CN108342023B - Waterproof polyolefin foam material, and preparation method and application thereof - Google Patents
Waterproof polyolefin foam material, and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a waterproof polyolefin foam material, a preparation method and application thereof, belonging to the field of waterproof polyolefin foam materials, wherein the waterproof polyolefin foam material comprises the following components in parts by weight: 100 parts of ethylene propylene diene monomer, 15-25 parts of ethylene-vinyl acetate copolymer, 30-40 parts of ethylene-octene copolymer, 1-3 parts of organic silicon elastomer and 4-6 parts of foaming agent, wherein the organic silicon elastomer is a mixture of polydimethylsiloxane cross-linked copolymer and cyclomethicone. The invention also provides a method for preparing the waterproof polyolefin foamed sheet. According to the invention, through the design of components and structure, the foam pores of the polyolefin foam material have high pore-closing property, so that the polyolefin foam material has excellent waterproof performance and can meet the increasingly high requirement of electronic products on waterproof performance.
Description
Technical Field
The invention belongs to the field of waterproof polyolefin foam materials, and particularly relates to a waterproof polyolefin foam material, and a preparation method and application thereof.
Background
The irradiation crosslinked polyolefin foam material has good comprehensive performance. The composite material has the advantages of good additional properties of heat insulation, water resistance, shock absorption, sound insulation and the like, good post-processing treatment performance, weather resistance, aging resistance, no toxicity and no harm, and belongs to an environment-friendly new material.
For most electronic products, especially mobile phones, the requirement for waterproofing is very high, waterproofing becomes a standard in the aspect of mobile phones, and many mobile phone manufacturers make many requirements for waterproofing materials in order to be able to occupy market share.
For common foaming materials, high waterproof performance cannot be achieved, and in the face of higher waterproof requirements, a novel polyolefin foaming material with excellent waterproof performance needs to be developed.
Disclosure of Invention
Aiming at the defects or improvement requirements of the prior art, the invention provides a waterproof polyolefin foam material, a preparation method and application thereof, and aims to ensure that the foam pores of the polyolefin foam material have high pore-closing property through the design of components and structure, so that the waterproof polyolefin foam material has excellent waterproof performance, and meanwhile, the processing is simple and environment-friendly, and the production operation is more stable.
In order to achieve the above object, according to one aspect of the present invention, there is provided a waterproof polyolefin foam material, comprising the following components in parts by weight:
100 parts of Ethylene Propylene Diene Monomer (EPDM),
15-25 parts of ethylene-vinyl acetate copolymer (EVA),
30-40 parts of ethylene-octene copolymer (POE),
1-3 parts of organic silicon elastomer,
4 to 6 parts of a foaming agent,
the silicone elastomer is a mixture of a polydimethylsiloxane cross-linked copolymer and cyclomethicone, and the mass ratio of the polydimethylsiloxane cross-linked copolymer to the cyclomethicone is 1: 2-1: 1.
Further, it is in the form of a sheet having a thickness of not more than 10mm and having closed cells in a unit area in an amount larger than that of open cells. The closed cell rate is 95-100%, and the average diameter of the cells is 50-100 μm.
Furthermore, the waterproof performance of the waterproof paint reaches the IPX7 level.
Further, the surface of the coating is coated with a waterproof acrylic coating.
Furthermore, the oil filling rate of the ethylene propylene diene monomer rubber is 30-50%.
Further, the content of ethylene-vinyl acetate copolymer VA (the name of VA is vinyl acetate) is 18% -22%.
Further, the foaming material further comprises the following components in parts by weight: 0.1-2 parts of antioxidant, 0.2-5 parts of lubricant, 0.1-3 parts of sensitizer and 2-10 parts of filler.
