3d air fiber material for low pressure variable seating and method of making

Abstract

The application discloses a 3D air fiber material for a low-pressure variable seat, which is prepared from the following components in parts by weight: TPEE resin 94.9-96.7 parts, composite crosslinking agent 0.5-1.0 parts, composite antioxidant 0.3-0.8 parts, composite lubricant 0.5-1.2 parts, and foaming agent master batch 2-5 parts. The air fiber material prepared by the application can reduce the compression deformation rate of the seat during use, improve the air permeability, and increase the comfort of the seat.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high molecular materials, in particular to a 3D air fiber material for low-pressure variable seat and a preparation method thereof. BACKGROUND

[0002] Thermoplastic polyester elastomer (TPEE) belongs to a kind of thermoplastic elastomer with excellent comprehensive performance, with the advantages of high mechanical strength, good elasticity, impact resistance, creep resistance, cold resistance, bending fatigue resistance, oil resistance, chemical corrosion resistance and solvent erosion, etc.Compared with rubber, it has better processing performance and longer service life; compared with engineering plastics, it also has the characteristics of high strength, and better flexibility and dynamic mechanical properties.

[0003] At present, most of the automobile seats on the market are made of foamed polyurethane. However, the foamed polyurethane product has the shortcomings of hard feeling in the initial compression, lack of air permeability, poor resilience after long-term compression, and easy yellowing after long-term use.

[0004] If the ordinary TPEE material (i.e. using conventional material to synthesize PBT as hard segment and polytetrahydrofuran ether as soft segment) is directly used to make the cushion of the automobile seat, the compression ratio of the cushion is usually about 14%, and the comfort and safety are not good enough. SUMMARY

[0005] Therefore, the present application provides a 3D air fiber material for low-pressure variable seat and a preparation method thereof to solve the problems in the background art, reduce the compression deformation rate of the seat during use, improve the air permeability, and increase the comfort of the seat.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] In one aspect, the present application discloses a 3D air fiber material for low-pressure variable seat, which is prepared from the following components in parts by weight:

[0008]

[0009]

[0010] As a further scheme of the present application, the hardness of the TPEE resin is 50-60HD, and the melting point is 160-170℃. The hardness range of the TPEE resin has better supporting effect and comfort for human body.

[0011] As a further scheme of the present application, the composite crosslinking agent is at least one of a trifunctional or more epoxy compound and a trifunctional or more isocyanate compound.

[0012] As a further scheme of the present application, the composite antioxidant is composed of a free radical scavenger, a peroxide decomposer and a formaldehyde scavenger.

[0013] As a further scheme of the present application, the composite lubricant is a compound of polyether wax and polyamide wax.

[0014] As a further scheme of the present application, the foaming agent master batch is prepared from a TPEE resin matrix, a foaming agent, an antioxidant, zinc oxide in a mass ratio of 100:50:0.5:0.5.

[0015] Another aspect of the present application discloses a preparation method of a 3D air fiber material for a low-pressure variable seat according to any one of the above, comprising the following steps:

[0016] S1: dry TPEE resin, composite crosslinking agent, composite antioxidant, composite lubricant and foaming agent master batch are weighed by weight parts, and then mixed to obtain a mixture;

[0017] S2: the mixture is added into a double screw extruder to obtain a 3D air fiber material through melting and extrusion.

[0018] 8. The preparation method of claim 7, wherein the barrel temperature of the double screw extruder is 180℃, the screw rotation speed is 150r / min, and the vacuum degree is -0.08MPa.

[0019] Compared with the prior art, the present application has the following advantages:

[0020] The present application forms a spatial three-dimensional network structure by adding a composite crosslinking agent, which is beneficial to improve the compression resistance and air permeability, and provides a favorable micro-foaming environment for the micro-foaming melt. The material can obtain a multi-dimensional network space through micro-foaming, thereby further improving the compression resistance. The better composite antioxidant can reduce the aging degradation of the 3D fiber material during processing, and increase the service life of the material. The addition of the composite lubricant is beneficial to the smoothness of the material, and the noise of the made cushion is obviously reduced when it is squeezed, and the comfort is increased.

[0021] The joint addition of the composite crosslinking agent and the foaming master batch can make the micro-pores of the spatial three-dimensional network structure more uniform and dense while ensuring the melt strength of the material, and reduce the micro-pore rupture.

