CN117211082A - Humidity-resistant heat-aging-resistant PVC building film structural material and preparation method thereof - Google Patents
Humidity-resistant heat-aging-resistant PVC building film structural material and preparation method thereof Download PDFInfo
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- HBGGXOJOCNVPFY-UHFFFAOYSA-N diisononyl phthalate Chemical compound CC(C)CCCCCCOC(=O)C1=CC=CC=C1C(=O)OCCCCCCC(C)C HBGGXOJOCNVPFY-UHFFFAOYSA-N 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
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- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical compound C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 description 5
- UUEWCQRISZBELL-UHFFFAOYSA-N 3-trimethoxysilylpropane-1-thiol Chemical compound CO[Si](OC)(OC)CCCS UUEWCQRISZBELL-UHFFFAOYSA-N 0.000 description 5
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- BSKJUAKMZZKMKC-UHFFFAOYSA-N 1,2-ditert-butyl-3,4-di(propan-2-yl)benzene Chemical compound CC(C)C1=CC=C(C(C)(C)C)C(C(C)(C)C)=C1C(C)C BSKJUAKMZZKMKC-UHFFFAOYSA-N 0.000 description 1
- HBFCKUCCFLNUHJ-UHFFFAOYSA-N 3-dimethoxysilylpropane-1-thiol Chemical compound CO[SiH](OC)CCCS HBFCKUCCFLNUHJ-UHFFFAOYSA-N 0.000 description 1
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- YTZKOQUCBOVLHL-UHFFFAOYSA-N p-methylisopropylbenzene Natural products CC(C)(C)C1=CC=CC=C1 YTZKOQUCBOVLHL-UHFFFAOYSA-N 0.000 description 1
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- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Laminated Bodies (AREA)
Abstract
The invention provides a wet heat aging resistant PVC building film structural material and a preparation method thereof, wherein the preparation method adopts fluorine-containing acrylate block copolymer to carry out hydrophobic treatment on fabrics, and then a composite cross-linking agent consisting of a sulfhydryl silane coupling agent and peroxide is added into the coated PVC slurry to prepare the wet heat aging resistant PVC building film structural material; the PVC film structural material is prepared by a coating method, so that the PVC film structural material has more excellent air tightness and hydrophobic property. In a damp and hot environment, the fluorine-containing segmented copolymer with active groups (-OH and C=C) is easy to generate a crosslinking reaction with a main crosslinking agent in the PVC coating under the assistance of a crosslinking assistant, so that a crosslinked network structure is formed between the fiber and the PVC resin, and the stripping performance is effectively improved while the tensile strength loss of the product is reduced; the preparation process has simple steps and high product applicability, and the processed product has excellent wet heat aging resistance.
Description
Technical Field
The invention belongs to the technical field of building film composite materials, and particularly relates to a wet heat aging resistant PVC building film structural material and a preparation method thereof.
Background
The polyester fabric is used as a structural reinforcement body, has excellent mechanical property and dimensional stability, is often used as a framework material to be compounded with polyvinyl chloride resin, and further obtains the PET fabric reinforced PVC building film structural material with a sandwich structure.
However, under the influence of damp and hot environment, the edge of the skeleton fabric is exposed, and the interior of the PVC building film structural material made of the conventional polyester fabric (without hydrophobic treatment) is extremely easy to generate a 'wick effect' due to the capillary action of the fabric, so that the mechanical properties (such as peel strength, tensile strength and the like) of the PVC building film structural material are seriously reduced, the service life of the film structural composite material is greatly shortened, and therefore, the development of the PVC building film structural material with good damp and hot aging resistance is one of the preconditions for ensuring the durability design of the fiber reinforced resin matrix composite material.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a preparation method of a wet heat aging resistant PVC building film structural material, and the PVC building film structural material prepared by the preparation method has obviously reduced mechanical property loss and even enhanced tensile strength when applied to a wet heat environment.
A preparation method of a wet heat aging resistant PVC building film structural material comprises the following steps:
(1) Performing hydrophobic treatment on the fabric by using a hydrophobic agent;
(2) PVC paste is prepared by taking PVC paste resin, plasticizer, heat stabilizer and composite cross-linking agent as raw materials;
(3) And respectively coating PVC sizing agent on the front side and the back side of the fabric subjected to the hydrophobic treatment, and plasticizing and forming to obtain the wet heat aging resistant PVC building film structural material.
