阅读说明：本技术 一种轻负荷乙二醇型冷却液用全有机型添加剂配方 (All-organic additive formula for light-load glycol type cooling liquid ) 是由 邱萍 沈鹏 陈林 于 2020-11-30 设计创作，主要内容包括：本发明公开了一种轻负荷乙二醇型冷却液用全有机型添加剂配方。按质量份数计,包括以下组分：缓冲剂280～670份,铜特效缓蚀剂50～100份,铝特效缓蚀剂20～60份,pH调节剂100～170份,消泡剂2～10份,抗菌剂6～10份；其中：缓冲剂为至少两种有机酸及其碱金属盐的混合物,有机酸为一元羧酸或二元羧酸；铝特效缓蚀剂为有机胺碱类化合物；抗菌剂为苯甲酸钠；消泡剂为Si-C型聚醚改性聚硅氧烷类化合物。配方协同作用显著,配置乙二醇型冷却液时对轻负荷发动机冷却系统有突出的防腐蚀效果,能长效防止铝泵气穴腐蚀,铸铝机件点蚀,且储备碱度高,在较宽pH波动范围内保持体系稳定,添加剂不易析出,水泵密封耐久可靠。(The invention discloses a formula of an all-organic additive for a light-load glycol cooling liquid. The coating comprises the following components in parts by mass: 280-670 parts of a buffering agent, 50-100 parts of a copper specific corrosion inhibitor, 20-60 parts of an aluminum specific corrosion inhibitor, 100-170 parts of a pH regulator, 2-10 parts of a defoaming agent and 6-10 parts of an antibacterial agent; wherein: the buffer is a mixture of at least two organic acids and alkali metal salts thereof, and the organic acid is a monocarboxylic acid or a dicarboxylic acid; the aluminum specific corrosion inhibitor is an organic amine alkali compound; the antibacterial agent is sodium benzoate; the defoaming agent is Si-C type polyether modified polysiloxane compound. The formula has obvious synergistic effect, has outstanding anti-corrosion effect on a cooling system of a light-load engine when the ethylene glycol type cooling liquid is prepared, can prevent cavitation corrosion of an aluminum pump and pitting corrosion of a cast aluminum machine part for a long time, has high reserve alkalinity, keeps the system stable in a wider pH fluctuation range, is difficult to separate out an additive, and is durable and reliable in water pump sealing.)

1. The all-organic additive formula for the light-load glycol cooling liquid is characterized by comprising the following components in parts by weight: 280-670 parts of a buffering agent, 50-100 parts of a copper specific corrosion inhibitor, 20-60 parts of an aluminum specific corrosion inhibitor, 2-10 parts of a defoaming agent and 6-10 parts of an antibacterial agent; wherein:

the buffer is a conjugated acid-base system formed by at least two organic acids and alkali metal salts thereof, and the organic acids are monocarboxylic acid or dicarboxylic acid; the aluminum specific corrosion inhibitor is an organic amine alkali compound; the antibacterial agent is sodium benzoate; the defoaming agent is a Si-C type polyether modified polysiloxane compound.

2. The additive formulation of claim 1, wherein the buffering agent is obtained by mixing an organic acid with an alkaline pH adjusting agent, wherein the organic acid is 180 to 500 parts by weight and the alkaline pH adjusting agent is 100 to 170 parts by weight.

3. The additive formulation according to claim 1, wherein the Si-C type polyether modified polysiloxane compound is one or a mixture of two of polyether modified heptamethyltrisiloxane or polyether modified octamethyltetrasiloxane.

4. The additive formulation of claim 1, wherein the monobasic acid is valeric acid, caproic acid, enanthic acid, caprylic acid, capric acid, cinnamic acid, hydroxybenzoic acid, or benzoic acid; the dicarboxylic acid is succinic acid, adipic acid, sebacic acid or oxalic acid.

5. The additive formulation of claim 1, wherein the organic amine base compound is a mixture of one or more of ethanolamine, aniline, and long chain quaternary ammonium salts.

6. The additive formulation of claim 1, wherein the copper specific corrosion inhibitor is one or a mixture of methyl benzotriazole and benzotriazole.

7. The additive formulation of claim 1 wherein said alkaline pH adjusting agent is sodium hydroxide.

Technical Field

The invention belongs to the technical field of glycol-type cooling liquid, and particularly relates to a full organic additive formula for light-load glycol-type cooling liquid.

Background

The ethylene glycol type cooling liquid mainly comprises deionized water, ethylene glycol, an additive and dye, and is applied to cooling systems of automobile engines, motors, air conditioners and the like. The two functions of corrosion prevention and scale prevention of the cooling liquid are mainly determined by the formula of the additive. The types of the additive can be divided into an inorganic type, an organic type and an organic-inorganic composite type according to the types of the corrosion inhibitor.

