CN111393753A - High-strength heat-resistant plastic - Google Patents
High-strength heat-resistant plastic Download PDFInfo
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- CN111393753A CN111393753A CN202010471670.7A CN202010471670A CN111393753A CN 111393753 A CN111393753 A CN 111393753A CN 202010471670 A CN202010471670 A CN 202010471670A CN 111393753 A CN111393753 A CN 111393753A
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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Abstract
The invention discloses a high-strength heat-resistant plastic which is prepared from the following raw materials in parts by weight: 100-120 parts of polypropylene, 20-30 parts of modified short glass fiber, 5-8 parts of talcum powder, 5-8 parts of kaolin, 1-3 parts of coupling agent, 1-3 parts of crosslinking agent and 5-8 parts of calcium stearate; the modified short glass fiber is prepared in the preparation process, dopamine is deposited on the surface of the short glass fiber and is subjected to spontaneous oxidation polymerization on the surface of the short glass fiber to generate a polydopamine layer which is coated on the surface of the glass fiber, the polydopamine still contains phenol and an indole-noise-like functional group and has high reactivity and hydrophilicity, so that the polydopamine adsorbs carbon fiber powder, the carbon fiber powder is coated on the surface of the short glass fiber and is impregnated with a curing solution, and the epoxy resin powder is cured on the surface of the short glass fiber through diethylenetriamine, so that the prepared plastic has good bending strength, tensile strength and heat resistance.
Description
Technical Field
The invention belongs to the technical field of plastic preparation, and particularly relates to a high-strength heat-resistant plastic.
Background
Polypropylene is called PP for short, is colorless, odorless, nontoxic and semitransparent solid matter, is thermoplastic synthetic resin with excellent performance, is colorless and semitransparent thermoplastic light general plastic, has chemical resistance, heat resistance, electric insulation, high-strength mechanical property, good high-wear-resistance processing performance and the like, and can be rapidly and widely developed and applied in various fields of machinery, automobiles, electronic appliances, buildings, textiles, packaging, agriculture, forestry, fisheries, food industry and the like since the coming out of the world, in recent years, along with the rapid development of the industries of packaging, electronics, automobiles and the like in China, the development of the industries in China is greatly promoted, and because of the plasticity, the polypropylene material gradually replaces wooden products, the mechanical function of metal is gradually replaced by the high-strength toughness and the high-wear-resistance performance, and in addition, the polypropylene has good grafting and compounding functions, has huge application space in the concrete, textile, packaging and agriculture, forestry and fishery industries.
The existing polypropylene plastic has low strength, is impacted in the using process, can cause the material to be damaged, has low heat resistance, is used under the condition of high temperature, can cause the polypropylene plastic to have a softening phenomenon, and further causes the material to work normally.
Disclosure of Invention
The invention aims to provide a high-strength heat-resistant plastic.
The technical problems to be solved by the invention are as follows:
the existing polypropylene plastic has low strength, is impacted in the using process, can cause the material to be damaged, has low heat resistance, is used under the condition of high temperature, can cause the polypropylene plastic to have a softening phenomenon, and further causes the material to work normally.
The technical problems to be solved by the invention are as follows:
the purpose of the invention can be realized by the following technical scheme:
a high-strength heat-resistant plastic is prepared from the following raw materials in parts by weight: 100-120 parts of polypropylene, 20-30 parts of modified short glass fiber, 5-8 parts of talcum powder, 5-8 parts of kaolin, 1-3 parts of coupling agent, 1-3 parts of crosslinking agent and 5-8 parts of calcium stearate;
the plastic is prepared by the following steps:
step S1: adding talcum powder and kaolin powder into a pulverizer, pulverizing, sieving with a 1250-mesh and 1500-mesh sieve, and mixing to obtain a first mixture;
step S2: adding polypropylene into a reaction kettle, heating and stirring at the conditions of the rotating speed of 200-170 ℃ and the temperature of 160-170 ℃, adding a coupling agent and a crosslinking agent after the polypropylene is completely molten, stirring for 20-30min at the rotating speed of 500-800r/min and the temperature of 160-170 ℃, adding the first mixture prepared in the step S1, the modified short glass fiber and calcium stearate, and stirring for 20-30min to prepare a second mixture;
and S3, adding the second mixture prepared in the S2 into a screw extruder, and extruding at the temperature of 180-200 ℃ to prepare the high-strength heat-resistant plastic.
