CN102276956B - Food contact phenolic molding compound and its preparation method and application - Google Patents
Food contact phenolic molding compound and its preparation method and application Download PDFInfo
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- CN102276956B CN102276956B CN 201110138645 CN201110138645A CN102276956B CN 102276956 B CN102276956 B CN 102276956B CN 201110138645 CN201110138645 CN 201110138645 CN 201110138645 A CN201110138645 A CN 201110138645A CN 102276956 B CN102276956 B CN 102276956B
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Abstract
The invention provides a food contact phenolic molding compound, which is made from the following raw materials of: by weight, (1) 30-50% of a phenolic resin; (2) 10-40% of a wood powder; (3) 10-30% of a mineral filler; (4) 4-9% of urotropine; (5) 0.5-2% of carbon black. The invention also discloses a preparation method and an application of the food contact phenolic molding compound. The phenolic molding compound provided by the invention can be safely used on the surface of food contact products and reaches the standard of FDA 21CFR 177.2410.
Description
Technical field
The present invention relates to a kind of phenolaldehyde moulding compound and preparation method thereof, phenolaldehyde moulding compound of a kind of specifically Food Contact level and its production and use.
Background technology
Food and drug administration (Food and Drug Administration) is called for short FDA, Food Contact class material refers to that all are used for the material that processing packing storage transporting food products process and food can touch, common material comprises various plastics, metal, pottery, glass, bamboo wood etc., the Environmental Safety situation of the material that these and food can touch directly concerning user's safe diet and health, need authenticate according to the detection that the FDA standard is correlated with so this series products is exported to the U.S..FDA21CFR 177.2410 be in the FDA with the phenolic materials examination criteria of food contact material safety command, standard code refluxed 2 hours with distilled water, contact surface extract per square inch should meet following restriction: 1, general extractive is no more than 0.15 milligram; 2, Hydroxybenzene Extract is no more than 0.005 milligram; 3, the aniline extract is no more than 0.006 milligram.
Phenolaldehyde moulding compound claims bakelite powder and bakelite again, is a kind of broad-spectrum thermosetting resin, till now, in thermosetting resin still the turnout maximum, use the most general.Phenolaldehyde moulding compound is made up of with certain proportioning resol, filler, lubricant and solidifying agent etc.The content of resol is generally 35～65%, and filler is generally wood powder, lime carbonate, mica, kaolin, talcum powder or glass fibre etc.Contain objectionable impuritiess such as free phenol, formaldehyde because of common phenolaldehyde moulding compound toxic to human body, so general bakelite goods should not be done food service items and food product pack.
Summary of the invention
Technical problem to be solved by this invention provides phenolaldehyde moulding compound of a kind of Food Contact level and its production and use, and phenolaldehyde moulding compound shell of the present invention is used for and the Food Contact product surface safely, reaches FDA 21CFR 177.2410 standards.
Technical problem to be solved by this invention can be achieved through the following technical solutions:
A kind of phenolaldehyde moulding compound of Food Contact level is prepared from by following raw materials by weight percent: (1) resol 30～50%; (2) wood powder 10～40%; (3) mineral filler 10～30%; (4) urotropine 4～9%; (5) carbon black 0.5～2%.
The present invention uses resol as tackiness agent.The resol that is adopted is the catalytic novolac resin of oxalic acid, account for Food Contact level of the present invention phenolaldehyde moulding compound weight 30～50%, but 38～48% weight proportion scope can better satisfy the requirement of technology to indexs such as resin softening point, viscosity, gel times, content of harmful such as control free phenol, free formaldehyde, make free phenol less than 1%, can satisfy Hydroxybenzene Extract index and aniline extract index request.
The present invention uses wood powder as strongthener.Described wood powder fineness is 80～150 orders, moisture≤8%, apparent density 0.15～0.27g/cm
3, ash content＜3%.The wood powder that phenolaldehyde moulding compound adopted of Food Contact level of the present invention must be through the citric acid purification processes.Wood powder can be removed soluble impurity through the citric acid purification processes, reaches the general extractive index request.The consumption of wood powder account for Food Contact level of the present invention phenolaldehyde moulding compound weight 10～40%, but 20～35% quality ratio range is better relatively.
The mineral filler that the present invention uses is a toothpaste level aluminium hydroxide, has guaranteed the good thermotolerance of material, flame retardant resistance and electrical insulation capability, and toothpaste level aluminium hydroxide raw material is through 1200 ℃ of pyroprocessing, has guaranteed that toothpaste level aluminium hydroxide has the chemical property of stabilizer pole.The consumption of aluminium hydroxide account for Food Contact level of the present invention phenolaldehyde moulding compound weight 10～30%, but 10～25% weight proportion scope is better relatively.
