures formed by the comfort area 1h and the support area 1f are the same, and the diameters of the cell rods of the unit cell structures formed from bottom to top are gradually reduced.

The thermoplastic elastomer 10 of the backrest body C includes a waist support body 1g and a back support body 1t, wherein the waist support body 1g and the back support body 1t are integrally provided in the upper and lower direction, and form a one-piece backrest cushion 1k.

The cell size of the cell structure formed by the back cushion 1k is the same, and the cell rod diameter of the cell structure formed from back to front is gradually reduced.

The office chair further comprises a headrest pad A formed on the backrest pad 1k, the thermoplastic elastomer 10 of the headrest pad A comprises a support area 1f located in the middle, comfort areas 1h located on both sides of the support area 1f, and the cell size of the unit cell structure gradually increases and/or the cell rod diameter gradually decreases from the middle to both sides.

Meanwhile, the forming processes of the headrest cushion A, the cushion body B and the backrest body C are the same, and the cushion body (2) is formed as an example, and the forming process of the cushion body (2) comprises the following steps:

1) Thermoplastic Polyurethane (TPU) is used as a raw material, and the elastomer with the lattice structure is printed out by 3D through powder sintering molding, wherein the process parameters are that the main temperature is 100-120 ℃, the laser power is 80W, the scanning speed is 8000mm/s, and the scanning distance is 0.2mm;

2) 98 parts by mass of a commercially available acrylic resin solution with the mass concentration of about 55% and 2 parts by mass of a curing agent 4,4' -methylenebis (2-methylcyclohexylamine) are uniformly mixed and dispersed by a high-speed stirrer to obtain an impregnation treatment liquid, wherein the acrylic resin has the hardness of 70A, the viscosity of 10000cP at 25 ℃, the tensile strength of 12MPa and the elongation at break of 180%;

3) Soaking the printed TPU lattice structure elastomer in the dipping treatment liquid for 10min, taking out the TPU lattice structure elastomer, drying the TPU lattice structure elastomer by drying, and then putting the TPU lattice structure elastomer into a vacuum oven at 80 ℃ for curing for 5h to obtain a cell structure sample;

4) And (4) putting the cured sample into the dipping treatment liquid again, soaking for 10min, drying by spinning, and curing.

That is, the cell structure 1 is formed with two elastic resin layers on the surface of the lattice structure elastomer, and at the same time, the weight of the cell structure 1 is increased from 865g before treatment to 1068g, and the compression force at 50% compression set of the material is increased from 270.1N before treatment to 577.3N. The density of the prepared unit cell structure is 1.003g/cm ³ 。

Example 4

As shown in fig. 11, the elastic cushion of the present embodiment is a cushion provided on an office chair (no headrest portion), and the cushion includes a cushion body B and a backrest body C each having different elastic support forces.

Specifically, the thermoplastic elastomer 10 of the cushion body B includes a comfort region 1h and a support region 1f arranged from top to bottom, the cell sizes of the unit cell structures formed by the comfort region 1h and the support region 1f are the same, and the cell rod diameters of the unit cell structures formed from bottom to top gradually decrease.

The thermoplastic elastomer 10 of the backrest body C includes a waist support 1g and a back support 1t, wherein the waist support 1g and the back support 1t are integrally provided in the upper and lower direction, and form a left backrest 1L and a right backrest 1R which are bilaterally symmetrical.

The left backrest 1L includes a support area 1f located in the middle, and comfort areas 1h located on both sides of the support area 1f, and the cell size of the unit cell structure gradually increases and the cell rod diameter gradually decreases from the middle to both sides.

Meanwhile, the forming process of the cushion body B and the backrest body C is the same, and the cushion body (2) is formed as an example, and the forming process of the cushion body (2) comprises the following steps:

4) And (3) putting the cured sample into the dipping treatment liquid again, soaking for 10min, drying by spin, and curing.

That is, in the process of forming the cell structure 1, three elastic resin layers are formed on the surface of the lattice structure elastomer in the formed cell structure 1, and meanwhile, the weight of the cell structure 1 is increased from 924g before treatment to 1136g, and the pressure when the material is compressed and deformed by 50% is increased from 290.1N before treatment to 650.5N. The density of the prepared unit cell structure is 1.099g/cm ³ 。

Example 5

As shown in fig. 12, the elastic pad of the present embodiment is a mattress, which includes a cell structure 1, and the cell structure 1 includes a thermoplastic elastomer 10 and an elastic resin layer.

