CN115558207A - Preparation method of anti-precipitation silane auxiliary agent - Google Patents
Preparation method of anti-precipitation silane auxiliary agent Download PDFInfo
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- CN115558207A CN115558207A CN202111560061.XA CN202111560061A CN115558207A CN 115558207 A CN115558207 A CN 115558207A CN 202111560061 A CN202111560061 A CN 202111560061A CN 115558207 A CN115558207 A CN 115558207A
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- silane
- polypropylene
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- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 title claims abstract description 46
- 229910000077 silane Inorganic materials 0.000 title claims abstract description 46
- 239000012752 auxiliary agent Substances 0.000 title claims abstract description 28
- 238000001556 precipitation Methods 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000004743 Polypropylene Substances 0.000 claims abstract description 57
- -1 polypropylene Polymers 0.000 claims abstract description 50
- 229920001155 polypropylene Polymers 0.000 claims abstract description 48
- 229920001971 elastomer Polymers 0.000 claims abstract description 18
- 239000005060 rubber Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 15
- KRDXTHSSNCTAGY-UHFFFAOYSA-N 2-cyclohexylpyrrolidine Chemical compound C1CCNC1C1CCCCC1 KRDXTHSSNCTAGY-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000003999 initiator Substances 0.000 claims description 14
- 229920005604 random copolymer Polymers 0.000 claims description 13
- FRIBMENBGGCKPD-UHFFFAOYSA-N 3-(2,3-dimethoxyphenyl)prop-2-enal Chemical group COC1=CC=CC(C=CC=O)=C1OC FRIBMENBGGCKPD-UHFFFAOYSA-N 0.000 claims description 8
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 7
- 239000005977 Ethylene Substances 0.000 claims description 7
- 239000002671 adjuvant Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 5
- 238000001125 extrusion Methods 0.000 claims description 5
- 238000005469 granulation Methods 0.000 claims description 5
- 230000003179 granulation Effects 0.000 claims description 5
- 229920001296 polysiloxane Polymers 0.000 claims description 5
- 150000002978 peroxides Chemical group 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 abstract description 14
- 229910052710 silicon Inorganic materials 0.000 abstract description 14
- 239000010703 silicon Substances 0.000 abstract description 14
- 238000007334 copolymerization reaction Methods 0.000 abstract description 6
- 238000005452 bending Methods 0.000 abstract description 5
- 239000002861 polymer material Substances 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 238000007790 scraping Methods 0.000 abstract 2
- 230000002349 favourable effect Effects 0.000 abstract 1
- 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 description 8
- 239000000155 melt Substances 0.000 description 8
- 230000003678 scratch resistant effect Effects 0.000 description 7
- QABUFWQCKDRYGJ-UHFFFAOYSA-N 1-tert-butyl-2-propan-2-ylbenzene;hydrogen peroxide Chemical compound OO.CC(C)C1=CC=CC=C1C(C)(C)C QABUFWQCKDRYGJ-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 230000035484 reaction time Effects 0.000 description 6
- 239000000654 additive Substances 0.000 description 5
- 239000004033 plastic Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 5
- 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 description 4
- 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
- 230000000996 additive effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000003921 oil Substances 0.000 description 3
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 3
- 229920002554 vinyl polymer 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
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 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
- 238000010309 melting process Methods 0.000 description 2
- 150000001282 organosilanes Chemical class 0.000 description 2
- 239000002245 particle Substances 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 1
- 239000004952 Polyamide Substances 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
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 230000000694 effects Effects 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
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000642 polymer Polymers 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 invention relates to the technical field of C08L high polymer materials, and particularly provides a preparation method of a precipitation-resistant silane auxiliary agent. According to the preparation method of the precipitation-resistant silane assistant, the random copolymerization polypropylene, the organic silicon crude rubber, the cumyl oxide and the tert-butyl cumyl peroxide are used as raw materials, the prepared silane assistant has a smooth surface and a good yield, and has good scraping resistance and precipitation resistance when being used in the polypropylene, so that the polypropylene has excellent scraping resistance, precipitation resistance, bending performance and tensile performance; meanwhile, the preparation method is simple and easy to operate, adopts a normal-temperature banburying method, obviously reduces the energy consumption, is environment-friendly and low in cost, and is favorable for industrial-grade large-scale production and sale.
Description
Technical Field
The invention relates to the technical field of C08L high polymer materials, and particularly 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 precision parts in the working process, higher requirements are put forward on the wear resistance and the scratch resistance of polypropylene. The occurrence of organosilicon additives with an anti-scratch effect provides a new method for improving the wear resistance and scratch resistance of polypropylene, but the organosilicon additives and scratch resistance agents in the prior art have poor compatibility with polypropylene and are easy to precipitate in a polypropylene system, so that the mechanical property of the polypropylene is reduced, and the application range of the polypropylene in various parts and composite materials is severely limited.
