CN116199990A - High-density rigid crosslinked polyvinyl chloride foam and preparation method thereof - Google Patents
High-density rigid crosslinked polyvinyl chloride foam and preparation method thereof Download PDFInfo
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- 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
- C08J9/06—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 by a chemical blowing agent
- C08J9/10—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 by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
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Abstract
The invention belongs to the technical field of rigid cross-linked polyvinyl chloride foam, and particularly relates to high-density rigid cross-linked polyvinyl chloride foam and a preparation method thereof. The invention relates to a high-density hard crosslinked polyvinyl chloride foam, which comprises the following raw materials in parts by weight: 500-650 parts of polyvinyl chloride, 10-50 parts of foaming agent, 255-450 parts of isocyanate, 5-50 parts of curing agent, 1-10 parts of surfactant and 1-30 parts of heat stabilizer. According to the high-density hard crosslinked polyvinyl chloride foam and the preparation method thereof, the curing process is improved by increasing the temperature and adopting a spraying mode, the production period is shortened to 25-30 days, the production efficiency is improved, and the production cost is reduced; adjusting the formula components and proportion, optimizing the stirring and mixing process, and reducing the costLow system viscosity, uniform dispersion of formula components, uniform nucleation, 300Kg/m of the preparation 3 The layering density of the high-density hard crosslinked polyvinyl chloride foam is greatly improved, the problem of holes is effectively improved, and the performance is also effectively improved.
Description
Technical Field
The invention belongs to the technical field of rigid cross-linked polyvinyl chloride foam, and particularly relates to high-density rigid cross-linked polyvinyl chloride foam and a preparation method thereof.
Background
The rigid cross-linked PVC foam material uses polyvinyl chloride resin as a base polymer and carries out network reinforcement through a cross-linked polyurea structure. Because of the characteristics of light weight, high strength and good static dynamic performance of the hard crosslinked PVC foam, the hard crosslinked PVC foam can be used in places with high bearing requirements. After being made into the sandwich composite material, the mechanical property is greatly enhanced, and the composite material is mainly applied to the industries of aerospace, ships and warships, rail transit, wind power generation, building energy conservation and the like.
The foam core material applied to the ocean field not only requires high density, light weight and high strength, but also has the characteristics of good toughness, impact resistance and low water absorption rate because of the special ocean environment, and the crosslinked PVC foam shows good comprehensive performance in the aspects and becomes one of important choices in the ocean field. High-density crosslinked PVC foam is used as a core material for yachts, ferries, special ships and the like, and the yachts, ferries, special ships and the like have higher reliability and longer service life. In addition, the high-density crosslinked PVC foam has good compressive toughness and low water absorption rate, and is also widely used as a buoyancy material of deep-diving equipment.
At present, the production of special high-density crosslinked PVC (polyvinyl chloride) foam products has some difficulties: firstly, the hard crosslinked polyvinyl chloride foam material with high strength, high toughness, high flame retardance, high closed cell rate, high density and low water absorption has the advantages of high production technical difficulty, long production period and about 45-60 days; secondly, the PVC content in the high-density hard crosslinked polyvinyl chloride foam is high, the viscosity of the system is high, the formula components cannot be uniformly dispersed, so that the density uniformity of the PVC polyvinyl chloride foam product is poor, a large number of holes are formed, the performance of the material is affected, and the use requirement of special marine materials cannot be met; thirdly, the size of the cells of the existing high-density polyvinyl chloride foam product is not uniform, so that the mechanical property is poor.
Disclosure of Invention
The invention aims to provide a high-density rigid cross-linked polyvinyl chloride foam and a preparation method thereof.
In order to solve the technical problems, the invention provides a high-density hard crosslinked polyvinyl chloride foam, which comprises the following raw materials in parts by weight: 500-650 parts of polyvinyl chloride, 10-50 parts of foaming agent, 255-450 parts of isocyanate, 5-50 parts of curing agent, 1-10 parts of surfactant and 1-30 parts of heat stabilizer.
Preferably, the polyvinyl chloride is polyvinyl chloride paste resin, and the viscosity of the type B is 3000-4000cps.
Preferably, the isocyanate comprises the following components in percentage by weight: 1 to 1:2 and a second substance; wherein the first material is a modified diphenylmethane diisocyanate or toluene diisocyanate; the second substance is isocyanate methylene polyphenylene ester.