In the step (1) of the preparation method:
preferably, the hydrophobizing agent is a fluoroacrylate block copolymer. As a further preferable aspect, the hydrophobizing agent is one or more of TG5573, TG5673, TG5671, DH 3602. Still more preferably one or both of TG5573 and TG 5673.
Preferably, the specific operations of hydrophobic treatment of the fabric are:
mixing the hydrophobing agent with deionized water, unreeling and immersing the fabric therein, padding, taking out, drying and shaping;
wherein, the volume ratio of the hydrophobizing agent to the deionized water is (10-40): 100, padding time is 10-120 s; the shaping temperature is 130-180 ℃ and the shaping time is 1-10 min.
As a further preferred aspect, the volume ratio of the hydrophobizing agent to deionized water is (20-40): 100, the padding time is 20-120 s.
Preferably, the fabric has a grammage of 366g/m 2 。
In the step (2) of the preparation method:
preferably, the PVC slurry is prepared from the following components in parts by weight:
80 to 100 parts of PVC paste resin
55-80 parts of plasticizer
2-4 parts of heat stabilizer
0.01 to 3 portions of composite cross-linking agent.
The preparation of the PVC sizing agent comprises the following steps: and uniformly stirring and mixing the PVC paste resin, the plasticizer, the heat stabilizer and the composite cross-linking agent.
As a further preference, the PVC slurry is prepared from the following components in parts by weight:
PVC paste resin 100 parts
55-80 parts of plasticizer
2-4 parts of heat stabilizer
0.01 to 3 portions of composite cross-linking agent.
More preferably, the amount of the composite crosslinking agent added is 0.1 to 3 parts per 100 parts of the PVC paste resin.
Preferably, the composite cross-linking agent comprises a main cross-linking agent and a secondary cross-linking agent; wherein the main crosslinking agent is a sulfhydryl silane coupling agent, and the auxiliary crosslinking agent is peroxide.
As a further preference, the primary crosslinking agent is selected from one or more of (3-mercaptopropyl) trimethoxysilane, (3-mercaptopropyl) triethoxysilane, 3-mercaptopropyl (dimethoxy) monosilane. Still more preferably, one or two selected from (3-mercaptopropyl) trimethoxysilane and (3-mercaptopropyl) triethoxysilane.
As a further preference, the co-crosslinking agent is selected from one or more of tert-butylbenzene peroxide, dicumyl peroxide, di-tert-butyldiisopropylbenzene peroxide. Still more preferably, the catalyst is one or two selected from dicumyl peroxide and di-tert-butyl diisopropylbenzene peroxide.
As a further preferred aspect, in the composite crosslinking agent, the mass ratio of the main crosslinking agent to the auxiliary crosslinking agent is 1: (0.01-2). Further preferably 1: (0.1-1.5). Still more preferably 1: (0.5-1.2).
Preferably, the plasticizer is one or two of diisononyl phthalate and n-butyl phthalate.
Preferably, the heat stabilizer is a barium-zinc composite stabilizer.
In the step (3) of the preparation method:
preferably, the coating amount is 50 to 150g/m when the front and back surfaces of the fabric are coated 2 。
Specifically, the front and back surfaces of the fabric are respectively coated with PVC sizing agent in a roller coating mode, and the coating amount is 50-150 g/m 2 。
Preferably, plasticizing molding comprises pre-drying and plasticizing, wherein the pre-drying temperature is 120-150 ℃ and the pre-drying time is 2-10 min; plasticizing temperature is 160-200 ℃ and plasticizing time is 3-8 min.
Further preferably, the pre-baking temperature is 120 to 140 ℃, and the pre-baking temperature is preferably 3 to 10 minutes.
More preferably, the plasticizing temperature is 160 to 190 ℃ and the plasticizing time is 3 to 5 minutes.
According to the preparation method, a hydrophobic agent is adopted to carry out hydrophobic treatment on the fabric, and then PVC slurry is coated to prepare the PVC building membrane structural material; adding a composite cross-linking agent which takes a sulfhydryl silane coupling agent as a main cross-linking agent and peroxide as an auxiliary cross-linking agent into PVC slurry; the main component of the hydrophobing agent is fluorine-containing acrylic ester copolymer containing active groups, and in a damp and hot environment, active free radicals generated by the auxiliary crosslinking agent enable the fluorine-containing acrylic ester segmented copolymer to generate active free radicals (such as C=C, OH and the like), so that the fluorine-containing acrylic ester segmented copolymer and active free radicals (such as sulfenyl, silicon hydroxyl and the like) generated by the main crosslinking agent after hydrolysis in the PVC coating undergo multiple crosslinking reaction, and finally a stable covalent crosslinking network is formed between the PVC and the polyester fiber, thereby reducing the mechanical property loss of the building membrane structural material caused by damp and hot aging.