According to a second aspect of the present invention, there is also provided a method for preparing the waterproof polyolefin foam material as described above, comprising the steps of:
s1: weighing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer and ethylene-octene copolymer according to set proportions of 100 parts, 15-25 parts and 30-40 parts by weight, uniformly mixing for 5-10 minutes, and then extruding and granulating to obtain elastomer modified resin master batches;
s2: sequentially pouring the elastomer modified resin master batch, the sensitizer, the organic silicon elastomer and the lubricant into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 +/-5 ℃, the internal mixing time is 6-8 minutes, and then carrying out melt plasticizing granulation to obtain a sensitized master batch;
s3: pouring the elastomer modified resin master batch, the foaming agent, the filler, the lubricant and the organic silicon elastomer into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 +/-5 ℃, the internal mixing time is 6-8 minutes, and then carrying out melt plasticizing granulation to obtain a foaming master batch;
s4: mixing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer, ethylene-octene copolymer, sensitized master batch and foaming master batch for 2-6 minutes, and then discharging into an extruder to extrude into a foaming body substrate;
s5: performing electron irradiation crosslinking on the foaming body substrate, wherein the electron energy of the irradiation crosslinking is 0.1MeV-4.0MeV, and the irradiation dose is 3 Mrad-50 Mrad, so as to obtain a foaming body master slice;
s6: the foam mother sheet is subjected to free-form foaming to obtain a foamed sheet. Further, the method further includes step S7, where S7 is: and coating an acrylic waterproof coating on the surface of the foaming sheet.
According to a third aspect of the present invention, there is also provided a use of the waterproof polyolefin foam material as described above in an electronic product.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
the invention provides a waterproof polyolefin foam material, the waterproof grade of which is to reach the IPX 7-grade waterproof standard. The IPX 7-grade waterproof standard is specifically that the foam material is applied to electronic products according to the JIS waterproof grade of the Japanese industrial standard, and reaches the IPX 7-grade waterproof standard. The concrete content is that the water can not enter the interior of the water bath after being immersed in the water within 30 min. The existing waterproof polyolefin foam material is IPX6 grade in waterproof grade, and the existing waterproof polyolefin foam material can not enter the interior for a short time even being directly sprayed by water in any direction. The waterproof performance of the polyolefin foam material is obviously superior to that of the existing polyolefin foam material.
Specifically, the inner holes in the foamed polyolefin foam are prepared into closed holes with high height through controlling components and processes, wherein the closed holes with high height mean that the number of the completely closed micro holes is far greater than the number of the completely closed micro holes by average statistics. And for the irradiation crosslinking foaming material, the high closed-cell foam structure can well play a role in waterproofing. In addition, the foamed polyolefin provided by the invention can play a good waterproof role by adding the thermoplastic elastomer, the elastomer resin is a hydrophobic material, and after foaming, the specific closed cell structure can play a better waterproof role; simultaneously, the added EPDM is filled with oil, so that further prevention is made for water resistance. In addition, the organosilicon elastomer is added, so that the compatibility of resin and powder can be promoted, and meanwhile, the organosilicon elastomer contains silicon which is used as a hydrophobic material and has a certain waterproof effect. In addition, a layer of acrylic resin is finally coated on the surface of the foam, so that the waterproof capability of the foam is further improved.
Drawings
FIG. 1 is a flow chart of the preparation method of the waterproof polyolefin foam material of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The waterproof polyolefin foam material is in a sheet shape, the thickness of a sheet layer is not more than 10mm, and the number of closed pores is larger than that of open pores in unit area. The closed-cell rate is 95-100%, the pores in the structure are fine, the average diameter of the pores is 50-100 μm, and the surface of the flaky foamed sheet is coated with a layer of acrylic waterproof coating. The composition comprises the following components in parts by weight:
100 parts of Ethylene Propylene Diene Monomer (EPDM), 15-25 parts of ethylene-vinyl acetate copolymer (EVA), 30-40 parts of ethylene-octene copolymer (POE), 1-3 parts of organic silicon elastomer and 4-6 parts of foaming agent, wherein the organic silicon elastomer is a mixture of polydimethylsiloxane cross-linked copolymer and cyclomethicone. The oil filling rate of the ethylene propylene diene monomer is 30-50%. The ethylene-vinyl acetate copolymer VA (the name of VA is vinyl acetate) content is 18% -22%. Wherein, the selection of each component and the content are combined together, which produces unique technical effect and leads the waterproof performance to reach IPX7 level.
Specifically, 15-25 parts of ethylene-vinyl acetate copolymer (EVA) is selected, along with the increase of the EVA content, the 25% compression strength is reduced, the compression ratio is increased, the flexibility is improved, but the flexibility is improved insignificantly when the EVA content exceeds 25 parts, the size of the foam hole is increased, the waterproof effect is reduced, and the flexibility is reduced when the EVA content is less than 15 parts, so that the application of the EVA in the sealing field is limited. The addition of EVA is related to compression and softness performance and is related to the structure of foam pores, the smaller the foam pores are, the better the waterproof performance is, and the closed pore structure can obviously improve the waterproof performance.
