JP4236700B2 - Compositions used for coating and sealing of treated surfaces - Google Patents

Description

[0001]
Field of the Invention The present invention is an isocyanate curable polymer, an isocyanate curing agent, to compositions used for Kotin grayed及 beauty sealing of the treated surface comprising an aliphatic polyether glycol and rubber.
[0002]
The basic purpose of the composition of the present invention is to provide a sealant for water and other liquids in point sealing of pipe joints, roffing, ceramic tiles, metal sheets, etc., as a coating on surfaces subject to corrosion and mechanical attack. It is to obtain a composition that is very resistant to mechanical wear and attack by chemicals including water.
[0003]
It is an object of the present invention to obtain a rapid initial polymerization of a portion of the isocyanate to avoid dripping or flowing of the composition applied by spraying or other methods.
[0004]
Another object of the present invention is to obtain the non-sedimentability of a composition comprising rubber particles that tend to settle during storage.
[0005]
Yet another object of the present invention is to obtain a non-moisture sensitive composition that can be applied under wet conditions.
[0006]
SE-A-7709649-3 is a corrosion-resistant coating composition specifically for protecting rust on the exterior of a vehicle chassis, comprising a polyurethane polymer, waste rubber, anhydrous black coal tar, and a zeolite desiccant. Things are listed. This composition generally serves its purpose but has several drawbacks due to the strong smell of black coal tar. That is, use in a more limited space is hindered, and therefore a well-ventilated space is required at the time of application. In addition, black coal tar often results in a black coating and this fact is often unimportant and often unacceptable, and if selected instead, a colored product with a colored pigment is required. In addition to these disadvantages, which are certain cosmetic properties, higher wear resistance, resistance to chemicals, especially resistance in alkaline environments, and temperature stability are required.
[0007]
The above problems are: rubber having a particle size of 0.4 mm or less and present in an amount of 50 wt% or less, 40 to 55 wt% polyhydroxy type isocyanate curable polymer base, 18 to 30 wt% isocyanate cure And a composition comprising 1 to 5% by weight of an aliphatic polyether glycol.
[0008]
Other features are apparent from the appended claims.
[0009]
The isocyanate curable Po Rimmer, preferably isocyanate curable polymer; is a DESMOPHEN115 0, isocyanate curable epoxy polymers can also be used.
[0010]
Other isocyanate curable polymer which can be cured by isocyanate preparative hardening agent is different polyol molecular weight is 200 or more, a polyester base. Other polymeric materials, primarily dissolved in ketone or glycol ethers, epoxy resins cured using isocyanate preparative hardening agents (e.g. DESMODUR) or amino group active hardener. Suitable epoxy resins have a molecular weight of 1000 or greater.
[0011]
The aliphatic polyether glycol used can be an aliphatic glycol or something simpler, such as ethylene glycol, diethylene glycol, triethylene glycol.
[0012]
All types of rubber can be used as the rubber material. For example, waste rubber, waste rubber tires, raw rubber, and other rubber qualities.
[0013]
Thus, 20-40% by weight rubber powder, suitably less than 0.4 mm, preferably 0.05-0.2 mm waste rubber, 40-50% polymer base, 1-5% fat by weight It has been found that an aliphatic polyether glycol base and 18-25% by weight isocyanate curing agent provide good products within the scope of the present invention. Accordingly, these compositions have very high elasticity and wear resistance in the cured state. If the polyester base contains moisture, a zeolite desiccant should be added, or active aluminum oxide or basic aluminum silicate.
[0014]
The object of the present invention is achieved by adding 0.1 to 1.0% by weight of alicyclic amine based on the total amount of the composition.
[0015]
Thus, rapid initial polymerization can be obtained within a few seconds after the entire composition is applied to the surface, thereby eliminating the flow and dripping of the composition from the treated surface.
[0016]
In a preferred embodiment, the alicyclic amine is 3,3-dimethyl present in an amount of 0.1 to 1.0% by weight, preferably 0.3 to 0.7% by weight, based on the total amount of the composition. Consists of -4,4-diaminodicyclohexylmethane.
[0017]
The cycloaliphatic amine reacts with a portion of the isocyanate to rapidly increase viscosity before the isocyanate and isocyanate curable polymer react to form the final coating.
[0018]
In order to achieve non-sedimentation of the stored composition, the composition can be further rendered thixotropic by the addition of soy derivatives. The soy derivative is present in an amount of about 0.5% by weight of the total composition.
[0019]
In another object of the invention, the composition is rendered non-moisture sensitive by the addition of a water absorbent such as aluminum silicate or zeolite. Although the isocyanate-polyurethane system is moisture sensitive, this allows the composition to be applied in humid locations and eliminates the risk of foaming. The water absorbent is optionally added in an amount of 5 to 10% by weight, depending on the wet conditions present in the concrete body, for example when sealing the construction of roads and bridges.
[0020]
Example 1
40 parts by weight of waste rubber having a particle size of 0.1 to 0.2 mm were mixed with 39.5 parts by weight of DESMOPHEN 1150 and 2 parts by weight of polyether glycol (triethylene glycol) and 0.5 parts by weight of 3,3-dimethyl- Mix homogeneously with a mixture of 4,4-diaminodicyclohexylmethane. The isocyanate bets hardening agent 18 parts by weight of this mixture (DESMODUR), for all compositions, for example, when applied to concrete or metal surface, were added for the curing of the polymer.
[0021]
The product (A) of Example 1 above was tested for wear resistance, heat resistance, adhesion to steel, and resistance to chemicals, and the product (B) of Example SE-A-7709649-3 Compared.
[0022]
Abrasion resistance Plates with the above coatings were treated with 200 g of stone in a tumbler for 5 days (120 hours). The amount of wear of the material expressed in mm ³ was measured.
A = 19mm ³
B = 105mm ³
A cylindrical specimen of each product was pressed onto an emery cloth having 60 particles per cm ^{3 at} a pressure of 5 N and a length of 20 m, and the amount of wear was measured.
A = 145mm ³
B = 470mm ³
[0023]
Heat resistance The coated plates were vertically applied for 2 days (48 hours) at different temperatures. The sample / plate was then acclimated to room temperature (20 ° C.) and checked visually.
A = endure up to 150 ° C. B = end up to 80 ° C.
Adhesion to steel To examine adhesion, the coating on steel was pulled and tested.
A = endured to 4.0 Mpa before failure B = endured to 0.8 Mpa before failure
Chemical resistance Different oils were applied to the test coatings for each product. Thereby, although sample B miscolored all the liquids, sample A did not produce miscoloration at all. When tested in an acidic aqueous environment (HCl 30%; HNO ₃ 10%; H ₂ SO ₄ 10% or CH ₃ COOH 50%), the resistance was almost the same. Sample A was better in an alkaline aqueous environment (NaOH or NH ₄ OH).
[0026]
Application Sample A can form a thick layer (2.5-3 mm) on a vertically hung test plate, while sample B is only 1.5 mm.
[0027]
Flow The composition of the present invention was applied to a vertically hung metal sheet to form a 1.5 mm thick layer, and the composition (B) was applied with the same layer thickness of 1.5 mm. Compared. The flow of the two compositions was investigated by simply measuring the movement of the lower end of the application area.
A = 0.5mm
B = 10mm
Therefore, the addition of alicyclic amine significantly improved non-flowability.
[0028]
For the production of the composition according to the invention, the product is preferably placed under vacuum, which further improves the wear resistance, chemical resistance in particular. Furthermore, aging resistance, moisture resistance and tensile strength are improved. The pressure in the vacuum process to exclude air should be 0.8 bar, but in the case of very viscous compositions it can be further reduced to 0.5-0.6 bar.
[0029]
Application of the composition can take place in different ways, for example by simple manual application, by mechanical application and by high-pressure spraying. In the case of high-pressure spraying, it is appropriate to use an improved two-component conventional high-pressure spraying device. The composition other than the hardener and the hardener are combined in front of the outlet of the mixing tube (mixer) and sent to the spray gun via a heat taped high pressure hose. The pressure on the composition should be high so that a well-dispersed spray is obtained (nebulized), with a normal composition viscosity of 160-200 kg / cm ³ and a temperature of 40 It is higher than ° C, preferably 40-80 ° C, more preferably 45-60 ° C.
[0030]
Usually, the viscosity of the composition is such that it cannot be drawn into the apparatus at room temperature by a high pressure pump. Therefore, a pressure plate is provided in the high-pressure spraying device, and is slip-fitted into the container in which the composition is prepared while sucking.
[0031]
Thereby, the pressure plate is pushed down mechanically, pneumatically or hydraulically into the preparation vessel, pushing the composition up to the high-pressure spraying device.
[0032]
In order to increase the degree of cure of the composition, a curing reaction accelerator may be added in an amount of 0.1 to 0.5% by weight. An example of such an accelerator is dibutyl distannnium dilaurate or the corresponding lead compound.
[0033]
In order to reduce the risk of ignition, flame retardants such as phosphite compounds can also be added to the composition in amounts of 5 to 15% by weight. NowgardV-4 is an example of a flame retardant.
[0034]
This composition can be improved in thixotropy by adding an appropriate gelling substance.