A wet heat aging resistant PVC building film structural material is prepared by the preparation method of any one of the above. The PVC building film structural material has excellent wet heat aging resistance.
Compared with the prior art, the invention has the beneficial effects that:
according to the preparation method of the wet heat aging resistant PVC building film structural material, the fabric is subjected to hydrophobic treatment by adopting the fluorine-containing acrylate block copolymer, and meanwhile, a composite cross-linking agent consisting of a sulfhydryl silane coupling agent and peroxide is added into the coated PVC slurry, so that the wet heat aging resistant PVC building film structural material is prepared; the PVC film structural material prepared by the preparation method disclosed by the invention has more excellent air tightness and hydrophobic property.
In a damp and hot environment, the fluorine-containing segmented copolymer with active groups (-OH and C=C) is easy to activate through an auxiliary crosslinking agent and rapidly reacts with a main crosslinking agent in the PVC coating in a crosslinking way, so that a crosslinked network structure is formed at the interface of the fiber and the PVC resin, and the peeling performance is effectively enhanced while the tensile strength loss of a product is reduced; the preparation process has simple steps and high product applicability, and the processed product has excellent wet heat aging resistance.
In addition, the PVC sizing agent is in a compact structure formed on the surface of the fabric through molecular entanglement and crosslinking, so that the diffusion of moisture in the composite material can be reduced to a certain extent, the wicking effect caused by capillary action among fabric fibers is effectively reduced, and the mechanical loss of the product caused by damp-heat conditions is reduced.
Drawings
FIG. 1 is an electron microscope image of the surface of a fabric after dissolution of PVC in solvent (THF) of the 6# film structure material of example 1; it is obvious from the figure that the surface is smoother, which indicates that the PVC resin and the fabric have no crosslinking effect at the moment;
FIG. 2 is an electron microscopic image of the surface of a fabric after PVC is dissolved by solvent (THF) after the 6# film structure material of example 1 is subjected to wet heat aging; from the figure, it can be seen that an organic film appears on the surface, which shows that the PVC resin and the fabric have crosslinking effect through the damp-heat aging effect; a large number of organic films are present.
Detailed Description
The base fabrics used in the following examples and comparative examples all selected 2000d x 2600d polyester plain weave fabric with a grammage of 366 g/square meter as the base fabric;
the PVC paste resin used was CPM-31.
Example 1: selection of proportion of main crosslinking agent and auxiliary crosslinking agent in composite crosslinking agent
1. The base cloth hydrophobic treatment process comprises the following specific steps:
immersing the base fabric in a tank for padding, wherein the dipping solution in the tank consists of deionized water and a hydrophobing agent, the volume ratio of the deionized water to the hydrophobing agent is 100:25, the hydrophobing agent component TG5673 is immersed for 20 seconds, and then taken out and put into an oven for shaping, the shaping temperature is 170 ℃, and the shaping time is 2 minutes;
2. the preparation of the PVC sizing agent comprises the following specific steps:
the formula of the PVC sizing agent is as follows: 100g of PVC paste resin, 60g of plasticizer DINP, 3g of barium-zinc stabilizer and 1.5g of composite cross-linking agent, and stirring for later use;
wherein the mass of the (3-mercaptopropyl) trimethoxysilane and dicumyl peroxide in the composite cross-linking agent is 1:0, 1:0.1, 1:0.3, 1:0.5, 1:0.8, 1:1 and 0:1 respectively, 7 parts of different PVC slurries are prepared and respectively marked as 1#, 2#, 3#, 4#, 5#, 6# and 7# slurries;
3. the composite processing specific steps of the base cloth and the PVC sizing agent are as follows:
by treating the base cloth treated in step 1The front surface is coated with the PVC sizing agent prepared in the step 2 in a roller coating mode, and the coating amount is 100g/m 2 Coating the other side of the base cloth with the PVC slurry obtained in the step 2 in a roll coating mode, wherein the coating amount is 100g/m 2 And (3) pre-baking at 140 ℃ for 3min, plasticizing at 180 ℃ for 5min, and cooling to obtain 7 parts of corresponding PVC building film structural materials which are respectively marked as No. 1, no. 2, no. 3, no. 4, no. 5, no. 6 and No. 7 film structural materials.
