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Resin coating crosslinking agent
2017-8-4 11:14:12
Resin coating crosslinking agent
The crosslinking process of adding resin coating crosslinking agent can be divided into three stages:
1. Gelation stage (phase A) : from the addition of crosslinking agent and promoter, until the resin coagulates into gelatinous and loses its fluidity. In this section, the resin can melt and be soluble in some solvents (e.g., ethanol, acetone, etc.). This stage takes about a few minutes to dozens of minutes.
2. Hardening stage (phase B) : after the resin gel is calculated, until it is hardened enough to achieve the basic non-sticky hand state. In this stage, the resin can be dissolved in contact with certain solvents (such as ethanol, acetone, etc.) but cannot be dissolved, and can be softened but not completely melted when heated. This stage takes about a few minutes to a few hours.
3. The maturation stage (C stage) : it is placed at room temperature and after hardening, the product requires hardness and has stable physical and chemical properties. In this stage, the resin is neither dissolved nor fused. We usually refer to late crosslinking as this stage. This junction is usually a long process. It usually takes days or weeks or even longer.
The most commonly used resin crosslinking agent in China is 5 # crosslinking agent.
The type of accelerator commonly used in cold crosslinking system. Strictly speaking, promoters can be divided into three categories:
1. Hydroperoxides such as cyclohexanone and ethyl ketone peroxide are effective, such as cobalt naphthenate and cobalt, etc. The former is commonly used abroad.
2. The peroxide of peroxide such as benzoyl BPO is effective, such as a tertiary amine, dimethyl aniline, diethyl aniline, etc.
3. Effective for both, such as dodecyl mercaptan.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The crosslinking process of adding resin coating crosslinking agent can be divided into three stages:
1. Gelation stage (phase A) : from the addition of crosslinking agent and promoter, until the resin coagulates into gelatinous and loses its fluidity. In this section, the resin can melt and be soluble in some solvents (e.g., ethanol, acetone, etc.). This stage takes about a few minutes to dozens of minutes.
2. Hardening stage (phase B) : after the resin gel is calculated, until it is hardened enough to achieve the basic non-sticky hand state. In this stage, the resin can be dissolved in contact with certain solvents (such as ethanol, acetone, etc.) but cannot be dissolved, and can be softened but not completely melted when heated. This stage takes about a few minutes to a few hours.
3. The maturation stage (C stage) : it is placed at room temperature and after hardening, the product requires hardness and has stable physical and chemical properties. In this stage, the resin is neither dissolved nor fused. We usually refer to late crosslinking as this stage. This junction is usually a long process. It usually takes days or weeks or even longer.
The most commonly used resin crosslinking agent in China is 5 # crosslinking agent.
The type of accelerator commonly used in cold crosslinking system. Strictly speaking, promoters can be divided into three categories:
1. Hydroperoxides such as cyclohexanone and ethyl ketone peroxide are effective, such as cobalt naphthenate and cobalt, etc. The former is commonly used abroad.
2. The peroxide of peroxide such as benzoyl BPO is effective, such as a tertiary amine, dimethyl aniline, diethyl aniline, etc.
3. Effective for both, such as dodecyl mercaptan.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine Uses:
The product is identical to Ethancure 100 and Lonza DETDA 80, DETDA is very effective polyurethane elastomer chain extender; also be used as polyurethane and epoxy resin curing agent, epoxy resin of an antioxidant, industrial oils and lubricants . In addition, also as intermediates in organic synthesis.Especially for the RIM (reaction injection molding), is important in the field of spray polyurea chain extender species. Also can be used for casting polyurethane elastomer (CPU) and a curing agent, epoxy curing agent, epoxy resin of antioxidants, lubricants and industrial oils other antioxidants.
The actual use is the first two, the latter does not mean much.
The commonly used stimulant for market sale
1. Cobalt naphthenate, usually 1% of styrene solution, is called 1. It is used in conjunction with 1 # crosslinking agent for cyclohexanone. For decades, it has been thought that cobalt salt conformable agent has good performance and is widely used in unsaturated polyester resin at room temperature. Due to the influence of cobalt salt color, it has been widely recognized in recent years that its gel crosslinking effect and color cannot meet the needs.
2, N, N - dimethyl aniline, usually 10% styrene solution, is called a 2 # promoter. It is used in conjunction with 2 # crosslinking agent (benzoyl peroxide). In the case of resin containing a large amount of free phenol or the molecular structure of the polymer chain, it is an effective crosslinking system. (such as crosslinking of vinyl ester resins, bisphenol A polyester resins, chlorinated anhydride polyester resin, etc.)
3. Cobalt isocinic acid, commonly used in pre-promoted resin, especially with a strong isooctanic acid cobalt precatalyzed, can get better effect. Normally quantitative appraise the promoting effect is better than cobalt naphthenate, this is because the naphthenic acid is a molecular weight are not fixed (molecular weight range of 180-180) of naphthene carboxylic acid derivatives, so the cobalt content is difficult to be very accurate, and because it is a byproduct of oil refining, usually color is deeper, so the quantitative analysis on the market at present cobalt has a tendency to replace the cobalt naphthenate.
4, cobalt, potassium, calcium, transition metal compound with compound accelerator, (often referred to as # 5 promoter) using alkali metal salt, alkaline earth metal salts and can delay the transition metal salts used with cobalt salt, can achieve alone do promoter can not reach the effect of cobalt salt.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
The actual use is the first two, the latter does not mean much.
The commonly used stimulant for market sale
1. Cobalt naphthenate, usually 1% of styrene solution, is called 1. It is used in conjunction with 1 # crosslinking agent for cyclohexanone. For decades, it has been thought that cobalt salt conformable agent has good performance and is widely used in unsaturated polyester resin at room temperature. Due to the influence of cobalt salt color, it has been widely recognized in recent years that its gel crosslinking effect and color cannot meet the needs.
2, N, N - dimethyl aniline, usually 10% styrene solution, is called a 2 # promoter. It is used in conjunction with 2 # crosslinking agent (benzoyl peroxide). In the case of resin containing a large amount of free phenol or the molecular structure of the polymer chain, it is an effective crosslinking system. (such as crosslinking of vinyl ester resins, bisphenol A polyester resins, chlorinated anhydride polyester resin, etc.)
3. Cobalt isocinic acid, commonly used in pre-promoted resin, especially with a strong isooctanic acid cobalt precatalyzed, can get better effect. Normally quantitative appraise the promoting effect is better than cobalt naphthenate, this is because the naphthenic acid is a molecular weight are not fixed (molecular weight range of 180-180) of naphthene carboxylic acid derivatives, so the cobalt content is difficult to be very accurate, and because it is a byproduct of oil refining, usually color is deeper, so the quantitative analysis on the market at present cobalt has a tendency to replace the cobalt naphthenate.
4, cobalt, potassium, calcium, transition metal compound with compound accelerator, (often referred to as # 5 promoter) using alkali metal salt, alkaline earth metal salts and can delay the transition metal salts used with cobalt salt, can achieve alone do promoter can not reach the effect of cobalt salt.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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