CN114763022A - Alternating multilayer foaming material with cork-like performance and moisture absorption function - Google Patents

Alternating multilayer foaming material with cork-like performance and moisture absorption function Download PDF

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Publication number
CN114763022A
CN114763022A CN202110215861.1A CN202110215861A CN114763022A CN 114763022 A CN114763022 A CN 114763022A CN 202110215861 A CN202110215861 A CN 202110215861A CN 114763022 A CN114763022 A CN 114763022A
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China
Prior art keywords
layer
moisture absorption
layers
solid
foam
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Pending
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CN202110215861.1A
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Chinese (zh)
Inventor
浦鸿汀
罗琦
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Enofan Kunshan New Materials Co ltd
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Enofan Kunshan New Materials Co ltd
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Priority to CN202110215861.1A priority Critical patent/CN114763022A/en
Publication of CN114763022A publication Critical patent/CN114763022A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B32B5/20—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material foamed in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
    • B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/60—Measuring, controlling or regulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0221—Vinyl resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/025—Polyolefin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/0278—Polyurethane
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/558—Impact strength, toughness
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/726—Permeability to liquids, absorption

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  • Laminated Bodies (AREA)

Abstract

The invention discloses an alternative multilayer foaming material with mechanical property similar to cork and moisture absorption function and a preparation method thereof. The preparation method comprises the steps of respectively adding the high-hygroscopicity resin material and the thermoplastic resin containing the foaming agent into two extruders to be co-extruded to form a polymer melt, combining the melts in a junction station, cutting the melts through a stacking unit, stacking the melts to form an alternative multilayer structure at one time, and forming the alternately-stacked multilayer elastic high-hygroscopicity material by the thermoplastic resin foaming micro-layer and the hygroscopicity resin micro-layer which are formed by thermal decomposition foaming of the foaming agent in the extrusion and layering processes at one time. The multilayer alternate foaming material has good moisture absorption performance, can be used for a sealing layer or an inner lining layer of a packaging container for food, medicine and the like, and achieves the effects of dehumidification and long-time storage. Meanwhile, the foam layer can provide good elasticity, can recover after being deformed under the action of external force, and has the advantages of simple process, continuous production and high efficiency.