Respectively taking two parts of 6# membrane structural materials, carrying out a wet heat aging resistance experiment (drying a sample to constant weight, then adding the sample into distilled water at 70 ℃ for a week of the wet heat aging acceleration experiment), dissolving PVC matrixes in the two parts of 6# membrane structural materials respectively by using a THF solvent after finishing, and then placing the two parts of 6# membrane structural materials under an electron microscope to observe the surface morphology of the fabric; fig. 1 is an SEM image of a PET fabric surface that has not been wet heat aged, and fig. 2 is an SEM image of a wet heat aged fabric surface.
As is evident from fig. 1, the surface is smoother, which indicates that there is no crosslinking between the PVC resin and the PET fabric at this time; as can be seen from fig. 2, a layer of organic film appears on the surface of the fabric, which is probably because the composite cross-linking agent performs cross-linking reaction with the PVC resin and the hydrophobic agent on the fabric respectively through the effect of thermal aging, so that THF cannot be dissolved and the cross-linked substance is washed away, and further, a large amount of organic film appears on the surface of the fabric can be obviously observed under an electron microscope.
Example 2:
1. the base cloth hydrophobic treatment process comprises the following specific steps:
immersing the base fabric in a tank for padding, wherein the dipping solution in the tank consists of deionized water and a hydrophobing agent, the volume ratio of the deionized water to the hydrophobing agent is 100:25, the hydrophobing agent component TG5673 is immersed for 20 seconds, and then taken out and put into an oven for shaping, the shaping temperature is 170 ℃, and the shaping time is 2 minutes;
2. the preparation of the PVC sizing agent comprises the following specific steps:
the formula of the PVC sizing agent is as follows: 100g of PVC paste resin, 60g of plasticizer DINP, 3g of barium zinc stabilizer, 1g of composite cross-linking agent, and stirring to obtain PVC slurry for later use, which is respectively marked as 8#.
Wherein the mass of the (3-mercaptopropyl) trimethoxysilane and dicumyl peroxide in the composite cross-linking agent is 1:1 respectively;
3. the composite processing specific steps of the base cloth and the PVC sizing agent are as follows:
the PVC sizing agent prepared in the step 2 is coated on the front surface of the base cloth treated in the step 1 in a roller coating mode, wherein the coating amount is 100g/m 2 Coating the other side of the base cloth with the PVC slurry obtained in the step 2 in a roll coating mode, wherein the coating amount is 100g/m 2 Plasticizing at 180 ℃ for 5min after pre-baking at 140 ℃ for 3min, and cooling to obtain 5 parts of corresponding PVC building film structural materials which are respectively marked as 8# building film structural materials.
Comparative example 1: without hydrophobic treatment
1. The base cloth hydrophobic treatment process comprises the following specific steps:
immersing the base cloth in a tank for padding, wherein the dipping solution in the tank is deionized water, taking out the base cloth after dipping for 20s, and putting the base cloth in an oven for shaping, wherein the shaping temperature is 170 ℃, and the shaping time is 2min;
2. the preparation of the PVC sizing agent comprises the following specific steps:
the PVC slurry comprises the following components in parts by weight: 100g of PVC paste resin, 60g of plasticizer DINP, 3g of barium-zinc stabilizer and 1.5g of composite cross-linking agent, and stirring for later use;
wherein the mass of (3-mercaptopropyl) trimethoxy silane and dicumyl peroxide in the composite cross-linking agent is 1:1 respectively, and PVC slurry is prepared and is respectively recorded as 9# slurry;
3. the composite processing specific steps of the base cloth and the PVC sizing agent are as follows:
the PVC sizing agent prepared in the step 2 is coated on the front surface of the base cloth treated in the step 1 in a roller coating mode, wherein the coating amount is 100g/m 2 Coating the other side of the base cloth with the PVC slurry obtained in the step 2 in a roll coating mode, wherein the coating amount is 100g/m 2 And (3) pre-baking at 140 ℃ for 3min, plasticizing at 180 ℃ for 5min, and cooling to obtain the PVC building film structural material, wherein the PVC building film structural material is respectively marked as a 9# film structural material.
