CN115558207B - Preparation method of precipitation-resistant silane auxiliary agent - Google Patents
Preparation method of precipitation-resistant silane auxiliary agent Download PDFInfo
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- CN115558207B CN115558207B CN202111560061.XA CN202111560061A CN115558207B CN 115558207 B CN115558207 B CN 115558207B CN 202111560061 A CN202111560061 A CN 202111560061A CN 115558207 B CN115558207 B CN 115558207B
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- 239000012752 auxiliary agent Substances 0.000 title claims abstract description 43
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 229910000077 silane Inorganic materials 0.000 title claims abstract description 36
- 238000001556 precipitation Methods 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 239000004743 Polypropylene Substances 0.000 claims abstract description 57
- -1 polypropylene Polymers 0.000 claims abstract description 49
- 229920001155 polypropylene Polymers 0.000 claims abstract description 48
- 229920001971 elastomer Polymers 0.000 claims abstract description 20
- 239000005060 rubber Substances 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 15
- XMNIXWIUMCBBBL-UHFFFAOYSA-N 2-(2-phenylpropan-2-ylperoxy)propan-2-ylbenzene Chemical group C=1C=CC=CC=1C(C)(C)OOC(C)(C)C1=CC=CC=C1 XMNIXWIUMCBBBL-UHFFFAOYSA-N 0.000 claims description 16
- BIISIZOQPWZPPS-UHFFFAOYSA-N 2-tert-butylperoxypropan-2-ylbenzene Chemical compound CC(C)(C)OOC(C)(C)C1=CC=CC=C1 BIISIZOQPWZPPS-UHFFFAOYSA-N 0.000 claims description 15
- 239000003999 initiator Substances 0.000 claims description 12
- 229920005604 random copolymer Polymers 0.000 claims description 9
- 230000035484 reaction time Effects 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 5
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 4
- 229920002554 vinyl polymer Polymers 0.000 claims description 4
- 238000007334 copolymerization reaction Methods 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 8
- 238000005452 bending Methods 0.000 abstract description 5
- KRDXTHSSNCTAGY-UHFFFAOYSA-N 2-cyclohexylpyrrolidine Chemical compound C1CCNC1C1CCCCC1 KRDXTHSSNCTAGY-UHFFFAOYSA-N 0.000 abstract description 3
- 239000002861 polymer material Substances 0.000 abstract description 3
- LCKPEFUXKRSTMA-UHFFFAOYSA-N 6-propan-2-yl-7-oxabicyclo[4.1.0]hepta-2,4-diene Chemical compound C1=CC=CC2(C(C)C)C1O2 LCKPEFUXKRSTMA-UHFFFAOYSA-N 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 239000000155 melt Substances 0.000 description 8
- 230000003678 scratch resistant effect Effects 0.000 description 8
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 6
- 239000005977 Ethylene Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 238000007790 scraping Methods 0.000 description 5
- 229920002943 EPDM rubber Polymers 0.000 description 4
- 239000004594 Masterbatch (MB) Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000796 flavoring agent Substances 0.000 description 3
- 235000019634 flavors Nutrition 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Natural products C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
- 239000003209 petroleum derivative Substances 0.000 description 3
- 229920001296 polysiloxane Polymers 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- JOLVYUIAMRUBRK-UTOQUPLUSA-N Cardanol Chemical class OC1=CC=CC(CCCCCCC\C=C/C\C=C/CC=C)=C1 JOLVYUIAMRUBRK-UTOQUPLUSA-N 0.000 description 2
- ZFMSMUAANRJZFM-UHFFFAOYSA-N Estragole Chemical compound COC1=CC=C(CC=C)C=C1 ZFMSMUAANRJZFM-UHFFFAOYSA-N 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 150000002978 peroxides Chemical group 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000004952 Polyamide Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- FPYJFEHAWHCUMM-UHFFFAOYSA-N maleic anhydride Chemical compound O=C1OC(=O)C=C1 FPYJFEHAWHCUMM-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 150000001282 organosilanes Chemical class 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Graft Or Block Polymers (AREA)
Abstract
The application relates to the technical field of C08L high polymer materials, and in particular provides a preparation method of a precipitation-resistant silane auxiliary agent. According to the preparation method of the precipitation-resistant silane auxiliary agent, the random copolymerization polypropylene, the organosilicon crude rubber, the cumene oxide and the tert-butyl cumyl peroxide are used as raw materials, the prepared silane auxiliary agent has a smooth surface and good yield, and has good scratch resistance and precipitation resistance when used in polypropylene, so that the polypropylene has excellent scratch resistance, precipitation resistance, bending property and tensile property; meanwhile, the preparation method is simple and easy to operate, and the method of banburying at normal temperature is adopted, so that the energy consumption is obviously reduced, the environment is friendly, the cost is low, and the industrial-grade large-scale production and sales are facilitated.
