CN109627483B - Preparation method of melamine rigid closed-cell foam - Google Patents
Preparation method of melamine rigid closed-cell foam Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
- C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
- C08J9/141—Hydrocarbons
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G12/00—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08G12/02—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes
- C08G12/26—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds
- C08G12/34—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic compounds and acyclic or carbocyclic compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/14—Saturated hydrocarbons, e.g. butane; Unspecified hydrocarbons
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2205/00—Foams characterised by their properties
- C08J2205/04—Foams characterised by their properties characterised by the foam pores
- C08J2205/052—Closed cells, i.e. more than 50% of the pores are closed
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2361/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
- C08J2361/20—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen
- C08J2361/30—Condensation polymers of aldehydes or ketones with only compounds containing hydrogen attached to nitrogen of aldehydes with heterocyclic and acyclic or carbocyclic compounds
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Abstract
The invention belongs to the technical field of high polymer foam materials, and particularly relates to a preparation method of melamine rigid closed-cell foam. The method comprises the following steps: firstly, pre-polymerizing melamine, paraformaldehyde, hydroxyethyl melamine and diamine to form foaming resin, and then adding a curing agent, a foaming agent, an auxiliary agent and the like to heat and prepare the melamine rigid closed-cell foam. The melamine formaldehyde hard closed-cell foam material prepared by the method has the advantages of high compression strength, strong weather resistance, high closed-cell rate, excellent flame retardant property and the like, and can be applied to air-conditioning air pipes, sandwich boards and external wall insulation material markets.
Description
Technical Field
The invention relates to the technical field of preparation of high polymer foam materials, in particular to a preparation method of melamine rigid closed-cell foam.
Background
The efficient utilization of energy has become a common topic of all mankind, and as various buildings of people's daily life and work are huge in quantity, huge energy waste is caused by heat dissipation of buildings every year, and the heat preservation and maintenance of buildings become a hotspot of research of people. However, in recent years, fire disasters frequently occur in the field of domestic and foreign buildings, particularly fire disasters of high-rise buildings cause great property loss and casualties, and one reason for the fire disasters is that the fire behavior is rapidly spread and expanded due to flammable external wall heat-insulating materials. Therefore, a series of documents and notices such as 46, 65, 350 and the like are issued by the ministry of public security, housing and urban and rural construction successively, the flame retardant property of the external wall heat insulation material is definitely specified, and the implementation of GB50016-2014 further strengthens the requirement of the flame retardant property of the heat insulation material. However, the inorganic external wall insulation material is limited by the properties of the external wall insulation material, and although the flame retardant properties of the common inorganic external wall insulation material, such as rock wool, glass fiber, foamed cement and the like, meet the national standards, the volume weight and the heat conductivity coefficient are both higher, and the requirements related to energy saving and heat insulation of newly-built houses are not met. The existing organic heat-insulating materials such as EPS, XPS, polyurethane and the like have low heat conductivity coefficient but are flammable materials, and release a large amount of toxic smoke in the combustion process, so that secondary damage can be caused to personnel when a fire disaster happens. Although their flame-retardant ability is improved after the addition of the flame retardant, the flame retardant is gradually lost with the passage of time, resulting in a significant decrease in the flame-retardant performance. Therefore, the market needs an external wall thermal insulation material which has excellent flame retardance and thermal insulation performance, proper price and physical performance meeting the requirements.
Melamine is often added to various materials for improving the flame retardant ability of products due to its excellent flame retardant properties, and melamine formaldehyde resin foams prepared from melamine and formaldehyde inherit this advantage and exhibit excellent flame retardant properties without adding any flame retardant. However, due to the defects of the melamine formaldehyde resin foam and the problems which are not solved in the technology, researchers put more energy into the research and development of the melamine formaldehyde resin open-cell foam for a long time, and apply the melamine formaldehyde resin open-cell foam to the fields of cleaning, heat preservation and acoustic adjustment, so that great success is achieved. However, the foam has too high water absorption due to extremely high open cell ratio, and the strength of the foam can not meet the requirements of external wall insulation materials, so that the melamine formaldehyde resin open cell foam is difficult to be applied to the field of external wall insulation. In contrast, the melamine closed-cell foam can well meet the requirements of the external wall thermal insulation material.