Further, the coupling agent is one or a mixture of more of aminopropyltriethoxysilane, vinyltriethoxysilane and ethylenediamine propyltriethoxysilane in any proportion.
Further, the cross-linking agent is one or two of bismaleimide and dicumyl peroxide which are mixed in any proportion.
Further, the modified short glass fiber is prepared by the following steps:
step A1: putting the short glass fiber into a muffle furnace, heating for 1-1.5h at the temperature of 600-700 ℃, cleaning for 1-2 times by using deionized water, putting the short glass fiber into the muffle furnace again, heating for 30-40min at the temperature of 400-500 ℃, and cleaning for 1-2 times by using deionized water to obtain a short glass fiber matrix;
step A2: adding carbon fiber powder and a concentrated nitric acid solution into a stirring kettle, stirring for 8-10h at the rotation speed of 800-;
step A3: adding dopamine and deionized water into a stirring kettle, stirring at the rotation speed of 1000-1500r/min until the dopamine is completely dissolved, adding the first impregnation liquid prepared in the step A2, continuously stirring for 30-40min, adding tris (hydroxymethyl) aminomethane, and adjusting the pH value of the mixed liquid to 8-9 to prepare a second impregnation liquid;
step A4: adding epoxy resin powder, benzyl alcohol and diethylenetriamine into a stirring kettle, and stirring for 20-30min under the condition that the rotating speed is 2000-3000r/min to prepare a curing liquid;
step A5: and (3) adding the short glass fiber matrix prepared in the step A1 and the second impregnation liquid prepared in the step A3 into a reaction kettle, stirring for 20-25h under the condition that the rotation speed is 300-plus 500r/min, taking out the short glass fiber matrix, soaking the short glass fiber matrix into the curing liquid prepared in the step A4 for 1-2h, and heating at the temperature of 130-plus 150 ℃ to prepare the modified short glass fiber.
Further, the mass fraction of the concentrated nitric acid solution in the step A2 is 70-75%, and the using amount ratio of the filter, the deionized water, the diethylenetriamine and the polyvinylpyrrolidone is 1 g: 100m L: 5 g: 5 g.
Further, the dosage ratio of the dopamine and the deionized water in the step A3 is 5 g: 1L.
Furthermore, the using ratio of the epoxy resin powder, the benzyl alcohol and the diethylenetriamine in the step A4 is 5 g: 3m L: 1m L.
The invention has the beneficial effects that: the invention prepares a modified short glass fiber in the preparation process, the short glass fiber is soaked in a second soaking solution, the second soaking solution contains dopamine, the dopamine can deposit on the surface of the short glass fiber under the aerobic alkaline condition, the dopamine is subjected to spontaneous oxidation polymerization on the surface of the short glass fiber to generate a polydopamine layer to be coated on the surface of the glass fiber, the polydopamine still contains phenol and a functional group similar to the indole noise and has high reaction activity and hydrophilicity, so that the surface of the short glass fiber has high reaction activity and hydrophilicity, the polydopamine adsorbs carbon fiber powder to ensure that the carbon fiber powder is coated on the surface of the short glass fiber, the short glass fiber soaked by the second soaking solution is soaked in a curing solution, epoxy resin powder is cured on the surface of the short glass fiber through diethylenetriamine, and the bending strength and the tensile strength of the short glass fiber are further improved, and the glass fiber and the epoxy resin have good heat resistance, and the prepared plastic has good bending strength, tensile strength and heat resistance after being blended with polypropylene.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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
A high-strength heat-resistant plastic is prepared from the following raw materials in parts by weight: 100 parts of polypropylene, 20 parts of modified short glass fiber, 5 parts of talcum powder, 5 parts of kaolin, 1 part of aminopropyl triethoxysilane, 1 part of bismaleimide and 5 parts of calcium stearate;
the plastic is prepared by the following steps:
step S1: adding talcum powder and kaolin powder into a grinder, grinding, sieving by a 1250-mesh sieve, and mixing to obtain a first mixture;
step S2: adding polypropylene into a reaction kettle, heating and stirring at the rotation speed of 200r/min and the temperature of 160 ℃, adding aminopropyltriethoxysilane and bismaleimide after the polypropylene is completely melted, stirring for 20min at the rotation speed of 500r/min and the temperature of 160 ℃, adding the first mixture prepared in the step S1, the modified short glass fiber and calcium stearate, and stirring for 20min to prepare a second mixture;
and S3, adding the second mixture prepared in the step S2 into a screw extruder, and extruding at the temperature of 180 ℃ to prepare the high-strength heat-resistant plastic.