Description
Technical Field
The application relates to the technical field of C08L high polymer materials, and in particular provides a preparation method of a precipitation-resistant silane auxiliary agent.
Background
Polypropylene has excellent strength, corrosion resistance and heat resistance, and is widely used in the fields of mechanical parts, corrosion resistance, insulating parts and the like. In order to ensure the normal operation of various precise parts in the working process, higher requirements are put on the wear resistance and scratch resistance of polypropylene. The occurrence of the organosilicon auxiliary agent with the scraping-resistant effect provides a new method for improving the wear resistance and the scraping resistance of the polypropylene, but the organosilicon auxiliary agent and the scraping-resistant agent in the prior art have poor compatibility with the polypropylene, are easy to precipitate in a polypropylene system, lead to the reduction of the mechanical property of the polypropylene, and severely limit the application range of the polypropylene in various parts and composite materials.
The Chinese patent with the patent publication number of CN113024814A discloses a scratch-resistant auxiliary agent of bio-polysiloxane, in the disclosed patent, chemical agents such as low-hydrogen polysiloxane, hydrogenated cardanol and the like are taken as raw materials, the prepared scratch-resistant auxiliary agent has good scratch resistance in a composite material, but the tensile strength and bending strength of the composite material for the scratch-resistant auxiliary agent are not reflected, and meanwhile, the raw materials such as hydrogenated cardanol or estragole and the like are used in the preparation method, so that the scratch-resistant auxiliary agent is not suitable for industrial mass production, sales and popularization.
The application discloses a preparation method of a plastic scratch-resistant master batch, wherein maleic anhydride and polyamide are adopted to modify high molecular weight organosilicon, and modified organosilicon and a flavor absorber are introduced into resins such as PA, PE, PP and the like, so that the problems of poor dispersibility and adhesive force of the plastic scratch-resistant master batch in the prior art are solved, but the flavor of the scratch-resistant master batch needs to be reduced by introducing the flavor absorber in the scheme, and the anti-precipitation performance of the master batch is not remarkably shown.
Therefore, the preparation method of the excellent silane auxiliary agent, which has the advantages of simple and easily obtained preparation raw materials, safe and efficient synthesis process, good scratch resistance, small addition amount, low smell and precipitation resistance, is developed, and has potential application value in the field of high polymer materials, in particular in the field of scratch-resistant high polymer master batches applied to polypropylene.
Disclosure of Invention
The application provides a preparation method of a precipitation-resistant silane auxiliary agent, which comprises the following steps:
(1) Placing the raw materials into an internal mixer for reaction to obtain a grafted product;
(2) And (3) placing the grafted product obtained in the step (2) in a double-screw extruder, and granulating through extrusion to obtain the precipitation-resistant silane auxiliary agent.
As a preferable technical scheme of the application, the raw materials in the step (1) comprise 40-50 parts by weight of organosilicon raw rubber, 50-60 parts by weight of polypropylene and 0.15-0.2 part by weight of initiator.
As a preferable technical scheme of the application, the relative molecular weight of the organosilicon raw rubber is 30-60 ten thousand.
As a more preferable technical scheme of the application, the relative molecular weight of the organosilicon raw rubber is 30-45 ten thousand.
As a preferred technical scheme of the application, the polypropylene is random copolymer polypropylene.
As a more preferable technical scheme of the application, the mass fraction of ethylene of the random copolymer polypropylene is 1.5-2.5%.
As a most preferable technical scheme of the application, the ethylene mass fraction of the random copolymer polypropylene is 2.2%.
As a preferable technical scheme of the application, the initiator is a peroxide initiator.
As a preferable technical scheme of the application, the peroxide initiator is cumene peroxide or tert-butylcumene peroxide, and the mass ratio of the cumene peroxide to the tert-butylcumene peroxide is (0.5-1): (0.2-0.6).
