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A kind of SBR styrene-butadiene rubber asphalt modifier and preparation method thereof

A technology of asphalt modifier and styrene-butadiene rubber, which is used in building components, building insulation materials, buildings, etc., can solve the problem of poor compatibility of asphalt, difficult compatibility of coating agent with asphalt, and no improvement of modified asphalt performance. and other problems, to achieve the effects of improved thermal storage stability, stable micronization process, and improved bonding performance

Active Publication Date: 2021-06-04
山东海方橡胶科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have disadvantages such as high energy consumption, low tensile strength of modifier-modified asphalt produced, and easy segregation of modifier and asphalt during thermal storage.
Chinese patent ZL93115289.5 involves cutting the general-purpose synthetic SBR styrene-butadiene rubber into small granules and using a small amount of water as the release agent or the condensed water-containing fluffy body taken from the production line, adding it to the solvent (rubber filling oil), and then heating up and dehydrating. Made SBR styrene-butadiene rubber masterbatch filled with 65%~90% oil; the modified agent prepared by this patent has low tensile strength after asphalt modification, and the problems of easy segregation between modifier and asphalt during thermal storage are still unsolved
A method is disclosed in Chinese patent ZL97110667.3, using general-purpose styrene-butadiene rubber emulsion as raw material, styrene and maleic anhydride are polymerized into a copolymer as coating agent, superfine calcium carbonate is used as release agent, and coagulant is added. into a powdered styrene-butadiene rubber; the coating agent in this patent is too polar and incompatible with asphalt. to the role of modified asphalt
Chinese patent ZL97111343.2 mentions that the styrene-butadiene rubber emulsion is pre-crosslinked and then grafted with styrene, acrylonitrile, acrylate and other monomers to modify the styrene-butadiene rubber, adding a copolymer of styrene and maleic anhydride As a coating agent for coagulation, a modified styrene-butadiene rubber product is obtained; the coating agent in this patent is difficult to dissolve with asphalt, and a large amount of grafted polar monomers make the modified styrene-butadiene rubber difficult to Soluble in asphalt, so when used in modified asphalt, it hardly improves the performance of modified asphalt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Vulcanization graft modification of general-purpose synthetic styrene-butadiene rubber emulsion

[0030] 1.1 Add 2,791 grams of 1500-type styrene-butadiene rubber emulsion with a solid content of 21.5% into the reactor, and start stirring at a speed of 150r / min.

[0031] 1.2 Add 64 grams of disproportionated potassium abietate soap with a concentration of 25%, 3.3 grams of benzoyl peroxide, 22 grams of diphenylmethane diisocyanate (MDI), isopropyl dioleic acid acyloxy (diisooctyl phosphate Oxygen) titanate 24 grams, 1% concentration of sodium metabisulfite aqueous solution 30 grams.

[0032] 1.3 After the addition, stir for 50 minutes at 30°C and a stirring speed of 150r / min to fully disperse the material evenly.

[0033] 1.4 Heat up to 65°C and react at 65°C for 4 hours to obtain cross-linked grafted styrene-butadiene rubber emulsion.

[0034] 2) Micronization of cross-linked grafted styrene-butadiene rubber

[0035] 2.1 Add 1,500 grams of cross-linked grafted 15...

Embodiment 2

[0043] 1) Vulcanization graft modification of general-purpose synthetic styrene-butadiene rubber emulsion

[0044] 1.1 Add 2,715 grams of 1502-type styrene-butadiene rubber emulsion with a solid content of 22.1% into the reactor, and start stirring at a speed of 150r / min.

[0045] 1.2 Add 48 grams of disproportionated potassium abietate soap with a concentration of 25%, 4.5 grams of dicumyl peroxide, 12 grams of triallyl isocyanurate (TAIC), isopropyl dioleic acid acyloxy (di 42 grams of isooctyl phosphate acyloxy) titanate, 20 grams of 1% sodium metabisulfite aqueous solution.

