阅读说明：本技术 一种改性精密铸造硅溶胶的有机加强剂 (Organic reinforcing agent for modifying precision casting silica sol ) 是由 李彦平 韩子木 于 2020-07-16 设计创作，主要内容包括：本发明公开了一种改性精密铸造硅溶胶的有机加强剂,所述有机加强剂包括以下重量份的各原料：丙烯酸类乳液0-40份、丁二烯类胶乳20-80份、水性聚氨酯类乳液0-40份、VAE类乳液0-60份。本发明在提高干燥效率和湿强度和的同时,也降低了残留强度,使硅溶胶膜容易清理；并与硅溶胶具有良好的兼容性和稳定性,能使铸件的成品率提高,返修率降低。(The invention discloses an organic reinforcing agent for modified precision casting silica sol, which comprises the following raw materials in parts by weight: 0-40 parts of acrylic emulsion, 20-80 parts of butadiene latex, 0-40 parts of waterborne polyurethane emulsion and 0-60 parts of VAE emulsion. The invention improves the drying efficiency and the wet strength, and simultaneously reduces the residual strength, so that the silicon sol film is easy to clean; and the silicon sol has good compatibility and stability, so that the yield of the casting is improved, and the repair rate is reduced.)

1. An organic reinforcing agent for modifying precision casting silica sol, which is characterized by comprising: the method is characterized in that: the organic reinforcing agent comprises the following raw materials in parts by weight: 0-40 parts of acrylic emulsion, 20-80 parts of butadiene latex, 0-40 parts of waterborne polyurethane emulsion and 0-60 parts of VAE emulsion.

2. The organic booster according to claim 1, wherein: other additives are also included, including wetting agents, defoamers, biocides, leveling agents, and pH adjusters.

3. An organic enhancer according to claim 2, characterized in that: the weight portion of the other additives is 0.2-5 portions.

4. An organic enhancer according to claim 3, characterized in that: the acrylic emulsion is any one anionic latex of pure acrylic emulsion, styrene-acrylic emulsion or silicone-acrylic emulsion; the butadiene latex is any one or two anionic latexes of butadiene-pyridine latex, butadiene-styrene latex, chloroprene latex or butyronitrile latex; the waterborne polyurethane emulsion is single-component, anionic or nonionic polyurethane emulsion or modified polyurethane emulsion; the VAE emulsion is universal latex, waterproof latex or a composite of the universal latex and the waterproof latex.

5. An organic enhancer according to claim 3, characterized in that: the organic reinforcing agent comprises the following raw materials in parts by weight: 29 parts of pure acrylic latex, 50 parts of butadiene-pyridine latex, 20 parts of waterborne polyurethane emulsion, 0.2 part of defoaming agent, 0.7 part of flatting agent and 0.1 part of bactericide.

6. An organic enhancer according to claim 3, characterized in that: the organic reinforcing agent comprises the following raw materials in parts by weight: 29.5 parts of pure styrene-acrylic latex, 70 parts of styrene-butadiene latex, 0.2 part of wetting agent, 0.2 part of defoaming agent and 0.1 part of bactericide.

7. An organic enhancer according to claim 3, characterized in that: the organic reinforcing agent comprises the following raw materials in parts by weight: 19 parts of pure styrene-acrylic latex, 30 parts of butyronitrile latex, 50 parts of styrene-butadiene latex, 0.2 part of wetting agent, 0.2 part of defoaming agent, 0.5 part of flatting agent and 0.1 part of bactericide.

8. An organic enhancer according to claim 3, characterized in that: the organic reinforcing agent comprises the following raw materials in parts by weight: 39.7 parts of silicone-acrylate latex, 60 parts of neoprene latex, 0.2 part of defoaming agent and 0.1 part of bactericide.

9. An organic enhancer according to claim 3, characterized in that: the organic reinforcing agent comprises the following raw materials in parts by weight: 19.7 parts of pure acrylic latex, 30 parts of butadiene styrene latex, 50 parts of universal VAE emulsion, 0.2 part of defoaming agent, 0.1 part of bactericide and 0.5 part of pH regulator.

Technical Field

The invention relates to the field of modified precision casting silica sol, in particular to an organic reinforcing agent for modified precision casting silica sol.

Background

The precision casting has a very long history, the silica sol precision casting is novel precision casting which is developed along with the high precision requirement of airplane parts in the second war period, and the silica sol serving as a pure inorganic reinforcing agent has the characteristics of environmental protection, low cost and high-temperature strength, but also has the defects of slow drying, low wet strength, brittle and inelastic film and overlong production period. With the development of the petroleum industry, various organic reinforcing agents have been extensively developed. The organic reinforcing agent has the characteristics of high wet strength, good membrane toughness and quick drying, and the modified silica sol with perfect performance can be obtained by modifying the silica sol with a proper organic reinforcing agent. The silica sol for precision casting is an alkaline negatively charged SiO2 aqueous colloid with a particle size of 8-20nm, so that an organic reinforcing agent is generally required to be an aqueous organic substance, and the chemical stability and the fluidity of the silica sol colloid cannot be influenced. However, PVA, PVP and amides are mostly selected as the organic matters for modifying the silica sol at home, and the addition amount of the organic matters is only 0.01-1 percent, which is not enough to better improve the drying speed and the wet strength of the silica sol; the addition amount is large, so that the viscosity of the silica sol is increased too much, the fluidity of the silica sol is influenced, and meanwhile, the silica sol is easy to be accelerated to lose efficacy and has poor compatibility with the silica sol.