Preferably, the modified diphenylmethane diisocyanate comprises the following components in parts by weight: 50-70 parts of diphenylmethane-4, 4' -diisocyanate; 25-70 parts of carbodiimide modified MDI;1 to 2.5 parts of diphenylmethane-2, 4' -diisocyanate.
Preferably, the curing agent is a mixture of methyl hexahydrophthalic anhydride and hexahydrophthalic anhydride, and the weight ratio of the methyl hexahydrophthalic anhydride to the hexahydrophthalic anhydride is 1:1 to 1:3, a step of; or the curing agent is epoxy resin.
Preferably, the foaming agent is a mixture of modified azodicarbonamide and azodiisobutyronitrile, and the weight ratio of the modified azodicarbonamide to the azodiisobutyronitrile is 1:1 to 1:3, a step of; wherein the modified azodicarbonamide is azodicarbonamide containing 0.1-0.2% of sodium bicarbonate by weight, and the particle size of the mixture is 8-20 micrometers.
Preferably, the surfactant is a silicone polyether copolymer; the heat stabilizer is one of epoxidized soybean oil, zinc stearate and calcium stearate.
Preferably, the high-density hard crosslinked polyvinyl chloride foam comprises the following raw materials in parts by weight: 550-620 parts of polyvinyl chloride, 20-40 parts of foaming agent, 300-400 parts of isocyanate, 10-40 parts of curing agent, 1-5 parts of surfactant and 1-20 parts of heat stabilizer.
Preferably, the high-density hard crosslinked polyvinyl chloride foam comprises the following raw materials in parts by weight: 570-600 parts of polyvinyl chloride, 25-35 parts of foaming agent, 350-370 parts of isocyanate, 10-30 parts of curing agent, 1-2 parts of surfactant and 1-10 parts of heat stabilizer.
In still another aspect, the present invention provides a method for preparing a high density rigid crosslinked polyvinyl chloride foam, comprising:
1) Introducing liquid raw materials of isocyanate, surfactant, heat stabilizer and curing agent into a planetary stirring kettle by using a metering pump, and mixing for 30min at 20-30 ℃ (preferably 25 ℃);
2) Adding the solid powder foaming agent into a stirring kettle, and mixing for 10min at 20-30 ℃;
3) Adding one third of polyvinyl chloride paste resin into a stirring kettle, and mixing for 2min at 20-30 ℃;
4) Adding one third of polyvinyl chloride paste resin into a stirring kettle, and mixing for 2min at 20-30 ℃;
5) Adding one third of polyvinyl chloride paste resin into a stirring kettle, and mixing for 2min at 20-30 ℃;
6) Cleaning the materials which are not fully stirred in the kettle wall, and continuously stirring for 3min at 20-30 ℃;
7) Vacuumizing the stirring kettle to 0.8-1MPa, stirring for 10-20min at the same time, and placing the materials into a die through a bottom discharge valve after no obvious bubbles exist;
8) Placing the die on a flat plate hot plate, pressurizing to 220KG, heating to 171 ℃, and preserving heat for 30min;
cooling to 145 ℃ and keeping for 5 minutes, rapidly reducing the pressure from 220KG to 40KG in no more than 20 seconds, and keeping the pressure until the die is removed; cooling to 35 ℃;
9) Cooling the flat plate hot plate to 25 ℃, releasing pressure, and opening the die to take out the blank;
10 Placing the embryo body into a curing room at 80 ℃, and curing for 25 days by adopting a spray heating mode to obtain the high-density rigid cross-linked polyvinyl chloride foam.
The high-density rigid cross-linked polyvinyl chloride foam and the preparation method thereof have the beneficial effects that the high-density rigid cross-linked polyvinyl chloride foam and the preparation method thereof improve the curing process by increasing the temperature and adopting a spraying mode, shorten the production period to 25-30d, improve the production efficiency and reduce the production cost; adjusting the formula components and proportion, optimizing the stirring and mixing process, reducing the viscosity of the system, enabling the formula components to be uniformly dispersed and nucleated, and preparing 300Kg/m 3 The layering density of the high-density hard crosslinked polyvinyl chloride foam is greatly improved, the problem of holes is effectively improved, and the performance is also effectively improved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is an electron micrograph of a high density rigid crosslinked polyvinyl chloride foam of the invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The starting materials used in the examples are all commercially available.