For example, in the published document CN201210328428, a method for preparing a melamine formaldehyde resin closed-cell foam is disclosed, the foam prepared by the method has high closed-cell rate and oxygen index and low thermal conductivity, however, the prepared foam prepolymer resin is solid and needs to be used after being dissolved by a viscosity modifier, and particularly, the viscosity modifier is a flammable organic solvent, so that the flame retardant property of the foam is reduced to a certain extent. In addition, the prepolymer is solid, which increases the difficulty of industrialization. CN 2013106482 adopts a method of etherifying melamine resin under acidic condition to reduce the viscosity of the resin, and uses polyethylene glycol and the like to improve the toughness of the resin, which also has beneficial effects. CN201410494905 discloses a technical scheme of modifying melamine resin by using methanol as a solvent and by using carbonate, although melamine rigid foam with good flame retardancy is prepared, alcohol substances are difficult to completely remove due to the increase of the amount of synthetic resin in industrial amplification, so that foam quality is unstable, and certain pollution is caused to the environment.
Disclosure of Invention
In order to solve the technical problems, the invention provides a preparation method of melamine rigid closed-cell foam. The melamine formaldehyde resin closed-cell foam prepared by the method is not easy to pulverize, has high compressive strength and strong bonding capacity with a base material, and meanwhile, the viscosity of the foam prepolymer resin is proper, so that the industrial continuous production is convenient to realize.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a process for the preparation of a melamine rigid closed cell foam comprising the steps of:
1) synthesis of the melamine rigid closed-cell foam resin, melamine, paraformaldehyde, hydroxyethyl melamine and diamine are added into a reaction vessel in proportion, the reaction is carried out at 70-90 ℃ until the materials are clear and transparent, and then the temperature is reduced to 60-70 ℃ for continuous reaction for 2-4h to obtain the foam resin.
Preferably, the hydroxyethylmelamine is any one or a mixture of several of N-mono (5-hydroxy-3-oxapentyl) melamine, N, N '-bis (5-hydroxy-3-oxapentyl) melamine and N, N' -tris (5-hydroxy-3-oxapentyl) melamine. The diamine is any one or a mixture of more of 1, 2-propane diamine, 1, 3-propane diamine, 1, 4-butane diamine, 1, 5-pentane diamine and 1, 6-hexane diamine.
Preferably, the molar ratio of the melamine to the paraformaldehyde is 1:1.5-3.5, the molar ratio of the melamine to the hydroxyethylmelamine is 1:0.1-0.3, and the molar ratio of the melamine to the diamine is 1: 0.05-0.2.
2) Preparation of the melamine rigid closed-cell foam, the foaming resin obtained in the step 1) is uniformly mixed with a surfactant, a curing agent, a foaming agent and an auxiliary agent, then poured into a mold, foamed at 60-80 ℃ for 15-30min, and then continuously cured at 80-120 ℃ for 2-3h to obtain the melamine rigid closed-cell foam.
Preferably, the surfactant is selected from one or a mixture of several of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate and sodium nonylphenol polyoxyethylene ether sulfate. The curing agent is selected from any one or a mixture of several of formic acid, acetic acid, oxalic acid, p-toluenesulfonic acid, sulfuric acid, phosphoric acid and hydrochloric acid. The foaming agent is selected from any one or a mixture of several of n-pentane, cyclopentane, n-hexane, cyclohexane and monofluorodichloroethane. The auxiliary agent is selected from any one or a mixture of more of silicone oil and silane coupling agent.
Preferably, the weight ratio of the foaming resin to the surfactant, the curing agent, the foaming agent and the auxiliary agent is 100: 1-10: 2-6: 1-8: 1-10.