Comparative example 2: no composite cross-linking agent is added
1. The base cloth hydrophobic treatment process comprises the following specific steps:
immersing the base fabric in a tank for padding, wherein the dipping solution in the tank consists of deionized water and a hydrophobing agent, the volume ratio of the deionized water to the hydrophobing agent is 100:25, the hydrophobing agent component TG5673 is immersed for 20 seconds, and then taken out and put into an oven for shaping, the shaping temperature is 170 ℃, and the shaping time is 2 minutes;
2. the preparation of the PVC sizing agent comprises the following specific steps:
the PVC slurry comprises the following components in parts by weight: 100g of PVC paste resin, 60g of plasticizer DINP, 3g of barium-zinc stabilizer, 0g of composite cross-linking agent, and stirring to obtain 10# PVC slurry for later use.
3. The composite processing specific steps of the base cloth and the PVC sizing agent are as follows:
the PVC sizing agent prepared in the step 2 is coated on the front surface of the base cloth treated in the step 1 in a roller coating mode, wherein the coating amount is 100g/m 2 Coating the other side of the base cloth with the PVC slurry obtained in the step 2 in a roll coating mode, wherein the coating amount is 100g/m 2 Plasticizing at 180 ℃ for 5min after pre-baking at 140 ℃ for 3min, and cooling to obtain the 10#PVC building film structural material.
Performance test:
the 8 parts of the film structural materials prepared in examples 1 and 2 and the 9# and 10# film structural materials prepared in comparative examples 1 and 2 were respectively tested for mechanical properties (tensile strength and peel strength) before and after the wet heat aging treatment, and the loss rates of the mechanical properties of the respective film structural materials after the wet heat aging treatment were calculated, and the results are shown in table 1.
The specific operation of the wet heat aging treatment is as follows:
the samples were dried to constant weight, then added to distilled water at 70 ℃ for a damp heat aging acceleration experiment, taken out after one week, and subjected to subsequent performance tests.
Tensile strength test method: GB/T3923.1-2013 determination of the tensile Property of textile fabrics part 1 breaking Strength and elongation at break (strip method).
Peel strength test method: FZ/T60039-2013 method of testing peel strength of coated fabrics for film constructions.
TABLE 1 results of Performance test of the film structural materials prepared in examples 1 to 2 and comparative examples 1 to 2
As can be seen from table 1, the mechanical properties (tensile strength, peel strength) of the 7 membrane structural materials in example 1 are better than those of comparative example 1, which demonstrates the importance of the hydrophobic treatment in the preparation of the membrane structural materials, as compared to comparative example 1.
The tensile properties and peel strength of the 3# to 6# film structural materials in example 1 are better than those of comparative example 2, while the tensile strengths of the 1#, 2# and 7# film structural materials are slightly better than those of comparative example 2, but the peel strength is worse than that of comparative example 2. This is probably because the auxiliary cross-linking agent can generate active free radicals in a damp-heat environment, so as to excite the hydrophobing agent to generate active free radicals and the active free radicals generated after the hydrolysis of the main cross-linking agent to generate multiple cross-linking reactions, and a stable cross-linking network is formed between the PVC and the fabric, so that the mechanical loss of the PVC film structural material in the damp-heat environment is reduced. The content of the auxiliary cross-linking agent in the composite cross-linking agent used for the 3# to 6# membrane structural material is gradually increased, and the hydrophobic agent and the main cross-linking agent can be promoted to perform cross-linking reaction better in a damp-heat environment, so that the damp-heat aging resistance of the membrane structural material is effectively improved. However, the cross-linking agent added in the 1# and 7# membrane structural materials is a single cross-linking agent (main cross-linking agent or auxiliary cross-linking agent) and cannot be subjected to cross-linking reaction with the hydrophobic agent under the damp and hot condition to form a network structure, the connection between PVC and the fabric is poor, and the cross-linking agent has certain water absorption, so that the mechanical property (particularly the stripping property) is seriously reduced; in the 2# membrane structure material, although the composite cross-linking agent (main cross-linking agent and auxiliary cross-linking agent) is added, the addition amount of the auxiliary cross-linking agent is small, and the main cross-linking agent and the hydrophobic agent can not generate good cross-linking reaction.
The peel strength of the 5# and 6# film structural materials is not lost, but is enhanced, the tensile strength loss is basically negligible, and the PVC film structural materials have excellent wet heat aging resistance by selecting the proportion of the main crosslinking agent to the auxiliary crosslinking agent with proper proportion.
