CN117841495A - Polypropylene synthetic paper with ultrahigh interlayer binding force and preparation method thereof - Google Patents
Polypropylene synthetic paper with ultrahigh interlayer binding force and preparation method thereof Download PDFInfo
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- CN117841495A CN117841495A CN202410257010.7A CN202410257010A CN117841495A CN 117841495 A CN117841495 A CN 117841495A CN 202410257010 A CN202410257010 A CN 202410257010A CN 117841495 A CN117841495 A CN 117841495A
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- -1 Polypropylene Polymers 0.000 title claims abstract description 70
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 70
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 70
- 239000011229 interlayer Substances 0.000 title claims abstract description 29
- 238000002360 preparation method Methods 0.000 title abstract description 9
- 239000002344 surface layer Substances 0.000 claims abstract description 76
- 239000010410 layer Substances 0.000 claims abstract description 63
- 239000002994 raw material Substances 0.000 claims abstract description 46
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 claims abstract description 45
- 229920001577 copolymer Polymers 0.000 claims abstract description 44
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 34
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 22
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 22
- 239000004408 titanium dioxide Substances 0.000 claims abstract description 17
- JSQLPIGKVBUMBF-UHFFFAOYSA-N methyl 2-(4-aminophenyl)propanoate Chemical compound COC(=O)C(C)C1=CC=C(N)C=C1 JSQLPIGKVBUMBF-UHFFFAOYSA-N 0.000 claims abstract description 15
- VKYKSIONXSXAKP-UHFFFAOYSA-N hexamethylenetetramine Chemical compound C1N(C2)CN3CN1CN2C3 VKYKSIONXSXAKP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229960000583 acetic acid Drugs 0.000 claims abstract description 11
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 11
- 239000012362 glacial acetic acid Substances 0.000 claims abstract description 11
- 229920005630 polypropylene random copolymer Polymers 0.000 claims abstract description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 239000008367 deionised water Substances 0.000 claims description 21
- 229910021641 deionized water Inorganic materials 0.000 claims description 21
- 238000001816 cooling Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 7
- 229920000642 polymer Polymers 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 238000005406 washing Methods 0.000 claims description 7
- 238000001125 extrusion Methods 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 6
- 238000001291 vacuum drying Methods 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 238000009966 trimming Methods 0.000 claims description 3
- 239000000314 lubricant Substances 0.000 claims description 2
- 239000003999 initiator Substances 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 24
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 5
- 239000004926 polymethyl methacrylate Substances 0.000 description 5
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 238000001035 drying Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 229920005606 polypropylene copolymer Polymers 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 239000001038 titanium pigment Substances 0.000 description 2
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000019400 benzoyl peroxide Nutrition 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- CERQOIWHTDAKMF-UHFFFAOYSA-M methacrylate group Chemical group C(C(=C)C)(=O)[O-] CERQOIWHTDAKMF-UHFFFAOYSA-M 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920005629 polypropylene homopolymer Polymers 0.000 description 1
- 239000000047 product Substances 0.000 description 1
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- Laminated Bodies (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
Abstract
The invention discloses polypropylene synthetic paper with ultrahigh interlayer binding force and a preparation method thereof, and belongs to the technical field of synthetic paper. The polypropylene synthetic paper comprises an outer surface layer, a middle layer and an inner surface layer, wherein the outer surface layer comprises the following raw materials in parts by weight: 20-30 parts of polypropylene I, 2-4 parts of titanium dioxide and 2-4 parts of calcium carbonate; 20-30 parts of middle-layer polypropylene II, 2-4 parts of titanium dioxide and 10-20 parts of methyl methacrylate-based copolymer; the raw materials and parts of the inner surface layer are the same as those of the outer surface layer; the polypropylene I is a polypropylene random copolymer, and the polypropylene II is a homopolymerized polypropylene. Under the action of glacial acetic acid serving as an initiator, urotropine and methyl 2- (4-aminophenyl) propionate react to prepare the novel methyl methacrylate copolymer.
Description
Technical Field
The invention relates to the technical field of synthetic paper, in particular to polypropylene synthetic paper with ultrahigh interlayer binding force and a preparation method thereof.