When water is used as a solvent, the viscosity of the melamine formaldehyde resin with the same solid content is higher than that of CN201410494905, which causes great trouble to the material conveying and distribution in the industrial preparation process of the foaming resin. Therefore, the basic idea of the invention is to properly reduce the solid content of the resin and reduce the crosslinking degree of the melamine formaldehyde resin by using the hydroxyethyl melamine so as to reduce the viscosity of the resin when synthesizing the melamine formaldehyde resin; the cross-linking of the linear chain diamine and the melamine formaldehyde resin increases the length of a cross-linking chain segment, reduces the viscosity of the resin, and improves the defects of larger brittleness and easy pulverization of closed-cell foam. Although a reduction in solids content is detrimental to the formation of closed cell foams, by optimizing the combination of modifiers and improving the foaming process, rigid closed cell melamine foams with better physical properties are still obtained. More advantageously, the use of water as a solvent avoids the problem that the quality of melamine rigid foam is unstable in the foaming process due to the fact that alcohols are not easily removed in the mass synthesis of resin, and also avoids the problem of environmental pollution caused by alcohol residues.
Compared with the prior art, the invention has the beneficial effects that:
according to the melamine formaldehyde rigid closed-cell foam prepared by the invention, through modifying the melamine formaldehyde resin, the viscosity and the crosslinking density of the melamine formaldehyde resin are reduced, so that the brittleness of the melamine formaldehyde resin closed-cell foam is improved, and the strength of the melamine formaldehyde foam is improved.
And (II) through the improvement of the process, the viscosity of the melamine rigid closed-cell foam foaming resin is greatly reduced, the material conveying and cloth foaming processes in the continuous production process are facilitated, the synthesis process of the melamine formaldehyde resin is simplified, and the mass preparation of the resin is easier to realize, so that the industrialization is realized. The melamine prepared by the invention does not fall off powder when being foamed, has strong caking property, and can be compounded with various materials such as metal, non-woven fabrics, cement and the like for use.
And (III) the high closed-cell rate can effectively reduce the water absorption rate and the heat conductivity coefficient of the foam, so that the foam can be applied to air-conditioning air pipes, sandwich plates and building external wall heat-insulation markets.
Detailed Description
In order to facilitate the understanding of the present disclosure, the process described in the present disclosure will be further described with reference to specific embodiments, to which the present disclosure is not limited or restricted. A person skilled in the art may make numerous insubstantial modifications and adaptations to the invention as described herein, but it will nevertheless be understood that the scope of the subject matter described herein is limited to the examples described below.
Comparative example 1:
the preparation method is adopted in CN201410494905, namely 252g of melamine, 50.4g of benzoguanamine, 205g of paraformaldehyde, 40g of hydroxyethylmelamine and 145g of methanol are added into a 1L glass flask with stirring, the stirring is started to uniformly mix the materials, the pH value of the materials is adjusted to about 9.5 by using potassium hydroxide, the materials react in a water bath at the temperature of 75 ℃ until the materials are clear and transparent, 25g of dimethyl carbonate is added, the reaction is continued for 1h, then the vacuum is started to remove the methanol to obtain 130g of distillate, 63.5g of deionized water is added to adjust the solid content of the resin to 88%, the viscosity of the resin is 78000mpa.s (25 ℃), and the mixture is cooled for standby. This method can only be used to prepare small foams because of the excessive viscosity of the resin.
Taking 100g of the resin, 1.5g of sodium dodecyl benzene sulfonate serving as a surfactant, 5g of p-toluenesulfonic acid serving as a curing agent, 5g of n-pentane serving as a foaming agent, 3g of FQ-5503 serving as an auxiliary agent (Jiangsumeisi chemical Co., Ltd.) and forcibly mixing the materials uniformly at 1200rpm, pouring the mixture into a prepared die, placing the die into a 70 ℃ oven for foaming for 15min, and transferring the die to 100 ℃ for curing for 2h to obtain the foam MF 1.