TABLE 1 relationship between EVA content and foamed sheet Properties
| EVA content (parts) | 10 | 15 | 20 | 25 | 30 |
| 25% compressive Strength (KPa) | 45 | 36 | 28 | 20 | 18 |
| Compression ratio (%) | 65 | 70 | 83 | 95 | 96 |
| Bubble size (μm) | 131 | 60 | 55 | 87 | 165 |
| Waterproof rating (IPX) | 6 | 7 | 6 | 5 | 5 |
Wherein, select for use 30 ~ 40 parts of ethylene-octene copolymer (POE) also to be concerned with compression, soft performance, also have the relation with the structure of cell, and the smaller waterproof can be corresponding better, has the obturator structure and can show improvement water-proof effects.
TABLE 2 relationship between POE content and foamed sheet Properties
| POE content (parts) | 25 | 30 | 35 | 40 | 45 |
| 25% compressive Strength (KPa) | 48 | 33 | 25 | 17 | 17 |
| Compression ratio (%) | 51 | 68 | 85 | 95 | 89 |
| Bubble size (μm) | 153 | 57 | 79 | 93 | 142 |
| Waterproof rating (IPX) | 6 | 7 | 7 | 7 | 4 |
1-3 parts of organic silicon elastomer is selected, wherein the organic silicon elastomer contains silicon which is used as a hydrophobic material, and the organic silicon elastomer also has a certain waterproof effect and reduces the viscosity of the foaming sheet. From the viewpoint of good compatibility with the resin, a mixture of a polydimethylsiloxane crosslinked copolymer and cyclomethicone which are good in compatibility with the resin is preferable. The mass ratio of the polydimethylsiloxane cross-linked copolymer to the cyclomethicone is preferably 1:2 to 1: 1.
Table 3 shows the relationship between the properties of the silicone elastomer and the foamed sheet
| Silicone elastomer content (parts) | 0 | 1 | 2 | 3 | 4 |
| 25% compressive Strength (KPa) | 65 | 44 | 35 | 28 | 24 |
| Compression ratio (%) | 45 | 65 | 78 | 94 | 81 |
| Bubble size (μm) | 131 | 50 | 67 | 92 | 150 |
| Waterproof rating (IPX) | 5 | 7 | 7 | 7 | 4 |
4-6 parts of foaming agent is selected, and the foaming agent has obvious influence on foaming performance. When the content of the foaming agent is small, sufficient foaming cannot be achieved, the apparent density becomes large, the rebound resilience becomes large, and a closed-cell foam cannot be obtained.
Table 4 shows the relationship between the content of foaming agent and the properties of the foamed sheet
| Content of foaming agent (parts) | 1 | 2 | 4 | 6 | 8 |
| 25% compressive Strength (KPa) | 119 | 74 | 42 | 30 | 10 |
| Compression ratio (%) | 10 | 32 | 68 | 85 | 89 |
| Apparent density (g/cm)3) | 0.6 | 0.4 | 0.18 | 0.12 | 0.08 |
| Closed cell content (%) | 50 | 65 | 97 | 99 | 78 |
| Waterproof rating (IPX) | 3 | 5 | 7 | 7 | 4 |
The oil filling rate of the ethylene propylene diene monomer rubber is 30-50%, the filled oil is preferably naphthenic oil and white mineral oil, and the two types of oil are selected for filling. The oil-extended rubber can reduce the viscosity of the oil, is beneficial to processing, and the oily material is waterproof, preferably naphthenic oil and white mineral oil, and has less smoke and no greater pollution when being processed.
TABLE 5 relationship between the oil filling rate of ethylene propylene diene monomer and the properties of the foamed sheets
| Oil extension (%) | 20 | 30 | 40 | 50 | 60 |
| 25% compressive Strength (KPa) | 30 | 27 | 24 | 22 | 20 |
| Compression ratio (%) | 70 | 75 | 88 | 90 | 90 |
| Waterproof rating (IPX) | 5 | 7 | 7 | 7 | 6 |
The VA content of the ethylene-vinyl acetate copolymer is 18-22%, so that the waterproof performance of the foamed sheet is improved, and the flexibility and the mechanical performance of the foamed sheet are ensured.