Background
The polypropylene synthetic paper has the advantages of low carbon, environmental protection, small specific gravity, high strength, good weather resistance, good tear resistance, soft texture, good printing performance, durability and the like. The polypropylene synthetic paper has the characteristics of both plastic and paper, and is widely applied in the aspects of high-quality printing, high-end packaging, special use and the like. With the increase of application scenes of the polypropylene synthetic paper, more requirements are put on the polypropylene synthetic paper, such as higher tensile strength and interlayer binding force.
The Chinese patent publication No. CN104943308A discloses a polypropylene synthetic paper and a production method thereof, wherein the polypropylene synthetic paper comprises an outer surface layer, an intermediate layer and an inner surface layer, the outer surface layer is mainly prepared from titanium pigment, calcium carbonate and modified polypropylene copolymer, the intermediate layer is mainly prepared from polypropylene, the inner surface layer is mainly prepared from titanium pigment, calcium carbonate and modified polypropylene copolymer, the transverse tensile strength of the polypropylene synthetic paper prepared in the optimal example 4 is 36.8MPa, the longitudinal tensile strength is 39.2MPa, but the interlayer bonding strength, namely the Z-direction tensile strength, is only 297J/m 2 。
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide polypropylene synthetic paper with ultrahigh interlayer binding force and a preparation method thereof.
In order to achieve the above object, the present invention is realized by the following technical scheme:
the polypropylene synthetic paper with the ultra-high interlayer binding force comprises an outer surface layer, a middle layer and an inner surface layer, wherein the outer surface layer comprises the following raw materials in parts by weight: polypropylene I:20-30 parts of titanium dioxide: 2-4 parts of calcium carbonate: 2-4 parts;
the intermediate layer comprises the following raw materials in parts by weight: polypropylene II:20-30 parts of titanium dioxide: 2-4 parts of methyl methacrylate-based copolymer: 10-20 parts of a lubricant;
the raw materials and parts of the inner surface layer are the same as those of the outer surface layer;
the polypropylene I is polypropylene random copolymer, the polypropylene II is homopolymerized polypropylene,
the methyl methacrylate-based copolymer has a structural formula shown in a formula (I):
（I）。
further, the number average molecular weight of the methyl methacrylate-based copolymer is 3000 to 4200.
Further, the methyl methacrylate-based copolymer is prepared by the following method:
adding deionized water, urotropine, methyl 2- (4-aminophenyl) propionate and glacial acetic acid into a reaction kettle in sequence, stirring and dissolving, heating to 65-75 ℃, reacting for 2.5-3.5h, cooling to room temperature and layering, separating a water layer, washing with deionized water for 3 times to obtain a tan polymer, and vacuum drying at 70-80 ℃ to obtain the product. The reaction equation is as follows:
further, the feeding mass ratio of the deionized water to the urotropine to the methyl 2- (4-aminophenyl) propionate to the glacial acetic acid is 10:2.5 (1.5-2.0) to 1.0-1.2.
The preparation method of the polypropylene synthetic paper with the ultra-high interlayer binding force comprises the following steps:
s1: extruding the outer surface layer raw material, the middle layer raw material and the inner surface layer raw material through an extruder respectively;
s2: extruding all layers of raw materials extruded by an extruder through a T-shaped machine head, then longitudinally stretching, transversely stretching, cooling, corona and trimming to obtain the material;
wherein the extrusion temperature of the raw materials of the outer surface layer and the inner surface layer is 230 ℃, and the extrusion temperature of the raw materials of the middle layer is 250 ℃; the temperature of the preheating section for longitudinal stretching is 130 ℃, the temperature of the stretching section is 142 ℃, the temperature of the shaping section is 145 ℃, the longitudinal stretching ratio is 4.9, the temperature of the preheating section for transverse stretching is 167 ℃, the temperature of the stretching section is 155 ℃, the temperature of the shaping section is 171 ℃, the transverse stretching ratio is 9 times, and corona 34 is formed.
By adopting the technical scheme, the beneficial effects of the invention include:
(1) Under the action of glacial acetic acid serving as an initiator, urotropine reacts with methyl 2- (4-aminophenyl) propionate to prepare the novel methyl methacrylate copolymer.
(2) The polypropylene synthetic paper prepared by the invention has excellent tensile strength and interlayer bonding strength, and the interlayer bonding strength is as high as 582J/m 2 。
Detailed Description
The present invention is further described below with reference to examples, but the present invention is not limited to these examples.