The inorganic corrosion inhibitor has high consumption speed, and the application range is limited because the compounds such as nitrite, phosphate, borate, silicate and the like contained in the inorganic corrosion inhibitor are harmful to the environment and human bodies. The organic corrosion inhibitor is mainly characterized in that compounds containing unpaired electron pairs or polar groups are adsorbed on the surface of metal to form a hydrophobic film, so that charge transfer and corrosive agent transfer are inhibited, and metal corrosion is reduced. The organic corrosion inhibitor has low consumption speed, meets the requirements of global specifications on chemical components of the cooling liquid, and becomes the development trend of the cooling liquid products in the current market. However, when the automobile runs, due to the bouncing and the vibration of the automobile body, air permeates into the anti-freezing liquid, so that foam is generated, compared with an inorganic formula, the all-organic formula is easier to generate bubbles due to the characteristics of compounds of the all-organic formula, and the risks of cavitation corrosion and pitting corrosion of cast aluminum parts are increased. In addition, in the process of using the glycol-type cooling liquid, glycol may be oxidized and deteriorated into glyoxal and oxalic acid at high temperature, and these acidic substances have strong corrosion action on metal parts of the cooling system. Therefore, the antifreeze additive formula needs to have certain buffering capacity to eliminate the part H⁺And controlling the pH value of the cooling liquid to be in a neutral or alkalescent range. Compared with inorganic acid and salts thereof, the organic additive formula has lower reserve alkalinity and slightly poorer buffering capacity. In addition, a part of organic additive formula is easy to separate out in use and storage, and gel-like precipitates are generated, so that the sealing reliability of the water pump water seal is influenced.

Disclosure of Invention

The invention aims to provide a full organic additive formula for a light-load glycol type cooling liquid, which has an outstanding anti-corrosion effect on various metal parts of a cooling system of a light-load engine when the glycol type cooling liquid is prepared by using the formula, can prevent cavitation corrosion of an aluminum pump and pitting corrosion of cast aluminum parts for a long time, has higher reserve alkalinity, can keep a system stable in a wider pH value fluctuation range, is difficult to precipitate an additive, and can keep a water pump to be sealed, durable and reliable.

In order to solve the technical problems, the invention provides the following technical scheme:

the formula of the all-organic additive for the light-load glycol cooling liquid comprises the following components in parts by weight: 280-670 parts of a buffering agent, 50-100 parts of a copper specific corrosion inhibitor, 20-60 parts of an aluminum specific corrosion inhibitor, 2-10 parts of a defoaming agent and 6-10 parts of an antibacterial agent; wherein:

the buffer is a conjugated acid-base system formed by at least two organic acids and alkali metal salts thereof, and the organic acids are monocarboxylic acid or dicarboxylic acid; the aluminum specific corrosion inhibitor is an organic amine alkali compound; the antibacterial agent is sodium benzoate; the defoaming agent is a Si-C type polyether modified polysiloxane compound.

In the scheme, the buffering agent is prepared by compounding at least two organic acids and alkali metal salts thereof, so that the buffering agent not only has good buffering capacity, but also has a certain corrosion inhibition effect. The aluminum specific corrosion inhibitor is an organic amine alkali compound, N atoms in the compound not only have an obvious inhibiting effect on corrosion of metal aluminum in a cooling system, but also have a certain buffering capacity, and the reserve alkalinity of the additive formula can be obviously improved after a small amount of the compound is used. The antibacterial agent is a sodium benzoate compound, and the compound also has certain buffering capacity. The defoaming agent is a polyether modified polysiloxane compound, has good defoaming, foam inhibition and high-temperature shear resistance, has strong defoaming function, and can inhibit the growth of foam for a long time, and the cavitation corrosion resistance of the aluminum pump and the pitting corrosion resistance of the aluminum casting machine part can be obviously improved by adding a small amount of the defoaming agent.

According to the scheme, the buffering agent is obtained by mixing 180-500 parts of mixed organic acid and 100-170 parts of alkaline pH regulator.

According to the scheme, the Si-C type polyether modified polysiloxane compound is one or a mixture of polyether modified heptamethyltrisiloxane or polyether modified octamethyltetrasiloxane.

According to the scheme, the monoacid is valeric acid, caproic acid, heptanoic acid, caprylic acid, capric acid, cinnamic acid, hydroxybenzoic acid or benzoic acid; the dicarboxylic acid is succinic acid, adipic acid, sebacic acid or oxalic acid.

According to the scheme, the organic amine alkali compound is one or a mixture of more of ethanolamine, aniline and long-chain quaternary ammonium salt.

