A kind of have acidproof, a high temperature resistant sterilization water-based pop can inner-wall paint
Technical field
The present invention relates to a kind of acidproof, high temperature resistant sterilization water-based pop can inner-wall paint that has.
Background technology
Food especially beverage, seasonings, drinks etc. is larger to the corrodibility of its packaging material and container, to having relatively high expectations of food product containers, wrapping material erosion resistance.Therefore, to the inwall of food product containers, wrapping material be coated with that last layer is acidproof, oil resistant, alkaline-resisting anticorrosive coating.The hygienic quality of coating directly affects food consumption safety.The coating that is used for the food product containers inwall must meet strict environmental requirement, and powder coating and water-borne coatings are existing in canning industry to be used widely.There is not volatile organic solvent in powder coating, but has some shortcomings yet: coating thickness is large, the powder recovery utilization rate is low, the equipment front-end investment is large and the hidden danger etc. of dust explosion is arranged.By contrast, water-borne coatings does not then have these problems.
The food product containers coating that uses at present is according to the coated material system that can roughly be divided three classes: polyvinyl chloride system, Amino-Polyester system, epoxy-resin systems.
Polyvinyl chloride (PVC) coating is equipped with the auxiliary agents such as softening agent, water, solvent take polyvinyl chloride (PVC) RESINS (PVC) as raw material, high temperature drying film forming after roller coat or spraying.Still may contain the residual of vinylchlorid in the polyvinyl chloride (PVC) coating, and vinyl chloride monomer belongs to carcinogenic substance, the content of vinyl chloride monomer should be in 1ppm, coating under this condition is safe to human body, this is also approved by U.S. FDA, but European Union and Partial Food security study mechanism hold the suspicious attitude to this at present, and the easy breakdown of emulsion of water-based PVC emulsion, poor storage stability.
The Amino-Polyester system is to adopt vibrin to cooperate through high bake with terpolycyantoamino-formaldehyde resin fully to solidify, make the fully volatilization such as solvent, water, monomer, the reaction of this hot setting is irreversible reaction, can not react with Dissolve things inside food behind the coating curing, and security is extensively proved.But this system is because containing ester bond, facile hydrolysis, and chemical-resistant is slightly poorer than the above two, is mainly used in sterilization and endurance is less demanding or the Three piece Can body coating of dried food and nuts packing.
Resins, epoxy generally is polymerized by dihydroxyphenyl propane (diphenylol propane) and epoxy chloropropane.Different according to extent of polymerization, the molecular weight of Resins, epoxy is also different.From the hygiology angle, molecular weight is more large more stable, and the stripping of more difficult generation objectionable impurities is moved in food, so its security is higher.The main hygienic issues of epoxypaint is the quality (being the oxirane value of Resins, epoxy) of Resins, epoxy, proportioning and the degree of cure of solidifying agent.The solidifying agent proportioning is suitable, and degree of cure is higher, and the uncured material that moves in the food in the epoxypaint is fewer.This system is generally adopted by international well because of solidity to corrosion at present, and usage quantity is maximum.Particularly aqueous epoxy coating has the trend that replaces PVC, aqueous epoxy resins typically refers to Resins, epoxy and is scattered in formed emulsion or water dispersion in the water with particulate, drop or colloidal form, and difference between the two is that the particle diameter of Resins, epoxy disperse phase is different.According to preparation method's difference, water-borne modification of epoxy resin has following four kinds of methods: mechanical process, chemic modified method, phase inversion and solidifying agent emulsion process etc.The aqueous epoxy resin emulsion that can be used for coating in the tank of developing in recent years adopts the chemic modified method preparation usually, usually relatively poor with the high temperature resistant sterilization of aqueous epoxy resin emulsion, the chemical-resistant of chemic modified method preparation, there is hidden danger for the storage of canned food, hygienic safety etc.
Summary of the invention
The purpose of this invention is to provide a kind of acidproof, high temperature resistant sterilization water-based pop can inner-wall paint that has.
The technical solution used in the present invention is:
A kind of have acidproof, a high temperature resistant sterilization water-based pop can inner-wall paint, and it comprises the raw material of following mass parts: the water soluble acrylic acid monomer graft modification epoxy phosphate ester resin of 15-30 part, 1-3 part water-compatible amino resin, 0.2-0.8 part acid catalyst, 0.1-0.5 part wetting agent, 0.1-0.3 part defoamer, 2-5 part solubility promoter.
Described water soluble acrylic acid monomer graft modification epoxy phosphate ester resin is synthetic through following steps:
1) pre-emulsification: under the room temperature, OP-10 and Sodium dodecylbenzene sulfonate DBS are added to the water, and stirring and dissolving obtains the composite emulsifying agent solution, get the 1/2-3/4 of composite emulsifying agent solution, the Resins, epoxy of getting again molecular weight 〉=3000 is dissolved in and makes epoxy resin solution in the acrylic monomer, and both are mixed, and stirs, both mass ratioes are 8:92 ~ 15:85, stir, make pre-emulsion, for subsequent use;
2) seed priming: the 1/10-1/9 that gets pre-emulsion, mix with residue composite emulsifying agent solution in the step 1), and the sodium bicarbonate of the 1/4-1/3 of adding Acrylic Acid Monomer quality, the speed of 3-4 ℃/min is warming up to 50-60 ℃, the Sodium Persulfate that adds the 1/5-1/4 of Acrylic Acid Monomer quality, temperature is raised to 80 ~ 90 ℃ until blue phase appears in system, and seed priming is complete;
3) polymerization: keep temperature of reaction, drip off the residue pre-emulsion in 2 ~ 3h, insulation 1 ~ 2h, the reaction product acid number is controlled in 25 ~ 40mgKOH/g scope;
4) esterification: under 90 ℃ ~ 100 ℃ conditions of constant temperature, drip phosphoric acid in 0.5h ~ 1h, regulate pH to 6.5-6.9, insulation 1-2h obtains water soluble acrylic acid monomer graft modification epoxy phosphate ester resin.