The modified short glass fiber is prepared by the following steps:
step A1: putting the short glass fiber into a muffle furnace, heating for 1h at the temperature of 600 ℃, then washing for 1 time by using deionized water, putting the short glass fiber into the muffle furnace again, heating for 30min at the temperature of 400 ℃, then washing for 1-2 times by using deionized water, and thus obtaining a short glass fiber matrix;
step A2: adding carbon fiber powder and a concentrated nitric acid solution into a stirring kettle, stirring for 8 hours at the rotation speed of 500r/min and the temperature of 80 ℃, filtering to remove filtrate to obtain a filtrate, adding the filtrate, deionized water, diethylenetriamine and polyvinylpyrrolidone into the stirring kettle, and stirring for 6 hours at the rotation speed of 1000r/min and the temperature of 80 ℃ to obtain a first impregnation liquid;
step A3: adding dopamine and deionized water into a stirring kettle, stirring at the rotation speed of 1000r/min until the dopamine is completely dissolved, adding the first impregnation liquid prepared in the step A2, continuously stirring for 30min, adding tris (hydroxymethyl) aminomethane, and adjusting the pH value of the mixed liquid to 8 to prepare a second impregnation liquid;
step A4: adding epoxy resin powder, benzyl alcohol and diethylenetriamine into a stirring kettle, and stirring for 20min under the condition that the rotating speed is 2000r/min to prepare a curing liquid;
step A5: and B, adding the short glass fiber matrix prepared in the step A1 and the second impregnation liquid prepared in the step A3 into a reaction kettle, stirring for 20 hours at the rotation speed of 300r/min, taking out the short glass fiber matrix, soaking the short glass fiber matrix into the curing liquid prepared in the step A4 for 1 hour, and heating at the temperature of 130 ℃ to prepare the modified short glass fiber.
Example 2
A high-strength heat-resistant plastic is prepared from the following raw materials in parts by weight: 110 parts of polypropylene, 25 parts of modified short glass fiber, 6 parts of talcum powder, 6 parts of kaolin, 2 parts of aminopropyl triethoxysilane, 2 parts of bismaleimide and 6 parts of calcium stearate;
the plastic is prepared by the following steps:
step S1: adding talcum powder and kaolin powder into a grinder, grinding, sieving by a 1350-mesh sieve, and mixing to obtain a first mixture;
step S2: adding polypropylene into a reaction kettle, heating and stirring at the rotation speed of 250r/min and the temperature of 165 ℃, adding aminopropyltriethoxysilane and bismaleimide after the polypropylene is completely melted, stirring for 25min at the rotation speed of 600r/min and the temperature of 165 ℃, adding the first mixture prepared in the step S1, the modified short glass fiber and calcium stearate, and stirring for 25min to prepare a second mixture;
and S3, adding the second mixture prepared in the step S2 into a screw extruder, and extruding at 190 ℃ to prepare the high-strength heat-resistant plastic.