Claims (4)

A composition used for Kotin grayed processing surface, 40 to 50 wt% of the aliphatic isocyanate curing other than polyether glycol polymer and 18 to 25% by weight of isocyanate curing agent, 1-5 wt% 0.1 to 1.0% by weight of 3, including an aliphatic glycol, ethylene glycol, diethylene glycol or triethylene glycol, and 20 to 40% by weight of rubber having a particle size of less than 0.4 mm, which further improves non-flowability . A composition comprising an alicyclic amine composed of 3-dimethyl-4,4-diaminodicyclohexylmethane and a soybean derivative imparting non-sedimentation. A composition used for sealing a treated surface, comprising 40-50% by weight of an isocyanate curable polymer other than an aliphatic polyether glycol and 18-25% by weight of an isocyanate curing agent, 1-5% by weight 0.1 to 1.0% by weight of 3,3 comprising aliphatic glycol, ethylene glycol, diethylene glycol or triethylene glycol and 20 to 40% by weight of rubber with a particle size of less than 0.4 mm, further improving non-flow properties -A composition comprising an alicyclic amine consisting of dimethyl-4,4-diaminodicyclohexylmethane and soybean derivatives imparting non-sedimentation. 3,3-dimethyl-4,4-claim 1 or 2 composition according comprises diamino dicyclohexyl methane derivatives. The composition according to any one of claims 1 to 3 , further comprising aluminum silicate for imparting moisture insensitivity to the composition.