In the step 1), described Resins, epoxy quality and Acrylic Acid Monomer mass ratio are 1:1-2.
Described water-compatible amino resin is at least a among Ineos R747, M-03, M-11, the M-21.
Described acid catalyst is at least a among Powderlink MTSI, AD3325 DNNDSA, AD3315 DNNSA, the AD3302W p-TSA.
Described wetting agent is at least a among TEGO wet270, Tego wet kl245, the Tego wet 500.
Described defoamer is at least a among BYK-017, BYK-018, BYK-019, BYK-021, BYK-022, BYK-023, the BYK-044.
Described solubility promoter is butanols or propylene glycol monomethyl ether.
The invention has the beneficial effects as follows: coating of the present invention has preferably acidproof, high temperature resistant bactericidal property, simultaneously coating to environment without harm, to human body without injury, environmental protection.
Embodiment
Water soluble acrylic acid monomer graft modification epoxy phosphate ester resin is synthetic through following steps:
1) pre-emulsification: under the room temperature, OP-10 and Sodium dodecylbenzene sulfonate DBS are added to the water, stirring and dissolving obtains the composite emulsifying agent solution; Get the 1/2-3/4 of composite emulsifying agent solution, the Resins, epoxy of getting again molecular weight 〉=3000 is dissolved in the Acrylic Acid Monomer (Resins, epoxy quality and Acrylic Acid Monomer mass ratio are 1:1-2) makes epoxy resin solution, both are mixed, stir, composite emulsifying agent solution and the epoxy resin solution mass ratio got are 8:92 ~ 15:85, stir, make pre-emulsion, for subsequent use;
2) seed priming: the 1/10-1/9 that gets pre-emulsion, mix with residue composite emulsifying agent solution in the step 1), and the sodium bicarbonate of the 1/4-1/3 of adding Acrylic Acid Monomer quality, the speed of 3-4 ℃/min is warming up to 50 ℃, the Sodium Persulfate that adds the 1/5-1/4 of Acrylic Acid Monomer quality, temperature is raised to 80 ~ 90 ℃ until blue phase appears in system, and seed priming is complete;
3) polymerization: keep temperature of reaction, drip off the residue pre-emulsion in 2 ~ 3h, insulation 1 ~ 2h, the reaction product acid number is controlled in 25 ~ 40mgKOH/g scope;
4) esterification: under 90 ℃ ~ 100 ℃ conditions of constant temperature, drip phosphoric acid in 0.5h ~ 1h, regulate pH to 6.5-6.9, insulation 1-2h obtains water soluble acrylic acid monomer graft modification epoxy phosphate ester resin.
In the step 1), described Resins, epoxy model is a kind of among CYD-019, the CYD-020N.
In the step 4) in added phosphoric acid and the step 1) mol ratio of used Resins, epoxy be 2-3:1.
A kind of have acidproof, a high temperature resistant sterilization water-based pop can inner-wall paint, and its preparation method is as follows:
1) deionized water with water soluble acrylic acid monomer graft modification epoxy phosphate ester resin, water-compatible amino resin and 67-85 mass parts mixes, and obtains resin compound;
2) add acid catalyst, wetting agent, defoamer, solubility promoter in the mixture that obtains to step 1), stir, filter to get finished product.
Below in conjunction with specific embodiment prescription of the present invention is described:
Embodiment 1:
A kind of have acidproof, a high temperature resistant sterilization water-based pop can inner-wall paint, its raw material table 1 composed as follows:
Table 1: a kind of raw material with acidproof, high temperature resistant sterilization water-based pop can inner-wall paint forms
Embodiment 2:
A kind of have acidproof, a high temperature resistant sterilization water-based pop can inner-wall paint, its raw material table 2 composed as follows:
Table 2: a kind of raw material with acidproof, high temperature resistant sterilization water-based pop can inner-wall paint forms
Embodiment 3:
A kind of have acidproof, a high temperature resistant sterilization water-based pop can inner-wall paint, its raw material table 3 composed as follows:
Table 3: a kind of raw material with acidproof, high temperature resistant sterilization water-based pop can inner-wall paint forms
Embodiment 4:
A kind of have acidproof, a high temperature resistant sterilization water-based pop can inner-wall paint, its raw material table 4 composed as follows:
Table 4: a kind of raw material with acidproof, high temperature resistant sterilization water-based pop can inner-wall paint forms
Embodiment 5:
A kind of have acidproof, a high temperature resistant sterilization water-based pop can inner-wall paint, its raw material table 5 composed as follows:
Table 5: a kind of raw material with acidproof, high temperature resistant sterilization water-based pop can inner-wall paint forms
Below be the contrast of the performance of the performance of the coating that makes according to embodiment 1 and ICI coating:
Table 6: the performance comparison of coating
Can find out, coating of the present invention has well acidproof, high temperature resistant bactericidal property, and the key technical indexes meets or exceeds external advanced product.Simultaneously coating to environment without harm, to human body without injury, environmental protection.