The modified short glass fiber is prepared by the following steps:
step A1: putting the short glass fiber into a muffle furnace, heating for 1.3h at the temperature of 650 ℃, cleaning for 1 time by using deionized water, putting the short glass fiber into the muffle furnace again, heating for 35min at the temperature of 450 ℃, cleaning for 1 time by using deionized water, and obtaining a short glass fiber matrix;
step A2: adding carbon fiber powder and a concentrated nitric acid solution into a stirring kettle, stirring for 9 hours at the rotation speed of 600r/min and the temperature of 90 ℃, filtering to remove filtrate to obtain a filtrate, adding the filtrate, deionized water, diethylenetriamine and polyvinylpyrrolidone into the stirring kettle, and stirring for 7 hours at the rotation speed of 1300r/min and the temperature of 90 ℃ to obtain a first impregnation liquid;
step A3: adding dopamine and deionized water into a stirring kettle, stirring at the rotating speed of 1300r/min until the dopamine is completely dissolved, adding the first impregnation liquid prepared in the step A2, continuously stirring for 35min, adding tris (hydroxymethyl) aminomethane, and adjusting the pH value of the mixed liquid to 8 to prepare a second impregnation liquid;
step A4: adding epoxy resin powder, benzyl alcohol and diethylenetriamine into a stirring kettle, and stirring for 25min under the condition that the rotating speed is 2500r/min to prepare a curing liquid;
step A5: and B, adding the short glass fiber matrix prepared in the step A1 and the second impregnation liquid prepared in the step A3 into a reaction kettle, stirring for 23 hours at the rotation speed of 400r/min, taking out the short glass fiber matrix, soaking the short glass fiber matrix into the curing liquid prepared in the step A4 for 1.5 hours, and heating at the temperature of 140 ℃ to prepare the modified short glass fiber.
Example 3
A high-strength heat-resistant plastic is prepared from the following raw materials in parts by weight: 120 parts of polypropylene, 30 parts of modified short glass fiber, 8 parts of talcum powder, 8 parts of kaolin, 3 parts of aminopropyl triethoxysilane, 3 parts of bismaleimide and 8 parts of calcium stearate;
the plastic is prepared by the following steps:
step S1: adding talcum powder and kaolin powder into a grinder, grinding, sieving by a 1500-mesh sieve, and mixing to obtain a first mixture;
step S2: adding polypropylene into a reaction kettle, heating and stirring at the rotating speed of 300r/min and the temperature of 170 ℃, adding aminopropyltriethoxysilane and bismaleimide after the polypropylene is completely melted, stirring for 30min at the rotating speed of 800r/min and the temperature of 170 ℃, adding the first mixture prepared in the step S1, the modified short glass fiber and calcium stearate, and stirring for 30min to prepare a second mixture;
and S3, adding the second mixture prepared in the step S2 into a screw extruder, and extruding at the temperature of 200 ℃ to prepare the high-strength heat-resistant plastic.
The modified short glass fiber is prepared by the following steps:
step A1: putting the short glass fiber into a muffle furnace, heating for 1.5h at the temperature of 700 ℃, cleaning for 2 times by using deionized water, putting the short glass fiber into the muffle furnace again, heating for 40min at the temperature of 500 ℃, and cleaning for 2 times by using deionized water to obtain a short glass fiber matrix;
step A2: adding carbon fiber powder and a concentrated nitric acid solution into a stirring kettle, stirring for 10 hours at the rotating speed of 800r/min and the temperature of 100 ℃, filtering to remove filtrate to obtain a filtrate, adding the filtrate, deionized water, diethylenetriamine and polyvinylpyrrolidone into the stirring kettle, and stirring for 8 hours at the rotating speed of 1500r/min and the temperature of 100 ℃ to obtain a first impregnation liquid;
step A3: adding dopamine and deionized water into a stirring kettle, stirring at the rotation speed of 1500r/min until the dopamine is completely dissolved, adding the first impregnation liquid prepared in the step A2, continuously stirring for 40min, adding tris (hydroxymethyl) aminomethane, and adjusting the pH value of the mixed liquid to 9 to prepare a second impregnation liquid;
step A4: adding epoxy resin powder, benzyl alcohol and diethylenetriamine into a stirring kettle, and stirring for 30min under the condition that the rotating speed is 3000r/min to prepare a curing liquid;
step A5: and B, adding the short glass fiber matrix prepared in the step A1 and the second impregnation liquid prepared in the step A3 into a reaction kettle, stirring for 25 hours at the rotation speed of 500r/min, taking out the short glass fiber matrix, soaking the short glass fiber matrix into the curing liquid prepared in the step A4 for 2 hours, and heating at the temperature of 150 ℃ to prepare the modified short glass fiber.