TABLE 6 relationship between VA content in ethylene-vinyl acetate copolymer and Performance between foamed sheets
| VA content (%) | 16 | 18 | 20 | 22 | 24 |
| 25% compressive Strength (KPa) | 58 | 36 | 30 | 22 | 16 |
| Compression ratio (%) | 60 | 65 | 72 | 80 | 88 |
| Waterproof rating (IPX) | 5 | 7 | 7 | 7 | 6 |
According to the invention, through the control of components and processes, internal holes in the foamed polyolefin foam are prepared into high closed holes, and the high closed-hole cellular structure can well play a role in waterproof. In addition, the foamed polyolefin provided by the invention can play a good waterproof role by adding the thermoplastic elastomer, the elastomer resin is a hydrophobic material, and after foaming, the specific closed cell structure can play a better waterproof role; simultaneously, the added EPDM is filled with oil, so that further prevention is made for water resistance. In addition, the organosilicon elastic body is added, so that the compatibility of the resin and the powder can be promoted, and meanwhile, the organosilicon elastic body contains silicon which is used as a hydrophobic material and has a certain waterproof effect. The waterproof capability of the foam is further improved by coating a layer of acrylic resin on the surface of the foam, and the waterproof performance reaches IPX7 level.
In one embodiment of the present invention, the foaming material further comprises the following components in parts by weight: 0.1-2 parts of antioxidant, 0.2-5 parts of lubricant, 0.1-3 parts of sensitizer and 2-10 parts of filler. The light foam material provided by the invention has the functions of shock absorption, buffering and sound insulation, and more importantly has a good waterproof function. To achieve high waterproof performance, the structure of the radiation cross-linked foam material is open-cell for common foam materials, and the radiation cross-linked foam material has high closed-cell performance, so that the cell structure can well play a waterproof effect, and meanwhile, the radiation cross-linked foam material is simple to process, environment-friendly and more stable in production and operation.
The waterproof polyolefin foam material is widely applied to electronic products, and has better waterproof performance than the existing waterproof polyolefin foam material.
FIG. 1 is a flow chart of the preparation method of the waterproof polyolefin foam material of the present invention, which can be seen from the figure, and comprises the following steps:
s1: weighing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer and ethylene-octene copolymer according to a set proportion, uniformly mixing for 5-10 minutes, and then extruding and granulating to obtain elastomer modified resin master batch;
s2: sequentially pouring the elastomer modified resin master batch, the sensitizer, the organic silicon elastomer and the lubricant into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 +/-5 ℃, the internal mixing time is 6-8 minutes, and then carrying out melt plasticizing granulation to obtain a sensitized master batch;
s3: pouring the elastomer modified resin master batch, the foaming agent, the filler, the lubricant and the organic silicon elastomer into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 +/-5 ℃, the internal mixing time is 6-8 minutes, and then carrying out melt plasticizing granulation to obtain a foaming master batch;
s4: mixing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer, ethylene-octene copolymer, sensitized master batch and foaming master batch for 2-6 minutes, and then discharging into an extruder to extrude into a foaming body substrate;
s5: performing electron irradiation crosslinking on the foaming body substrate, wherein the electron energy of the irradiation crosslinking is 0.1MeV-4.0MeV, and the irradiation dose is 3 Mrad-50 Mrad, so as to obtain a foaming body master slice;
s6: the foam mother sheet is subjected to free-form foaming to obtain a foamed sheet.
S7: and coating an acrylic waterproof coating on the surface of the foaming sheet.
In order to illustrate the process of the present invention in detail, the following examples are given.
Example 1
S1: weighing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer and ethylene-octene copolymer according to a set proportion, uniformly mixing for 5 minutes, and then extruding and granulating to obtain elastomer modified resin master batches;
s2: sequentially pouring the elastomer modified resin master batch, the sensitizer, the organic silicon elastomer and the lubricant into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 +/-1 ℃, the internal mixing time is 6 minutes, and then carrying out melt plasticizing granulation to obtain a sensitized master batch;
s3: pouring the elastomer modified resin master batch, the foaming agent, the filler, the lubricant and the organic silicon elastomer into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 ℃, and the internal mixing time is 6 minutes, and then carrying out melt plasticizing granulation to obtain a foaming master batch;
s4: mixing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer, ethylene-octene copolymer, sensitized master batch and foaming master batch for 6 minutes, and then discharging into an extruder to extrude into a foam substrate;
the raw materials are added in a total of several times before and after the preparation of the foam substrate, and the final foam substrate comprises the following components: the silicone elastomer is a mixture of a polydimethylsiloxane cross-linked copolymer and cyclomethicone, and preferably the mass ratio of the polydimethylsiloxane cross-linked copolymer to the cyclomethicone is 1: 2.