Specifically, the thermoplastic elastomer 10 has a comfort zone 1h and a support zone 1f with different elastic support forces.

The comfortable area 1h is located above the supporting area 1f, and the cell structures formed by the comfortable area 1h and the supporting area 1f have different cell shapes, and the diameters of the cell rods gradually decrease from bottom to top.

Meanwhile, the mattress forming process comprises the following steps:

3) Soaking the printed TPU lattice structure elastomer in the dipping treatment liquid for 10min, taking out the TPU lattice structure elastomer, drying the TPU lattice structure elastomer by spinning, and then putting the TPU lattice structure elastomer into a vacuum oven at 80 ℃ for curing for 5h to obtain a unit cell structure sample;

That is to say, in the process of forming the cell structure 1, three elastic resin layers are formed on the surface of the lattice structure elastomer in the formed cell structure 1, and meanwhile, the weight of the cell structure 1 is increased from 9200g before processing to 11224g, and the pressure when the material is compressed and deformed by 50% is increased from 450.2N before processing to 990.2N. The density of the prepared unit cell structure is 1.012g/cm ³ 。

Example 6

As shown in fig. 13, the elastic cushion of the present embodiment is a sofa cushion, and the sofa cushion includes a cell structure 1, and the cell structure 1 includes a thermoplastic elastomer 10 and an elastic resin layer.

In this example, the supporting area 1f is located in the middle, and the comfort area 1h is located in the upper and lower parts of the supporting area 1f, wherein the cell configuration of the unit cell structure formed by the comfort area 1h and the supporting area 1f is different, and the cell rod diameter of the unit cell structure located in the middle is larger than that of the unit cell structure located in the upper or lower part.

Meanwhile, the sofa cushion forming process comprises the following steps:

That is, in the cell structure 1 molding process, three elastic resin layers are formed on the surface of the thermoplastic elastomer 10 in the formed cell structure 1, and at the same time, the weight of the cell structure 1 is increased from 4600g before processing to 5300g, and the pressure is increased from 350.5N before processing to 656.3N when the material compression deformation is 50%. The density of the prepared unit cell structure is 1.012g/cm ³ 。

Therefore, the present invention has the following advantages:

1. according to the invention, through the layout of different elastic supporting areas, not only can the required supporting force be provided, but also a formed comfortable area can provide soft and comfortable requirements, and meanwhile, through the design of porosity, the air permeability of the elastic supporting area is ensured, and the sultriness is relieved;

2. according to the composite material, the lattice structure elastomer and the elastic resin coating are compounded, so that the elastic resin permeates into the inner pores of the lattice structure elastomer and is tightly combined with the lattice structure elastomer, unexpectedly, the compression resistance of the material is remarkably improved on the premise that the advantage performance of the lattice structure elastomer is not influenced, the volume of the material is unchanged, and the weight is only slightly increased. Compared with the lattice structure elastomer without the composite elastic resin coating, the lattice structure of the invention has significantly smaller volume and significantly lighter weight when the same compression resistance is achieved; the compression resistance of the unit cell structure of the present application is significantly higher at the same weight.

3. According to the preparation process of the unit cell structure, the 3D printing is adopted to prepare the lattice structure elastomer, and the coating treatment and curing process are adopted, so that on one hand, the sintering density and porosity of the lattice structure elastomer can be controlled by adjusting parameters such as the 3D printing temperature and the laser power, the penetration depth and quality of the elastic resin are further controlled, and finally the degree of improvement of the compression performance of the unit cell structure is controlled, therefore, the unit cell structures with various performances can be flexibly prepared, and the individual requirements under various application scenes can be met. On the other hand, by adopting the coating treatment and the curing process, the combination between the lattice structure elastomer and the elastic resin coating is more sufficient and compact, which is beneficial to improving the strength and the service life of the unit cell structure.

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For numerical ranges, each range between its endpoints and individual point values, and each individual point value can be combined with each other to give one or more new numerical ranges, and such numerical ranges should be construed as specifically disclosed herein.