The patent publication No. CN113024814A discloses a bio-based polysiloxane scratch-resistant assistant, in the patent publication, chemical reagents such as low-hydrogen polysiloxane and hydrogenated cardanol are used as raw materials, and the prepared scratch-resistant assistant has good scratch resistance when used in a composite material, but the tensile strength and bending strength of the composite material used for the scratch-resistant assistant are not reflected.
The invention discloses a preparation method of a plastic scratch-resistant agent master batch, which is characterized in that maleic anhydride and polyamide are adopted to modify high-molecular-weight organic silicon, and the modified organic silicon and a smell-absorbing agent are introduced into resins such as PA, PE, PP and the like, so that the problems of poor dispersibility and adhesion of the plastic scratch-resistant agent master batch in the prior art are solved, but the smell-absorbing agent needs to be introduced in the scheme to reduce the taste of the scratch-resistant master batch, and the precipitation resistance of the master batch is not obviously reflected.
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 odor and precipitation resistance, has potential application value in the field of high polymer materials, particularly in the field of scratch-resistant high polymer master batches applied to polypropylene.
Disclosure of Invention
The invention provides a preparation method of a precipitation-resistant silane auxiliary agent, which comprises the following steps:
(1) Placing the raw materials in an internal mixer for reaction to obtain a grafting product;
(2) And (3) placing the grafting product obtained in the step (2) in a double-screw extruder, and performing extrusion granulation to obtain the anti-precipitation silane auxiliary agent.
As a preferable technical scheme of the invention, the raw materials in the step (1) comprise 40-50 parts by weight of organic silicon crude rubber, 50-60 parts by weight of polypropylene and 0.15-0.2 part by weight of initiator.
As a preferable technical scheme, the relative molecular weight of the organic silicon raw rubber is 30-60 ten thousand.
As a more preferable technical scheme, the relative molecular weight of the organic silicon crude rubber is 30-45 ten thousand.
In a preferred embodiment of the present invention, the polypropylene is a random copolymer polypropylene.
In a more preferred embodiment of the present invention, the ethylene mass fraction of the random copolymer polypropylene is 1.5 to 2.5%.
In a most preferred embodiment of the present invention, the ethylene mass fraction of the random copolymer polypropylene is 2.2%.
In a preferred embodiment of the present invention, the initiator is a peroxide initiator.
In a preferred embodiment of the present invention, 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 to 1): (0.2-0.6).
In a more preferred embodiment of the present invention, the mass ratio of the cumyl peroxide to the t-butylcumyl peroxide is 0.8:0.4.
as a preferred technical scheme of the invention, the temperature of the internal mixer in the step (1) is 25-35 ℃.
As a more preferable technical scheme of the invention, the temperature of the internal mixer in the step (1) is 30 ℃.
As a preferable technical scheme of the invention, the reaction time of the step (1) is 15-30min.
As a more preferable technical scheme of the invention, the reaction time of the step (1) is 25min.
The applicant finds that in the prior art, an organosilane auxiliary agent applied to plastics is easy to precipitate and stick, and the addition amount of the organosilane auxiliary agent to the plastics is large, so that the odor of a product is large, the mechanical properties of the plastics, such as tensile strength, bending strength and the like, can be influenced, and the application range of the silane auxiliary agent in a high-molecular composite material is limited. The applicant unexpectedly finds that when organosilicon crude rubber with a relative molecular weight of 30-45 ten thousand is used and the mass fraction of ethylene is 2.2% of the random copolymer polypropylene, due to the introduction of ethylene monomer with specific content, the stability of the random copolymer polypropylene is improved, the full degradation of the random copolymer polypropylene by cumene peroxide and tert-butyl cumene peroxide in the system is realized, the compatibility with the organosilicon crude rubber with a relative molecular weight of 30-45 ten thousand is promoted, the copolymerization degree between the random copolymer polypropylene and the organosilicon crude rubber is improved, the controllability of the molecular weight of an organosilicon additive is enhanced, the phenomenon that a silane additive is easy to separate out in a polypropylene system is avoided, if the silane additive is easy to separate out, the internal structure of the polypropylene system is damaged, the mechanical property of the polypropylene is influenced, and the scratch resistance of the polypropylene is reduced.
As a preferred technical scheme of the invention, the temperature of the double-screw extruder in the step (2) is 160-250 ℃.
As a more preferable technical solution of the present invention, the temperature of the twin-screw extruder in the step (2) is 175 ℃.