The present invention uses urotropine as solidifying agent, and particle diameter is 200～300 orders.The urotropine firming agent consumption account for Food Contact level of the present invention phenolaldehyde moulding compound weight 4～9%, but 5～8% weight proportion scopes are better relatively.Urotropine self belongs to the moderate toxicity chemical, and curing reaction is emitted ammonia, so strict control urotropine consumption with harmful substance contents such as control free ammonias, guarantees the processing characteristics of material excellence simultaneously again, to satisfy the injection molding technique requirement.
It is as tinting material that the present invention adopts the carbon black of specifying U.S. Cabot Co.,Ltd to produce.The carbon black that U.S. Cabot Co.,Ltd produces has remarkable blackness, very strong tinting strength and splendid dispersed and stable, and can satisfy the general extractive index request.
The present invention can also add additive as required, wherein additive can lubricant stearic acid zinc and curing catalyst be magnesium oxide, wherein the weight percent of resin acid zinc addition is 1～3%, the weight percent of magnesium oxide addition is 1～3%.
The preparation method of the phenolaldehyde moulding compound of Food Contact level of the present invention is:
(1) wood powder being immersed weight percent concentration is that 3～4% citric acid solutions were washed 2 hours, washes half an hour through clear water again after the filtration, and oven dry dewaters.
(2) resol is pulverized, with behind the wood powder of citric acid purification processes, urotropine, toothpaste level aluminium hydroxide, carbon black uniform mixing, through the pulverizing granulation of plasticating.
In described preparation method's step (2), can also add weight percent and be 1～3% stearic zinc and weight percent and be 1～3% magnesium oxide.
The phenolaldehyde moulding compound of Food Contact level of the present invention can be used for making tableware, food pack.
The invention has the beneficial effects as follows the phenolaldehyde moulding compound that a kind of Food Contact level is provided, phenolaldehyde moulding compound of the present invention can be used for and the Food Contact product surface safely, reach FDA 21CFR 177.2410 standards, for Food Contact articles for use such as cooker, tableware, packing, processor, transport pipeline, container etc. provide a kind of ideal formed material.And the method for the phenolaldehyde moulding compound of preparation Food Contact level is simple, easy to operate.
Embodiment
The present invention will be further described below in conjunction with embodiment, but be not limited to scope of the present invention.
Embodiment 1
It is that 3～4% citric acid solutions were washed 2 hours that the 28kg wood powder is immersed weight percent concentration, washes half an hour through clear water again after the filtration, and oven dry dewaters.
37kg resol is pulverized, with behind the 28kg of citric acid purification processes wood powder, 5.9kg urotropine, 23.6kg toothpaste level aluminium hydroxide, 2kg carbon black, 1.5kg magnesium oxide and 2kg Zinic stearas uniform mixing, through the pulverizing granulation of plasticating.
Embodiment 2
It is that 3～4% citric acid solutions were washed 2 hours that the 29kg wood powder is immersed weight percent concentration, washes half an hour through clear water again after the filtration, and oven dry dewaters.
38kg resol is pulverized, with behind the 29kg of citric acid purification processes wood powder, 6.1kg urotropine, 20.9kg toothpaste level aluminium hydroxide, 2kg carbon black, 1kg magnesium oxide and 3kg Zinc Stearate uniform mixing, through the pulverizing granulation of plasticating.
Embodiment 3
It is that 3～4% citric acid solutions were washed 2 hours that the 30kg wood powder is immersed weight percent concentration, washes half an hour through clear water again after the filtration, and oven dry dewaters.
40kg resol is pulverized, with behind the 30kg of citric acid purification processes wood powder, 6.4kg urotropine, 17.6kg toothpaste level aluminium hydroxide, 2kg carbon black, 3kg magnesium oxide and 1kg Zinc Stearate uniform mixing, through the pulverizing granulation of plasticating.
Embodiment 4
It is that 3～4% citric acid solutions were washed 2 hours that the 34.8kg wood powder is immersed weight percent concentration, washes half an hour through clear water again after the filtration, and oven dry dewaters.
41.5kg resol is pulverized, with behind the 34.8kg of citric acid purification processes wood powder, 6.6kg urotropine, 11.6kg toothpaste level aluminium hydroxide, 2kg carbon black, 1.5kg magnesium oxide and 2kg Zinc Stearate uniform mixing, through the pulverizing granulation of plasticating.
Embodiment 5
It is that 3～4% citric acid solutions were washed 2 hours that the 32kg wood powder is immersed weight percent concentration, washes half an hour through clear water again after the filtration, and oven dry dewaters.
43kg resol is pulverized, with behind the 32kg of citric acid purification processes wood powder, 6.8kg urotropine, 13.7kg toothpaste level aluminium hydroxide, 1kg carbon black, 1.5kg magnesium oxide and 2kg Zinc Stearate uniform mixing, through the pulverizing granulation of plasticating.