Example 1
Preparation of methyl methacrylate-based copolymer:
adding 1kg of deionized water, 0.25kg of urotropine, 0.18kg of methyl 2- (4-aminophenyl) propionate and 0.11kg of glacial acetic acid into a reaction kettle in sequence, stirring and dissolving, heating to 70 ℃, reacting for 3 hours, cooling to room temperature and layering, separating a water layer, washing with deionized water for 3 times (each time using 0.2kg of deionized water), obtaining a tan polymer, and drying at 75 ℃ in vacuum for 10 hours to obtain the methyl methacrylate-based copolymer with the number average molecular weight of 3746.
Example 2
Preparation of methyl methacrylate-based copolymer:
adding 1kg of deionized water, 0.25kg of urotropine, 0.15kg of methyl 2- (4-aminophenyl) propionate and 0.1kg of glacial acetic acid into a reaction kettle in sequence, stirring and dissolving, heating to 65 ℃, reacting for 2.5h, cooling to room temperature for layering, separating a water layer, washing 3 times with deionized water (0.2 kg of deionized water is used each time), obtaining a tan polymer, and drying in vacuum at 70 ℃ for 12h to obtain the methyl methacrylate-based copolymer with the number average molecular weight of 3063.
Example 3
Preparation of methyl methacrylate-based copolymer:
adding 1kg of deionized water, 0.25kg of urotropine, 0.2kg of methyl 2- (4-aminophenyl) propionate and 0.12kg of glacial acetic acid into a reaction kettle in sequence, stirring and dissolving, heating to 75 ℃, reacting for 3.5 hours, cooling to room temperature and layering, separating a water layer, washing with deionized water for 3 times (0.2 kg of deionized water is used each time) to obtain a tan polymer, and drying at 80 ℃ in vacuum for 7 hours to obtain the methyl methacrylate-based copolymer with the number average molecular weight of 4187.
Example 4
The polypropylene synthetic paper with ultra-high interlayer binding force has the thickness of 0.20mm, the thicknesses of the outer surface layer and the inner surface layer are both 0.06mm, and the thickness of the middle layer is 0.08mm.
The raw materials of the outer surface layer are as follows: polypropylene I (TPC COSMOPLENE, trade name FL 7540L): 2.5kg, titanium dioxide: 0.3kg, calcium carbonate: 0.3kg; the intermediate layer comprises the following raw materials: polypropylene II (Yangzhi, brand YPF-3008): 2.5kg, titanium dioxide: 0.3kg of methyl methacrylate-based copolymer (prepared in example 1): 1.5kg; the raw materials and the proportion of the inner surface layer are the same as those of the outer surface layer.
Example 5
The polypropylene synthetic paper with ultra-high interlayer binding force has the thickness of 0.20mm, the thicknesses of the outer surface layer and the inner surface layer are both 0.06mm, and the thickness of the middle layer is 0.08mm.
The raw materials of the outer surface layer are as follows: polypropylene I (TPC COSMOPLENE, trade name FL 7540L): 2kg, titanium dioxide: 0.2kg, calcium carbonate: 0.2kg; the intermediate layer comprises the following raw materials: polypropylene II (Yangzhi, brand YPF-3008): 2kg, titanium dioxide: 0.2kg of methyl methacrylate-based copolymer (prepared in example 2): 1kg; the raw materials and the proportion of the inner surface layer are the same as those of the outer surface layer.
Example 6
The polypropylene synthetic paper with ultra-high interlayer binding force has the thickness of 0.20mm, the thicknesses of the outer surface layer and the inner surface layer are both 0.06mm, and the thickness of the middle layer is 0.08mm.
The raw materials of the outer surface layer are as follows: polypropylene I (TPC COSMOPLENE, trade name FL 7540L): 3kg, titanium dioxide: 0.4kg, calcium carbonate: 0.4kg; the intermediate layer comprises the following raw materials: polypropylene II (Yangzhi, brand YPF-3008): 3kg, titanium dioxide: 0.4kg of methyl methacrylate-based copolymer (prepared in example 3): 2kg; the raw materials and the proportion of the inner surface layer are the same as those of the outer surface layer.
Comparative example 1
The polypropylene synthetic paper with ultra-high interlayer binding force has the thickness of 0.20mm, the thicknesses of the outer surface layer and the inner surface layer are both 0.06mm, and the thickness of the middle layer is 0.08mm.