Description

Alternating multilayer foaming material with cork-like performance and moisture absorption function
Technical Field
The invention relates to the technical field of polymer processing and moisture absorption materials, in particular to a multilayer elastic high moisture absorption material and a preparation method thereof.
Background
The moisture absorption resin is a functional material which can absorb water vapor in the environment and has the effect of reducing the environmental humidity, and is commonly used in the field of food, medicine and other articles with strict requirements on the environmental humidity. However, since a large amount of inorganic filler which has a moisture absorption function is often added into the high moisture absorption resin, the high moisture absorption resin has poor mechanical properties and is very easy to break and lose efficacy when compressed and impacted by external force.
The foamed plastic has the functions of light weight, shock absorption, sound insulation, heat insulation and the like, so that the foamed plastic is widely applied to the fields of aerospace, buildings, packaging materials, transportation and the like. However, when the conventional foam plastic is used as a packaging material, the foam plastic is difficult to be directly and tightly combined with a protected material, the foam plastic and the protected material need to be bonded together through a subsequent process, and the process is tedious, time-consuming and high in cost.
Disclosure of Invention
In view of the defects in the prior art, the invention aims to provide a multi-layer elastic high moisture absorption material with solid layers and foam layers alternately arranged.
Another object of the present invention is to provide a method for continuously and efficiently producing a multi-layer elastic superabsorbent material.
In order to achieve the above purposes, the technical scheme adopted by the invention is as follows: a multilayer alternate foaming material with solid layers and foam layers alternately arranged is disclosed, wherein the solid layers are made of high-hygroscopicity resin materials, and the foam layers are formed by foaming thermoplastic elastomers.
The high-hygroscopicity resin material used by the solid layer material is thermoplastic high-molecular resin or organic/inorganic composite high-molecular resin with a moisture-absorption function, the foaming layer material is one or more blended polymers of Thermoplastic Polyurethane (TPU), polyolefin thermoplastic elastomer (POE), ethylene-vinyl acetate copolymer (EVA), styrene-butadiene-styrene block copolymer (SBS), low-density polyethylene and high-density polyethylene, and the foaming agent is a thermal decomposition type foaming agent.
The processing temperature of the solid layer is 100-250 ℃, the processing temperature of the thermoplastic elastomer is 100-250 ℃, and the temperature for the thermal decomposition of the foaming agent is 100-250 ℃.
A process for preparing multi-layer elastic high-hydroscopic material includes
And respectively adding the solid layer material and the thermoplastic elastomer material uniformly mixed with the foaming agent into two extruders, converging by a junction station, cutting by a superposition unit, and superposing in layers, wherein the foaming agent is heated and decomposed in the extrusion process to directly obtain the multilayer alternating foaming material.
The invention has the beneficial effects that:
1. according to the invention, the solid layers and the foam layers are alternately arranged, and the high-efficiency moisture absorption resin layer in the solid layers has a good absorption effect on water vapor in the environment due to the doping of a large amount of moisture absorption inorganic filler.
2. When the material is impacted or compressed by external force when the multi-layer elastic high-moisture-absorption material disclosed by the invention is impacted by the external force, bubbles among foam layers play a role similar to a spring, and the energy is lost through the processes of compression and recovery of the bubbles, so that the effects of buffering and damping are achieved.
3. According to the multilayer elastic high-moisture-absorption material disclosed by the invention, the solid moisture absorption layers are separated by the foam layers, so that the speed of the material reaching moisture absorption balance can be effectively reduced, the moisture absorption time of the material is prolonged, and the material is prevented from losing efficacy after rapidly reaching moisture absorption balance.
4. The invention discloses a preparation method of a multilayer alternating foaming material, which comprises the steps of respectively adding a solid layer material and a thermoplastic elastomer material uniformly mixed with a foaming agent into two extruders, converging the materials by a junction station, cutting the materials by a superposition unit, superposing the materials in a layering manner, and directly obtaining the multilayer alternating foaming material by heating and decomposing the foaming agent in the extrusion process. Compared with an intermittent preparation method, the preparation method has the advantages of simplicity, high efficiency and continuous production.
Drawings
Fig. 1 is a schematic structural view of a multi-layer elastic high-moisture-absorption material.
Fig. 2 is an optical microscope photograph of a slice of the multilayer elastic high moisture absorbent material of 8 layers prepared in example 1 in the thickness direction.
Fig. 3 is an optical microscope photograph of a slice of the 16-layer elastic superabsorbent material prepared in example 2 in the thickness direction.
Fig. 4 is an optical microscope photograph of a thickness-direction slice of the 32-layer elastic high moisture absorbent material prepared in example 3.