As a more preferable technical scheme of the application, the mass ratio of the cumene peroxide to the tert-butylcumene peroxide is 0.8:0.4.
as a preferable technical scheme of the application, the temperature of the internal mixer in the step (1) is 25-35 ℃.
As a more preferable technical scheme of the application, the temperature of the internal mixer in the step (1) is 30 ℃.
As a preferable technical scheme of the application, the reaction time in the step (1) is 15-30min.
As a more preferable technical scheme of the application, the reaction time in the step (1) is 25min.
The inventor finds that the organosilane auxiliary agent applied to plastics in the prior art is easy to precipitate and sticky, has a large amount of additive to the plastics, causes a large smell of the products, can influence the mechanical properties of the plastics such as tensile strength, bending strength and the like, and limits the application range of the silane auxiliary agent in the polymer composite material. The inventor unexpectedly discovers that when the random copolymerization polypropylene with the relative molecular weight of 30-45 ten thousand and the mass fraction of ethylene of 2.2% is used, the introduction of ethylene monomer with specific content improves the stability of the random copolymerization polypropylene, realizes the full degradation of the random copolymerization polypropylene by cumene peroxide and tert-butylcumene peroxide in the system, promotes the compatibility with the organosilicon crude rubber with the relative molecular weight of 30-45 ten thousand, promotes the copolymerization degree between the random copolymerization polypropylene and the organosilicon crude rubber, enhances the controllability of the molecular weight of the organosilicon auxiliary agent, avoids the phenomenon that the silane auxiliary agent is easy to be precipitated in the polypropylene system, and damages the internal structure of the polypropylene system, influences the mechanical property of the polypropylene and reduces the scratch resistance of the polypropylene if the silane auxiliary agent is easy to be precipitated.
As a preferable technical scheme of the application, the temperature of the twin-screw extruder in the step (2) is 160-250 ℃.
As a more preferable technical scheme of the application, the temperature of the double-screw extruder in the step (2) is 175 ℃.
As a preferable technical scheme of the application, the rotating speed of the screw in the double-screw extruder in the step (2) is 550-850r/min.
As a more preferable technical scheme of the application, the rotating speed of the screw in the double-screw extruder in the step (2) is 750r/min.
As a preferable technical scheme of the application, the rotating speed of a feeding port in the double-screw extruder in the step (2) is 240-380r/min.
As a more preferable technical scheme of the application, the rotating speed of the feeding port in the double-screw extruder in the step (2) is 320r/min.
The inventors have unexpectedly found that when the temperature of the twin-screw extruder is strictly controlled to 175 ℃, the rotating speed of the screw is 750r/min, and the rotating speed of the feeding port is 320r/min, the viscosity uniformity and hardness of the melt can be improved while the grafting rate of the grafted product is not affected, the internal friction of the melt in the extruder is reduced, the phenomena of deformation and bamboo joint in the melting process of the extruder are avoided, the plasticizing uniformity of the melt is enhanced, and the prepared silane auxiliary agent particles are smooth, have no problem of scale or drop, and have excellent yield.
Compared with the prior art, the application has the following beneficial effects:
1. the preparation method of the precipitation-resistant silane auxiliary agent adopts organosilicon raw rubber with the relative molecular weight of 30-45 ten thousand, and adopts random copolymerized polypropylene with the ethylene mass fraction of 2.2 percent, and the mass ratio is 0.8:0.4, under the action of cumene peroxide and tert-butylcumyl peroxide, the migration of random copolymer polypropylene to the surface of organosilicon is improved, and the components have good dispersion uniformity in the system, so that the phenomenon that a silane auxiliary agent is easy to separate out and sticky in the polypropylene system is avoided;
2. according to the preparation method of the precipitation-resistant silane auxiliary agent, when the temperature of an internal mixer is strictly controlled to be 30 ℃ and the reaction time is 25min, the full copolymerization of the organosilicon crude rubber with small molecular weight in a system and the random copolymerization polypropylene can be realized, and the prepared silane auxiliary agent is counted into the polypropylene, so that the precipitation-resistant performance of the polypropylene in the polypropylene can be improved on the basis of increasing the scratch resistance performance of the polypropylene;
3. according to the preparation method of the precipitation-resistant silane auxiliary agent, when the temperature of the double-screw extruder is strictly controlled to 175 ℃, the viscosity uniformity and hardness of a melt can be improved, the plasticizing uniformity of the melt can be enhanced, and the scratch resistance, tensile strength and bending strength of the silane auxiliary agent can be improved while the grafting rate of a grafted product is not influenced;
4. according to the preparation method of the precipitation-resistant silane auxiliary agent, provided by the application, when the rotating speed of the screw is 750r/min and the rotating speed of the feeding port is 320r/min, on the basis of ensuring that the melt has good viscosity and uniformity, the internal friction coefficient of the melt in the extruder is reduced, the phenomena that the melt is easy to deform and bamboo joints occur in the melting process of the extruder are effectively avoided, the yield of the silane auxiliary agent is improved, and the prepared silane auxiliary agent has smooth particle surface and no scale or dropping problem.
