A variety of adhesives are used in stone processing and construction. Adhesives have become an important part of stone processing. Without a plasticizer, many gorgeous, radiant stones will lose their fascinating and glamorous light. Although the Chinese market has high-quality, excellent performance of various brands of adhesives, but because the operators in use from the pursuit of high-efficiency production principles, did not follow the adhesive specifications and procedures, resulting in processing The products that come out fail to meet the quality requirements and cause complaints and claims from customers, causing huge economic losses.
I have experienced a huge economic loss caused by a stone enterprise processing composite panels. When the first-class stone processing enterprise in China processed a batch of composite panels for Korean customers, due to the quality problems of the adhesives used, the processed composite panels appeared empty, resulting in thousands of square meters of composite panel customers. Rejected, it was claimed by the customer for several million yuan, and so far the company has piled up thousands of square meters of composite panels. Since then, the company that has been hit hard has never produced composite panels, and the composite panel production line has since been idle in the workshop.
It is not difficult to see from this case that if there is a problem in the quality of the gel-repellent agent in the stone production and processing, or the wrong agent is selected in the processing of the product, or the operator does not follow the operation requirements, the specification is carefully operated and carefully constructed. It violates the rigorous and scientific use standards of adhesives and is free to operate and construct, which will bring huge economic losses to stone production enterprises.
Therefore, how to choose and use the adhesive has to be highly valued by the stone production enterprises. Stone production enterprises should choose the correct choice of adhesives, the correct use of the adhesive agent as an important processing technology, with the most suitable plastic turning agent (low price, excellent performance, simple construction), the best open-loop process to produce High quality stone products.
1.1 unsaturated resin glue
The amount of unsaturated resin used in stone processing is very large, especially in the processing of artificial stone, which is the main consumption material for artificial stone production.
Unsaturated resin glue refers to a polyacetate polymer with unsaturated bonds in the molecular chain, which is the main material for the reinforcement of stone slabs and the processing of artificial stone. The unsaturated dibasic acid, the saturated dibasic acid and the diol are subjected to polycondensation under certain conditions to form an unsaturated polyacetate, and the unsaturated polyacetate is dissolved in a certain amount of the crosslinking monomer to form a liquid resin, which is an unsaturated resin.
Unsaturated resin glues are artificial marble unsaturated resin glue, quartz stone unsaturated resin glue, marble unsaturated resin glue, handicraft unsaturated resin glue, coating resin glue, etc. depending on the application.
At present, the unsaturated polyacetate (resin) matrix used as a composite matrix at home and abroad is basically a phthalic acid type (referred to as o-benzene type), an isophthalic acid type (referred to as meta-benzene type), a bisphenol A type and ethylene. Based on vinegar type, halogenated unsaturated polyester resin.
1.1.1 Characteristics of unsaturated resin
It has good processing characteristics and can be solidified and formed at room temperature (not less than -20). The viscosity of the resin is suitable, and the product can be molded by various processing methods; the price is low.
1.1.2 Curing characteristics of unsaturated resin adhesive
The curing process of unsaturated polyester resin can be divided into three stages, namely:
(1) Gel stage (stage A): a stage in which fluidity is lost from the time when a curing agent or a promoter is added until the resin is condensed into a jelly state. In this segment, the resin can be melted and dissolved in certain solvents (such as ethanol, acetone, etc.). This phase takes about a few minutes to tens of minutes.
(2) Hardening stage (B stage): From the time of the resin gel, until it becomes a stage having a sufficient hardness to reach a substantially non-handy state. In this stage, the resin swells when it comes into contact with certain solvents (such as ethanol, acetone, etc.) but does not dissolve. It softens but does not melt completely when heated. This phase takes about tens of minutes to several hours.
(3) Maturing stage (C stage): It is placed at room temperature, and after the hardening, it reaches the hardness required for the product, and has stable physical and chemical properties for use. In this stage, the resin neither dissolves nor melts. The post-cure we usually refer to refers to this stage. This knot is usually a very long process. It usually takes days or weeks or even longer.
Unsaturated resin adhesive curing agent for stone: Resin resin: methyl ethyl ketone: drill = l00: 0.7: 0.7. This ratio will vary depending on the products of different manufacturers. Each manufacturer has its own technical parameters, which will be provided by the manufacturer at the time of purchase.
The application of unsaturated resin is mainly used for stone reinforcement, especially for back mesh reinforcement, artificial marble, quartz stone and artificial solid materials.
1.2 epoxy resin adhesive
Epoxy resin is a polymer which contains two or two epoxy groups, organic compounds such as aliphatic, alicyclic or aromatic, and which can form useful thermosetting products by epoxy groups. Epoxy oligomer. It has two forms of liquid, paid, and solid.
At present, there are several ways to classify the epoxy resin glue in the line: E!
(1) According to its main composition, it is divided into pure epoxy resin glue and modified epoxy resin glue.
(2) According to its professional use, it is divided into mechanical epoxy resin drill, construction epoxy resin adhesive, electronic eye epoxy glue, repair epoxy resin adhesive and traffic epoxy adhesive , epoxy adhesives for ships, etc.
(3) According to the conditions of L application, it is divided into room temperature curing type glue, low temperature curing type glue and other curing type glue.
(4) According to its packaging form, it can be divided into single-component type glue, two-component type glue and multi-component type glue.