Comparative example 1
The comparative example is a polypropylene plastic commonly found on the market.
The plastics prepared in the above examples 1 to 3 and comparative example 1 were subjected to a performance test, and the test results are shown in the following table 1;
TABLE 1
| Flexural strength/MPa | Tensile strength/MPa | Heat distortion temperature/. degree.C | |
| Example 1 | 135 | 115 | 152 |
| Example 2 | 130 | 110 | 148 |
| Example 3 | 135 | 110 | 153 |
| Comparative example 1 | 50 | 30 | 110 |
From the above table 1, it can be seen that the bending strength of the plastic prepared in examples 1-3 is 130-135Mpa and the tensile strength is 110-115Mpa, while the bending strength of the polypropylene prepared in comparative example 1 is 50Mpa and the tensile strength is 110Mpa, and the strength of the plastic prepared in comparative examples 1-3 is much higher than that of comparative example 1, and the heat distortion temperature of the plastic prepared in examples 1-3 is 148-153 ℃, and the liquid is higher than that of comparative example 1, indicating that the plastic prepared in the present invention has good strength and heat resistance.
The foregoing is merely exemplary and illustrative of the principles of the present invention and various modifications, additions and substitutions of the specific embodiments described herein may be made by those skilled in the art without departing from the principles of the present invention or exceeding the scope of the claims set forth herein.
Claims (7)
1. A high-strength heat-resistant plastic is characterized in that: the feed is prepared from the following raw materials in parts by weight: 100-120 parts of polypropylene, 20-30 parts of modified short glass fiber, 5-8 parts of talcum powder, 5-8 parts of kaolin, 1-3 parts of coupling agent, 1-3 parts of crosslinking agent and 5-8 parts of calcium stearate;
the plastic is prepared by the following steps:
step S1: adding talcum powder and kaolin powder into a pulverizer, pulverizing, sieving with a 1250-mesh and 1500-mesh sieve, and mixing to obtain a first mixture;
step S2: adding polypropylene into a reaction kettle, heating and stirring at the conditions of the rotating speed of 200-170 ℃ and the temperature of 160-170 ℃, adding a coupling agent and a crosslinking agent after the polypropylene is completely molten, stirring for 20-30min at the rotating speed of 500-800r/min and the temperature of 160-170 ℃, adding the first mixture prepared in the step S1, the modified short glass fiber and calcium stearate, and stirring for 20-30min to prepare a second mixture;
and S3, adding the second mixture prepared in the S2 into a screw extruder, and extruding at the temperature of 180-200 ℃ to prepare the high-strength heat-resistant plastic.
2. A high strength heat resistant plastic according to claim 1, wherein: the coupling agent is one or a mixture of more of aminopropyltriethoxysilane, vinyl triethoxysilane and ethylenediamine propyl triethoxysilane in any proportion.
3. A high strength heat resistant plastic according to claim 1, wherein: the cross-linking agent is one or two of bismaleimide and dicumyl peroxide mixed in any proportion.