The raw materials of the outer surface layer are as follows: polypropylene I (TPC COSMOPLENE, trade name FL 7540L): 2.5kg, titanium dioxide: 0.3kg, calcium carbonate: 0.3kg; the intermediate layer comprises the following raw materials: polypropylene II (Yangzhi, brand YPF-3008): 2.5kg, titanium dioxide: 0.3kg of methyl methacrylate-based copolymer (number average molecular weight 2872): 1.5kg; the raw materials and the proportion of the inner surface layer are the same as those of the outer surface layer.
The methyl methacrylate-based copolymer used in this comparative example was prepared by the following method:
adding 1kg of deionized water, 0.25kg of urotropine, 0.15kg of methyl 2- (4-aminophenyl) propionate and 0.1kg of glacial acetic acid into a reaction kettle in sequence, stirring and dissolving, heating to 65 ℃, reacting for 2 hours, cooling to room temperature and layering, separating a water layer, washing 3 times with deionized water (0.2 kg of deionized water is used each time) to obtain a tan polymer, and vacuum-drying at 70 ℃ to obtain the methyl methacrylate-based copolymer with the number average molecular weight of 2872.
Comparative example 2
The polypropylene synthetic paper with ultra-high interlayer binding force has the thickness of 0.20mm, the thicknesses of the outer surface layer and the inner surface layer are both 0.06mm, and the thickness of the middle layer is 0.08mm.
The raw materials of the outer surface layer are as follows: polypropylene I (TPC COSMOPLENE, trade name FL 7540L): 2.5kg, titanium dioxide: 0.3kg, calcium carbonate: 0.3kg; the intermediate layer comprises the following raw materials: polypropylene II (Yangzhi, brand YPF-3008): 2.5kg, titanium dioxide: 0.3kg of methyl methacrylate-based copolymer (number average molecular weight 4394) 1.5kg; the raw materials and the proportion of the inner surface layer are the same as those of the outer surface layer.
The methyl methacrylate-based copolymer used in this comparative example was prepared by the following method:
adding 1kg of deionized water, 0.25kg of urotropine, 0.25kg of methyl 2- (4-aminophenyl) propionate and 0.12kg of glacial acetic acid into a reaction kettle in sequence, stirring and dissolving, heating to 75 ℃, reacting for 4 hours, cooling to room temperature and layering, separating a water layer, washing with deionized water for 3 times (0.2 kg of deionized water is used each time) to obtain a tan polymer, and vacuum-drying at 80 ℃ to obtain the methyl methacrylate-based copolymer with the number average molecular weight of 4394.
Comparative example 3
The thickness of the polypropylene synthetic paper is 0.20mm, the thickness of the outer surface layer and the inner surface layer is 0.06mm, and the thickness of the middle layer is 0.08mm. The composition and ratio of the raw materials of the outer layer, the intermediate layer and the outer layer were substantially the same as in example 4, except that 1.5kg of the methyl methacrylate-based copolymer was replaced with 1.5kg of methyl 2- (4-aminophenyl) propionate.
Comparative example 4
The thickness of the polypropylene synthetic paper is 0.20mm, the thickness of the outer surface layer and the inner surface layer is 0.06mm, and the thickness of the middle layer is 0.08mm. The composition and ratio of the raw materials of the outer surface layer, the intermediate layer and the outer surface layer were substantially the same as in example 4 except that 1.5kg of the methyl methacrylate-based copolymer was replaced with 0.88kg of urotropine and 0.63kg of methyl 2- (4-aminophenyl) propionate.
Comparative example 5
The thickness of the polypropylene synthetic paper is 0.20mm, the thickness of the outer surface layer and the inner surface layer is 0.06mm, and the thickness of the middle layer is 0.08mm. The composition and ratio of the raw materials of the outer skin layer, the intermediate layer and the outer skin layer were substantially the same as in example 4, except that 1.5kg of the methyl methacrylate-based copolymer was replaced with 0.5kg of the methyl methacrylate-based copolymer.
Comparative example 6
The thickness of the polypropylene synthetic paper is 0.20mm, the thickness of the outer surface layer and the inner surface layer is 0.06mm, and the thickness of the middle layer is 0.08mm. The composition and ratio of the raw materials of the outer skin layer, the intermediate layer and the outer skin layer were substantially the same as in example 4, except that the intermediate layer was not added with the methyl methacrylate-based copolymer.