(5) There are other sub-methods, such as solvent-free glue, fflj-type glue and water-based glue. However, at present, the performance and characteristics of more than 1.2.1 epoxy resin are applied by component classification:
1 good mechanical properties, strong cohesion;
2 excellent bonding properties, suitable for use as structural adhesive materials;
3 curing shrinkage rate is small. Generally 1% to 2%, foot thermosetting;
One of the varieties with the lowest cure shrinkage in the resin. In addition, the coefficient of linear expansion of the epoxy resin is also small, generally 6x10150C-1. Therefore, the epoxy resin product has small thermal change and is not easy to crack;
4 process processing performance is good, low pressure molding, contact molding;
5 electrical performance is good;
6 high heat resistance;
7 good stability;
It can be cured at low temperature, room temperature, medium temperature or high temperature; it can be cured on wet surface or even in water, it can be cured quickly and slowly, so it has stronger adaptability to construction process and manufacturing process; (9) Epoxy resin In addition to poor adhesion to non-polar plastics such as polyolefins, for various metal materials such as aluminum, steel, iron, copper; non-metallic materials such as glass, wood, concrete, etc.; and thermosetting plastics such as phenolic, amino, Unsaturated polyester has excellent bonding properties, so it is called universal adhesive. Epoxy adhesives are an important variety of structural adhesives.
Epoxy resin is relatively expensive in the three major resins, so it is subject to certain restrictions in the application. However, the use of epoxy resin for the processing of high-value products can guarantee the quality of the products. It is widely used in the permeability reinforcement of high-grade stone, especially the reinforcement of jade products has a very high cost performance. It can penetrate the crack into the crack with super strong penetration, which greatly enhances the cohesive force of the glue and the stone, and does not change the surface color of the jade. On the contrary, it can increase the texture and transparency of the jade and improve the jade product. Transparency.
The epoxy resin must be used together with the curing agent to solidify it and exert its superior mechanical properties. If there is no curing agent, the epoxy resin will always be liquid or private.
The ratio of epoxy resin to curing agent used in stone processing is usually 7:1 for face glue and 9:1 for net glue. However, the ratio of epoxy resin glues of different manufacturers is different. Each family has its own technical parameters, which will be provided by the manufacturer at the time of purchase.
Epoxy resin is widely used in the repair of stone slabs, especially high-grade jade stone, beige stone, crystal stone. Epoxy resin has high permeability, high adhesion and high strength. Although the price is higher than 1/3 of the unsaturated resin glue, it is still popular with most stone manufacturers.
1.3 Strongman Glue
Hercules glue, also known as marble glue, has a liquid, a blister body, and a solid strongener glue. Color glue, color paste, and toner can be used to make various colors.
Therefore, it is widely used in the surface of the stone product, especially on the stone with large cracks and need to be repaired. Hercules is a variety of unsaturated polyester glue, also known as marble glue.
The strong man glue is used for the stone production enterprises. The manufacturer will make the strong glue into various colors: yellow, beige, black, gray, white, colorless and transparent. Colorless and transparent glue mixed with human color powder, color paste, color paste can be adjusted into various colors of glue, used for marble crack board and travertine stone repair, which is a feature of strong rubber.
Marble glue is used for berthing, fracture joints, cracks on the board, hole repair or temporary fixing during installation, but it must not be used for long-term fixing of construction and installation.
Marble glue is a polymer composed of an unsaturated linear polyester resin and an unsaturated linear polyester resin formed by an unsaturated dibasic acid and a diol, and is an unsaturated polyester resin (UP). Its solidification speed is fast, but the weather resistance, anti-aging performance, waterproof and moisture resistance after curing and mechanical strength are much lower than dry hanging stone epoxy adhesive (AB glue, dry hanging glue). Therefore, it cannot be used in stone construction and installation.
Some marble adhesives may produce smudge-like water-stained contamination of the stone. Therefore, in large-scale use, it is necessary to test on a small sample to confirm that there is no hidden danger before use.
1.3.1 Advantages of Hercules
The curing time is short, and the curing time is less affected by temperature, can be quickly condensed, and has high production efficiency; can be combined with toner to adjust various colors, suitable for repairing and overlapping of various marbles; simple to use and convenient to operate. The ratio of curing agent is not strict; the price is low;
It is suitable for all kinds of construction occasions, but it can not be used for permanent installation. It can only be temporarily fixed and used with dry hanging glue.
1.3.2 Disadvantages of Hercules
The strength of the rubber is low, and it is difficult to be integrated with the body. After a long time, it is separated from the substrate by the private object;
After the glue is cured, the colloid is brittle and easily cracked. After being subjected to external force, it is very easy to crack; after the glue is cured, the colloid shrinkage rate is large. After the glue is dried, a small pit appears in the repaired place; the weather resistance is poor, and it cannot be used in an environment with large changes in humidity and heat.
1.4 dry hanging stone epoxy adhesive
Dry hanging stone epoxy adhesive, also known as AB glue or dry hanging glue, generally due to the bonding between stone and metal (dry hanging), is a modified epoxy resin polymer, weather resistance, anti-aging performance, waterproof after curing Strong resistance to moisture, impact toughness, tensile strength, and other logistics properties.
Some dry-hanging glue may cause oil-printed water-like pollution on the stone, which greatly affects the decorative effect of the stone. Therefore, when using dry hanging glue, you should first do an experiment to determine the quality of the dry hanging glue.
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