CN111154198A - Low-migration modified polyvinyl chloride and preparation method thereof - Google Patents
Low-migration modified polyvinyl chloride and preparation method thereof Download PDFInfo
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- CN111154198A CN111154198A CN201911417382.7A CN201911417382A CN111154198A CN 111154198 A CN111154198 A CN 111154198A CN 201911417382 A CN201911417382 A CN 201911417382A CN 111154198 A CN111154198 A CN 111154198A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0023—Use of organic additives containing oxygen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
- C08J9/0071—Nanosized fillers, i.e. having at least one dimension below 100 nanometers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2327/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2327/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2327/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
- C08J2327/06—Homopolymers or copolymers of vinyl chloride
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2403/00—Characterised by the use of starch, amylose or amylopectin or of their derivatives or degradation products
- C08J2403/02—Starch; Degradation products thereof, e.g. dextrin
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2427/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers
- C08J2427/02—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment
- C08J2427/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Derivatives of such polymers not modified by chemical after-treatment containing chlorine atoms
Abstract
The invention discloses low-migration modified polyvinyl chloride and a preparation method thereof, wherein the low-migration modified polyvinyl chloride comprises the following raw materials in parts by weight: 60-70 parts of polyvinyl chloride resin, 5-7 parts of polychloropropene resin, 2-3 parts of plasticizer, 0.2-0.5 part of stabilizer, 0.3-0.5 part of foaming agent and assistant0.4 to 0.7 portion of agent, 0.1 to 0.6 portion of colorant, 1.2 to 1.5 portions of starch, 1.1 to 1.4 portions of nano calcium and 0.5 to 0.7 portion of metal oxide; wherein: ultraviolet transmittance of less than 3% and impact strength of more than 21KJ/m2And the migration rate of the plasticizer is less than 4 percent. The added starch is used as a natural high molecular material, has good binding capacity with the plasticizer, belongs to a macromolecular compound, has small molecular weight, can completely wrap the polyvinyl chloride resin with small molecular weight when in reaction, and has the function of blocking the migration of the plasticizer due to the winding of molecular chains of the starch to limit the movement of the molecular chains of the plasticizer.
Description
Technical Field
The invention belongs to the technical field of polyvinyl chloride materials, and particularly relates to low-migration modified polyvinyl chloride and a preparation method thereof.
Background
Polyvinyl chloride is an initiator of vinyl chloride monomer in peroxide, azo compounds and the like; or a polymer polymerized by a free radical polymerization mechanism under the action of light and heat. White powder with an amorphous structure has small branching degree, the relative density is about 1.4, the glass transition temperature is 77-90 ℃, the white powder starts to decompose at about 170 ℃, the stability to light and heat is poor, the white powder can be decomposed to generate hydrogen chloride at more than 100 ℃ or after long-time sunshine solarization, the hydrogen chloride is further decomposed automatically to catalyze and decompose, the color change is caused, the physical and mechanical properties are also reduced rapidly, and a stabilizer must be added in practical application to improve the stability to heat and light. The product has wide application in building materials, industrial products, daily necessities, floor leathers, floor tiles, artificial leathers, pipes, wires and cables, packaging films, bottles, foaming materials, sealing materials, fibers and the like.
However, polyvinyl chloride has a problem of poor thermal stability and light resistance during actual use, and some components in the colorant may promote degradation of the resin depending on the content of the plasticizer. Such as iron ions and zinc ions, are catalysts for the degradation reaction of PVC resin. Certain colorants may interact with degradation products of the PVC resin. Meanwhile, metal ions in the colorant can interact with hydrogen chloride generated by the decomposition of PVC to lose the required color, thereby affecting the aesthetic property of the molded product.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a low-mobility modified polyvinyl chloride and a preparation method thereof, and solves the technical problem of low mobility of polyvinyl chloride in the prior art.
