Room-temperature quick-drying epoxy adhesive (914 adhesive)

The agent is a mixed epoxy resin formulated with 600# epoxy resin and E20 epoxy resin (601 epoxy resin). It is prepared by using denatured amine as curing agent and ternary aromatic tertiary amine as curing agent. An adhesive that cures quickly at room temperature has no disadvantage of the 911 fast-drying adhesive being too sensitive to moisture.
(a) Features and Uses It can be rapidly solidified at room temperature, and can be completely cured in 17 to 20°C within 2.5 hours;
2. Adhesion strength is higher than that of ordinary room-temperature curing epoxy resin adhesives. When aluminum-aluminum bonding, it is cured at 20°C for 25 hours, shear strength is 20 MPa (200 kgf/cm2), and stainless steel is 30 MPa (300 MPa). Kilogram force / square centimeter) above. The epoxy resin adhesive cured with aliphatic amines or low molecular polyamides has a shear strength of only 3.0 to 4.0 MPa (30 to 40 kgf/cm2) after curing at 60°C.
Mainly used for bonding of metal, ceramics, glass steel, glass, etc., especially for the quick repair of small items.
(b) Raw materials 1. Epoxy resin is a generic term for resins containing epoxy groups. It is mainly made of polycondensation of epichlorohydrin and polyphenols. Due to different raw materials, blending ratios, and methods of manufacture, there are many product varieties and grades. This product uses two types of epoxy resins with product grade No. 600 and uniform grade E20. No. 600 epoxy resin: scientific name of diglycidyl ether, a light yellow viscous liquid, viscosity of 0.45 ~ 0.7 Pa · sec, low viscosity, high activity, rapid reaction with amine curing agent at room temperature. Adding E20 epoxy resin can increase the viscosity of components and facilitate the operation, but more importantly, it can increase the strength and water resistance and heat resistance of the adhesive.
Manufacturer: Shanghai Resin Factory, Wuxi Resin Factory, Tianjin Resin Factory, etc.
E20 Epoxy Resin: A bisphenol A type epoxy resin, which is a light yellow to brownish yellow highly viscous liquid. It is preferable to add 80 parts by weight when the number 600 epoxy resin is 100 parts by weight. Too little, adhesive heat resistance, poor water resistance; too much, although the heat resistance can be improved, but the water resistance has a downward trend.
Manufacturers: Guangzhou Dongfeng Chemical Plant, Shanghai Resin Factory, Wuxi Resin Factory, Anhui Yixian Chemical Plant, Yueyang Chemical Plant, Changsha Resin Factory, Jinan Resin Factory, Baoding Chemical Industry Fourth Factory, and Tianjin Organic Chemicals Experimental Factory.
2. Polysulfide rubber Lp-3 is a low molecular polysulfide rubber, which is the toughening activity of epoxy resin adhesive. After the addition, not only can the toughness of the adhesive be improved, but also the adhesive strength and water resistance of the adhesive can be improved. Addition amount: when the epoxy resin component is 100 parts by weight, 20 parts by weight is preferred; less than 10% or no, the high temperature performance of the adhesive is good, but the room temperature shear strength is low, especially soaking After 48 hours, the shear strength decreases more; when it exceeds 20 parts by weight, the shear strength at 60°C decreases. Therefore, from the consideration of room temperature, 60 °C and shear strength after water immersion, the optimum addition amount is 20%.
Factory: Jiaozuo City Chemical Industry Plant.
3. Silver powder is commonly called aluminum silver powder. Reflected light and heat performance is good. For paints, inks, pigments, concrete air entrainers and so on. In the agent as a filler.
Manufacturer: Jinan Xiangyang Chemical Plant, Shenyang No. 3 Chemical Plant, Liaoning Gai County Coating Factory, Yingkou Metal Pigment Factory.
The 4.703 curing agent is the condensation reaction product of phenol, formaldehyde, and ethylenediamine. Because the main component of this curing agent is the triaryl aromatic amine, especially the presence of free phenol and phenolic hydroxyl group in its structure, which greatly enhances the active hydrogen activity of the amine group in the curing agent, so it and the bisphenol A type and Other types of epoxy resins have a fast reaction rate and a dense network structure. After the addition, the heat resistance of the adhesive can be improved. When used in combination with a curing accelerator, when the amount of the curing accelerator K-54 is 3% of the epoxy resin component, the amount is 36 to 42%.
The raw materials used to prepare 703 curing agent are:
(1) Phenol: The common name is carbolic acid. Colorless or white crystals, with a special odor, toxic and corrosive, turning pink in the air. It is slightly soluble in water at room temperature and miscible above 65 degrees Celsius. Soluble in ethanol, ether, chloroform, glycerol and so on.
Manufacturers: Shanghai Gaoqiao Chemical Plant, Changzhou Phosphatic Fertilizer Plant, Pingxiang Chemical Plant, Shaoyang Second Chemical Plant, Wuhan Chemical Raw Material Plant, Chongqing Organic Chemical Plant, Beijing Yanshan Petrochemical Company Xiangyang Chemical Plant.
(2) Ethylenediamine: colorless alkaline liquid. Ammonia smell, flammable. Soluble in water and ethanol, slightly soluble in ether, insoluble in benzene. Easy to absorb carbon dioxide in the air.
Manufacturer: Guangxi Yishan County Rural Plant, Shanghai Yinhua 14 Factory, Hangzhou No. 1 Pharmaceutical Factory, Nanjing Pharmaceutical Factory, Xiangtan Rural Factory, Changzhou Petrochemical Factory, Baoding Pesticide Factory.