Table 1 shows the moisture absorption rate of samples of examples 1, 3 and 4 and comparative example at 23 ℃ and 75% relative humidity as a function of time.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the accompanying drawings, wherein the reagents and instruments are commercially available, and the reagents and instruments are not indicated by the type of the reagents or instruments used in the embodiments.
Example 1
The processing equipment adopted in the embodiment comprises two extruders, a junction station, a 2-nested heating unit, a temperature control heating system, an extrusion die and a traction collecting device. The thermoplastic elastomer, the thermal decomposition type foaming agent, the foaming auxiliary agent and the like are firstly uniformly stirred in a high-speed stirrer, then are added into a double-screw extruder, the rotating speed is controlled to be 5-20 r/min, the temperature is controlled to be 120-180 ℃, the mixture is uniformly mixed and then extruded, and the mixture is cut into granules by a cutter. Then, the high-hygroscopicity resin material and the thermoplastic elastomer granules uniformly mixed with the foaming agent are respectively added into two extruders. The cylinder temperature of the extruder for the high-hygroscopicity resin material is set to be 120-240 ℃, the cylinder temperature of the extruder for the thermoplastic elastomer is set to be 100-220 ℃, the system temperature of the junction station and the superposition unit is set to be 150-240 ℃, the temperature of the extrusion die is set to be 150-240 ℃, and the rotating speed of the two extruders is set to be 5-40r/min, so that the feeding capacity of the two extruders is ensured to be the same. A multi-layer elastic high moisture absorbent material having 8 layers of a solid layer of a high moisture absorbent resin material and foamed layers of a thermoplastic elastomer alternately arranged was obtained by the processing system.
Example 2
The present embodiment is different from embodiment 1 in the number of superimposing units. In this example, a multilayer elastic high-moisture-absorption material comprising 16 solid layers of high-moisture-absorption resin material and thermoplastic elastomer foam layers arranged alternately is finally extruded by using 3 nested unit.
Example 3
The present embodiment is different from embodiment 1 in the number of superimposing units. In this example, a multilayer elastic high-moisture-absorption material comprising 32 solid layers of a high-moisture-absorption resin material and foamed layers of a thermoplastic elastomer alternately arranged is finally extruded by using 4 nested unit.
Example 4
This example differs from example 3 in the solid layer and foam layer content. Solid layer in this example: the volume ratio of the foam layer is 2: 1, the final extrusion is a multilayer elastic high moisture absorption material with 32 layers of high moisture absorption resin material solid layers and thermoplastic elastomer foaming layers which are alternately arranged.
Comparative example
The high hygroscopic resin material and the untreated thermoplastic elastomer were fed into two extruders, respectively. The cylinder temperature of the extruder for the high-hygroscopicity resin material is set to be 120-240 ℃, the cylinder temperature of the extruder for the thermoplastic elastomer is set to be 100-220 ℃, the system temperature of the junction station and the superposition unit is set to be 150-240 ℃, the temperature of the extrusion die is set to be 150-240 ℃, and the rotating speed of the two extruders is set to be 5-40r/min, so that the feeding capacity of the two extruders is ensured to be the same. A multi-layer unfoamed control sample in which 8 unfoamed solid layers of a highly hygroscopic resin material and 8 solid layers of a thermoplastic elastomer were alternately arranged was obtained by this processing system.
Effect analysis
The multilayer alternative foams of examples 1 to 3 were sliced in the thickness direction and observed by an optical microscope, and the results are shown in FIGS. 2 to 4. The multi-layered alternate foam materials prepared in the comparative example and examples 1, 3 and 4 were subjected to moisture absorption property test, and the results are shown in table 1.
As can be seen from the optical microscope photographs shown in FIGS. 2 to 4, the thermoplastic elastomer foam layers and the solid layers in the multilayer alternative foam materials of examples 1 to 3 are clearly layered, the direct interface bonding property between the layers is good, the sizes of the bubbles are uniform, and the sizes of the bubbles are gradually reduced with the increase of the number of the layers, and the cell structures are closed-cell bubbles. As can be seen from the moisture absorption performance data in Table 1, the unit mass moisture absorption rate of the multi-layer alternate foaming material is improved compared with that of the multi-layer unfoamed material, the moisture absorption rate is reduced when the number of layers is larger, and the situation that moisture absorption is too fast and moisture absorption is achieved is avoided. After reaching the moisture absorption equilibrium for a longer time, the moisture absorption rates of the multilayer materials are basically the same.
The present invention is not limited to the above preferred embodiments, and any other various products can be obtained by anyone in light of the present invention, but any changes in shape or structure thereof, which are similar or equivalent to the technical solution of the present invention, are within the protection scope.
Table 1 shows the change of moisture absorption rate with time for examples 1, 3 and 4 and comparative example
1 day (%) 3 days (%) 7 days (%) 15 days (%) 30 days
Comparative example 5.46 9.72 10.13 11.29 11.28
Example 1 6.32 10.24 10.58 13.52 13.56
Example 3 4.97 8.11 9.76 13.41 13.50
Example 4 5.42 8.79 10.03 15.93 16.04

