CN102516656A - Improved polypropylene and method for improving yield strength and toughness of polypropylene - Google Patents
Improved polypropylene and method for improving yield strength and toughness of polypropylene Download PDFInfo
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- CN102516656A CN102516656A CN201110403616XA CN201110403616A CN102516656A CN 102516656 A CN102516656 A CN 102516656A CN 201110403616X A CN201110403616X A CN 201110403616XA CN 201110403616 A CN201110403616 A CN 201110403616A CN 102516656 A CN102516656 A CN 102516656A
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Abstract
The invention discloses an improved polypropylene and a method for improving yield strength and toughness of polypropylene. The improved polypropylene is characterized in that isotactic polypropylene and N,N'-dicyclohexyl-2,6-naphthalene dicarboxamide (DCNDCA) which is utilized as a single nucleating agent of isotactic polypropylene and has a molecular structural formula shown in the formula 1 are mixed uniformly, then are subjected to melt blending and are subjected to isothermal crystallization at a temperature of 135 to 140 DEG C, wherein an addition amount of the nucleating agent of DCNDCA is greater than 0 and is less than or equal to 1% of the mass of the isotactic polypropylene. Through adjustment of a nucleating agent content and isothermal crystallization at different temperatures, the optimum condition capable of improving yield strength and toughness of polypropylene is acquired. The method provided by the invention improves yield strength and toughness of polypropylene thereby promoting polypropylene material development and industrial application.
Description
Technical field
The present invention relates to a kind of polypropylene material, more particularly, relate to a kind of improvement polypropylene material and improve Vestolen PP 7052 surrender flexible method.
Background technology
Isotatic polypropylene (iPP) be a kind of industry and commerce in all widely used hypocrystalline polymer.Because high molecular final form and material property have received the influence of working method to a great extent, therefore iPP can form multiple crystal habit under different condition, can form the β type crystalline phase of monoclinic α type crystalline phase and hexagonal system like it.β-PP receives widely because having unique thermal property and mechanical property and paying close attention to, and the PP toughness of material that beta crystal content is high will be apparently higher than the high PP material of the brilliant content of α.Usually brilliant in order in polypropylene material or goods, to obtain enough high-load β; Or for the crystallization control size to obtain needed material property; Often in polypropylene material, sneak into suitable nucleator in advance, induce the crystallization of isotatic polypropylene, influence its mechanical property.At present, the brilliant nucleator of β can be divided into four big types of the mixtures, aromatic amine, rare earth compound etc. of some salt and the di-carboxylic acid of fused ring compound with directrix plane structure, II A family metallic element.In addition, the suitable nucleator of polypropylene material also can be divided into mineral-type and organic class from chemical structure.Mineral-type nucleator such as mineral filler and various nano-mineral powders such as talcum powder, silicon-dioxide; This type nucleator is generally cheap and easy to get; But the dispersion in Vestolen PP 7052 is difficulty relatively; Light there is shielding effect, can influences the transparency of goods when addition is too much to a great extent, limited its application in requiring anti-reflection modified product.Organic type of nucleator comprises carboxylic metallic salt, phosphate metal salt, glucitol derivative, rosin lipid and high score subclass etc., and the dispersiveness of this type nucleator in Vestolen PP 7052 is better relatively.
Up to now; People can't understand the factor of impact polypropylene material mechanical performance fully; But the crystal transition under the stress between β and the α is undoubted to the material impact of material mechanical performance; And differing temps isothermal crystal inductive crystalline phase changes the mechanical property (for example breaking tenacity, tensile toughness, elongation at break etc.) that also can influence PP; Therefore the raising of material mechanical performance can be owing to crystalline structure and growth and degree of perfection, and the mechanical property that this external differing temps stretched records material is also different.
Summary of the invention
The objective of the invention is to overcome the deficiency of prior art, a kind of raising Vestolen PP 7052 surrender flexible method is provided.Utilize the method for adjustment nucleation agent content and differing temps isothermal crystal to seek a kind of raising Vestolen PP 7052 surrender flexible top condition, method provided by the present invention has improved polyacrylic surrender toughness, thereby promotes the development and the industrial application of polypropylene material.