The purpose of the invention can be realized by the following technical scheme:
the low-migration modified polyvinyl chloride comprises the following raw materials in parts by weight: 60-70 parts of polyvinyl chloride resin, 5-7 parts of polychloropropylene resin, 2-3 parts of plasticizer, 0.2-0.5 part of stabilizer, 0.3-0.5 part of foaming agent, 0.4-0.7 part of auxiliary agent, 0.1-0.6 part of colorant, 1.2-1.5 parts of starch, 1.1-1.4 parts of nano calcium and 0.5-0.7 part of metal oxide;
wherein: the polymerization degree of the polyvinyl chloride resin is 4000-5000, and the polymerization degree of the polyvinyl chloride-propylene resin is 2000-3000;
and has an ultraviolet transmittance of less than 3% and an impact strength of greater than 21KJ/m2And the migration rate of the plasticizer is less than 4 percent.
Furthermore, the plasticizer in the raw materials is prepared by mixing di (2-ethylhexyl) phthalate, dioctyl phthalate and diisononyl phthalate according to the weight part ratio of 3:1: 1.
Further, the auxiliary agent is acrylic acid.
Further, the metal oxide is manganese dioxide.
The preparation method of the low-migration modified polyvinyl chloride comprises the following steps:
s1, weighing polyvinyl chloride resin and polyvinyl chloride propylene resin according to the parts by weight, putting the polyvinyl chloride resin and the polyvinyl chloride propylene resin into a stirrer for mixing, heating to 55 ℃, adding a plasticizer for mixing and stirring for 10-20min to obtain mixed resin;
s2, heating the mixed resin to 120-125 ℃, adding a stabilizer, a foaming agent, an auxiliary agent, a colorant, starch, nano calcium and a metal oxide according to the parts by weight, and uniformly stirring for 1-2h to obtain a mixture;
s3, placing the mixture in an internal mixer for mixing at the temperature of 140 ℃ and 148 ℃ for 2-3h to obtain a polyvinyl chloride primary blank;
s4, placing the polyvinyl chloride primary blank into a two-roll open mill for mixing and plasticizing, wherein the temperature of the two-roll open mill is 165 ℃, and obtaining a secondary polyvinyl chloride blank;
s5, filtering the secondary polyvinyl chloride blank in a filter while the secondary polyvinyl chloride blank is hot, removing impurity particles, extruding, cooling and forming to obtain the purified modified polyvinyl chloride.
Further, nitrogen is introduced to protect the raw materials and isolate the external air during the mixing and plasticizing processes of S3 and S4.
Further, in the step S5, the temperature of the filter body is 145 ℃, and the temperature of the filter head is 130 ℃.
Furthermore, the rotating speed of the filter in the S5 is controlled to be 30-35 r/min.
Further, the low-migration modified polyvinyl chloride in S5 is applied to the field of building pipe materials.
The invention has the beneficial effects that:
1. the polyvinyl chloride resin is used as a raw material component in the raw material provided by the invention, the added starch is used as a natural high molecular material, the raw material has good binding capacity with the plasticizer, the starch belongs to a macromolecular compound, the molecular weight of the polyvinyl chloride resin is small, the polyvinyl chloride resin with the small molecular weight can be completely wrapped during reaction, and the winding of the molecular chain of the starch limits the movement of the molecular chain of the plasticizer, so that the plasticizer migration blocking effect is achieved.
2. The nanometer calcium can delay the volatilization of the plasticizer, limit the movement of the molecular chain of the plasticizer and play a role in blocking.
3. The addition of manganese dioxide metal oxide can inhibit the self-accelerating reaction in the dehydrochlorination of polyvinyl chloride finished products, and reduce the volatilization rate of hydrogen chloride, and the reduction reaction between the hydrogen chloride and the metal oxide in the colorant is further reduced when the volatilization of the hydrogen chloride is inhibited, so that the coloring efficiency of the colorant is improved, and the service durability of the colorant is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the embodiment provides a low-migration modified polyvinyl chloride, which comprises the following raw materials in parts by weight: 65g of polyvinyl chloride resin, 6g of polychloropropene resin, 3g of plasticizer, 0.5g of stabilizer, 0.5g of foaming agent, 0.5g of auxiliary agent, 0.6g of colorant, 1.4g of starch, 1.4g of nano calcium and 0.7g of metal oxide; wherein: the plasticizer in the raw materials is prepared by mixing di (2-ethylhexyl) phthalate, dioctyl phthalate and diisononyl phthalate according to the weight g ratio of 3:1:1, the auxiliary agent is acrylic acid, and the metal oxide is manganese dioxide.