As a preferable technical scheme of the invention, 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 invention, 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 invention, 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 invention, the rotating speed of the feeding port in the twin-screw extruder in the step (2) is 320r/min.
The applicant unexpectedly finds that when the temperature of a double-screw extruder is strictly controlled to be 175 ℃, the rotating speed of a screw is 750r/min, and the rotating speed of a feeding port is 320r/min, the grafting rate of a grafting product is not influenced, the viscosity uniformity and the hardness of a melt can be improved, 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, the prepared silane auxiliary agent particles are smooth, have no scale or fall, and have excellent yield.
Compared with the prior art, the invention has the following beneficial effects:
1. the preparation method of the anti-precipitation silane auxiliary agent provided by the invention adopts organosilicon crude rubber with the relative molecular weight of 30-45 ten thousand, and the random copolymerization polypropylene with the ethylene mass fraction of 2.2 percent, wherein the mass ratio is 0.8:0.4, improves the migration of the random copolymer polypropylene to the surface of organic silicon under the action of cumyl peroxide and tert-butyl cumyl peroxide, has good dispersion uniformity of all components in a system, and avoids the phenomenon that a silane assistant is easy to separate out and stick in a polypropylene system;
2. according to the preparation method of the anti-precipitation 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 and medium molecular weight and the random copolymerization polypropylene in the system can be realized, the prepared silane auxiliary agent is added into the polypropylene, and the anti-precipitation performance of the silane auxiliary agent in the polypropylene can be improved on the basis of increasing the scratch resistance 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 be 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, the tensile strength and the bending strength of the silane auxiliary agent can be improved while the grafting rate of a grafting product is not influenced;
4. according to the preparation method of the precipitation-resistant silane auxiliary agent, the rotating speed of the screw is 750r/min, and when 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 of deformation and bamboo joint of the melt 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 particles have smooth surfaces and do not have the problems of scale or falling.
5. According to the preparation method of the anti-precipitation silane assistant, the random copolymerization polypropylene and the organic silicon raw rubber are used as main raw materials, under the action of cumyl oxide and tert-butyl cumyl peroxide, the silane assistant prepared by strictly controlling the banburying temperature and time and the temperature and the rotating speed in an extruder has excellent grafting rate, and has good scratch resistance and precipitation resistance when being used for polypropylene, so that the scratch resistance, precipitation resistance, bending strength and tensile strength of the polypropylene can be simultaneously considered; meanwhile, the preparation method adopts a normal-temperature banburying method, so that the energy consumption is obviously reduced, the environment is protected, the cost is low, and the industrial-grade large-scale production and sale are facilitated.
Detailed Description
Examples
Example 1
Embodiment 1 provides a method for preparing a bleed-out resistant silane adjuvant, comprising the steps of:
(1) Placing the raw materials in an internal mixer for reaction to obtain a grafting product;
(2) And (3) placing the grafting product obtained in the step (2) in a double-screw extruder, and performing extrusion granulation to obtain the precipitation-resistant silane auxiliary agent.
The raw materials in the step (1) comprise 45 parts by weight of organic silicon raw rubber, 55 parts by weight of polypropylene and 0.18 part by weight of initiator, wherein the relative molecular weight of the organic silicon raw rubber is 30-45 ten thousand, and the raw materials are purchased from Shanghai culvert point science and technology limited company;
the polypropylene is random copolymer polypropylene, is purchased from Dushan petrochemical company of China oil and gas Limited company, and has the model of Y-03 and the vinyl mass fraction of 2.2 percent;
the initiator is cumene hydroperoxide or tert-butyl cumene hydroperoxide, and the mass ratio of the cumene hydroperoxide to the tert-butyl cumene hydroperoxide is 0.8:0.4; cumene peroxide has CAS number 80-15-9; the CAS number of tert-butyl cumyl 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 a screw in the double-screw extruder in the step (2) is 550r/min;
and (3) the rotating speed of a feeding port in the double-screw extruder in the step (2) is 240r/min.
Example 2
Embodiment 2 provides a method for preparing a bleed-out resistant silane adjuvant, comprising the steps of:
(1) Placing the raw materials in an internal mixer for reaction to obtain a grafting product;
(2) And (3) placing the grafting product obtained in the step (2) in a double-screw extruder, and performing extrusion granulation to obtain the anti-precipitation silane auxiliary agent.