S5: performing electron irradiation crosslinking on the foaming body substrate, wherein the electron energy of the irradiation crosslinking is 0.1MeV, and the irradiation dose is 35 megarads, so as to obtain a foaming body master slice;
s6: the foam mother sheet is subjected to free-form foaming to obtain a foamed sheet.
S7: and coating an acrylic waterproof coating on the surface of the foaming sheet.
The properties of the waterproof polyolefin foamed sheet prepared according to the method of the present example were as follows: the closed cell rate is 99 percent, the average diameter of the cells is 50 mu m, the 25 percent compression strength is 28KPa, the compression ratio is 94 percent, and the waterproof grade is IPX 7.
Example 2
S1: weighing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer and ethylene-octene copolymer according to a set proportion, uniformly mixing for 10 minutes, and then extruding and granulating to obtain elastomer modified resin master batches;
s2: sequentially pouring the elastomer modified resin master batch, the sensitizer, the organic silicon elastomer and the lubricant into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 +/-5 ℃, the internal mixing time is 7 minutes, and then carrying out melt plasticizing granulation to obtain a sensitized master batch;
s3: pouring the elastomer modified resin master batch, the foaming agent, the filler, the lubricant and the organic silicon elastomer into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 +/-1 ℃, the internal mixing time is 8 minutes, and then carrying out melt plasticizing granulation to obtain a foaming master batch;
s4: mixing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer, ethylene-octene copolymer, sensitized master batch and foaming master batch for 2 minutes, and then discharging into an extruder to extrude into a foam substrate;
the raw materials are added in a total of several times before and after the preparation of the foam substrate, and the final foam substrate comprises the following components: the silicone elastomer is a mixture of a polydimethylsiloxane cross-linked copolymer and cyclomethicone, and preferably the mass ratio of the polydimethylsiloxane cross-linked copolymer to the cyclomethicone is 1: 1.
S5: performing electron irradiation crosslinking on the foaming body substrate, wherein the electron energy of the irradiation crosslinking is 0.9MeV, and the irradiation dose is 50 megarads, so as to obtain a foaming body master slice;
s6: the foam mother sheet is subjected to free-form foaming to obtain a foamed sheet.
S7: and coating an acrylic waterproof coating on the surface of the foaming sheet.
The properties of the waterproof polyolefin foamed sheet prepared according to the method of the present example were as follows: the closed cell rate is 99 percent, the average diameter of the cells is 67 mu m, the 25 percent compression strength is 25KPa, the compression ratio is 92 percent, and the waterproof grade is IPX 7.
Example 3
S1: weighing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer and ethylene-octene copolymer according to a set proportion, uniformly mixing for 8 minutes, and then extruding and granulating to obtain elastomer modified resin master batches;
s2: sequentially pouring the elastomer modified resin master batch, the sensitizer, the organic silicon elastomer and the lubricant into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 +/-2 ℃, the internal mixing time is 8 minutes, and then carrying out melt plasticizing granulation to obtain a sensitized master batch;
s3: pouring the elastomer modified resin master batch, the foaming agent, the filler, the lubricant and the organic silicon elastomer into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 +/-5 ℃, the internal mixing time is 7 minutes, and then carrying out melt plasticizing granulation to obtain a foaming master batch;
s4: mixing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer, ethylene-octene copolymer, sensitized master batch and foaming master batch for 4 minutes, and then discharging into an extruder to extrude into a foam substrate;
the raw materials are added in a total of several times before and after the preparation of the foam substrate, and the final foam substrate comprises the following components: 100 parts of Ethylene Propylene Diene Monomer (EPDM), 20 parts of ethylene-vinyl acetate copolymer (EVA), 34 parts of ethylene-octene copolymer (POE), 2 parts of silicone elastomer and 5 parts of foaming agent, wherein the silicone elastomer is a mixture of polydimethylsiloxane cross-linked copolymer and cyclomethicone, preferably the polydimethylsiloxane cross-linked copolymer: the mass ratio of cyclomethicone is 2: 3.