The object of the invention is realized through following technical proposals:
A kind of improvement Vestolen PP 7052 and raising Vestolen PP 7052 surrender flexible method thereof; Adopt N, N '-dicyclohexyl-2,6-aphthalimide (DCNDCA) is as the single nucleator of isotatic polypropylene; Its molecular structure is as shown in Figure 1; With itself and isotatic polypropylene just be mixed even after melt blending again, in 135 ℃～140 ℃ isothermal crystals, the addition of said DCNDCA nucleator is greater than zero and be not more than 1% of isotatic polypropylene quality.
In method and technology scheme of the present invention; To containing the polypropylene material of certain mass percentage ratio DCNDCA nucleator; Its surrender toughness has dependency to Tc, therefore, and can be through crystallization under different Tcs with the polyacrylic mechanical property of selective regulation.Particularly, the surrender toughness at the sample of 135 ℃ of isothermal crystals is the strongest.
In method and technology scheme of the present invention, the surrender toughness that contains the polypropylene material of DCNDCA nucleator has dependency to the mass percent of DCNDCA nucleator.For ease of carrying out the regulation and control of Vestolen PP 7052 surrender flexible; The consumption of DCNDCA nucleator in Vestolen PP 7052 can be controlled in according to Vestolen PP 7052 mass percent meter in 0～1% the scope; The ys result of sample is as shown in Figure 2 during 135 ℃ of Tcs; When the nucleator content in the sample was less than 0.2%, ys reduced along with increasing of nucleator content, was higher than 0.2% o'clock ys and raise along with increasing of nucleator content.The ys result of sample is as shown in Figure 3 during 140 ℃ of isothermal crystals, and ys reduces along with increasing of nucleator content in the nucleator content range of measuring, but after nucleator content was higher than 0.2%, the changing down of ys reduced.Fig. 2 and Fig. 3 result show: 0.2% nucleator content is the critical content of iPP/DCNDCA mixture, and after greater than this content, the variation of surrender flexible then dissimilates.Therefore can realize that the surrender flexible improves through the mass percent of adjustment DCNDCA nucleator in Vestolen PP 7052, preferred DCNDCA nucleator mass percent is 0.05%-1%.
In the present invention with ys as evaluation material yield flexible index, the surrender toughness of the more little illustrative material of ys is good more.The ys scope of preparation sample is 19.3MPa-23.9MPa.
In method and technology scheme of the present invention; Only with the single nucleator of DCNDCA nucleator as isotatic polypropylene; Not need with the composite use of other nucleator; Can adopt the mode of melt blending to make its homodisperse in polypropylene material, the temperature of melt blending can be selected temperature condition commonly used on the industrial production, as 170 ℃～270 ℃.When both carry out melt blending, be suitable for banburying, open multiple compounding process such as refining, double-screw extruding pelletizing.The adjustment of the consumption of DCNDCA nucleator in polypropylene material and the adjustment of Tc are combined; Can realize the regulation and control of Vestolen PP 7052 surrender flexible easily at 135 ℃ and 140 ℃; Seek to improve Vestolen PP 7052 surrender flexible top condition, be applicable to multiple forming method moulded products such as extrusion moulding, injection molding, calendering formation.
Description of drawings
Fig. 1 is N, N '-dicyclohexyl-2, the molecular chemistry formula of 6-aphthalimide.
Fig. 2 is at the ys of the β-PP of the 135 ℃ of isothermal crystals variation diagram with DCNDCA nucleator content.
Fig. 3 is at the ys of the β-PP of the 140 ℃ of isothermal crystals variation diagram with DCNDCA nucleator content.
The dumb bell sample size of Fig. 4 tensile stress-strain test usefulness.
Embodiment
Further specify technical scheme of the present invention below in conjunction with specific embodiment.Utilize miniature mechanical test machine to carry out tensile property test, be the TST350 of the Linkam company hot platform that stretches, the sample that uses is dumb-bell shape, and like Fig. 4, thickness is 0.5mm, and A is 1 ± 0.1mm, and B is 2mm, and rate of extension is 2mm/min.
Embodiment 1
Take by weighing 100 kilograms of isotatic polypropylene (trade mark T1701; Beijing Yanshan Petrochemical Company of China Petrochemical Industry); Amount according to its mass percent 0.05% takes by weighing DCNDCA nucleator 50g, with the Vestolen PP 7052 that is taken by weighing and DCNDCA nucleator at room temperature through mixed at high speed evenly after, send into the loading hopper of double-screw extruding pelletizing unit; Unit mixing section temperature is set at 210 degrees centigrade; Head temperature is set at 190 degrees centigrade, obtains containing the PP GRANULES material of DCNDCA nucleator mass percent 0.05% through extruding pelletization, with extrusion moulding tubing after this particulate material fusion; The crystallization control temperature is 135 ℃, and under pulled out condition, testing and obtaining ys is 21.4MPa.