Claims

1. A lattice structure elastomer characterized by: the lattice structure elastomer is a thermoplastic elastomer forming different elastic supporting areas, the elastic supporting areas are divided into at least a comfort area and a supporting area in an XYZ three-axis coordinate system, and the softness formed by the comfort area is greater than the softness formed by the supporting area.

2. The lattice structured elastomer of claim 1, wherein: an elastic resin layer is formed on the thermoplastic elastomer, the elastic resin layer is formed at least in the internal pores of the thermoplastic elastomer and bonded to the thermoplastic elastomer, and the thermoplastic elastomer and the elastic resin layer constitute a unit cell structure.

3. The lattice structure elastomer of claim 2, wherein: the elastic resin layer is also formed on the outer surface of the lattice structure elastomer; or/and the porosity of the thermoplastic elastomer is 5% -40%; or/and the cell structure requires a pressure of more than 270N when compressed to a deformation of 50%.

4. The lattice structure elastomer according to claim 2 or 3, wherein: the hardness of the elastic resin forming the elastic resin layer is more than 50A Shore hardness and less than 40D Shore hardness, the viscosity at 25 ℃ is less than 12000cP, the tensile strength is more than 5MPa, and the elongation at break is more than 120%.

5. The lattice structured elastomer of claim 4, wherein: the mass of the elastic resin layer is 10% -50% of that of the lattice structure elastomer; and/or the density of the thermoplastic elastomer is 0.7-1.1g/cm ³ 。

6. The lattice structure elastomer according to claim 2 or 3, wherein: the unit cell structure is formed by coating the elastic body with the lattice structure by using a treatment solution containing the elastic resin or raw materials thereof and a curing agent.

7. The lattice structure elastomer of claim 6, wherein: the coating treatment adopts a method of spraying, dip coating or electroplating, and the treatment liquid is made to penetrate into the internal pores of the lattice structure elastomer during the coating treatment.

8. The lattice structured elastomer of claim 7, wherein: the mass concentration of the elastic resin in the treatment liquid is 30 to 60 percent, the mass concentration of the curing agent is 1 to 10 percent, the heating and curing are carried out at the temperature of 80 to 100 ℃, the coating treatment and the heating and curing are carried out once, or after one time, the coating treatment and the heating and curing are repeated for 1~3 times.

9. An elastic cushion based on a lattice structure elastomer, which is characterized in that: the elastic pad includes the lattice-structured elastomer of any one of claims 2 to 8 and the elastic resin layer.

10. The elastic pad made of lattice structure-based elastomer according to claim 9, wherein: the elastic cushion is an office chair cushion or an automobile chair cushion, wherein the office chair cushion comprises a cushion body and a backrest body which have different elastic supporting forces; the automobile seat cushion comprises a headrest part, a cushion part and a cushion part which all have different elastic supporting forces.

11. The elastic pad made of lattice structure-based elastomer according to claim 10, wherein: the cushion body comprises a comfort area and a supporting area which are arranged from top to bottom, the sizes of the cells of the unit cell structures formed in the comfort area and the supporting area are the same, and the diameters of the cell rods of the unit cell structures formed from bottom to top are gradually reduced.

12. The elastic pad made of lattice structure-based elastomer according to claim 10, wherein: the backrest body comprises a waist supporting body and a back supporting body, wherein the waist supporting body and the back supporting body are integrally arranged up and down and form a whole backrest cushion or a left backrest and a right backrest which are symmetrical left and right, the cell sizes of the cell structures formed by the backrest cushion are the same, and the cell rod diameters of the cell structures formed from back to front are gradually reduced; the left backrest comprises a supporting area positioned in the middle and comfort areas positioned on two sides of the supporting area, and the cell sizes of the unit cell structures from the middle to the two sides are gradually increased and the cell rod diameters are gradually decreased.

13. A resilient pad made of an elastomer based on a lattice structure according to claim 12, wherein: the office chair cushion also comprises a headrest cushion formed above the backrest cushion, the headrest cushion comprises a supporting area positioned in the middle and comfort areas positioned on two sides of the supporting area, and the cell sizes of the unit cell structures from the middle to the two sides are gradually increased and/or the cell rod diameters are gradually decreased.

14. The elastic pad made of lattice structure-based elastomer according to claim 10, wherein: the headrest portion includes a support layer and a comfort layer integrally formed from the rear to the front, wherein the comfort layer has a cell size of a cell structure formed by the support layer smaller than a cell size of a cell structure formed by the support layer, and a porosity of the comfort layer is larger than a porosity of the support layer.