S5: carrying out electron irradiation crosslinking on the foaming body substrate, wherein the electron energy of the irradiation crosslinking is 4.0MeV, and the irradiation dose is 150 megarads, so as to obtain a foaming body master slice;
s6: the foam mother sheet is subjected to free-form foaming to obtain a foamed sheet.
S7: and coating an acrylic waterproof coating on the surface of the foaming sheet.
The properties of the waterproof polyolefin foamed sheet prepared according to the method of the present example were as follows: the closed cell rate is 98%, the average diameter of the cells is 89 μm, the 25% compression strength is 22KPa, the compression ratio is 93%, and the waterproof grade is IPX 7.
Example 4
S1: weighing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer and ethylene-octene copolymer according to a set proportion, uniformly mixing for 6 minutes, and then extruding and granulating to obtain elastomer modified resin master batches;
s2: sequentially pouring the elastomer modified resin master batch, the sensitizer, the organic silicon elastomer and the lubricant into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 ℃, the internal mixing time is 7 minutes, and then carrying out melt plasticizing granulation to obtain a sensitized master batch;
s3: pouring the elastomer modified resin master batch, the foaming agent, the filler, the lubricant and the organic silicon elastomer into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 +/-3 ℃, the internal mixing time is 8 minutes, and then carrying out melt plasticizing granulation to obtain a foaming master batch;
s4: mixing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer, ethylene-octene copolymer, sensitized master batch and foaming master batch for 5 minutes, and then discharging into an extruder to extrude into a foam substrate;
the raw materials are added in a total of several times before and after the preparation of the foam substrate, and the final foam substrate comprises the following components: the silicone elastomer is a mixture of a polydimethylsiloxane cross-linked copolymer and cyclomethicone, and preferably the mass ratio of the polydimethylsiloxane cross-linked copolymer to the cyclomethicone is 1: 1. S5: performing electron irradiation crosslinking on the foaming body substrate, wherein the electron energy of the irradiation crosslinking is 3.0MeV, and the irradiation dose is 3 megarads, so as to obtain a foaming body master slice;
s6: the foam mother sheet is subjected to free-form foaming to obtain a foamed sheet.
S7: and coating an acrylic waterproof coating on the surface of the foaming sheet.
The properties of the waterproof polyolefin foamed sheet prepared according to the method of the present example were as follows: the closed cell rate is 95%, the average diameter of the cells is 96 mu m, the 25% compression strength is 17KPa, the compression ratio is 82%, and the waterproof grade is IPX 7.
Comparative example 1:
s1: weighing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer and ethylene-octene copolymer according to a set proportion, uniformly mixing for 5 minutes, and then extruding and granulating to obtain elastomer modified resin master batches;
s2: sequentially pouring the elastomer modified resin master batch, the sensitizer, the organic silicon elastomer and the lubricant into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 +/-1 ℃, the internal mixing time is 6 minutes, and then carrying out melt plasticizing granulation to obtain a sensitized master batch;
s3: pouring the elastomer modified resin master batch, the foaming agent, the filler, the lubricant and the organic silicon elastomer into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 ℃, and the internal mixing time is 6 minutes, and then carrying out melt plasticizing granulation to obtain a foaming master batch;
s4: mixing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer, ethylene-octene copolymer, sensitized master batch and foaming master batch for 6 minutes, and then discharging into an extruder to extrude into a foam substrate;
the raw materials are added in a total of several times before and after the preparation of the foam substrate, and the final foam substrate comprises the following components: 80 parts of Ethylene Propylene Diene Monomer (EPDM), 20 parts of ethylene-vinyl acetate copolymer (EVA), 35 parts of ethylene-octene copolymer (POE), 3 parts of silicone elastomer and 6 parts of foaming agent, wherein the silicone elastomer is a mixture of polydimethylsiloxane cross-linked copolymer and cyclomethicone, preferably the polydimethylsiloxane cross-linked copolymer: the mass ratio of cyclomethicone is 1: 2.
S5: performing electron irradiation crosslinking on the foaming body substrate, wherein the electron energy of the irradiation crosslinking is 0.1MeV, and the irradiation dose is 35 megarads, so as to obtain a foaming body master slice;
s6: the foam mother sheet is subjected to free-form foaming to obtain a foamed sheet.
S7: and coating an acrylic waterproof coating on the surface of the foaming sheet.
The properties of the waterproof polyolefin foamed sheet prepared according to the method of the present example were as follows: the closed cell rate is 85%, the average diameter of the cells is 132 μm, the 25% compressive strength is 88KPa, the compression ratio is 54%, and the waterproof grade is IPX 5.