The polymerization degree of the polyvinyl chloride resin is 4000-5000, and the polymerization degree of the polyvinyl chloride-propylene resin is 2000-3000;
and has an ultraviolet transmittance of 2.3% and an impact strength of 20.8KJ/m2And the plasticizer migration rate is equal to 3.4% (the detection data is obtained by standing for 144h under the temperature environment of 70 ℃).
The preparation method of the low-migration modified polyvinyl chloride comprises the following steps:
s1, weighing polyvinyl chloride resin and polyvinyl chloride propylene resin according to weight g, putting into a stirrer for mixing, heating to 55 ℃, adding plasticizer for mixing and stirring for 10-20min to obtain mixed resin;
s2, heating the mixed resin to 120-125 ℃, adding a stabilizer, a foaming agent, an auxiliary agent, a colorant, starch, nano calcium and a metal oxide according to the weight g, and uniformly stirring for 1-2h to obtain a mixture;
s3, placing the mixture in an internal mixer for mixing at the temperature of 140 ℃ and 148 ℃ for 2-3h to obtain a polyvinyl chloride primary blank;
s4, placing the polyvinyl chloride primary blank into a two-roll open mill for mixing and plasticizing, wherein the temperature of the two-roll open mill is 165 ℃, and obtaining a secondary polyvinyl chloride blank;
s5, filtering the secondary polyvinyl chloride blank in a filter while the secondary polyvinyl chloride blank is hot, controlling the temperature of a filter body to be 145 ℃, the temperature of a filter head to be 130 ℃, controlling the rotating speed of the filter to be 30-35r/min to remove impurity particles, extruding, cooling and forming to obtain the purified modified polyvinyl chloride.
And meanwhile, nitrogen is introduced to protect the raw materials in the processes of mixing and plasticizing of S3 and S4, so that the external air is isolated, the external air is reduced to oxidize the raw material products, and the forming rate of the starch-coated polyvinyl chloride is improved, so that the polyvinyl chloride attached with the plasticizer is enhanced.
The low-migration modified polyvinyl chloride is applied to the field of building pipe materials.
Example 2:
the embodiment provides a low-migration modified polyvinyl chloride, which comprises the following raw materials in parts by weight: 67g of polyvinyl chloride resin, 5g of polychloropropene resin, 2g of plasticizer, 0.4g of stabilizer, 0.3g of foaming agent, 0.4g of auxiliary agent, 0.6g of colorant, 1.4g of starch, 1.2g of nano calcium and 0.7g of metal oxide;
wherein: the plasticizer in the raw materials is prepared by mixing di (2-ethylhexyl) phthalate, dioctyl phthalate and diisononyl phthalate according to the weight g ratio of 3:1:1, the auxiliary agent is acrylic acid, and the metal oxide is manganese dioxide. The polymerization degree of the polyvinyl chloride resin is 4000-5000, and the polymerization degree of the polyvinyl chloride-propylene resin is 2000-3000;
and has an ultraviolet transmittance of 2.1% and an impact strength of 20.6KJ/m2The plasticizer migration rate is equal to 4.1%.
The modified polyvinyl chloride having low migration was prepared in the same manner as in example 1.
Example 3:
the embodiment provides a low-migration modified polyvinyl chloride, which comprises the following raw materials in parts by weight: 63g of polyvinyl chloride resin, 5g of polychloropropene resin, 2-3g of plasticizer, 0.5g of stabilizer, 0.4g of foaming agent, 0.7g of auxiliary agent, 0.5g of colorant, 1.3g of starch, 1.3g of nano calcium and 0.6g of metal oxide;
wherein: the plasticizer in the raw materials is prepared by mixing di (2-ethylhexyl) phthalate, dioctyl phthalate and diisononyl phthalate according to the weight g ratio of 3:1:1, the auxiliary agent is acrylic acid, and the metal oxide is manganese dioxide. The polymerization degree of the polyvinyl chloride resin is 4000-5000, and the polymerization degree of the polyvinyl chloride-propylene resin is 2000-3000;
and has an ultraviolet transmittance of 2.8% and an impact strength of 19.8KJ/m2The migration rate of the plasticizer is equal to 3.7 percent.