Claims (10)

1. A multilayer elastic high moisture absorption material with solid layers and foam layers arranged alternately is characterized in that: the solid layer is made of high-hygroscopicity resin material, and the foam layer is formed by foaming one or more thermoplastic elastomers.
2. The material of claim 1, wherein the solid and foam layers are alternately arranged to form a multi-layer resilient high moisture absorption material, wherein: the solid layer is made of thermoplastic polymer resin or organic/inorganic composite polymer resin with moisture absorption function, and the moisture absorption rate of the moisture absorption material with unit mass under the equilibrium condition is 5-30%; the foam layer is formed by mixing and foaming one or more polymers of Thermoplastic Polyurethane (TPU), polyolefin thermoplastic elastomer (POE), ethylene-vinyl acetate copolymer (EVA), styrene-butadiene-styrene block copolymer (SBS), low-density polyethylene and high-density polyethylene, and the foaming agent is a thermal decomposition type foaming agent.
3. The material of claim 2, wherein the solid layers and the foam layers are alternately arranged to form a multi-layer elastic high moisture absorption material, and the material comprises: the melt index of the solid layer material is 0.1-15 g/min; the foam layer material has a melt index of 0.1-15 g/min.
4. The material of claim 2, wherein the solid layers and the foam layers are alternately arranged to form a multi-layer elastic high moisture absorption material, and the material comprises: the number of the layers of the multilayer alternating foaming material is 4, 8, 16, 32, 64, 128 and 256.
5. The material of claim 2, wherein the solid layers and the foam layers are alternately arranged to form a multi-layer elastic high moisture absorption material, and the material comprises: the mass ratio of the thermal decomposition type foaming agent to the thermoplastic elastomer is 0.01-10:100, and the volume ratio of the solid layer material to the foam layer material is 10:90-90: 10.
6. A process for the preparation of a multilayer elastic superabsorbent material of any of claims 1 to 5 wherein: the method comprises the following steps: and respectively adding the solid layer material and the thermoplastic elastomer material uniformly mixed with the foaming agent into two extruders, converging by a junction station, cutting by a superposition unit, layering and superposing, and directly obtaining the multilayer alternating foaming material by heating and decomposing the foaming agent in the extrusion process.
7. The method for preparing the multilayer elastic high moisture absorption material with the alternating arrangement of the solid layer and the foam layer according to claim 6, is characterized in that: the processing temperature of the solid layer is 100-250 ℃, the processing temperature of the thermoplastic elastomer is 100-250 ℃, and the temperature for thermal decomposition of the foaming agent is 100-250 ℃.
8. The material of claim 1, wherein the solid and foam layers are alternately arranged to form a multi-layer resilient high moisture absorption material, wherein: the solid layer material and the foaming layer material have certain compatibility, the interface bonding force is strong, and the layers are not easy to slip or separate when compressed or stretched by an external force.
9. The multilayer elastic high moisture absorption material with the alternating solid layers and the foam layers as claimed in claim 1, wherein: the solid layer material has good moisture absorption performance, the moisture absorption rate of the moisture absorption material per unit mass under a balanced condition is 5% -30%, and the elastic foam layer material has good elasticity and toughness and can recover after being compressed under the action of an external force.
10. The multilayer elastic high moisture absorption material with the alternating solid layers and the foam layers as claimed in claim 1, wherein: when compressed or impacted by external force, the foam layer can perform compressible deformation and restorable actions, the elasticity of the material is kept, and meanwhile, the foam layer generates energy loss through the compression and restorable processes of the foam layer, so that a damping and buffering effect is achieved; the solid layer has the function of efficiently absorbing water vapor in the environment, and can be used for dehumidifying and storing food and medicines for a long time.
CN202110215861.1A 2021-02-26 2021-02-26 Alternating multilayer foaming material with cork-like performance and moisture absorption function Pending CN114763022A (en)

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CN202110215861.1A CN114763022A (en) 2021-02-26 2021-02-26 Alternating multilayer foaming material with cork-like performance and moisture absorption function

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Application Number Priority Date Filing Date Title
CN202110215861.1A CN114763022A (en) 2021-02-26 2021-02-26 Alternating multilayer foaming material with cork-like performance and moisture absorption function

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CN114763022A true CN114763022A (en) 2022-07-19

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6326551B1 (en) * 1997-08-14 2001-12-04 Commscope Properties, Llc Moisture-absorbing coaxial cable and method of making same
JP2005238760A (en) * 2004-02-27 2005-09-08 Shin Etsu Polymer Co Ltd Hygroscopic packing material
CN109664562A (en) * 2017-10-13 2019-04-23 苏州上品嘉新材料科技有限公司 Polymer-based multilayer foamed composite damping material of one kind and preparation method thereof
CN110216958A (en) * 2019-05-24 2019-09-10 华南理工大学 A kind of resistance to multi-layer foam material as well and preparation method thereof for drawing pressure resistance of lower thermal conductivity

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6326551B1 (en) * 1997-08-14 2001-12-04 Commscope Properties, Llc Moisture-absorbing coaxial cable and method of making same
JP2005238760A (en) * 2004-02-27 2005-09-08 Shin Etsu Polymer Co Ltd Hygroscopic packing material
CN109664562A (en) * 2017-10-13 2019-04-23 苏州上品嘉新材料科技有限公司 Polymer-based multilayer foamed composite damping material of one kind and preparation method thereof
CN110216958A (en) * 2019-05-24 2019-09-10 华南理工大学 A kind of resistance to multi-layer foam material as well and preparation method thereof for drawing pressure resistance of lower thermal conductivity

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