[0046] 1.3 After the addition, stir for 30 minutes at 35°C and a stirring speed of 180r / min to fully disperse the material evenly.

[0047] 1.4 Heat up to 66°C and react at 65°C for 5 hours to obtain the cross-linked grafted styrene-butadiene rubber emulsion.

[0048] 2) Micronization of cross-linked grafted styrene-butadiene rubber

[0049] 2.1 Add 1500 grams of cross-linked branched 1502 type sty...

Embodiment 3

[0057] 1) Vulcanization graft modification of general-purpose synthetic styrene-butadiene rubber emulsion

[0058] 1.1 Add 2,927 grams of 1502-type styrene-butadiene rubber emulsion with a solid content of 20.5% into the reactor, and start stirring at a speed of 240r / min.

[0059] 1.2 Add 100 grams of fatty acid potassium soap with 20% concentration, 1.2 grams of dicumyl hydroperoxide, 18 grams of toluene diisocyanate (TDI), 12 grams of isopropyl trioleate acyloxy titanate, 1% concentration of 45 grams of sodium bisulfite aqueous solution.

[0060] 1.3 After the addition, stir for 60 minutes at 25°C and a stirring speed of 240r / min to fully disperse the material evenly.

[0061] 1.4 Heat up to 73°C and react at 70°C for 4 hours to obtain cross-linked grafted styrene-butadiene rubber emulsion.

[0062] 2) Micronization of cross-linked grafted styrene-butadiene rubber

[0063] 2.1 Add 1500 grams of cross-linked branched 1502 type styrene-butadiene rubber emulsion with a solid...

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Abstract

An SBR styrene-butadiene rubber asphalt modifier and a preparation method thereof belong to the technical field of asphalt modification. It is characterized in that the composition of raw materials by weight is: 100 parts of modified styrene-butadiene rubber emulsion (based on the weight of dry rubber), 0.1-1 part of anti-aging agent, 5-10 parts of release agent, and 3-6 parts of dicyandiamide formaldehyde condensate and 2 to 6 parts of aluminum potassium sulfate; the preparation steps are: synthesis of vulcanized graft modification of styrene-butadiene rubber emulsion, micronization of cross-linked grafted styrene-butadiene rubber, adding cross-linked grafted styrene-butadiene rubber emulsion in the coagulation kettle; Add anti-aging agent and release agent in sequence; add dicyandiamide formaldehyde condensate to obtain colloidal particle suspension containing release agent, and then transfer it to the aging kettle; add aluminum potassium sulfate to the aging kettle; dehydrate, grind and dry Instantly. The invention not only has low-temperature performance, ductility and bonding performance, but also greatly improves the viscosity-toughness, high-temperature performance and anti-aging performance of the modified asphalt.

Description

technical field [0001] An SBR styrene-butadiene rubber asphalt modifier and a preparation method thereof belong to the technical field of asphalt modification. Background technique [0002] SBR styrene-butadiene rubber modified asphalt has outstanding low-temperature performance, ductility and bonding performance. Compared with base asphalt, the high-temperature performance, viscosity toughness, toughness and anti-aging performance of modified asphalt are also improved. At present, SBR styrene-butadiene rubber asphalt modifiers at home and abroad are polymerized at low temperature (5°C) with butadiene and styrene as polymerized monomers, rosin acid soap or fatty acid soap as emulsifier, and combined with styrene at 23.5± 1% styrene-butadiene rubber raw material for production. Because the tensile strength of styrene-butadiene rubber is relatively small, the tensile strength, viscous toughness, and toughness indicators of modified asphalt will be low; the proportion of butad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L95/00C08L51/04C08L15/00C08L61/22C08K13/02C08K5/18C08K5/29C08K5/13C08K5/3437C08F279/02C08F226/06
Inventor 李洪强王涛李美霞
Owner 山东海方橡胶科技有限公司
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