Comparative example 7
The thickness of the polypropylene synthetic paper is 0.20mm, the thickness of the outer surface layer and the inner surface layer is 0.06mm, and the thickness of the middle layer is 0.08mm. The composition and ratio of the raw materials of the outer skin layer, the intermediate layer and the outer skin layer were substantially the same as in example 4, except that 1.5kg of the methyl methacrylate-based copolymer was replaced with 1.5kg of polymethyl methacrylate.
The polymethyl methacrylate in this comparative example was prepared by the following method:
100g of methyl methacrylate, 24.2g of dibenzoyl peroxide and 300g of benzene are added into a reaction bottle, stirred, nitrogen protected, heated to 80 ℃ for reaction for 2 hours, 400ml of THF is added, then 500ml of petroleum ether is added to obtain first precipitate, the first precipitate is added into 300ml of THF, then 500ml of petroleum ether is added to obtain second precipitate, and finally vacuum drying is carried out at 60 ℃ for 8 hours to obtain the catalyst.
The polypropylene synthetic papers of examples 4-6 and comparative examples 1-7 of the present application were prepared by the following process:
s1: extruding the outer surface layer raw material, the middle layer raw material and the inner surface layer raw material through an extruder respectively;
s2: extruding all layers of raw materials extruded by an extruder through a T-shaped machine head, then longitudinally stretching, transversely stretching, cooling, corona and trimming to obtain the material;
wherein the extrusion temperature of the raw materials of the outer surface layer and the inner surface layer is 230 ℃, and the extrusion temperature of the raw materials of the middle layer is 250 ℃; the temperature of the preheating section for longitudinal stretching is 130 ℃, the temperature of the stretching section is 142 ℃, the temperature of the shaping section is 145 ℃, the longitudinal stretching ratio is 4.9, the temperature of the preheating section for transverse stretching is 167 ℃, the temperature of the stretching section is 155 ℃, the temperature of the shaping section is 171 ℃, the transverse stretching ratio is 9 times, and corona 34 is formed.
The titanium dioxide used in the examples and comparative examples was DuPont R-706 and the calcium carbonate was KJ-106.
The polypropylene synthetic papers prepared in examples 4 to 6 and comparative examples 1 to 7 of the present application were subjected to tensile strength test according to the method of GB13022-91, and interlayer bonding strength of the synthetic papers was tested using an LB-T541 type Z-direction tensile strength tester, and the test results are shown in Table 1.
TABLE 1
As can be seen from examples 4, 5 and 6 in Table 1, the polypropylene synthetic paper prepared by the invention has transverse and longitudinal mechanical strength respectively greater than 80MPa and 70MPa, and interlayer bonding strength higher than 550J/m 2 Has excellent tensile strength and interlayer bonding strength.
Comparative example 1 and comparative example 2 are comparative examples different from example 4 in that the number average molecular weight of the methyl methacrylate-based copolymer used was different, and it can be seen from the data of Table 1 that the interlayer bonding strength of the synthetic paper was lower than 520J/m when the number average molecular weight of the methyl methacrylate-based copolymer was lower than 3000 and higher than 4200 2 。
Comparative examples 3 and 4 are comparative examples different from example 4 in that methyl methacrylate-based copolymer was replaced with methyl 2- (4-aminophenyl) propionate, urotropine and methyl 2- (4-aminophenyl) propionate, and it can be seen from Table 1 that the interlayer bonding strength of the synthetic paper thereof was less than 350J/m 2 。
Comparative example 5 was different in that 1.5kg of methyl methacrylate-based copolymer was replaced with 0.5kg of methyl methacrylate-based copolymer, and comparative example 6 was free from the addition of methyl methacrylate-based copolymer, and it can be seen from Table 1 that the interlayer bonding strength of comparative examples 5, 6 was only 451J/m 2 、302J/m 2 。
Comparative example 7 is a comparative example different from example 4 in that the methyl methacrylate-based copolymer was replaced with 1.5kg of polymethyl methacrylate, and it can be seen from Table 1 that the interlayer bonding strength of the synthetic paper thereof was only 389J/m 2 。
The polypropylene I in the outer surface layer and the inner surface layer is a polypropylene random copolymer containing methyl methacrylate grafting, the polypropylene II in the middle layer is homo-polypropylene, and when three layers are respectively extruded by an extruder and then extruded and stretched by a T-shaped machine head, the compatibility between the middle layer and the inner surface layer is lower due to the difference of structural monomers of the polypropylene in the middle layer and the polypropylene in the inner surface layer and the polypropylene in the outer surface layer. After the copolymer containing the methyl methacrylate grafted functional groups is added into the middle layer, the middle layer and the inner and outer surface layers are provided with the methyl methacrylate grafted functional groups, the surface tension between the middle layer and the inner and outer surface layers is reduced, the dispersibility of two polypropylene layers at the contact position of the middle layer and the inner and outer surface layers is improved, the compatibility of the middle layer and the methyl methacrylate grafted polypropylene is improved, and further the mechanical performance index of the synthetic paper is improved.