(3) Formaldehyde: Commonly known as formalin and formaldehyde. Gas at room temperature, soluble in water. 40% of the aqueous solution is called formaldehyde water. There is a strong irritating odor that stimulates people's eyes and nose. Soluble in water and ethanol. Industrial formaldehyde, the general formaldehyde content of 37%.
Manufacturers: Shanghai Solvent Factory, Xiamen Second Chemical Plant, Sichuan Changshou Vinylon Plant, Urumqi Chemical Plant, Jinan Organic Chemical Plant, and Jilin Chemical Industry Company Fertilizer Plant. 5. Curing Accelerator K-54 is an aromatic tertiary amine made from the condensation reaction of phenol, formaldehyde and dimethylamine. For 703 curing agent and epoxy resin curing reaction has a certain role to promote, but also can improve the heat resistance of the adhesive.
Without K-54 in the adhesive, the curing speed is slow, adding 1%, the curing speed is significantly improved. When the addition amount exceeds 4% or even higher, the curing speed does not increase significantly, and the shear strength does not increase significantly. However, after 24 hours of immersion, the shear strength decreases significantly with the increase of K-54. Therefore, the addition amount is preferably epoxy resin component: K-54 = 100:3 (by weight).
Manufacturer: Shanghai Reagent Factory Third Branch Factory (III) Preparation Method 1,703 Curing Agent (1) Formula: See 33-1
Raw material molecular weight ratio (molar ratio)
Phenol 94.11 Reagent 1.0
Ethylenediamine 60.10 Reagent 3.2
Formaldehyde 30.8 38%, Industry 3.0
(2) Operation: Use a 1000 ml jar and set it in a water bath.
1 Add molten phenol by heating and stir.
2 Slowly add ethylenediamine under cooling and control the temperature not to exceed 60 degrees Celsius.
3 Because the reaction is an exothermic reaction, pay attention to control the bath temperature to 35±2°C and add formaldehyde solution at a rate of about 5 g/min.
After 4 drops were added, the reaction was continued at 35±2°C for 1 hour.
5 Heat up and react at 98 to 100°C for 1 to 2 hours.
After the completion of the reaction, the pressure was reduced and the water and unreacted raw materials were distilled off. The end point is controlled by the refractive index of the product.
(3) Specifications Appearance brown red viscous liquid Refractive index (n D 攭攩 25 stir) 1.5630 ~ 1.5660
2, the preparation of adhesive The adhesive is divided into two groups A, B.
(1) A component - preparation of resin composition 1 recipe:
Epoxy Resin Adhesive A-Component Formulation Parts by Weight Raw Material Specification Epoxy Resin 600 55.6 ─ ┐
Epoxy E20(601) 44.4-â”´-100
Polysulfide rubber LP-3 20
M=800 to 1000
Silver Industry 10
2 Operation: Add the No. 600 epoxy resin and the crushed E20 epoxy resin to the reactor equipped with a stirrer, a thermometer and a reflux condenser according to the ratio and heat the mixture to 85±5°C with stirring to make the current epoxy resin. The resin dissolves into a uniform liquid and is poured into a container after cooling. Polysulfide rubber and silver powder are added according to the ratio, and the mixture is evenly obtained.
(2) B component - preparation of curing agent: mixing with curing agent 703 and curing accelerator in a mixing ratio of 36:3 (by weight).
(3) Preparation of adhesive: Before use, the two components of adhesives A and B are mixed at a weight ratio of 3 to 3.3:1.
(4) Bonding process 1. Surface treatment After the surface to be bonded is sanded with sandpaper, it is cleaned with acetone.
2. Bonding: Put the two components A and B of the adhesive into the container at a weight ratio of 3 to 3.3:1 and mix thoroughly. Apply the adhesive to the adhered surface with a glass rod and apply to the adhered surface. Contact pressure, cure at room temperature.
3, matters needing attention: The adhesive reaction activity, short pot life. For example, 5 grams of epoxy resin adhesive, at 17 to 20 degrees, the pot life of only about 10 minutes. Therefore, it is required to use it immediately after use, and the bonding operation is quick and agile.
(5) Adhesive Adhesion Properties Adhesion of room-temperature fast-drying adhesives Adhesives Testing temperature Curing conditions Shear strength °C MPa Al-aluminum 20°C, 2.5 hours 20 20.0~23.0
Aluminum-aluminum 20°C, 24 hours 20 20.0~24.0
Aluminum-aluminum 20°C, 7 days 20 20.0~24.0
Aluminum-aluminum 20°C, 160°C 20 20.0~24.0
Aluminum - Aluminum - 24 hours + 4 hours 20 20.0 - 24.0
Aluminum-aluminum 20°C, 24 hours 60 7.5~9.0
Aluminum - Aluminum 20°C, 7 days, 60 8.5~10.0
Aluminium-aluminum 20°C for 24 hours and water immersed in room temperature for 24 hours 20 18.0~20.0 Aluminum-aluminum 20°C for 24 hours and water immersed at room temperature for 7 days 20 18.0~20.0
Aluminum-aluminum 20°C 48 hours +100～-60°C 20 20.0~24.0
Hot and cold impact 3 times Brass - Brass 20 °C, 24 hours 20 15.0 ~ 18.0 Stainless steel - Stainless steel 20 °C, 24 hours 20 30.0 ~ 33.0 Copper - Copper 20 °C, 24 hours 20 11.0 ~ 13.0 Epoxy glass steel - ring 20 °C , 24 hours 20 14.0