The inventor finds through research that in the key factors for preparing the high-density rigid cross-linked polyvinyl chloride foam, the first is various components and proportions in the formula, and the requirement has suitability for a process, and the selection of mixing equipment is also involved, so that a viscous mixture is obtained, and the filling of a die is facilitated; the second control factor is the control of the molding stage, mainly temperature and pressure, different formulas often select different temperature and pressure control schemes, so as to achieve gelation of materials and complete decomposition of foaming agents, a very important stage in the preparation stage of the pre-foaming body is temperature reduction and pressure relief, the formation of bubble nuclei is generally formed in the stage, and the size of the final foam cells is determined, and the nucleating agents in the process play a role; thirdly, controlling the temperature and humidity of expansion to obtain an expansion body with a certain density, and completing the hydrolytic crosslinking of isocyanate from the outside to the inside in the presence of moisture to obtain the foam original plate with the required density.
The following are specific preparation examples and comparative examples
Example 1
The formula of the raw materials comprises: 580 parts of PVC paste resin; 180 parts of diphenylmethane diisocyanate, 180 parts of isocyanate methylene polyphenylene ester; 25 parts of curing agent, wherein the curing agent is methyl hexahydrophthalic anhydride: hexahydrophthalic anhydride=3:7; 30 parts of a foaming agent, wherein the modified azodicarbonamide: azobisisobutyronitrile=1:2; 1 part of surfactant and 10 parts of epoxidized soybean oil.
And (3) foaming process:
1) Introducing liquid raw materials of isocyanate, surfactant, heat stabilizer and curing agent into a planetary stirring kettle by using a metering pump, and mixing for 30min at 25 ℃;
2) Adding the solid powder foaming agent into a stirring kettle, and mixing for 10min at 25 ℃;
3) Adding one third of PVC paste resin into a stirring kettle, and mixing for 2min at 25 ℃;
4) Adding one third of PVC paste resin into a stirring kettle, and mixing for 2min at 25 ℃;
5) Adding one third of PVC paste resin into a stirring kettle, and mixing for 2min at 25 ℃;
6) Cleaning the materials which are not fully stirred in the kettle wall, and continuously stirring for 3min at 25 ℃;
7) Vacuumizing the stirring kettle to 0.8-1MPa, stirring for 10-20min at the same time, and placing the materials into a die through a bottom discharge valve after no obvious bubbles exist;
8) Placing the die on a flat plate hot plate, pressurizing to 220KG, raising the temperature to 171 ℃, and preserving the heat for 30 minutes; cooling to 145 ℃ and keeping for 5 minutes, and then reducing the pressure from 220KG to 40KG in 10 seconds, and keeping the pressure until the mold is removed; the cooling process is normal, and the mold is removed at 35 ℃;
9) Cooling the flat plate hot plate to 25 ℃, releasing pressure, and opening the die to take out the blank;
10 Placing the embryo body into a curing room at 80 ℃, and curing for 25 days by adopting a spray heating mode to obtain 300Kg/m 3 Rigid crosslinked polyvinyl chloride foam articles of (c).
Example 2
The formula of the raw materials comprises: 580 parts of PVC paste resin, 180 parts of diphenylmethane diisocyanate and 180 parts of isocyanate methylene polyphenylene ester; 15 parts of curing agent, wherein the curing agent is methyl hexahydrophthalic anhydride: hexahydrophthalic anhydride=3:7; 30 parts of a foaming agent, wherein the modified azodicarbonamide: azobisisobutyronitrile=1:2; 1 part of a surfactant; 10 parts of epoxidized soybean oil.