The modified polyvinyl chloride having low migration was prepared in the same manner as in example 1.
Example 4:
the embodiment provides a low-migration modified polyvinyl chloride, which comprises the following raw materials in parts by weight: 60g of polyvinyl chloride resin, 7g of polychloropropene resin, 3g of plasticizer, 0.5g of stabilizer, 0.4g of foaming agent, 0.7g of auxiliary agent, 0.2g of colorant, 1.2g of starch, 1.1g of nano calcium and 0.6g of metal oxide;
wherein: the plasticizer in the raw materials is prepared by mixing di (2-ethylhexyl) phthalate, dioctyl phthalate and diisononyl phthalate according to the weight g ratio of 3:1:1, the auxiliary agent is acrylic acid, and the metal oxide is manganese dioxide. The polymerization degree of the polyvinyl chloride resin is 4000-5000, and the polymerization degree of the polyvinyl chloride-propylene resin is 2000-3000;
and has an ultraviolet transmittance of 2.6% and an impact strength of 20.3KJ/m2The migration rate of the plasticizer is equal to 3.8 percent.
The modified polyvinyl chloride having low migration was prepared in the same manner as in example 1.
Example 5:
the embodiment provides a low-migration modified polyvinyl chloride, which comprises the following raw materials in parts by weight: 70g of polyvinyl chloride resin, 7g of polychloropropene resin, 2g of plasticizer, 0.3g of stabilizer, 0.5g of foaming agent, 0.6g of auxiliary agent, 0.4g of colorant, 1.5g of starch, 1.1g of nano calcium and 0.5g of metal oxide;
wherein: the plasticizer in the raw materials is prepared by mixing di (2-ethylhexyl) phthalate, dioctyl phthalate and diisononyl phthalate according to the weight g ratio of 3:1:1, the auxiliary agent is acrylic acid, and the metal oxide is manganese dioxide. The polymerization degree of the polyvinyl chloride resin is 4000-5000, and the polymerization degree of the polyvinyl chloride-propylene resin is 2000-3000;
and has an ultraviolet transmittance of 3% and an impact strength of 20.7KJ/m2The migration rate of the plasticizer is equal to 3.8 percent.
The modified polyvinyl chloride having low migration was prepared in the same manner as in example 1.
Comparative example: the method selects the polyvinyl chloride rubber tube normally sold in the market, and the detected information is as follows: ultraviolet transmittance of 5.3%, and impact strength of more than 29.7KJ/m2The migration rate of the plasticizer is equal to 8.8 percent.
In summary, the raw material provided by the invention uses polyvinyl chloride resin as a raw material component, and the added starch is used as a natural polymer material, so that the raw material has good binding capacity with the plasticizer, the starch belongs to a macromolecular compound, the molecular weight of the polyvinyl chloride resin is small, the polyvinyl chloride resin with the small molecular weight can be completely wrapped when the reaction is carried out, and the winding of the molecular chain of the starch limits the movement of the molecular chain of the plasticizer, so that the plasticizer migration blocking effect is achieved. The addition of manganese dioxide metal oxide can inhibit the self-accelerating reaction in the dehydrochlorination of polyvinyl chloride finished products, and reduce the volatilization rate of hydrogen chloride, and the reduction reaction between the hydrogen chloride and the metal oxide in the colorant is further reduced when the volatilization of the hydrogen chloride is inhibited, so that the coloring efficiency of the colorant is improved, and the service durability of the colorant is improved.