Embodiment 2
Take by weighing 100 kilograms of isotatic polypropylene (trade mark T1701; Beijing Yanshan Petrochemical Company of China Petrochemical Industry); Amount according to its mass percent 0.05% takes by weighing DCNDCA nucleator 50g, with the Vestolen PP 7052 that is taken by weighing and DCNDCA nucleator at room temperature through mixed at high speed evenly after, send into the loading hopper of double-screw extruding pelletizing unit; Unit mixing section temperature is set at 210 degrees centigrade; Head temperature is set at 190 degrees centigrade, obtains containing the PP GRANULES material of DCNDCA nucleator mass percent 0.05% through extruding pelletization, with extrusion moulding tubing after this particulate material fusion; The crystallization control temperature is 140 ℃, and under pulled out condition, testing and obtaining ys is 23.9MPa.
Embodiment 3
Take by weighing 100 kilograms of isotatic polypropylene (trade mark T1701; Beijing Yanshan Petrochemical Company of China Petrochemical Industry); Amount according to its mass percent 0.2% takes by weighing DCNDCA nucleator 200g, with the Vestolen PP 7052 that is taken by weighing and DCNDCA nucleator at room temperature through mixed at high speed evenly after, send into the loading hopper of double-screw extruding pelletizing unit; Unit mixing section temperature is set at 210 degrees centigrade; Head temperature is set at 190 degrees centigrade, obtains containing the PP GRANULES material of DCNDCA nucleator mass percent 0.2% through extruding pelletization, with injection molding thin slice after this particulate material fusion; The control die temperature is 135 ℃ of room temperatures, and under pulled out condition, testing and obtaining ys is 19.3MPa.
Embodiment 4
Take by weighing 100 kilograms of isotatic polypropylene (trade mark T1701; Beijing Yanshan Petrochemical Company of China Petrochemical Industry); Amount according to its mass percent 0.2% takes by weighing DCNDCA nucleator 200g, with the Vestolen PP 7052 that is taken by weighing and DCNDCA nucleator at room temperature through mixed at high speed evenly after, send into the loading hopper of double-screw extruding pelletizing unit; Unit mixing section temperature is set at 210 degrees centigrade; Head temperature is set at 190 degrees centigrade, obtains containing the PP GRANULES material of DCNDCA nucleator mass percent 0.2% through extruding pelletization, with injection molding thin slice after this particulate material fusion; The control die temperature is 137 ℃ of room temperatures, and under pulled out condition, testing and obtaining ys is 21.5MPa.
Embodiment 5
Take by weighing 100 kilograms of isotatic polypropylene (trade mark T1701; Beijing Yanshan Petrochemical Company of China Petrochemical Industry); Amount according to its mass percent 1% takes by weighing DCNDCA nucleator 1000g, with the Vestolen PP 7052 that is taken by weighing and DCNDCA nucleator at room temperature through mixed at high speed evenly after, send into the loading hopper of double-screw extruding pelletizing unit; Unit mixing section temperature is set at 210 degrees centigrade; Head temperature is set at 190 degrees centigrade, obtains containing the PP GRANULES material of DCNDCA nucleator mass percent 1% through extruding pelletization, with injection molding thin slice after this particulate material fusion; The control die temperature is 135 ℃ of room temperatures, and under pulled out condition, testing and obtaining ys is 22.1MPa.
Embodiment 6
Take by weighing 100 kilograms of isotatic polypropylene (trade mark T1701; Beijing Yanshan Petrochemical Company of China Petrochemical Industry); Amount according to its mass percent 1% takes by weighing DCNDCA nucleator 1000g, with the Vestolen PP 7052 that is taken by weighing and DCNDCA nucleator at room temperature through mixed at high speed evenly after, send into the loading hopper of double-screw extruding pelletizing unit; Unit mixing section temperature is set at 210 degrees centigrade; Head temperature is set at 190 degrees centigrade, obtains containing the PP GRANULES material of DCNDCA nucleator mass percent 1% through extruding pelletization, with injection molding thin slice after this particulate material fusion; The control die temperature is 138 ℃ of room temperatures, and under pulled out condition, testing and obtaining ys is 23.2MPa.