And (3) foaming process:
1) Introducing liquid raw materials of isocyanate, surfactant, heat stabilizer and curing agent into a planetary stirring kettle by using a metering pump, and mixing for 30min at 25 ℃;
2) Adding the solid powder foaming agent into a stirring kettle, and mixing for 10min at 25 ℃;
3) Adding one third of PVC paste resin into a stirring kettle, and mixing for 2min at 25 ℃;
4) Adding one third of PVC paste resin into a stirring kettle, and mixing for 2min at 25 ℃;
5) Adding one third of PVC paste resin into a stirring kettle, and mixing for 2min at 25 ℃;
6) Cleaning the materials which are not fully stirred in the kettle wall, and continuously stirring for 3min at 25 ℃;
7) Vacuumizing the stirring kettle to 0.8-1MPa, stirring for 10-20min at the same time, and placing the materials into a die through a bottom discharge valve after no obvious bubbles exist;
8) The mold was placed on a flat plate hot plate, pressurized to 220KG, and incubated for 30 minutes after the temperature was raised to 171 ℃. When the temperature is reduced to 145 ℃, after the temperature is kept for 5 minutes, the pressure is reduced from 220KG to 40KG in 10 seconds, and the pressure is kept to the demolding; the cooling process is normal, and the mold is removed at 35 ℃;
9) Cooling the flat plate hot plate to 25 ℃, releasing pressure, and opening the die to take out the blank.
10 Placing the embryo body into a curing room at 80 ℃, and curing for 25 days by adopting a spray heating mode to obtain 300Kg/m 3 Rigid crosslinked polyvinyl chloride foam articles of (c).
Example 3
The formula of the raw materials comprises: 596 parts of PVC paste resin, 147 parts of toluene diisocyanate and 189 parts of isocyanate methylene polyphenylene ester; 25 parts of curing agent, wherein the curing agent is methyl hexahydrophthalic anhydride: hexahydrophthalic anhydride=3:7; 36 parts of a blowing agent, wherein the modified azodicarbonamide: azobisisobutyronitrile=5:7; 1 part of a surfactant; 6 parts of epoxidized soybean oil.
And (3) foaming process:
1) Introducing liquid raw materials of isocyanate, surfactant, heat stabilizer and curing agent into a planetary stirring kettle by using a metering pump, and mixing for 30min at 25 ℃;
2) Adding the solid powder foaming agent into a stirring kettle, and mixing for 10min at 25 ℃;
3) Adding one third of PVC paste resin into a stirring kettle, and mixing for 2min at 25 ℃;
4) Adding one third of PVC paste resin into a stirring kettle, and mixing for 2min at 25 ℃;
5) Adding one third of PVC paste resin into a stirring kettle, and mixing for 2min at 25 ℃;
6) Cleaning the materials which are not fully stirred in the kettle wall, and continuously stirring for 3min at 25 ℃;
7) Vacuumizing the stirring kettle to 0.8-1MPa, stirring for 10-20min at the same time, and placing the materials into a die through a bottom discharge valve after no obvious bubbles exist;
8) Placing the die on a flat plate hot plate, pressurizing to 220KG, raising the temperature to 171 ℃, and preserving the heat for 30 minutes; after the temperature is reduced to 145 ℃ and kept for 5 minutes, the pressure is reduced from 220KG to 40KG in 10 seconds, and the pressure is kept to the demolding; the cooling process is normal, and the mold is removed at 35 ℃;
9) Cooling the flat plate hot plate to 25 ℃, releasing pressure, and opening the die to take out the blank;
10 Placing the embryo body into a curing room at 80 ℃, and curing for 25 days by adopting a spray heating mode to obtain a rigid cross-linked polyvinyl chloride foam product of 300Kg/m 3.
Example 4
The formula of the raw materials comprises: 580 parts of PVC paste resin, 184 parts of diphenylmethane diisocyanate and 184 parts of isocyanate methylene polyphenylene ester; 25 parts of curing agent, wherein the curing agent is methyl hexahydrophthalic anhydride: hexahydrophthalic anhydride=3:7; 19.3 parts of a blowing agent, wherein the modified azodicarbonamide: azobisisobutyronitrile=1:3; 1 part of a surfactant; 8 parts; epoxidized soybean oil; .