5. According to the preparation method of the precipitation-resistant silane auxiliary agent, random copolymerization polypropylene and organosilicon raw rubber are used as main raw materials, under the action of cumene oxide and tert-butyl cumyl peroxide, the silane auxiliary agent is prepared by strictly controlling the banburying temperature and time and the temperature and the rotating speed in an extruder, has excellent grafting rate, has good scraping resistance and precipitation resistance when used in polypropylene, and can achieve the effects of simultaneously taking the scraping resistance, the precipitation resistance, the bending strength and the tensile strength of the polypropylene into consideration; meanwhile, the preparation method adopts a normal-temperature banburying method, so that the energy consumption is obviously reduced, the environment is friendly, the cost is low, and the industrial-grade large-scale production and sales are facilitated.
Detailed Description
Examples
Example 1
Example 1 provides a method for preparing a precipitation-resistant silane auxiliary agent, comprising the following steps:
(1) Placing the raw materials into an internal mixer for reaction to obtain a grafted product;
(2) And (3) placing the grafted product obtained in the step (2) in a double-screw extruder, and granulating through extrusion to obtain the precipitation-resistant silane auxiliary agent.
The raw materials in the step (1) are 45 parts by weight of organosilicon raw rubber, 55 parts by weight of polypropylene and 0.18 part by weight of initiator, wherein the organosilicon raw rubber has a relative molecular weight of 30-45 ten thousand and is purchased from Shanghai culvert point science and technology Co;
the polypropylene is random copolymer polypropylene, and is purchased from Dushan petrochemical company of China Petroleum and natural gas Co., ltd, the model is Y-03, and the vinyl mass fraction is 2.2%;
the initiator is cumene peroxide or tert-butylcumene peroxide, and the mass ratio of the cumene peroxide to the tert-butylcumene peroxide is 0.8:0.4; the CAS number of the cumene peroxide is 80-15-9; the CAS number of the tert-butylcumene peroxide is 30580-75-7;
the temperature of the internal mixer in the step (1) is 25 ℃;
the reaction time in the step (1) is 15min;
the temperature of the double-screw extruder in the step (2) is 160 ℃;
the rotating speed of the screw in the double-screw extruder in the step (2) is 550r/min;
the rotating speed of a feeding port in the double-screw extruder in the step (2) is 240r/min.
Example 2
Example 2 provides a method for preparing a precipitation-resistant silane auxiliary agent, comprising the following steps:
(1) Placing the raw materials into an internal mixer for reaction to obtain a grafted product;
(2) And (3) placing the grafted product obtained in the step (2) in a double-screw extruder, and granulating through extrusion to obtain the precipitation-resistant silane auxiliary agent.
The raw materials in the step (1) are 45 parts by weight of organosilicon raw rubber, 55 parts by weight of polypropylene and 0.18 part by weight of initiator;
the relative molecular weight of the organosilicon raw rubber is 30-45 ten thousand, and the organosilicon raw rubber is purchased from Shanghai culvert point science and technology limited company;
the polypropylene is random copolymer polypropylene, and is purchased from Dushan petrochemical company of China Petroleum and natural gas Co., ltd, the model is Y-03, and the vinyl mass fraction is 2.2%;
the initiator is cumene peroxide or tert-butylcumene peroxide, and the mass ratio of the cumene peroxide to the tert-butylcumene peroxide is 0.8:0.4; the CAS number of the cumene peroxide is 80-15-9; the CAS number of the tert-butylcumene peroxide is 30580-75-7;
the temperature of the internal mixer in the step (1) is 35 ℃;
the reaction time in the step (1) is 30min;
the temperature of the double-screw extruder in the step (2) is 250 ℃;
the rotating speed of the screw in the double-screw extruder in the step (2) is 850r/min;
the rotating speed of a feeding port in the double-screw extruder in the step (2) is 240r/min.
