Polymeric composition

FIELD: chemistry.

SUBSTANCE: oxidised styrene-butadiene thermoplastic elastomer is used as the bonding agent, which has at its ends macromolecules of reactive carboxyl or hydroxyl groups, with a prevalence of the later; as the hardening agents of the polyisocyanates with a fraction of the total mass of the isocyanate groups not less than 30%, as the filler fine-dispersed mineral powders or pigments, as the modifying components - micro-reinforcing filler - wollastonite, as the plasticiser - dibutyl phthalate, additionally added is a curing agent - oil-thallous siccative and a stabiliser - styrenated diphenylamine BTC-150 or BC-30A; with the following ratio of components by mass %: oxidised styrene-butadiene thermoplastic elastomer 52.0-60.0; hardening agent polyisocyanate 7.0-9.0; hardening agent siccative 1.2-1.7; filler - fine-dispersed mineral powder or inorganic pigments 20.0-29.0; plasticiser - dibutyl phthalate 0.6-0.8; modified additive - wollastonite 6.0-8.0; phenol type stabiliser BTC-150 BC-30A 1.2-1.5, and the composition does not contain any organic solvents.

EFFECT: reduction in the shrinking deformation, increasing hardness, lowering the temperature of using the composition.

1 cl, 2 tbl, 13 ex

 

The invention relates to coatings industry and the construction industry and is used for manufacturing protective and coloring coating metal, concrete and other surfaces, bystrookupaemyh sealants. The invention solves the problem of obtaining a composition having a high ozone resistance, excellent waterproofing properties, good adhesion to various substrates, used in a wide temperature range, bystrozamorozhennogo at room temperature.

Known polymer composition adopted for the prototype [EN 2107706 C1, 27.03.98], consisting of butadiene-styrene thermoplastic elastomer, the modifying additive, filler and solvent. The specified composition as a binder contains butadiene-styrene thermoplastic elastomer, as modifying additives - polyisoprene content of 3,4-links 60-93%, aliphatic solvent in the following ratio, wt.%:

butadiene-styrene thermoplastic elastomer3-35
isoprene content of 3,4-links 60-93%65-97
aliphatic solvent200-1000.

In addition, the composition may further contain policital adhesive, filler and dye.

The criminal code of the above composition, along with high physical-mechanical characteristics, has the following disadvantages: low hardness, the ability to fully cure only at temperatures above 10°C, the presence of large amounts of solvent, causing shrinkage of the coating.

The present invention aims to reduce shrinkage strains due to the exceptions to the composition of the solvent, increasing the hardness, the lower temperature application.

This is achieved in that the polymer composition used for manufacturing protective and coloring coating of metal and concrete surfaces, bystrookupaemyh sealants and includes: a polymeric binder, hardener, filler and modifying additives, as a polymeric binder contains oxidized definiltely thermoplastic elastomer having at the ends of the macromolecules reactive hydroxyl and carboxyl end groups with a predominance of hydroxyl groups (hydroxyl number 33-38), as a hardener - polyisocyanates, with a content of isocyanate groups of at least 30%, as a catalyst - liquid oil-tall desiccant as filler - fine mineral powders or pigments, as modifying component, thixotropic additives, and dibutyl phthalate in the following ratio of components, wt.%:

oxidized definiltely TPR52,0...60,0
the curing agent is a polyisocyanate7,0...9,0
the curing catalyst - desiccant1,2 1,7...
the filler - fine mineral powders
or inorganic pigments29,0 20,0...
the plasticizer is dibutyl0,6...0,8
modifying additive - wollastonite6,0...8,0
the phenolic stabilizer type - MTC-150 or SU-30A1,2...1,5,

moreover, the composition does not contain organic solvents.

To obtain a binder proposed composition used divinylacetylene thermoplastic elastomers (divinylacetylene rubber with a styrene content of 30% the following brands: DST-PS, DST-R-01 and DST-30-01 produced according to TU 38.40327-90, THE 38.40370-91.

These divinylacetylene rubbers are block copolymers with a low ash content, organic acids and Soaps, is easily dissolved in many solvents, are produced in the form of chips with a size of 1...2 mm, which eliminates the need for pre-softening or cutting before dissolution. Tear resistance reaches the maximum at temperatures below 60° C and decreases at higher temperatures. Srednesemennyh molecular weight ranges from 85000 to 95000. Polybutadiene blocks give elasticity to the specified rubbers at low temperatures. Low-temperature properties apply to the mixture, brewed based on it.

As the solvent used for the butadiene-styrene thermoplastic elastomers used toluene, manufactured according to GOST 5789-78.

To obtain a binder held the oxidation source butadiene-styrene thermoplastic elastomer. The oxidation was performed in a laboratory sealed mixer, equipped with a system of air supply under pressure, a jacket for heating the mixture, and the agitator with gear. In the mixer was downloaded an estimated quantity of powdered DST, solvents and catalysts for the reaction of oxidation - peracetic acid and desiccant triple fused calculation of 1-3% by weight of the polymer. Carrying out the indicated reactions in the environment peracetic acid allows you to get the original rubber reactive end groups containing active oxygen atoms. The oxidation process was evaluated by changing the values of the characteristic viscosity of the mixture. Optimal conditions for the specified reaction following: pressure (above atmospheric) 0.6 MPa, the temperature of the mixture to 150°With time the conduct is of 3 hours at a rotor speed of the mixer 60 rpm As a result of oxidation reactions received a binder with a dynamic viscosity 20-35 PZ at a temperature of 25°With rebeccadipietro of Heppler. Titration of the obtained binder showed the presence of terminal hydroxyl and carboxyl groups with a predominance of hydroxyl groups (hydroxyl number 33-38). The presence of these groups in the binder allows curing using polyfunctionally hardeners - polyisocyanates with mass fraction of isocyanate groups of at least 30%.