Example 1:
252g of melamine, 75.6g of hydroxyethyl melamine, 194.4g of paraformaldehyde, 23.2g of hexamethylenediamine and 134.9g of water are added into a 1L glass flask with a stirrer, the stirring is started to uniformly mix the materials, the pH of the material is adjusted to about 9.5 by using triethylamine, the material is reacted in a water bath at 90 ℃ until the material is clear and transparent, and then the temperature is reduced to 70 ℃ for continuous reaction for 4 hours. The resin had a solids content of 80% and a viscosity of 12500mpa.s (25 ℃ C.), and was cooled for use.
Taking 100g of the resin, 1.5g of sodium dodecyl benzene sulfonate serving as a surfactant, 5g of p-toluenesulfonic acid serving as a curing agent, 5g of n-pentane serving as a foaming agent, 3g of FQ-5503 serving as an auxiliary agent (Jiangsumeisi chemical Co., Ltd.) and forcibly mixing the materials uniformly at 1200rpm, pouring the mixture into a prepared die, placing the die into a 70 ℃ oven for foaming for 15min, and transferring the die to 100 ℃ for curing for 2h to obtain the foam MF 2.
Example 2:
252g of melamine, 50.4g of hydroxyethyl melamine, 189.4g of paraformaldehyde, 23.2g of hexamethylenediamine and 128.7g of water are added into a 1L glass flask with a stirrer, the stirring is started to uniformly mix the materials, the pH of the material is adjusted to about 9.5 by using triethylamine, the materials are reacted in a water bath at 90 ℃ until the material is clear and transparent, and then the temperature is reduced to 70 ℃ for continuous reaction for 4 hours. The resin had a solids content of 80% and a viscosity of 13000mpa.s (25 ℃ C.), and was cooled until use.
Taking 100g of the resin, 1.5g of sodium dodecyl benzene sulfonate serving as a surfactant, 5g of phosphoric acid serving as a curing agent (85%), 5g of n-pentane serving as a foaming agent and 3g of a silane coupling agent KBE-403 (shin-Etsu chemical organosilicon Co., Ltd.) to be uniformly mixed by force at 1200rpm, pouring the mixture into a prepared mould, placing the mould into a 70 ℃ oven to foam for 15min, and then transferring the mixture to 100 ℃ to be cured for 2h to obtain foam MF 3.
Example 3:
252g of melamine, 25.2g of hydroxyethyl melamine, 184.8g of paraformaldehyde, 17.6g of butanediamine and 119.9g of water are added into a 1L glass flask with a stirrer, the stirring is started to uniformly mix the materials, the pH of the material is adjusted to about 9.5 by using diethanolamine, the reaction is carried out in a water bath at 90 ℃ until the material is clear and transparent, and then the temperature is reduced to 70 ℃ for continuous reaction for 4 hours. The resin had a solids content of 80% and a viscosity of 13700mpa.s (25 ℃ C.) and was cooled until use.
Taking 100g of the resin, 1.5g of sodium nonylphenol polyoxyethylene ether sulfate serving as a surfactant, 5g of sulfuric acid (65%) serving as a curing agent, 5g of cyclopentane serving as a foaming agent and 3g of KBE-402 (shin-Etsu chemical organosilicon Co., Ltd.) serving as a silane coupling agent, forcibly and uniformly mixing at 1200rpm, pouring into a prepared mold, placing into an oven at 70 ℃ for foaming for 15min, and transferring to 100 ℃ for curing for 2h to obtain foam MF 4.
Example 4:
adding 5040g of melamine, 504g of hydroxyethyl melamine, 3788g of paraformaldehyde, 464g of hexamethylene diamine and 2574g of water into a 20L glass flask with a stirrer, starting stirring to uniformly mix the materials, adjusting the pH of the materials to about 9.5 by using sodium hydroxide, heating the materials to 90 ℃ by using a heating sleeve, keeping the temperature until the materials are clear and transparent, and cooling to 70 ℃ to continue reacting for 3 hours. The resin has a solids content of 80% and a viscosity of 14300mpa.s (25 ℃) and is ready for use by cooling.