[0022] The thermoplastic polyester elastomer generates free radicals under high temperature in air, which reduces the viscosity of the polymer, the alpha carbon atom connected with the polyether oxygen atom in the polymer chain is attacked, thus forming peroxide, and the chain scission generates formaldehyde, which in turn promotes chain scission. The addition of the compounded antioxidant can reduce the attack of free radicals by the free radical scavenger, reduce the chain scission of peroxide to generate formaldehyde by the peroxide decomposer, and reduce the content of formaldehyde by adding a formaldehyde scavenger to interrupt the chain reaction of further chain scission. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present application, the present application will be described more fully below with specific embodiments. However, the present application can be realized in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application herein are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0025] The specific information of the raw materials used in the following examples and comparative examples is as follows:

[0026] Component A: TPEE resin, Shore hardness 55D;

[0027] The preparation method is as follows:

[0028] In a 50 liter polymerization reactor, dimethyl terephthalate 8.55 kg, dimethyl isophthalate 0.45 kg, 1,4-butanediol 7 kg, antioxidant 122.5 g, catalyst tetrabutyl titanate 50 g, anti-yellowing agent 100 g, heat stabilizer 125 g, and catalyst promoter 50 g are added. The ester exchange temperature is set to 200°C, and the ester exchange reaction is carried out under nitrogen protection. When the ester exchange is 30-90 minutes and the methanol reaches 2650 ml or more, polyether polyol (number average molecular weight 2000) 6 kg and polyester polyol (number average molecular weight 2000) 2 kg are added, and the reaction kettle is heated to 250°C, and the vacuum degree is reduced to 1 mmHg or less. Under this condition, the polycondensation is carried out for 60-120 minutes, and the thermoplastic polyester elastomer with the required intrinsic viscosity is prepared according to the change of the stirring current of the polymerization kettle.

[0029] Component B: composite crosslinking agent, which is uniformly mixed by 30 parts of B1 and 70 parts of B2:

[0030] B1: isocyanuric acid triglycidyl ester, purchased from Yangzhou Suntory Chemical Co., Ltd.

[0031] B2: Trimeric hexamethylene diisocyanate, available from Wanhua Chemical Group Co., Ltd.

[0032] Component C: Complex antioxidant, which is prepared by mixing 50 parts of C1, 25 parts of C2 and 25 parts of C3 uniformly.

[0033] C1: Free radical scavenger: 4, 4'-bis (a, a-dimethylbenzyl) diphenylamine, brand Naugard N445, available from Kao Poly-Ay Co., Ltd.

[0034] C2: Peroxide decomposer: pentaerythritol dodecylthiopropyl ester, brand 412S, available from Kao Poly-Ay Co., Ltd.

[0035] C3: Formaldehyde scavenger: dialkyl dithiocarbamate, brand POUPC4002, available from Pacific Union (Beijing) Petroleum Chemical Co., Ltd.

[0036] Component D: Complex lubricant, which is prepared by mixing 40 parts of D1 and 60 parts of D2 uniformly.

[0037] D1: Polyether wax, brand Luwax V, available from BASF;

[0038] D2: Polyamide wax, brand NEW-0401C, available from Nanjing Tianshi New Material Technology Co., Ltd.

[0039] Component E: Foaming agent master batch

[0040] The preparation method is as follows:

[0041] After mixing 100 parts of component A, 50 parts of azodicarbonamide (foaming agent), 0.5 parts of Irganox 1010 antioxidant and 0.5 parts of zinc oxide (foaming catalyst), granulation is carried out in a single screw machine, and the granulation temperature is 180°C.

[0042] All materials are commercially available conventional products.

[0043] Examples 1-3 and Comparative Examples 1-6 are prepared by the following preparation method to obtain 3D air fiber materials:

[0044] According to the proportion in Table 1, each component is weighed and added to a mixer for mixing for 10-15 minutes to obtain a mixture;

[0045] The mixture is added to the main feeding port of a double screw extruder, and the temperature of the several barrels is set to 180°C, the screw rotation speed is 150 r / min, and the vacuum degree is-0.08 MPa. After melting and extrusion, the 3D air fiber material is obtained.

[0046] Table 1 ​

[0047]

[0048]

[0049] The obtained 3D air fiber material is spun through a spinning plate (spinning temperature is 230℃), and after cooling and setting, an air fiber block with a length of 100mm, a width of 100mm, and a height of 100mm is prepared, and a compression deformation performance test is performed: the height of the air fiber block is compressed to 50% and placed in an oven at 70℃ for 22 hours, then the air fiber block is taken out, the pressure is released and freely recovered, and then placed in a room temperature environment at 23℃ for 24 hours, and the compression deformation rate is tested, and in the compression process, whether there is an abnormal sound is perceived, and the results are shown in Table 2.