The methyl methacrylate functional groups with similar compatibility in the methyl methacrylate copolymer monomer shown in the formula (I) have relatively far molecular spacing, and when the methyl methacrylate copolymer is contacted with the polypropylene I at high temperature, the methyl methacrylate monomer functional groups in the polypropylene I are less in molecular steric hindrance when being uniformly mixed with the methyl methacrylate copolymer, and the compatibility between the methyl methacrylate monomer functional groups and the methyl methacrylate copolymer is higher; and the polymethyl methacrylate functional groups in polymethyl methacrylate (in comparative example 7) have relatively close molecular spacing and relatively low compatibility when in intermolecular contact miscibility, so that the polypropylene synthetic paper prepared by the invention has excellent tensile strength and interlayer bonding strength.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention; however, those skilled in the art can make various changes, modifications and variations equivalent to the above-described embodiments without departing from the scope of the technical solution of the present invention; meanwhile, any equivalent changes, modifications and evolution of the above embodiments according to the essential technology of the present invention still fall within the scope of the present invention.
Claims (5)
1. The polypropylene synthetic paper with the ultra-high interlayer binding force comprises an outer surface layer, a middle layer and an inner surface layer, and is characterized in that the outer surface layer comprises the following raw materials in parts by weight: polypropylene I:20-30 parts of titanium dioxide: 2-4 parts of calcium carbonate: 2-4 parts;
the intermediate layer comprises the following raw materials in parts by weight: polypropylene II:20-30 parts of titanium dioxide: 2-4 parts of methyl methacrylate-based copolymer: 10-20 parts of a lubricant;
the raw materials and parts of the inner surface layer are the same as those of the outer surface layer;
the polypropylene I is polypropylene random copolymer, the polypropylene II is homopolymerized polypropylene,
the methyl methacrylate-based copolymer has a structural formula shown in a formula (I):
（I）。
2. the polypropylene synthetic paper having ultra-high interlayer bonding force according to claim 1, wherein the number average molecular weight of the methyl methacrylate-based copolymer is 3000-4200.
3. The polypropylene synthetic paper having ultra high interlayer bonding force according to claim 1, wherein the methyl methacrylate-based copolymer is prepared by:
adding deionized water, urotropine, methyl 2- (4-aminophenyl) propionate and glacial acetic acid into a reaction kettle in sequence, stirring and dissolving, heating to 65-75 ℃, reacting for 2.5-3.5h, cooling to room temperature and layering, separating a water layer, washing with deionized water for 3 times to obtain a tan polymer, and vacuum drying at 70-80 ℃ to obtain the product.
4. The polypropylene synthetic paper with ultra-high interlayer binding force according to claim 3, wherein the mass ratio of deionized water, urotropine, methyl 2- (4-aminophenyl) propionate and glacial acetic acid is 10:2.5 (1.5-2.0) to (1.0-1.2).
5. A method for preparing the polypropylene synthetic paper with ultra-high interlayer binding force according to any one of claims 1 to 4, comprising the following steps:
s1: extruding the outer surface layer raw material, the middle layer raw material and the inner surface layer raw material through an extruder respectively;
s2: extruding all layers of raw materials extruded by an extruder through a T-shaped machine head, then longitudinally stretching, transversely stretching, cooling, corona and trimming to obtain the material;
wherein the extrusion temperature of the raw materials of the outer surface layer and the inner surface layer is 230 ℃, and the extrusion temperature of the raw materials of the middle layer is 250 ℃; the temperature of the preheating section for longitudinal stretching is 130 ℃, the temperature of the stretching section is 142 ℃, the temperature of the shaping section is 145 ℃, the longitudinal stretching ratio is 4.9, the temperature of the preheating section for transverse stretching is 167 ℃, the temperature of the stretching section is 155 ℃, the temperature of the shaping section is 171 ℃, the transverse stretching ratio is 9 times, and corona 34 is formed.
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