Disclosure of Invention

In order to solve the problems, the invention provides an organic reinforcing agent for modifying precision casting silica sol, which is well compatible with the silica sol and can improve the drying speed, the wet strength and the residual strength of a silica sol adhesive film.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

an organic reinforcing agent for modifying precision casting silica sol comprises the following raw materials in parts by weight: 0-40 parts of acrylic emulsion, 20-80 parts of butadiene latex, 0-40 parts of waterborne polyurethane emulsion and 0-60 parts of VAE emulsion.

Optionally, other additives are included, including wetting agents, defoamers, biocides, leveling agents, and pH adjusters.

Optionally, the other additives are 0.2-5 parts by weight.

Optionally, the acrylic emulsion is any one anionic latex of pure acrylic emulsion, styrene-acrylic emulsion or silicone-acrylic emulsion; the butadiene latex is any one or two anionic latexes of butadiene-pyridine latex, butadiene-styrene latex, chloroprene latex or butyronitrile latex; the waterborne polyurethane emulsion is single-component, anionic or nonionic polyurethane emulsion or modified polyurethane emulsion; the VAE emulsion is universal latex or waterproof latex, and is also a compound of the universal latex and the waterproof latex.

Optionally, the organic reinforcing agent comprises the following raw materials in parts by weight: 29 parts of pure acrylic latex, 50 parts of butadiene-pyridine latex, 20 parts of waterborne polyurethane emulsion, 0.2 part of defoaming agent, 0.7 part of flatting agent and 0.1 part of bactericide.

Optionally, the organic reinforcing agent comprises the following raw materials in parts by weight: 29.5 parts of pure styrene-acrylic latex, 70 parts of styrene-butadiene latex, 0.2 part of wetting agent, 0.2 part of defoaming agent and 0.1 part of bactericide.

Optionally, the organic reinforcing agent comprises the following raw materials in parts by weight: 19 parts of pure styrene-acrylic latex, 30 parts of butyronitrile latex, 50 parts of styrene-butadiene latex, 0.2 part of wetting agent, 0.2 part of defoaming agent, 0.5 part of flatting agent and 0.1 part of bactericide.

Optionally, the organic reinforcing agent comprises the following raw materials in parts by weight: 39.7 parts of silicone-acrylate latex, 60 parts of neoprene latex, 0.2 part of defoaming agent and 0.1 part of bactericide.

Optionally, the organic reinforcing agent comprises the following raw materials in parts by weight: 19.7 parts of pure acrylic latex, 30 parts of butadiene styrene latex, 50 parts of universal VAE emulsion, 0.2 part of defoaming agent, 0.1 part of bactericide and 0.5 part of pH regulator.

Compared with the prior art, the invention has the technical progress that:

the organic reinforcing agent is added into the silica sol, so that the drying time of the silica sol adhesive film is shortened to 2-4 hours from the original 8-12 hours, and the drying efficiency is improved by 2-3 times; the wet strength is increased to 3.72MPa from the original 1.72MPa by 116 percent, and the residual strength is reduced to 4.13MPa from the original 4.72MPa by 12.5 percent. The invention improves the drying efficiency and the wet strength, reduces the residual strength, has good compatibility and stability with the silica sol, improves the yield of the casting, reduces the repair rate, and has better fineness after dissolution than unmodified primary products (see attached figures 1 and 2).

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

In the drawings:

FIG. 1 is an image of a dried gel film of a conventional silica sol.

FIG. 2 is an image of a dried adhesive film obtained by adding 8% of the organic reinforcing agent of the present invention to a silica sol.

Detailed Description

The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present invention will be described below with reference to the accompanying drawings.

The invention discloses an organic reinforcing agent for modified precision casting silica sol, which comprises 0-40 parts of acrylic emulsion, 20-80 parts of butadiene latex, 0-40 parts of waterborne polyurethane emulsion, 0-60 parts of VAE emulsion, 0-0.2 part of wetting agent, 0-0.2 part of defoaming agent, 0-0.1 part of bactericide and 0.5-0.7 part of flatting agent. Other additives are also included, including wetting agents, defoamers, biocides, leveling agents, and pH adjusters. The weight portion of other additives is 0.2-5 portions. Wherein the acrylic emulsion is any one anionic latex of pure acrylic emulsion, styrene-acrylic emulsion or silicone-acrylic emulsion; the butadiene latex is any one or two anionic latexes of butadiene-pyridine latex, butadiene-styrene latex, chloroprene latex or butyronitrile latex; the aqueous polyurethane emulsion is single-component, anionic or nonionic polyurethane emulsion or modified polyurethane emulsion; the VAE emulsion is general purpose latex or waterproof latex, and can also be a compound of the general purpose latex and the waterproof latex.