Comparative example 2:
s1: weighing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer and ethylene-octene copolymer according to a set proportion, uniformly mixing for 5 minutes, and then extruding and granulating to obtain elastomer modified resin master batches;
s2: sequentially pouring the elastomer modified resin master batch, the sensitizer, the organic silicon elastomer and the lubricant into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 +/-1 ℃, the internal mixing time is 6 minutes, and then carrying out melt plasticizing granulation to obtain a sensitized master batch;
s3: pouring the elastomer modified resin master batch, the foaming agent, the filler and the lubricant into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 ℃, the internal mixing time is 6 minutes, and then performing melt plasticizing granulation to obtain a foaming master batch;
s4: mixing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer, ethylene-octene copolymer, sensitized master batch and foaming master batch for 6 minutes, and then discharging into an extruder to extrude into a foam substrate;
the raw materials are added in a total of several times before and after the preparation of the foam substrate, and the final foam substrate comprises the following components: 100 parts of Ethylene Propylene Diene Monomer (EPDM), 20 parts of ethylene-vinyl acetate copolymer (EVA), 34 parts of ethylene-octene copolymer (POE) and 5 parts of foaming agent,
s5: performing electron irradiation crosslinking on the foaming body substrate, wherein the electron energy of the irradiation crosslinking is 0.1MeV, and the irradiation dose is 35 megarads, so as to obtain a foaming body master slice;
s6: the foam mother sheet is subjected to free-form foaming to obtain a foamed sheet.
S7: and coating an acrylic waterproof coating on the surface of the foaming sheet.
The properties of the waterproof polyolefin foamed sheet prepared according to the method of the present example were as follows: the closed cell rate is 78%, the average diameter of the cells is 167 mu m, the 25% compression strength is 75KPa, the compression ratio is 42%, and the waterproof grade is IPX 4.
Comparative example 3:
s1: weighing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer and ethylene-octene copolymer according to a set proportion, uniformly mixing for 5 minutes, and then extruding and granulating to obtain elastomer modified resin master batches;
s2: sequentially pouring the elastomer modified resin master batch, the sensitizer, the organic silicon elastomer and the lubricant into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 +/-1 ℃, the internal mixing time is 6 minutes, and then carrying out melt plasticizing granulation to obtain a sensitized master batch;
s3: pouring the elastomer modified resin master batch, the foaming agent, the filler, the lubricant and the organic silicon elastomer into an internal mixer according to a set proportion for internal mixing, wherein the internal mixing temperature is 120 ℃, and the internal mixing time is 6 minutes, and then carrying out melt plasticizing granulation to obtain a foaming master batch;
s4: mixing ethylene propylene diene monomer, ethylene-vinyl acetate copolymer, ethylene-octene copolymer, sensitized master batch and foaming master batch for 6 minutes, and then discharging into an extruder to extrude into a foam substrate;
the raw materials are added in a total of several times before and after the preparation of the foam substrate, and the final foam substrate comprises the following components: 100 parts of Ethylene Propylene Diene Monomer (EPDM), 20 parts of ethylene-vinyl acetate copolymer (EVA), 34 parts of ethylene-octene copolymer (POE), 5 parts of foaming agent, 6 parts of silicone elastomer, wherein the silicone elastomer is a mixture of polydimethylsiloxane cross-linked copolymer and cyclomethicone, preferably the polydimethylsiloxane cross-linked copolymer: the mass ratio of cyclomethicone is 2: 3.
S5: performing electron irradiation crosslinking on the foaming body substrate, wherein the electron energy of the irradiation crosslinking is 0.1MeV, and the irradiation dose is 35 megarads, so as to obtain a foaming body master slice;
s6: the foam mother sheet is subjected to free-form foaming to obtain a foamed sheet.
S7: and coating an acrylic waterproof coating on the surface of the foaming sheet.