4. A high strength heat resistant plastic according to claim 1, wherein: the modified short glass fiber is prepared by the following steps:
step A1: putting the short glass fiber into a muffle furnace, heating for 1-1.5h at the temperature of 600-700 ℃, cleaning for 1-2 times by using deionized water, putting the short glass fiber into the muffle furnace again, heating for 30-40min at the temperature of 400-500 ℃, and cleaning for 1-2 times by using deionized water to obtain a short glass fiber matrix;
step A2: adding carbon fiber powder and a concentrated nitric acid solution into a stirring kettle, stirring for 8-10h at the rotation speed of 800-;
step A3: adding dopamine and deionized water into a stirring kettle, stirring at the rotation speed of 1000-1500r/min until the dopamine is completely dissolved, adding the first impregnation liquid prepared in the step A2, continuously stirring for 30-40min, adding tris (hydroxymethyl) aminomethane, and adjusting the pH value of the mixed liquid to 8-9 to prepare a second impregnation liquid;
step A4: adding epoxy resin powder, benzyl alcohol and diethylenetriamine into a stirring kettle, and stirring for 20-30min under the condition that the rotating speed is 2000-3000r/min to prepare a curing liquid;
step A5: and (3) adding the short glass fiber matrix prepared in the step A1 and the second impregnation liquid prepared in the step A3 into a reaction kettle, stirring for 20-25h under the condition that the rotation speed is 300-plus 500r/min, taking out the short glass fiber matrix, soaking the short glass fiber matrix into the curing liquid prepared in the step A4 for 1-2h, and heating at the temperature of 130-plus 150 ℃ to prepare the modified short glass fiber.
5. The high-strength heat-resistant plastic according to claim 4, wherein the mass fraction of the concentrated nitric acid solution in the step A2 is 70-75%, and the usage ratio of the filter, the deionized water, the diethylenetriamine and the polyvinylpyrrolidone is 1 g: 100m L: 5 g: 5 g.
6. The high-strength heat-resistant plastic according to claim 4, wherein the amount ratio of the dopamine to the deionized water in the step A3 is 5 g: 1L.
7. The high-strength heat-resistant plastic according to claim 4, wherein the amount ratio of the epoxy resin powder in the step A4, the benzyl alcohol and the diethylenetriamine is 5 g: 3m L: 1m L.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115725135A (en) * | 2022-10-28 | 2023-03-03 | 重庆会通科技有限公司 | Anti-floating fiber polypropylene reinforced composite material and preparation method thereof |
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| EP0211479A2 (en) * | 1985-06-03 | 1987-02-25 | MITSUI TOATSU CHEMICALS, Inc. | Glass fibre-reinforced polypropylene composition |
| JPS63154755A (en) * | 1986-12-17 | 1988-06-28 | Mitsuboshi Belting Ltd | Glass fiber-reinforced polypropylene resin composition |
| CN104788807A (en) * | 2015-03-31 | 2015-07-22 | 苏州市鼎立包装有限公司 | High-strength polypropylene packaging bag and preparation method thereof |
| CN108070150A (en) * | 2016-11-18 | 2018-05-25 | 合肥杰事杰新材料股份有限公司 | A kind of modified fiber glass reinforced polypropylene composition and preparation method thereof |
| CN110938287A (en) * | 2018-09-21 | 2020-03-31 | 广西大学 | Preparation method of multilayer carbon fiber/glass fiber epoxy resin composite material |
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2020
- 2020-05-29 CN CN202010471670.7A patent/CN111393753A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0211479A2 (en) * | 1985-06-03 | 1987-02-25 | MITSUI TOATSU CHEMICALS, Inc. | Glass fibre-reinforced polypropylene composition |
| JPS63154755A (en) * | 1986-12-17 | 1988-06-28 | Mitsuboshi Belting Ltd | Glass fiber-reinforced polypropylene resin composition |
| CN104788807A (en) * | 2015-03-31 | 2015-07-22 | 苏州市鼎立包装有限公司 | High-strength polypropylene packaging bag and preparation method thereof |
| CN108070150A (en) * | 2016-11-18 | 2018-05-25 | 合肥杰事杰新材料股份有限公司 | A kind of modified fiber glass reinforced polypropylene composition and preparation method thereof |
| CN110938287A (en) * | 2018-09-21 | 2020-03-31 | 广西大学 | Preparation method of multilayer carbon fiber/glass fiber epoxy resin composite material |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115725135A (en) * | 2022-10-28 | 2023-03-03 | 重庆会通科技有限公司 | Anti-floating fiber polypropylene reinforced composite material and preparation method thereof |
| CN115725135B (en) * | 2022-10-28 | 2023-11-10 | 重庆会通科技有限公司 | Anti-floating fiber polypropylene reinforced composite material and preparation method thereof |
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