Compared with the film structure material using the main crosslinking agent (1#) or the main crosslinking agent (7#), the loss of mechanical properties (tensile strength and peeling strength) of the film structure material using the composite crosslinking agent is reduced along with the increase of the content of the auxiliary crosslinking agent in the composite crosslinking agent, which is probably because the auxiliary crosslinking agent releases a large amount of active substances in a wet and hot environment, so that the hydrophobic agent and the main crosslinking agent in the PVC generate crosslinking reaction at the interface of the hydrophobic agent and the main crosslinking agent to form an organic network interlocking structure, and the occurrence of layering of fibers and PVC resin is avoided. When the ratio of the main crosslinking agent to the auxiliary crosslinking agent in the composite crosslinking agent is more than 1:0.8, the mechanical property change of the membrane structural material basically tends to be balanced, probably because the active groups in the hydrophobic agent are limited, and when the crosslinking reaction reaches saturation, the reaction tends to be peak; namely, the tensile strength loss rate of the film structural material is less than or equal to 0.1 percent and can be almost ignored; the peel strength of the film structure material is not only not lost but is enhanced by more than 5 percent.
The tensile properties and peel strength of the 8# film structure material prepared in example 2 are slightly inferior to those of the 6# film structure material prepared in example 1, because the amount of the composite cross-linking agent added in the 8# film structure material is small, so that a cross-linked network structure cannot be formed with the hydrophobic agent better, and the mechanical properties of the film structure material are affected.
Claims (10)
1. The preparation method of the wet heat aging resistant PVC building film structural material is characterized by comprising the following steps of:
(1) Performing hydrophobic treatment on the fabric by using a hydrophobic agent;
(2) PVC paste is prepared by taking PVC paste resin, plasticizer, heat stabilizer and composite cross-linking agent as raw materials;
(3) And respectively coating PVC sizing agent on the front side and the back side of the fabric subjected to the hydrophobic treatment, and plasticizing and forming to obtain the wet heat aging resistant PVC building film structural material.
2. The method for preparing a heat and humidity aging resistant PVC building film structural material according to claim 1, wherein in step (1), the hydrophobing agent is a fluoroacrylate block copolymer.
3. The method for preparing the wet heat aging resistant PVC building film structural material according to claim 1, wherein the PVC slurry is prepared from the following components in parts by weight:
80 to 100 parts of PVC paste resin
55-80 parts of plasticizer
2-4 parts of heat stabilizer
0.01 to 3 portions of composite cross-linking agent.
4. The method for preparing the wet heat aging resistant PVC building film structural material according to claim 1, wherein the composite cross-linking agent comprises a main cross-linking agent and an auxiliary cross-linking agent; wherein the main crosslinking agent is a sulfhydryl silane coupling agent, and the auxiliary crosslinking agent is peroxide.
5. The method for preparing the wet heat aging resistant PVC building film structural material according to claim 4, wherein the mass ratio of the main crosslinking agent to the auxiliary crosslinking agent in the composite crosslinking agent is 1: (0.01-2).
6. The method for preparing the wet heat aging resistant PVC building film structural material according to claim 1, wherein the plasticizer is one or two of diisononyl phthalate and n-butyl phthalate;
the heat stabilizer is a barium-zinc composite stabilizer.
7. The method for preparing a heat and humidity aging resistant PVC building film structural material according to claim 1, wherein in the step (3), the coating amount is 50-150 g/m when the front and back surfaces of the fabric are coated 2 。
8. The method for preparing the wet heat aging resistant PVC building film structural material according to claim 1, wherein in the step (1), the specific operation of performing the hydrophobic treatment on the fabric is:
mixing the hydrophobing agent with deionized water, unreeling and immersing the fabric therein, padding, taking out, drying and shaping;
wherein, the volume ratio of the hydrophobizing agent to the deionized water is (10-40): 100, padding time is 10-120 s; the shaping temperature is 130-180 ℃ and the shaping time is 1-10 min.
9. The method for preparing the wet heat aging resistant PVC building film structural material according to claim 1, wherein in the step (3), plasticizing molding comprises pre-baking and plasticizing, wherein the pre-baking temperature is 120-150 ℃ and the pre-baking time is 2-10 min; plasticizing temperature is 160-200 ℃ and plasticizing time is 3-8 min.
10. A wet heat aging resistant PVC building film structural material, characterized in that it is prepared by the preparation method of any one of claims 1 to 9.
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| CN202310013501.2A CN117211082A (en) | 2023-01-05 | 2023-01-05 | Humidity-resistant heat-aging-resistant PVC building film structural material and preparation method thereof |
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