The properties of the waterproof polyolefin foamed sheet prepared according to the method of the present example were as follows: the closed cell rate is 72 percent, the average diameter of cells is 189 mu m, the 25 percent compression strength is 62KPa, the compression ratio is 33 percent, and the waterproof grade is IPX 4.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (5)
1. The waterproof polyolefin foam material is characterized in that a layer of acrylic waterproof coating is coated on the surface of the waterproof polyolefin foam material, and the waterproof polyolefin foam material comprises the following components in parts by weight:
100 parts of Ethylene Propylene Diene Monomer (EPDM),
15-25 parts of ethylene-vinyl acetate copolymer (EVA),
30-40 parts of ethylene-octene copolymer (POE),
1-3 parts of organic silicon elastomer,
4 to 6 parts of a foaming agent,
the silicone elastomer is a mixture of a polydimethylsiloxane cross-linked copolymer and cyclomethicone, the mass ratio of the polydimethylsiloxane cross-linked copolymer to the cyclomethicone is =1: 2-1: 1, the oil-filling rate of the ethylene propylene diene monomer rubber is 30% -50%, and the VA content of the ethylene-vinyl acetate copolymer is 18% -22%.
2. The waterproof polyolefin foam material of claim 1, which is in the form of a sheet having a thickness of not more than 10mm, and has closed cells in a unit area in an amount larger than the number of open cells, a closed cell ratio of 95 to 100% and an average cell diameter of 50 to 100 μm.
3. The waterproof polyolefin foam material of claim 2, which has a waterproof performance of IPX7 grade.
4. The waterproof polyolefin foam material of claim 1, wherein the waterproof polyolefin foam material further comprises the following components in parts by weight: 0.1-2 parts of antioxidant, 0.2-5 parts of lubricant, 0.1-3 parts of sensitizer and 2-10 parts of filler.
5. Use of the waterproof polyolefin foam material as claimed in any one of claims 1 to 4 in electronic products.
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002146072A (en) * | 2000-11-08 | 2002-05-22 | Nitto Denko Corp | Vulcanizable and foamable rubber-based composition and foam thereof |
| WO2007044123A1 (en) * | 2005-10-07 | 2007-04-19 | Advanced Elastomer Systems, L.P. | Microcellular foams of thermoplastic vulcanizates |
| CN101497721A (en) * | 2009-02-26 | 2009-08-05 | 江苏工业学院 | Foam material and moulding method thereof |
| CN105462512A (en) * | 2015-12-22 | 2016-04-06 | 苏州贝斯珂胶粘科技有限公司 | Ultrathin and waterproof foam adhesive tape and preparation method thereof |
| CN106317631A (en) * | 2016-08-29 | 2017-01-11 | 湖北祥源新材科技股份有限公司 | Polypropylene foamed sheet and preparation method thereof |
| CN106977760A (en) * | 2017-04-20 | 2017-07-25 | 苏州固德新材科技有限公司 | Super soft high resilience resin foamed material and preparation method thereof |
| CN107379695A (en) * | 2017-06-05 | 2017-11-24 | 广东富利时实业有限公司 | A kind of closed cell foamed material and its manufacture formula and method |
-
2018
- 2018-02-07 CN CN201810124343.7A patent/CN108342023B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002146072A (en) * | 2000-11-08 | 2002-05-22 | Nitto Denko Corp | Vulcanizable and foamable rubber-based composition and foam thereof |
| WO2007044123A1 (en) * | 2005-10-07 | 2007-04-19 | Advanced Elastomer Systems, L.P. | Microcellular foams of thermoplastic vulcanizates |
| CN101497721A (en) * | 2009-02-26 | 2009-08-05 | 江苏工业学院 | Foam material and moulding method thereof |
| CN105462512A (en) * | 2015-12-22 | 2016-04-06 | 苏州贝斯珂胶粘科技有限公司 | Ultrathin and waterproof foam adhesive tape and preparation method thereof |
| CN106317631A (en) * | 2016-08-29 | 2017-01-11 | 湖北祥源新材科技股份有限公司 | Polypropylene foamed sheet and preparation method thereof |
| CN106977760A (en) * | 2017-04-20 | 2017-07-25 | 苏州固德新材科技有限公司 | Super soft high resilience resin foamed material and preparation method thereof |
| CN107379695A (en) * | 2017-06-05 | 2017-11-24 | 广东富利时实业有限公司 | A kind of closed cell foamed material and its manufacture formula and method |
Non-Patent Citations (2)
| Title |
|---|
| Study on foaming water‐swellable EPDM rubber;Sun X et al;《Journal of applied polymer science》;20021027;第14卷(第86期);第3712-3717页 * |
| 配方因素对EPDM发泡材料性能的影响;牛杰 等;《橡胶工业》;20050922;第52卷(第8期);第476-479页 * |
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