阅读说明：本技术 一种可喷涂无溶剂型双组份聚氨酯腻子及其制备方法和使用方法 (Sprayable solvent-free two-component polyurethane putty and preparation method and use method thereof ) 是由 孟祥侠 于 2020-07-24 设计创作，主要内容包括：一种可喷涂无溶剂型双组份聚氨酯腻子,包括低粘度的无溶剂生物基树脂,低粘度的多异氰酸酯类固化剂,使整个涂料混合体系的粘度较低；另配方体系中引入端羟基聚丁二烯—丙烯腈树脂,以提升体系对金属底材的湿附着力,柔韧性,进而大大的提升体系的防腐性能。本发明使用的树脂为无溶剂大豆油基和蓖麻油基树脂,不存在任何的挥发成分,其它组分为无机粉体,整个配方体系中不存在任何的低沸点有机挥发物,因此更为环保,且没有任何的易燃易爆的隐患；本发明较现有解决方案,实现了底漆、腻子和中涂的三效合一,大大地减少了施工环节,提高了施工效率,降低了单位人工成本；本发明的聚氨酯材料具有更好的冷温性能,大大提高了修复质量。(A sprayable solvent-free two-component polyurethane putty comprises low-viscosity solvent-free bio-based resin and low-viscosity polyisocyanate curing agent, so that the viscosity of the whole coating mixing system is low; in addition, hydroxyl-terminated polybutadiene-acrylonitrile resin is introduced into the formula system to improve the wet adhesive force and flexibility of the system to metal substrates, so that the corrosion resistance of the system is greatly improved. The resin used in the invention is solvent-free soybean oil-based resin and castor oil-based resin, no volatile component exists, the other components are inorganic powder, and no low-boiling-point organic volatile matter exists in the whole formula system, so that the invention is more environment-friendly and has no flammable and explosive hidden trouble; compared with the existing solution, the invention realizes the three-effect integration of the primer, the putty and the middle coating, greatly reduces the construction links, improves the construction efficiency and reduces the labor cost of units; the polyurethane material provided by the invention has better cold-temperature performance, and the repair quality is greatly improved.)

1. The sprayable solvent-free two-component polyurethane putty is characterized by comprising the following two components in parts by mass:

firstly, component A:

II, component B:

curing agent

Wherein the mass ratio of the component A to the component B is as follows: 5-8: 1.

2. The sprayable solventless two component polyurethane caulk of claim 1 wherein the thixotropic agent is at least one of fumed silica, hydrogenated castor oil, and attapulgite.

3. The sprayable solventless two component polyurethane caulk of claim 1 wherein the wetting and dispersing agent is BYK ANTI TERRA U.

4. The sprayable solventless two-component polyurethane caulk of claim 1 wherein the organometallic catalyst is at least one of organotin, organobismuth, organozirconium.

5. The sprayable solvent-free two-component polyurethane caulk OF claim 1, wherein the water scavenger is at least one OF molecular sieve active powder, OF, and oxazolidine.

6. The sprayable solventless two component polyurethane caulk of claim 1, wherein the curing agent is a low viscosity HDI trimer or HDI allophanate isocyanate curing agent.

7. The method of making a sprayable solventless two-component polyurethane caulk of claim 1 comprising the steps of:

s1: pouring resin into a drawn cylinder, adding a wetting dispersant and a defoaming agent, and then uniformly mixing with a high-speed dispersant;

s2: firstly adding calcium carbonate under low-speed stirring of a high-speed dispersion machine, then uniformly dispersing at a high speed, and then adding talcum powder for uniformly dispersing at a high speed;

s3: adding the rest other components, uniformly dispersing, and vacuumizing for defoaming to obtain a component A;

s4: respectively packaging the component A and the component B, wherein the mass ratio of the component A to the component B is 5-8: 1.

8. the method of using the sprayable solventless two-component polyurethane caulk of claim 6, comprising the steps of:

b1: pouring the component B into a barrel filled with the component A, and uniformly stirring the materials by using an electric stirrer;

b2: uniformly spraying the mixed material prepared in the step B1 on the surface to be shaped by using putty spraying equipment;

b3: and (4) using a scraper to perform local trimming, and polishing after the putty is dried.

Technical Field

The invention relates to a finishing material, in particular to sprayable solvent-free two-component polyurethane putty and a preparation method and a use method thereof.