15. The elastic pad made of lattice structure-based elastomer according to claim 10, wherein: the back cushion part comprises a waist supporting area and a back supporting area which are arranged up and down, the cell sizes of the unit cell structures of the back supporting area and the waist supporting area are the same, and the cell rod diameters of the unit cell structures formed from back to front of the back supporting area and the waist supporting area are different.

16. The elastic pad made of an elastomer based on a lattice structure according to claim 10, wherein: the cushion part sequentially forms a rear supporting body, a middle supporting body and a front supporting body along the length direction of the cushion part, wherein the thickness formed from back to front is gradually increased, and the porosity formed by the rear supporting body, the middle supporting body and the front supporting body is gradually increased.

17. The elastomeric pad of claim 16, wherein: in a side view projection formed by the end face of the cushion part in the length direction, the front supporting body and the rear supporting body are respectively positioned at the left end and the right end, wherein the right side contour edge of the rear supporting body is continuously bent inwards and outwards from top to bottom; and/or the left side contour edge of the front support body is in fillet transition; and/or the upper side contour edge and the lower side contour edge of the middle support body are symmetrically arranged relative to the middle part, and the upper side contour edge and the lower side contour edge respectively extend obliquely from left to right.

18. The elastic pad made of lattice structure-based elastomer according to claim 10, wherein: the cushion part comprises a front supporting body, a middle supporting body and a rear supporting body which are sequentially formed along the length direction of the cushion part, wherein the thicknesses of the rear supporting body, the middle supporting body and the front supporting body are equal; or/and the rear support body, the middle support body and the front support body are respectively divided into a plurality of supporting layers from the thickness direction, and the diameter of the cell element rod of the unit cell structure formed by each supporting layer from bottom to top is gradually reduced; or/and the porosity of the lattice structure formed from bottom to top is gradually increased.

19. The elastomeric pad of claim 18, wherein: the front support is curved forward and downward; the elastic supporting force formed by the rear supporting body is larger than that formed by the front supporting body, and the elastic supporting force formed by the front supporting body is smaller than or equal to that formed by the middle supporting body.

20. The elastic pad made of lattice structure-based elastomer according to claim 10, wherein: the cushion part comprises a square inner core and a core sleeve formed on the periphery of the inner core, wherein the elastic resin layer is formed on the inner core or/and the core sleeve.

21. A resilient pad made of an elastomer based on a lattice structure according to claim 20, wherein: the core sleeve comprises an upper sleeve layer, a lower sleeve layer, a front sleeve layer and a rear sleeve layer, wherein the upper sleeve layer and the lower sleeve layer are symmetrically arranged, and the front sleeve layer and the rear sleeve layer are symmetrically arranged; or/and the porosity of the upper jacket layer is less than or equal to that of the inner core, and the porosity of the front jacket layer is greater than or equal to that of the upper jacket layer.

22. The elastic pad made of an elastomer based on a lattice structure according to claim 10, wherein: the office chair cushion or the automobile chair cushion also comprises an armrest part, wherein the armrest part comprises a comfort area and a support area which are arranged from top to bottom, and the diameters of the poles of the unit cells of the unit cell structure formed from bottom to top are gradually reduced; or/and the porosity of the lattice structure formed from bottom to top is gradually increased; or/and, the office chair cushion or the automobile chair cushion also comprises side supporting parts formed at two sides of the cushion part, wherein the structure of the side supporting parts is the same as that of the armrest part.

23. The elastic pad made of lattice structure-based elastomer according to claim 10, wherein: the method is characterized in that: the elastic cushion is a sofa cushion or a mattress, the sofa cushion or the mattress comprises a comfort area positioned at the upper part and a support area positioned at the lower part, the cell element shapes of the cell element structures formed by the comfort area and the support area are different, and the diameters of the cell element rods are gradually reduced from bottom to top; or, the sofa cushion or the mattress comprises a supporting area in the middle, and a comfort area in the upper and lower parts of the supporting area, wherein the comfort area and the supporting area form a unit cell structure with different shapes, and the unit cell rod diameter of the unit cell structure in the middle is larger than that of the unit cell structure in the upper or lower part.