And (3) foaming process:
1) Introducing liquid raw materials of isocyanate, surfactant, heat stabilizer and curing agent into a planetary stirring kettle by using a metering pump, and mixing for 30min at 25 ℃;
2) Adding the solid powder foaming agent into a stirring kettle, and mixing for 10min at 25 ℃;
3) Adding one third of PVC paste resin into a stirring kettle, and mixing for 2min at 25 ℃;
4) Adding one third of PVC paste resin into a stirring kettle, and mixing for 2min at 25 ℃;
5) Adding one third of PVC paste resin into a stirring kettle, and mixing for 2min at 25 ℃;
6) Cleaning the materials which are not fully stirred in the kettle wall, and continuously stirring for 3min at 25 ℃;
7) Vacuumizing the stirring kettle to 0.8-1MPa, stirring for 10-20min at the same time, and placing the materials into a die through a bottom discharge valve after no obvious bubbles exist;
8) Placing the die on a flat plate hot plate, pressurizing to 220KG, raising the temperature to 171 ℃, and preserving the heat for 30 minutes; cooling to 145 ℃ and keeping for 5 minutes, and then reducing the pressure from 220KG to 40KG in 10 seconds, and keeping the pressure until the mold is removed; the cooling process is normal, and the mold is removed at 35 ℃;
9) Cooling the flat plate hot plate to 25 ℃, releasing pressure, and opening the die to take out the blank.
10 Placing the embryo body into a curing room at 80 ℃, and curing for 25 days by adopting a spray heating mode to obtain a rigid cross-linked polyvinyl chloride foam product of 300Kg/m 3.
Comparative example 1
The formula of the raw materials comprises: 580 parts of PVC paste resin, 180 parts of diphenylmethane diisocyanate and 180 parts of isocyanate methylene polyphenylene ester; 25 parts of curing agent, wherein the curing agent is methyl hexahydrophthalic anhydride: hexahydrophthalic anhydride=3:7; 30 parts of a foaming agent, wherein the modified azodicarbonamide: azobisisobutyronitrile=0.9:2; 1 part of surfactant (silicone polyether copolymer) and 10 parts of heat stabilizer (epoxidized soybean oil).
And (3) foaming process:
1) Introducing liquid raw materials of isocyanate, surfactant, heat stabilizer and curing agent into a planetary stirring kettle by using a metering pump, and mixing for 30min at 25 ℃;
2) Adding the solid powder foaming agent into a stirring kettle, and mixing for 10min at 25 ℃;
3) Adding PVC paste resin into a stirring kettle, and mixing for 2min at 25 ℃;
4) Cleaning the materials which are not fully stirred in the kettle wall, and continuously stirring for 3min at 25 ℃;
5) Vacuumizing the stirring kettle to 0.8-1MPa, stirring for 10-20min at the same time, and placing the materials into a die through a bottom discharge valve after no obvious bubbles exist;
6) Placing the die on a flat plate hot plate, pressurizing to 220KG, raising the temperature to 171 ℃, and preserving the heat for 30 minutes; cooling to 145 ℃ and keeping for 5 minutes, and then reducing the pressure from 220KG to 40KG in 10 seconds, and keeping the pressure until the mold is removed; the cooling process is normal, and the mold is removed at 35 ℃;
7) Cooling the flat plate hot plate to 25 ℃, releasing pressure, and opening the die to take out the blank;
8) And (3) placing the blank into a curing room at 80 ℃, and curing for 25 days by adopting a spray heating mode to obtain a rigid cross-linked polyvinyl chloride foam product of 300Kg/m 3.
Comparative example 2
The formula of the raw materials comprises: 580 parts of PVC paste resin, 180 parts of diphenylmethane diisocyanate and 180 parts of isocyanate methylene polyphenylene ester; 25 parts of curing agent, wherein the curing agent is methyl hexahydrophthalic anhydride: hexahydrophthalic anhydride=3:7; 30 parts of a foaming agent, wherein the modified azodicarbonamide: mixture of azobisisobutyronitrile = 1:2;1 part of surfactant (silicone polyether copolymer) and 10 parts of heat stabilizer (epoxidized soybean oil).