And the ultraviolet transmittance of the formed polyvinyl chloride is reduced, the integral stamping strength is not influenced, and the migration rate of the plasticizer is reduced.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (9)
1. The low-migration modified polyvinyl chloride is characterized by comprising the following raw materials in parts by weight: 60-70 parts of polyvinyl chloride resin, 5-7 parts of polychloropropylene resin, 2-3 parts of plasticizer, 0.2-0.5 part of stabilizer, 0.3-0.5 part of foaming agent, 0.4-0.7 part of auxiliary agent, 0.1-0.6 part of colorant, 1.2-1.5 parts of starch, 1.1-1.4 parts of nano calcium and 0.5-0.7 part of metal oxide;
wherein: the polymerization degree of the polyvinyl chloride resin is 3000-4000, and the polymerization degree of the polyvinyl chloride-propylene resin is 2000-3000;
and has an ultraviolet transmittance of less than 3% and an impact strength of greater than 21KJ/m2And the migration rate of the plasticizer is less than 4 percent.
2. The low migration modified polyvinyl chloride according to claim 1, wherein the plasticizer in the raw material is selected from di (2-ethylhexyl) phthalate, dioctyl phthalate, and diisononyl phthalate, which are mixed in a weight ratio of 3:1: 1.
3. The low migration modified polyvinyl chloride according to claim 1, wherein said auxiliary agent is acrylic acid.
4. The low migration modified polyvinyl chloride according to claim 1, wherein said metal oxide is manganese dioxide.
5. The method for preparing low migration modified polyvinyl chloride according to claim 1, comprising the steps of:
s1, weighing polyvinyl chloride resin and polyvinyl chloride propylene resin according to the parts by weight, putting the polyvinyl chloride resin and the polyvinyl chloride propylene resin into a stirrer for mixing, heating to 55 ℃, adding a plasticizer for mixing and stirring for 10-20min to obtain mixed resin;
s2, heating the mixed resin to 120-125 ℃, adding a stabilizer, a foaming agent, an auxiliary agent, a colorant, starch, nano calcium and a metal oxide according to the parts by weight, and uniformly stirring for 1-2h to obtain a mixture;
s3, placing the mixture in an internal mixer for mixing at the temperature of 140 ℃ and 148 ℃ for 2-3h to obtain a polyvinyl chloride primary blank;
s4, placing the polyvinyl chloride primary blank into a two-roll open mill for mixing and plasticizing, wherein the temperature of the two-roll open mill is 165 ℃, and obtaining a secondary polyvinyl chloride blank;
s5, filtering the secondary polyvinyl chloride blank in a filter while the secondary polyvinyl chloride blank is hot, removing impurity particles, extruding, cooling and forming to obtain the purified modified polyvinyl chloride.
6. The method for preparing low migration modified polyvinyl chloride as claimed in claim 5, wherein nitrogen is introduced during the mixing and plasticizing processes of S3 and S4 to protect the raw materials from the outside air.
7. The method for preparing low migration modified polyvinyl chloride according to claim 5, wherein the temperature of the filter body in S5 is 145 ℃ and the temperature of the filter head is 130 ℃.
8. The method for preparing low migration modified polyvinyl chloride according to claim 5, wherein the rotation speed of the filter in S5 is controlled to be 30-35 r/min.
9. The method for preparing low-migration modified polyvinyl chloride according to claim 5, wherein the low-migration modified polyvinyl chloride in S5 is applied to the field of building pipe materials.
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| CN201911417382.7A CN111154198A (en) | 2019-12-31 | 2019-12-31 | Low-migration modified polyvinyl chloride and preparation method thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1365230A (en) * | 1971-06-24 | 1974-08-29 | Scott Paper Co | Soft absorbent fibrous sheet material and a method for making same |
| CN107573617A (en) * | 2017-09-28 | 2018-01-12 | 安徽炳辰吸塑有限公司 | A kind of PVC plastic pipe |
-
2019
- 2019-12-31 CN CN201911417382.7A patent/CN111154198A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1365230A (en) * | 1971-06-24 | 1974-08-29 | Scott Paper Co | Soft absorbent fibrous sheet material and a method for making same |
| CN107573617A (en) * | 2017-09-28 | 2018-01-12 | 安徽炳辰吸塑有限公司 | A kind of PVC plastic pipe |
Non-Patent Citations (1)
| Title |
|---|
| 朱新生等: "金属氧化物对聚氯乙烯热降解性能的影响", 《华东理工大学学报》 * |
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Application publication date: 20200515 |