500g of the resin, 7.5g of sodium nonylphenol polyoxyethylene ether sulfate serving as a surfactant, 25g of formic acid serving as a curing agent (88%), 25g of n-pentane serving as a foaming agent and 15g of phenolic foam silicone oil FQ-5502 serving as an auxiliary agent (Jiangsumeisi chemical Co., Ltd.) are taken and mixed uniformly by force at 1200rpm, the mixture is poured into a prepared die, the die is placed into a 70 ℃ oven for foaming for 15min and then is transferred to 100 ℃ for curing for 2h, and the foam MF5 is obtained.
Example 5:
adding 75.6kg of melamine, 15.1kg of hydroxyethyl melamine, 56.8kg of paraformaldehyde, 7.0kg of hexamethylenediamine and 38.6kg of water into a 200L planetary reaction kettle, starting stirring to uniformly mix the materials, adjusting the pH of the material to about 9.5 by using triethylamine, heating the material to about 90 ℃ by using heat conduction oil, reacting at constant temperature until the material is clear and transparent, and cooling to 70 ℃ to continue reacting for 3 hours. The resin had a solids content of 80% and a viscosity of 15100mpa.s (25 ℃ C.), and was cooled until use.
1000g of the resin, 15g of sodium nonylphenol polyoxyethylene ether sulfate serving as a surfactant, 50g of formic acid serving as a curing agent (88%), 50g of n-hexane serving as a foaming agent, 30g of phenolic foam silicone oil FQ-5502 serving as an auxiliary agent (Jiangsumeisi chemical Co., Ltd.) are taken and mixed uniformly by force at 600rpm, the mixture is poured into a prepared die, the die is placed into a 70 ℃ oven for foaming for 15min and then is transferred to 100 ℃ for curing for 2h, and foam MF6 is obtained.
The foams obtained in comparative example 1, and examples 1 to 5 were then tested according to the standard. The test results are given in the following table:
| item | Unit of | MF1 | MF2 | MF3 | MF4 | MF5 | MF6 |
| Density of | kg/m3 | 41 | 40 | 40 | 42 | 40 | 41 |
| Coefficient of thermal conductivity | w/m·k | 0.031 | 0.029 | 0.028 | 0.029 | 0.031 | 0.030 |
| Compression performance | kpa | 210 | 217 | 227 | 219 | 230 | 235 |
| Volumetric water absorption | ％ | 2.3 | 2.2 | 1.2 | 1.6 | 1.6 | 1.7 |
| Powder falling rate | ％ | 5.3 | 3.5 | 4.1 | 4.4 | 4.1 | 3.9 |
| Dimensional stability | ％ | 1.2 | 1.9 | 1.5 | 1.2 | 1.4 | 1.2 |
Density was tested according to GB/T6343-2009;
the heat conductivity coefficient is tested according to the steady-state thermal resistance of the heat-insulating material GB/T10294-2008;
the compressive strength is tested according to the GB/T15048-1994 rigid foam compression creep test method;
the volume water absorption rate is tested according to the water absorption rate of GB/T8810-2005 rigid foam;
and (3) testing the dimensional stability GB/T8811-2008 rigid foam dimensional stability test method.
Powder fall was measured by applying a 200g weight to a 60mm by 30mm coupon and moving 5m (100mm by 50 times) over 100# sandpaper.
The data show that the resin prepared by the invention has lower viscosity, is easier to realize industrialization, has high closed-cell rate of foam prepared by the resin and excellent heat-insulating property, and is suitable for being used as a heat-insulating material.
Although the present invention has been described in detail with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the scope of the invention encompassed by the appended claims.