[0050] Table 2

[0051]

[0052] Note: The air fiber block compression abnormal sound in Table 2 is evaluated by 1-3, 1 represents no abnormal sound, 2 represents general abnormal sound, and 3 represents serious abnormal sound.

[0053] From Table 2, it can be seen that: compared with Example 3, Comparative Example 1 does not add foaming master batch, and does not form a micro-foaming structure, so it cannot form a multi-dimensional micro-porous space and cannot improve the compression deformation performance; compared with Example 3, Comparative Example 2 does not add a composite lubricant, which causes the 3D fiber block to produce an abnormal sound during compression; compared with Example 3, Comparative Example 3 does not add a composite antioxidant, which causes aging degradation during the processing of the 3D fiber block, thereby affecting the low compression deformation performance; in Comparative Example 4, the lack of a composite crosslinking agent causes insufficient melt strength during micro-foaming, uneven cell rupture during foaming, and the inability to form a complete micro-foaming structure, resulting in the worst low compression deformation performance; in Comparative Example 5, the lack of a crosslinking agent and foaming master batch does not have good melt strength and micro-porous structure, and the compression deformation is high.

[0054] It can be known from the present application that by adding a crosslinking agent, a composite antioxidant, a composite lubricant, and a foaming master batch to the synthesized low-melting-point TPEE, a micro-crosslinked and micro-foamed 3D air fiber is formed during processing, which greatly improves the compression deformation performance, and completely meets the requirements of high safety and comfort of 3D air fiber materials for automobile seat cushions and backrests.

[0055] It can be understood that the above raw materials and reagents are only examples of some specific embodiments of the present application, so that the technical solutions of the present application are more clear, and do not represent that the present application can only use the above reagents, and the specific scope is subject to the scope of the claims. In addition, the "parts" in the examples and comparative examples refer to weight parts, unless otherwise specified.

[0056] Any range recited in the present invention includes the end values and any intervening value and any sub-range comprised of any stated or intervening value.

[0057] Although the present specification describes particular embodiments, each of which contains only a single independent technical solution, the specification is written so as to cover all combinations of described features as would be understood by one of ordinary skill in the art. Each embodiment describes only one independent technical solution, but a person of ordinary skill in the art would understand that features of one embodiment can typically be combined with features of another embodiment.

[0058] The above description is merely illustrative of the application and is not intended to limit the scope of the application. Rather, the scope of the application is defined by the appended claims.

Claims

1. A 3D air fiber material for low-pressure variable seating, characterized in that, It is prepared from the following components in parts by weight: TPEE resin 94.9–96.7 parts 0.5-1.0 parts of composite crosslinking agent Compound antioxidant 0.3-0.8 parts, 0.5–1.2 parts of compound lubricant 2-5 parts of foaming agent masterbatch; The composite crosslinking agent is composed of triglycidyl isocyanurate and trihexamethylene diisocyanate in a mass ratio of 3:7; The composite antioxidant is composed of 4,4'-bis(α,α-dimethylbenzyl)diphenylamine, pentaerythritol dodecyl propyl ester, and dialkyl dithiocarbamate in a mass ratio of 2:1:

1.

2. The 3D air fiber material for low-pressure variable seats according to claim 1, characterized in that, The TPEE resin has a hardness of 50-60HD and a melting point of 160-170℃.

3. The 3D air fiber material for low-pressure variable seats according to claim 1, characterized in that, The composite antioxidant is composed of a free radical scavenger, a peroxide decomposer, and a formaldehyde scavenger.

4. The 3D air fiber material for low-pressure variable seating according to claim 1, characterized in that, The composite lubricant is a mixture of polyether wax and polyamide wax.

5. The 3D air fiber material for low-pressure variable seats according to claim 1, characterized in that, The foaming agent masterbatch is prepared from TPEE resin matrix, foaming agent, antioxidant and zinc oxide in a mass ratio of 100:50:0.5:0.

5.

6. A method for preparing a 3D air fiber material for low-pressure variable seating as described in any one of claims 1-5, characterized in that, Includes the following steps: S1: Weigh the dried TPEE resin, composite crosslinking agent, composite antioxidant, composite lubricant, and foaming agent masterbatch according to the weight parts, mix them thoroughly, and obtain the mixture. S2: The mixture is added to a twin-screw extruder and melted and extruded to obtain a 3D air fiber material.

7. The preparation method according to claim 6, characterized in that, The twin-screw extruder has a barrel temperature of 180℃, a screw speed of 150 r / min, and a vacuum degree of -0.08 MPa.

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