Background

Before coating the exterior of mechanical equipment such as large vehicles, large appearance defects on the surface of a base material need to be repaired so as to achieve the flatness and consistency of the design. The existing solutions are as follows:

the repairing material is paste putty which is prepared by dispersing unsaturated polyester as basic resin, styrene as reactive diluent and talcum powder as main filling powder and has high thixotropy and good polishing performance after drying, and is commonly called putty. The other is two-component polyurethane putty which is prepared by adopting polyester resin as main resin, adding a large amount of filler and auxiliary agent, and then matching isocyanate resin as curing agent, and the product has great technical difficulty at present and can be rarely seen in the market; the two construction modes of the modified putty are scraping coating by using a scraper, which has higher requirements on the scraping coating skill level of personnel, larger labor intensity and lower efficiency; the sprayable putty is available abroad and pushed on the market by people in China, but the technology, materials, application and other reasons can not be successfully popularized.

Disclosure of Invention

The invention aims to provide novel sprayable solvent-free two-component polyurethane putty, which selects low-viscosity solvent-free bio-based resin as basic grinding resin and low-viscosity polyisocyanates as curing agents (low-viscosity HDI tripolymer, low-viscosity HDI allophanate isocyanate curing agent and the like), so that the viscosity of the whole paint mixing system is lower; in addition, hydroxyl-terminated polybutadiene-acrylonitrile resin is introduced into the formula system to improve the wet adhesive force and flexibility of the system to metal substrates, so that the corrosion resistance of the system is greatly improved.

The technical scheme of the invention is as follows:

a sprayable solvent-free type double-component polyurethane putty comprises the following two components in parts by mass:

firstly, component A:

II, component B:

curing agent

Wherein the mass ratio of the component A to the component B is as follows: 5-8: 1.

As a preferred embodiment, the thixotropic agent is at least one of fumed silica, hydrogenated castor oil, and attapulgite.

Preferably, the wetting dispersant is BYK ANTI TERRA U.

In a preferred embodiment, the organometallic catalyst is at least one of organotin, organobismuth, and organozirconium.

As a preferable technical scheme, the water removal agent is at least one OF molecular sieve active powder, OF and oxazolidine.

As a preferred technical scheme, the curing agent is a low-viscosity HDI tripolymer or HDI allophanate isocyanate curing agent.

The invention also provides a preparation method of the sprayable solvent-free two-component polyurethane putty, which comprises the following steps:

s1: pouring resin into a drawn cylinder, adding a wetting dispersant and a defoaming agent, and then uniformly mixing with a high-speed dispersant;

s2: firstly adding calcium carbonate under low-speed stirring of a high-speed dispersion machine, then uniformly dispersing at a high speed, and then adding talcum powder for uniformly dispersing at a high speed;

s3: adding the rest other components, uniformly dispersing, and vacuumizing for defoaming to obtain a component A;

s4: and respectively packaging the component A and the component B, wherein the mass ratio of the component A to the component B is 5-8: 1.

The invention also provides a using method of the sprayable solvent-free type double-component polyurethane putty, which comprises the following steps:

b1: pouring the component B into a barrel filled with the component A, and uniformly stirring the materials by using an electric stirrer;

b2: uniformly spraying the mixed material prepared in the step B1 on the surface to be shaped by using putty spraying equipment;

b3: and (4) using a scraper to perform local trimming, and polishing after the putty is dried.

Compared with the prior art, the invention has the beneficial effects that:

the resin used in the invention is solvent-free soybean oil-based resin and castor oil-based resin, no volatile component exists, the other components are inorganic powder, and no low-boiling-point organic volatile matter exists in the whole formula system, so that the environment-friendly composite material is environment-friendly and has no flammable and explosive hidden danger;

compared with the existing solution, the invention realizes the three-effect integration of the primer, the putty and the middle coating, greatly reduces the construction links, improves the construction efficiency and reduces the labor cost of units;

compared with unsaturated putty, the mechanical properties, especially the cold temperature properties of the polyurethane material are greatly improved, so that the repair quality is greatly improved;

the proposal of introducing hydroxyl-terminated polybutadiene-acrylonitrile resin solves the problems of excellent environmental adaptability and good corrosion resistance to the substrate;

the problem that the low-viscosity vertical surface high-film-thickness spraying does not sag is solved; the problem that a dry film is not easy to polish due to the fact that a low-viscosity system uses more resin is solved; the invention solves the problem of good corrosion resistance to metal substrates; successfully reducing the construction viscosity of the system to 500-2000 cps;

after the solvent-free two-component polyurethane primer-free putty and the intermediate coating putty are used in the whole process, two solvent-based coatings are omitted, the discharge of VOC in the whole repair process can be further greatly reduced, the environment is protected, the health of constructors is facilitated, and the whole social benefit is greatly improved.

The specific implementation mode is as follows:

the technical solution of the present invention is clearly and completely described below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.