Example 3
Example 3 provides a method for preparing a precipitation-resistant silane auxiliary comprising the steps of:
(1) Placing the raw materials into an internal mixer for reaction to obtain a grafted product;
(2) And (3) placing the grafted product obtained in the step (2) in a double-screw extruder, and granulating through extrusion to obtain the precipitation-resistant silane auxiliary agent.
The raw materials in the step (1) are 45 parts by weight of organosilicon raw rubber, 55 parts by weight of polypropylene and 0.18 part by weight of initiator;
the relative molecular weight of the organosilicon raw rubber is 30-45 ten thousand, and the organosilicon raw rubber is purchased from Shanghai culvert point science and technology limited company;
the polypropylene is random copolymer polypropylene, and is purchased from Dushan petrochemical company of China Petroleum and natural gas Co., ltd, the model is Y-03, and the vinyl mass fraction is 2.2%;
the initiator is cumene peroxide or tert-butylcumene peroxide, and the mass ratio of the cumene peroxide to the tert-butylcumene peroxide is 0.8:0.4; the CAS number of the cumene peroxide is 80-15-9; the CAS number of the tert-butylcumene peroxide is 30580-75-7;
the temperature of the internal mixer in the step (1) is 30 ℃;
the reaction time in the step (1) is 25min;
the temperature of the double-screw extruder in the step (2) is 175 ℃;
the rotating speed of the screw in the double-screw extruder in the step (2) is 750r/min;
the rotating speed of a feeding port in the double-screw extruder in the step (2) is 320r/min.
Comparative example 1
Comparative example 1 a specific embodiment is the same as example 3 except that the silicone raw rubber has a relative molecular weight of 60 to 70 ten thousand.
Comparative example 2
Comparative example 2a specific embodiment is the same as example 3 except that the ethylene mass fraction of the random copolymer polypropylene is 3.2%.
Evaluation of Performance
Adding the silane auxiliary agents obtained in the examples 1-3 and the comparative examples 1-3 into a PP+T20 material, wherein the addition amount of the silane auxiliary agent is 2% of that of the PP+T20 material, obtaining a detection sample 1, and performing relevant detection, wherein the data are shown in Table 1;
adding the silane auxiliary agents obtained in the examples 1-3 and the comparative examples 1-3 into a PP+EPDM+T20 material, wherein the addition amount of the silane auxiliary agent is 2% of the PP+EPDM+T20 material, obtaining a detection sample 2, and performing relevant detection, wherein the data are shown in Table 2;
wherein the PP+T20 material is PP filled with 20% talcum powder; the PP+EPDM+T20 material is ethylene propylene diene monomer toughened PP containing 20 percent of talcum powder, and is commercially available.
TABLE 1
TABLE 2
Claims (1)
1. The preparation method of the precipitation-resistant silane auxiliary agent is characterized by comprising the following steps of:
(1) Placing the raw materials into an internal mixer for reaction to obtain a grafted product;
(2) Placing the grafted product obtained in the step (1) into a double-screw extruder, and granulating through extrusion to obtain the precipitation-resistant silane auxiliary agent;
the raw materials in the step (1) are 45 parts by weight of organosilicon raw rubber, 55 parts by weight of polypropylene and 0.18 part by weight of initiator;
the relative molecular weight of the organosilicon raw rubber is 30-45 ten thousand;
the polypropylene is random copolymer polypropylene, and the mass fraction of vinyl is 2.2%;
the initiator is cumene peroxide or tert-butylcumene peroxide, and the mass ratio of the cumene peroxide to the tert-butylcumene peroxide is 0.8:0.4;
the temperature of the internal mixer in the step (1) is 30 ℃;
the reaction time in the step (1) is 25min;
the temperature of the double-screw extruder in the step (2) is 175 ℃;
the rotating speed of the screw in the double-screw extruder in the step (2) is 750r/min;
the rotating speed of a feeding port in the double-screw extruder in the step (2) is 320r/min.
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