The raw materials of the step (1) comprise 45 parts by weight of organic silicon raw rubber, 55 parts by weight of polypropylene and 0.18 part by weight of initiator;
the organic silicon raw rubber has the relative molecular weight of 30-45 ten thousand and is purchased from Shanghai culvert point science and technology Limited;
the polypropylene is random copolymer polypropylene, is purchased from Dushan petrochemical company of China oil and gas Limited company, and has the model of Y-03 and the vinyl mass fraction of 2.2 percent;
the initiator is cumene hydroperoxide or tert-butyl cumene hydroperoxide, and the mass ratio of the cumene hydroperoxide to the tert-butyl cumene hydroperoxide is 0.8:0.4; cumene peroxide has a CAS number of 80-15-9; the CAS number of tert-butyl cumyl 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 a screw in the double-screw extruder in the step (2) is 850r/min;
and (3) the rotating speed of a feeding port in the double-screw extruder in the step (2) is 240r/min.
Example 3
Embodiment 3 provides a method for preparing a bleed-out resistant silane adjuvant, comprising the steps of:
(1) Placing the raw materials in an internal mixer for reaction to obtain a grafting product;
(2) And (3) placing the grafting product obtained in the step (2) in a double-screw extruder, and performing extrusion granulation to obtain the precipitation-resistant silane auxiliary agent.
The raw materials in the step (1) comprise 45 parts by weight of organic silicon raw rubber, 55 parts by weight of polypropylene and 0.18 part by weight of initiator;
the organic silicon crude rubber has the relative molecular weight of 30-45 ten thousand and is purchased from Shanghai culvert point science and technology limited company;
the polypropylene is random copolymer polypropylene, is purchased from Dushan petrochemical company of China oil and gas Limited company, and has the model of Y-03 and the vinyl mass fraction of 2.2 percent;
the initiator is cumene hydroperoxide or tert-butyl cumene hydroperoxide, and the mass ratio of the cumene hydroperoxide to the tert-butyl cumene hydroperoxide is 0.8:0.4 of the total weight of the mixture; cumene peroxide has CAS number 80-15-9; the CAS number of the tert-butyl cumyl 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 twin-screw extruder in the step (2) is 175 ℃;
the rotating speed of a 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 green gum has a relative molecular weight of 60 to 70 ten thousand.
Comparative example 2
Comparative example 2 the 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 agent obtained in the examples 1-3 and the comparative examples 1-3 into a PP + T20 material, wherein the adding amount of the silane auxiliary agent is 2% of that of the PP + T20 material to obtain a detection sample 1, and carrying out related detection, wherein the measured data are shown in a table 1;
adding the silane auxiliary agent obtained in the examples 1-3 and the comparative examples 1-3 into a PP + EPDM + T20 material, wherein the adding amount of the silane auxiliary agent is 2% of that of the PP + EPDM + T20 material, obtaining a detection sample 2, and carrying out related detection, wherein the measured data are shown in a table 2;
wherein the PP + T20 material is PP filled with 20% of talcum powder; the PP + EPDM + T20 materials are PP toughened by ethylene propylene diene monomer rubber and contain 20% of talcum powder, and are all purchased in the market.
TABLE 1
TABLE 2
Claims (10)
1. The preparation method of the anti-precipitation silane assistant is characterized by comprising the following steps:
(1) Placing the raw materials in an internal mixer for reaction to obtain a grafting product;
(2) And (3) placing the grafting product obtained in the step (2) in a double-screw extruder, and performing extrusion granulation to obtain the precipitation-resistant silane auxiliary agent.
2. The method for preparing the silane assistant according to claim 1, wherein the raw materials in the step (1) comprise 40-50 parts by weight of silicone raw rubber, 50-60 parts by weight of polypropylene and 0.15-0.2 part by weight of initiator.
3. The method for preparing the silane assistant according to claim 2, wherein the relative molecular mass of the silicone raw rubber is 30 to 60 ten thousand.
4. The method for preparing the silane assistant according to claim 2, wherein the polypropylene is a random copolymer polypropylene.
5. The method for preparing the silane assistant according to claim 2, wherein the ethylene mass fraction of the random copolymerized polypropylene is 1.5 to 2.5%.
6. The method for preparing the silane adjuvant according to claim 2, wherein the initiator is a peroxide initiator.
7. The method for preparing the silane assistant according to claim 6, wherein the peroxide initiator is cumene hydroperoxide or tert-butylcumyl peroxide, and the mass ratio of the cumene hydroperoxide to the tert-butylcumyl peroxide is (0.5-1): (0.2-0.6).
8. The process for preparing a silane adjuvant according to claim 1, wherein the temperature of the internal mixer in step (1) is 25-35 ℃.
9. The method for preparing the silane assistant agent according to claim 1, wherein the temperature of the twin-screw extruder in the step (2) is 160-250 ℃.
10. The method for preparing the silane assistant agent according to claim 1, wherein the rotation speed of the screw in the twin-screw extruder in the step (2) is 550-850r/min.
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