And (3) foaming process:
1) Introducing liquid raw materials of isocyanate, surfactant, heat stabilizer and curing agent into a planetary stirring kettle by using a metering pump, and mixing for 30min at 25 ℃;
2) Adding the solid powder foaming agent into a stirring kettle, and mixing for 10min at 25 ℃;
3) Adding one third of PVC paste resin into a stirring kettle, and mixing for 2min at 25 ℃;
4) Adding one third of PVC paste resin into a stirring kettle, and mixing for 2min at 25 ℃;
5) Adding one third of PVC paste resin into a stirring kettle, and mixing for 2min at 25 ℃;
6) Cleaning the materials which are not fully stirred in the kettle wall, and continuously stirring for 3min at 25 ℃;
7) Vacuumizing the stirring kettle to 0.8-1MPa, stirring for 10-20min at the same time, and placing the materials into a die through a bottom discharge valve after no obvious bubbles exist;
8) Placing the die on a flat plate hot plate, pressurizing to 220KG, keeping the temperature at 171 ℃ for 30 minutes, cooling to 145 ℃ for 5 minutes, and maintaining the pressure from 220KG to 40KG within 10 seconds until the die is ejected; the cooling process is normal, and the mold is removed at 35 ℃;
9) Cooling the flat plate hot plate to 25 ℃, releasing pressure, and opening the die to take out the blank;
10 Placing the embryo body into a 75 ℃ oven, and curing for 45 days to obtain a rigid cross-linked polyvinyl chloride foam product of 300Kg/m 3.
Performance test and results description
In order to further illustrate the beneficial effects of the present invention, performance tests were conducted on examples 1 to 4 and comparative examples 1 to 2, with the test items: compressive strength, tensile strength, shear strength, water absorption, formulation viscosity, and the like. The measurement results are shown in Table 1.
Compared with comparative example 1, the PVC is added in 3 batches in examples 1-4, so that the viscosity of the system can be reduced, and the dispersibility of the components can be improved; examples 1-4 the cell effect was improved by optimizing the ratio of isocyanate to curing agent in the formulation, and optimizing the mixture ratio of blowing agent.
Compared with comparative example 2, examples 1-4 improved the curing process at 80℃and shortened the production cycle from 45-60d to 25-30d by heating in the curing room with a shower.
TABLE 1
| Performance of | Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 |
| Layered Density (Kg/m) 3 ) | 300-320 | 280-350 | 300-330 | 295-330 | 270-350 | 300-330 |
| Compressive Strength (MPa) | 8.5 | 8.2 | 8.8 | 8 | 7.6 | 7.9 |
| Tensile Strength (MPa) | 13 | 13.5 | 12.5 | 12.1 | 11.2 | 12 |
| Shear strength (MPa) | 5.8 | 5.6 | 5.5 | 5.4 | 5.2 | 5.3 |
| Water absorption (%) | 1.8 | 2 | 1.9 | 2.1 | 2.1 | 1.95 |
| Production cycle (d) | 25 | 25 | 25 | 25 | 25 | 45 |
| Formulation viscosity (Pa, s) | 13000 | 14500 | 15000 | 13500 | 30000 | 14000 |
| Pore size uniformity | Excellent (excellent) | Excellent (excellent) | Excellent (excellent) | Excellent (excellent) | Good grade (good) | Excellent (excellent) |
| Whether or not there is a large hole | Without any means for | Without any means for | Without any means for | Without any means for | Has the following components | Without any means for |
In summary, the high-density rigid crosslinked polyvinyl chloride foam and the preparation method thereofThe method improves the curing process by increasing the temperature and adopting a spraying mode, shortens the production period to 25-30d, improves the production efficiency and reduces the production cost; adjusting the formula components and proportion, optimizing the stirring and mixing process, reducing the viscosity of the system, enabling the formula components to be uniformly dispersed and nucleated, and preparing 300Kg/m 3 The layering density of the high-density hard crosslinked polyvinyl chloride foam is greatly improved, the problem of holes is effectively improved, and the performance is also effectively improved.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (10)
1. The high-density hard crosslinked polyvinyl chloride foam is characterized by comprising the following raw materials in parts by weight:
500-650 parts of polyvinyl chloride, 10-50 parts of foaming agent, 255-450 parts of isocyanate, 5-50 parts of curing agent, 1-10 parts of surfactant and 1-30 parts of heat stabilizer.
2. The high density rigid crosslinked polyvinyl chloride foam according to claim 1,
the polyvinyl chloride is polyvinyl chloride paste resin, and the viscosity of the type B is 3000-4000cps.
3. The high density rigid crosslinked polyvinyl chloride foam according to claim 1,
the isocyanate comprises the following components in percentage by weight: 1 to 1:2 and a second substance; wherein the method comprises the steps of
The first substance is modified diphenylmethane diisocyanate or toluene diisocyanate;
the second substance is isocyanate methylene polyphenylene ester.