More than the present invention has been done exemplary description; Should be noted that; Under the situation that does not break away from core of the present invention, the replacement that is equal to that any simple distortion, modification or other those skilled in the art can not spend creative work all falls into protection scope of the present invention.
Claims (8)
1. one kind is improved Vestolen PP 7052; It is characterized in that, adopt N, N '-dicyclohexyl-2; The 6-aphthalimide is as the single nucleator of isotatic polypropylene; With itself and isotatic polypropylene just be mixed even after melt blending again, in 135 ℃～140 ℃ isothermal crystals, the addition of said single nucleator is greater than zero and be not more than 1% of isotatic polypropylene quality.
2. a kind of improvement Vestolen PP 7052 according to claim 1 is characterized in that the isothermal crystal temperature is preferably 135 ℃.
3. a kind of improvement Vestolen PP 7052 according to claim 1 is characterized in that the addition of said single nucleator is the 0.05%-1% of isotatic polypropylene quality.
4. one kind is improved Vestolen PP 7052 surrender flexible method; It is characterized in that, adopt N, N '-dicyclohexyl-2; The 6-aphthalimide is as the single nucleator of isotatic polypropylene; With itself and isotatic polypropylene just be mixed even after melt blending again, in 135 ℃～140 ℃ isothermal crystals, the addition of said single nucleator is greater than zero and be not more than 1% of isotatic polypropylene quality.
5. a kind of raising Vestolen PP 7052 surrender flexible method according to claim 4 is characterized in that the isothermal crystal temperature is preferably 135 ℃.
6. a kind of raising Vestolen PP 7052 surrender flexible method according to claim 4 is characterized in that the addition of said single nucleator is the 0.05%-1% of isotatic polypropylene quality.
7. a kind of raising Vestolen PP 7052 surrender flexible method according to claim 4; It is characterized in that; When 135 ℃ of isothermal crystals; When the nucleation agent content was less than 0.2%, ys reduced along with increasing of nucleator content, was higher than 0.2% o'clock ys and raise along with increasing of nucleator content.
8. a kind of raising Vestolen PP 7052 surrender flexible method according to claim 4; It is characterized in that; When 140 ℃ of isothermal crystals; Ys reduces along with increasing of nucleator content in the nucleator content range of measuring, but after nucleator content was higher than 0.2%, the changing down of ys reduced.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108219263A (en) * | 2016-12-13 | 2018-06-29 | 天津大学 | A kind of method for regulating and controlling beta nucleater induction isotactic polypropylene beta crystal by shear temperature |
| CN111560136A (en) * | 2020-04-09 | 2020-08-21 | 天津大学 | Polypropylene-based high-voltage direct-current cable material and modification and crystallization temperature regulation and control method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1966563A (en) * | 2006-11-08 | 2007-05-23 | 华东理工大学 | Beta crystal form polypropylene nucleating agent and polypropylene resin composition containing same |
| CN101585928A (en) * | 2009-06-12 | 2009-11-25 | 武汉理工大学 | A kind of preparation method of polypropylene beta crystal nucleating agent |
| CN102174227A (en) * | 2011-03-17 | 2011-09-07 | 天津大学 | Method for selectively regulating and controlling crystallization of polypropylene |
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2011
- 2011-12-06 CN CN201110403616XA patent/CN102516656A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1966563A (en) * | 2006-11-08 | 2007-05-23 | 华东理工大学 | Beta crystal form polypropylene nucleating agent and polypropylene resin composition containing same |
| CN101585928A (en) * | 2009-06-12 | 2009-11-25 | 武汉理工大学 | A kind of preparation method of polypropylene beta crystal nucleating agent |
| CN102174227A (en) * | 2011-03-17 | 2011-09-07 | 天津大学 | Method for selectively regulating and controlling crystallization of polypropylene |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108219263A (en) * | 2016-12-13 | 2018-06-29 | 天津大学 | A kind of method for regulating and controlling beta nucleater induction isotactic polypropylene beta crystal by shear temperature |
| CN108219263B (en) * | 2016-12-13 | 2021-04-27 | 天津大学 | Method for inducing isotactic polypropylene beta crystal form by regulating beta nucleating agent through shearing temperature |
| CN111560136A (en) * | 2020-04-09 | 2020-08-21 | 天津大学 | Polypropylene-based high-voltage direct-current cable material and modification and crystallization temperature regulation and control method |
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Application publication date: 20120627 |