Claims (8)
1. A process for the preparation of a melamine rigid closed cell foam, characterized in that it comprises the following steps:
1) synthesis of melamine rigid closed-cell foam foaming resin
Adding melamine, paraformaldehyde, hydroxyethyl melamine and diamine into a reaction vessel in proportion, reacting at 70-90 ℃ until the materials are clear and transparent, and then cooling to 60-70 ℃ for continuous reaction for 2-4h to obtain foamed resin; the mol ratio of melamine to paraformaldehyde is 1:1.5-3.5, the mol ratio of melamine to ethoxyl ethyl melamine is 1:0.1-0.3, and the mol ratio of melamine to diamine is 1: 0.05-0.2;
2) preparation of melamine rigid closed cell foam
Uniformly mixing the foamed resin obtained in the step 1) with a surfactant, a curing agent, a foaming agent and an auxiliary agent, pouring the mixture into a mold, foaming for 15-30min at the temperature of 60-80 ℃, and continuously curing for 2-3h at the temperature of 80-120 ℃ to obtain the melamine rigid closed-cell foam.
2. A process for the preparation of a melamine rigid closed cell foam according to claim 1, characterized in that: the hydroxyethyl melamine is any one or a mixture of more of N-mono (5-hydroxy-3-oxapentyl) melamine, N, N '-bis (5-hydroxy-3-oxapentyl) melamine and N, N' -tris (5-hydroxy-3-oxapentyl) melamine.
3. A process for the preparation of a melamine rigid closed cell foam according to claim 1, characterized in that: the diamine is any one or a mixture of more of 1, 2-propane diamine, 1, 3-propane diamine, 1, 4-butane diamine, 1, 5-pentane diamine and 1, 6-hexane diamine.
4. A process for the preparation of a melamine rigid closed cell foam according to claim 1, characterized in that: the surfactant is selected from one or a mixture of more of sodium dodecyl benzene sulfonate, sodium dodecyl sulfate and sodium nonylphenol polyoxyethylene ether sulfate.
5. A process for the preparation of a melamine rigid closed cell foam according to claim 1, characterized in that: the curing agent is selected from any one or a mixture of several of formic acid, acetic acid, oxalic acid, p-toluenesulfonic acid, sulfuric acid, phosphoric acid and hydrochloric acid.
6. A process for the preparation of a melamine rigid closed cell foam according to claim 1, characterized in that: the foaming agent is selected from any one or a mixture of several of n-pentane, cyclopentane, n-hexane, cyclohexane and monofluorodichloroethane.
7. A process for the preparation of a melamine rigid closed cell foam according to claim 1, characterized in that: the auxiliary agent is selected from any one or a mixture of more of silicone oil and silane coupling agent.
8. A process for the preparation of a melamine rigid closed cell foam according to claim 1, characterized in that: the weight ratio of the foaming resin to the surfactant, the curing agent, the foaming agent and the auxiliary agent is 100: 1-10: 2-6: 1-8: 1-10.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3512446A1 (en) * | 1985-04-04 | 1986-10-16 | Cassella Ag, 6000 Frankfurt | MODIFIED MELAMINE RESIN, ITS PRODUCTION AND USE, AND THE MODIFIER |
| CN104250386A (en) * | 2014-09-25 | 2014-12-31 | 四川金象赛瑞化工股份有限公司 | Preparation method of flame-retardant melamine hard foam |
| CN106832164A (en) * | 2017-02-27 | 2017-06-13 | 天津市居安泰科技有限公司 | A kind of rigid foam preparation method of tripolycyanamide amino resin |
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2018
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3512446A1 (en) * | 1985-04-04 | 1986-10-16 | Cassella Ag, 6000 Frankfurt | MODIFIED MELAMINE RESIN, ITS PRODUCTION AND USE, AND THE MODIFIER |
| CN104250386A (en) * | 2014-09-25 | 2014-12-31 | 四川金象赛瑞化工股份有限公司 | Preparation method of flame-retardant melamine hard foam |
| CN106832164A (en) * | 2017-02-27 | 2017-06-13 | 天津市居安泰科技有限公司 | A kind of rigid foam preparation method of tripolycyanamide amino resin |
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