According to the scheme, the copper specific corrosion inhibitor is one or a mixture of two of methylbenzotriazole (TTA) and Benzotriazole (BTA).

According to the scheme, the alkaline pH regulator is sodium hydroxide.

The invention has the beneficial effects that:

1. according to the all-organic additive formula for the light-load glycol-type cooling liquid, components such as the buffering agent, the aluminum-copper specific corrosion inhibitor, the antibacterial agent and the like in the formula are all multifunctional products, so that the all-organic additive formula not only plays a role of the all-organic additive formula, but also has other effects, and has an obvious synergistic effect; the sodium benzoate is alkali metal salt of benzoic acid, and can be compounded with a buffering agent to enhance the buffering capacity of the buffering agent and improve the reserve alkalinity of the sustained-release agent; meanwhile, the buffering agent is compounded with the aluminum and copper specific corrosion inhibitor, so that the corrosion inhibition film on the surface of the aluminum and copper is not damaged, and the corrosion resistance of metals such as soldering tin, cast iron, steel and the like can be improved; in addition, the Si-C type polyether modified polysiloxane defoaming agent is adopted in the formula, so that the defoaming agent has good defoaming, foam inhibiting and high-temperature shear resistance, and the cavitation corrosion resistance of the aluminum pump and the pitting corrosion resistance of the aluminum casting machine part can be obviously improved by adding a small amount of the defoaming agent.

2. The formula system is stable, the reserve alkalinity of the formula is higher, the light-load glycol type cooling liquid with any proportion is prepared, all components of the additive are well dissolved in the glycol type cooling liquid and are not easy to precipitate, the additive has excellent anti-corrosion effect on all metal parts of a cooling system of a light-load engine, and the water pump has excellent sealing durability and reliability performance and long-acting property.

Detailed Description

The invention will now be further illustrated with reference to specific examples.

Examples 1 to 4 of the present invention provide a formulation of an all-organic additive for a light-duty glycol-type coolant, and the specific formulation is shown in table 1.

Table 1 examples 1-4 formulations (in parts by mass)

The 'reserve alkalinity' is the ability to maintain the pH of the system stable as the pH of the system fluctuates. Because of the various types of metal materials of the cooling system, the corrosion can be caused by the higher pH value and the lower pH value, and various secondary problems can be caused by the corrosion. Through detection, the reserve alkalinity values of all organic additive formulas for the light-load glycol-type cooling liquid prepared in the above examples 1 to 4 are all above 5, which indicates that the additive formulas have strong capability of keeping the pH of the system stable.

The additive formulation obtained in example 2 above was used to prepare a light duty glycol-based coolant, wherein the ratio of ethylene glycol to deionized water was 1:1 (volume ratio), and the additive formulation proportion accounted for about 3% of the coolant. The corrosion prevention effect of the cooling liquid on each metal part of the cooling system was examined by simulation using a corrosion test, and the results are shown in table 2. The cavitation corrosion resistance of the cooling liquid and the pitting corrosion resistance of the cast aluminum machine part are examined through simulation verification of the cast aluminum rotary hot corrosion and the aluminum pump cavitation corrosion, and the test results are respectively shown in table 3.

Table 2 example 2 coolant simulated use corrosion validation of additive formulation configuration

From the above table 2, it can be seen that the glycol-based coolant prepared by using the additive formulation of example 2 meets the standard requirements through simulated use corrosion verification, and the mass change of various metal test pieces is far below the standard limit, which indicates that the formulation has a long-acting anti-corrosion effect on various metal material components of a cooling system of a light-load engine.

TABLE 3 verification of the resistance of the coolant to hot corrosion in cast aluminum and cavitation corrosion in aluminum pumps prepared with the additive formulation of example 2

As can be seen from Table 3, the glycol-type coolant prepared by the additive formulation of example 2 meets the standard requirements through the verification of aluminum casting heat transfer corrosion and aluminum pump cavitation corrosion, and the long-term durability of the coolant is verified by supplementing 1000h of aluminum casting heat transfer corrosion.

The stability of the formula of the embodiment 2 of the invention when used for the glycol type cooling liquid is verified by the durability of the water pump for 1000 hours, and the result shows that the water pump is flexible to rotate, free of clamping stagnation and loose after running for 1000 hours; the water leakage holes have no leakage; parts such as a pump body, a bearing impeller, a water seal and the like are normal; the assembly size and the sealing performance of the water pump are qualified.

In conclusion, the additive formula disclosed by the embodiment of the invention has higher reserve alkalinity, has excellent anti-corrosion effect on all metal parts of a cooling system of a light-load engine when being used for the glycol type cooling liquid, and verifies the stability and the long-acting property of the formula through the durability of the water pump.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.