4. A high density rigid crosslinked polyvinyl chloride foam as claimed in claim 3, wherein,
the modified diphenylmethane diisocyanate comprises the following components in parts by weight:
50-70 parts of diphenylmethane-4, 4' -diisocyanate;
25-70 parts of carbodiimide modified MDI;
1 to 2.5 parts of diphenylmethane-2, 4' -diisocyanate.
5. The high density rigid crosslinked polyvinyl chloride foam according to claim 1,
the curing agent is a mixture of methyl hexahydrophthalic anhydride and hexahydrophthalic anhydride, and the weight ratio of the methyl hexahydrophthalic anhydride to the hexahydrophthalic anhydride is 1:1 to 1:3, a step of; or alternatively
The curing agent is epoxy resin.
6. The high density rigid crosslinked polyvinyl chloride foam according to claim 1,
the foaming agent is a mixture of modified azodicarbonamide and azodiisobutyronitrile, and the weight ratio of the modified azodicarbonamide to the azodiisobutyronitrile is 1:1 to 1:3, a step of; wherein the method comprises the steps of
The modified azodicarbonamide is azodicarbonamide containing 0.1-0.2% of sodium bicarbonate by weight, and the particle size range of the mixture is 8-20 microns.
7. The high density rigid crosslinked polyvinyl chloride foam according to claim 1,
the surfactant is an organosilicon polyether copolymer;
the heat stabilizer is one of epoxidized soybean oil, zinc stearate and calcium stearate.
8. The high-density rigid cross-linked polyvinyl chloride foam according to claim 1, wherein the raw materials comprise, by weight:
550-620 parts of polyvinyl chloride, 20-40 parts of foaming agent, 300-400 parts of isocyanate, 10-40 parts of curing agent, 1-5 parts of surfactant and 1-20 parts of heat stabilizer.
9. The high-density rigid cross-linked polyvinyl chloride foam according to claim 1, wherein the raw materials comprise, by weight:
570-600 parts of polyvinyl chloride, 25-35 parts of foaming agent, 350-370 parts of isocyanate, 10-30 parts of curing agent, 1-2 parts of surfactant and 1-10 parts of heat stabilizer.
10. A method for preparing a high-density rigid cross-linked polyvinyl chloride foam, comprising the steps of:
1) Introducing liquid raw materials of isocyanate, surfactant, heat stabilizer and curing agent into a planetary stirring kettle by using a metering pump, and mixing for 30min at 20-30 ℃;
2) Adding the solid powder foaming agent into a stirring kettle, and mixing for 10min at 20-30 ℃;
3) Adding one third of polyvinyl chloride paste resin into a stirring kettle, and mixing for 2min at 20-30 ℃;
4) Adding one third of polyvinyl chloride paste resin into a stirring kettle, and mixing for 2min at 20-30 ℃;
5) Adding one third of polyvinyl chloride paste resin into a stirring kettle, and mixing for 2min at 20-30 ℃;
6) Cleaning the materials which are not fully stirred in the kettle wall, and continuously stirring for 3min at 20-30 ℃;
7) Vacuumizing the stirring kettle to 0.8-1MPa, stirring for 10-20min at the same time, and placing the materials into a die through a bottom discharge valve after no obvious bubbles exist;
8) Placing the die on a flat plate hot plate, pressurizing to 220KG, heating to 171 ℃, and preserving heat for 30min;
cooling to 145 ℃ and keeping for 5 minutes, rapidly reducing the pressure from 220KG to 40KG in no more than 20 seconds, and keeping the pressure until the die is removed; cooling to 35 ℃;
9) Cooling the flat plate hot plate to 25 ℃, releasing pressure, and opening the die to take out the blank;
10 Placing the embryo body into a curing room at 80 ℃, and curing for 25 days by adopting a spray heating mode to obtain the high-density rigid cross-linked polyvinyl chloride foam.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118006060A (en) * | 2024-03-27 | 2024-05-10 | 维赛(江苏)复合材料科技有限公司 | Interpenetrating network type PVC rigid foam with ultrahigh crosslinking degree and preparation method thereof |
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