For preparation of compositions used:

- hardeners - polyisocyanates with mass fraction of isocyanate groups of at least 30% and a conditional viscosity at 20°With no more than 60 with, for example, polyisocyanates brands P-25, PM-25, produced by THE 2472-002-72311668-2004;

the phenolic stabilizers of the type for the production of synthetic rubbers - stillyoung diphenylamine PTS-150 (TU 38.103613-86) or SU-30A (TU 38.40367-87);

- liquid oil-tall desiccant SEP-35 (TU-205-2966756-09-93);

- microarray filler wollastonite brand Voxel-100 manufactured by LLC "Ladoga Him" with the content of particles with a size of 10 μm - 90...97 wt.%, size 20 μm - 3...10 wt.%;

- pigments of red, blue, yellow, produced by STU 45-1735-63, GOST 13483-68, STU 11-965-64;

- fine aggregate - white soot marks BC-50 or BS-100.

Technology of preparation of the compositions of the following is relevant: after cooling the oxidized butadiene-styrene thermoplastic elastomer 50...60° With the mixer was introduced stabilizer under continuous stirring for 10...15 minutes, then the mixer was introduced desiccant and dibutyl phthalate. The hardener was introduced by reducing the temperature of the mixture up to 30°With, then portions were injected microarray filler and, if necessary, the desired pigment. The amount of pigments and microarrays filler is determined from the conditions of use compositions (spray composition, protective coating, sealant). Mixing the binder with a filler held in a high speed mixer equipped with a propeller stirrer until a homogeneous mass is desired viscosity.

The compounds of the inventive mixtures and prototype are listed in table 1. Main physical and mechanical characteristics of the proposed material and the prototype are presented in table 2.

Compounds 1-8 prototype compounds 9-13 given to justify the choice of the components when used for different purposes - coloring compounds, protective coatings, sealants.

Analysis of the data presented in tables 1 and 2, allows to conclude that the objective of the invention is achieved when the mixing ratio shown in table 1.

The presence in the inventive composition dibutyl phthalate facilitates blending of pigments and fillers in a polymeric binder. Microarray filler wollastonite due to needle the form of grains, with a pronounced spatial-geometric anisotropic, increases the magnitude of the relative elongation of the material without reducing the tensile strength increases hardness values.

The minimum number of unsaturated bonds in the oxidized butadiene-styrene thermoplastic elastomer, together with the use of a phenolic stabilizer type increases the ozone resistance of finished products and, therefore, prolongs the service life of protective coatings of the proposed material.

- 10
Table 1

Compositions of materials
IngredientThe placeholderThe inventive compositions
12345678910111213
Wt. partsWt.%
Butadiene-styrene thermoplastic elastomer marks:
DST-30310-2035353535-----
DMT-30--35----------
Oxidized butadiene-styrene thermoplastic elastomer marks:
DST-RS-55-60
DST-R-01---------54--52
DST-30-01---------58--
3,4-Polyisoprene content of 3,4-links:
60,0%----65--------
80.2%of9765806565
93,0%-90-----65-----
The polyisocyanates:
P-25-----7--98
PM 50-25---------97--
Desiccant
SEP-35--------1,21,51,21,71,6
Carbon black marks:
P----2010------
P---10---------
Alkylphenolethoxylate
resin---510--10-----
brand 101-----1015------
brand 101 LCȊ
White black
brand BS-50---20-301020272420
brand BS-100----20---2427
Dibutyl-------0,60,720,60,80,7
The wollastonite Voxel-100--------8,06,07,07,07,0
Stillyoung diphenylamine
PTS-150-----1,31,21,5
or SU-30A--------1,21,5
Titanium white-------5-2,481--
Pigments----2--1-1--2
Gasoline500--10001000500200-----/td> -
White spirit-500500----------
Total100100100100100

Table 2

Physico-mechanical characteristics
FeaturesThe placeholderThe inventive compositions
910111213
The tensile strength, MPa5...91189912
Elongation, %500...600680770700680600
Tear resistance, kN/m50...606052555865
Hardness shore a, unit85...90 9087858892
The resistance to peeling of steel, N/m4-776569
Water absorption, % (7 day). 20°)0,2-0,40,20,40,50,40,2
Ozone resistance (time to cracking)oz=1·10-4%strain 20%, temperature +30°After 14 h no cracksAfter incubation for 48 h no cracks
The cure time, hours0,2-10,50,20,60,40,4
Operational temperature range, °-50...+100-50...+100

Polymer composition, wherein as the polymer binder used oxidized definiltely thermoplastic elastomer having at the ends of the macromolecules reactive carboxyl and hydroxyl groups, with a predominance of the latter; as a hardener - polyisocyanates with mass fraction of isocyanate groups of at least 30%, as a filler - fine mineral powders or pigments, as modificados the x components microarray filler is wollastonite, as a plasticizer is dibutyl phthalate, impose additional curing catalyst - liquid oil-tall drying agent and stabilizer - stillyoung diphenylamine PTS-150 or SU-30A in the following ratio, wt.%:

oxidized definiltely TPRwith 52.0-60.0 sec
the curing agent is a polyisocyanate7,0-9,0
the curing catalyst - desiccant1,2-1,7
the filler - fine mineral powders or
inorganic pigments20,0-29,0
the plasticizer is dibutyl0,6-0,8
modifying additive - wollastonite6,0-8,0
the phenolic stabilizer type - MTC-150 VS-30A1.2 to 1.5,the

moreover, the composition does not contain organic solvents.



 

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