Embodiment 6
It is that 3～4% citric acid solutions were washed 2 hours that the 33kg wood powder is immersed weight percent concentration, washes half an hour through clear water again after the filtration, and oven dry dewaters.
44.5kg resol is pulverized, with behind the 33kg of citric acid purification processes wood powder, 7kg urotropine, 11.5kg toothpaste level aluminium hydroxide, 0.5kg carbon black, 1.5kg magnesium oxide and 2kg Zinc Stearate uniform mixing, through the pulverizing granulation of plasticating.
The contriver measures the performance index that the present invention prepares the phenolaldehyde moulding compound of gained, and the phenolaldehyde moulding compound that proves the Food Contact level of the present invention preparation can be used for the feasibility of Food Contact articles for use such as cooker, tableware, packing, processor, transport pipeline, container.
Table 1 is 6 embodiment of the phenolaldehyde moulding compound of Food Contact level of the present invention, each integral part adopts following specification and model: (1) novolac resin, free phenol is less than 1%, 82～95 ℃ of softening temperatures, viscosity 14～18 centipoises, 35～65 seconds/150 ℃ of gel times, Ouya Composite Material Co., Ltd., Shanghai produces.(2) wood powder, fineness are 80～150 orders, and moisture≤8%, apparent density 0.15～0.27g/cm3, ash content＜3.0%, Huzhou, Zhejiang Hai Ke truly Mierocrystalline cellulose company limited are produced.(3) carbon black, model M1300, U.S. Cabot Co.,Ltd produces.(4) urotropine, particle diameter 50um, the huge chemical industry in Shanxi, Zhejiang company limited produces.(5) aluminium hydroxide, toothpaste level, Shandong Aluminium Industrial Corp's alumina producer.(6) magnesium oxide, fineness 200 orders, the Xi Er of Haicheng City Cigna mining industry company limited.(7) Zinc Stearate, fineness 325 orders send out chemical (Zhangjiagang) company limited basic.
Each integral part proportion and the performance index of embodiment 1-6 all are listed in this table.Extract in the table 1 is pressed FDA 21CFR 177.2410 standard testings, and other performance index are pressed the ISO14526-2 standard testing.
Table 1
More than show and described ultimate principle of the present invention, principal character and advantage of the present invention.The technician of the industry should understand; the present invention is not restricted to the described embodiments; that describes in the foregoing description and the specification sheets just illustrates principle of the present invention; the present invention also has various changes and modifications without departing from the spirit and scope of the present invention, and these changes and improvements all fall in the claimed scope of the invention.The protection domain that the present invention requires is defined by appending claims and equivalent thereof.
Claims (4)
1. the phenolaldehyde moulding compound of a Food Contact level is characterized in that, is prepared from by following raw materials by weight percent: (1) resol 30%～50%; (2) wood powder 20～35%; (3) mineral filler 10～25%; (4) urotropine 4～9%; (5) carbon black 0.5～2%; (6) lubricant stearic acid zinc 1～3%; Curing catalyst magnesium oxide 1～3%;
Described wood powder fineness is 80～150 orders, Shui Fen ≦ 8%, and apparent density is 0.15～0.27g/cm
3, ash content＜3%;
Described mineral filler is a toothpaste level aluminium hydroxide;
The preparation method of the phenolaldehyde moulding compound of described Food Contact level may further comprise the steps:
(1) wood powder being immersed weight percent concentration is that 3～4% citric acid solutions were washed 2 hours, washes half an hour through clear water again after the filtration, and oven dry dewaters;
(2) resol is pulverized, with behind the wood powder of citric acid purification processes, urotropine, toothpaste level aluminium hydroxide, carbon black, lubricant stearic acid zinc, curing catalyst magnesium oxide uniform mixing, through the pulverizing granulation of plasticating.
2. the phenolaldehyde moulding compound of a kind of Food Contact level according to claim 1 is characterized in that, described resol is oxalic acid catalysis solid thermoplastics resol, and free phenol is less than 1%, and the weight percent of resol is 38～48%.
3. the phenolaldehyde moulding compound of a kind of Food Contact level according to claim 1 is characterized in that, described urotropine particle diameter is 200～300 orders, and the weight percent of Wu Luotuo is 5～8%.
4. the purposes of the phenolaldehyde moulding compound of a kind of Food Contact level of claim 1 is characterized in that, is used for making tableware or food pack.
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| CN106243604A (en) * | 2016-08-03 | 2016-12-21 | 海宁长林包装材料有限公司 | A kind of high temperature resistant waterproof combined package bag film and preparation method thereof |
| CN111574807A (en) * | 2019-02-18 | 2020-08-25 | 顾爱飞 | Bakelite powder particle capable of effectively containing reacted thermosetting plastic and preparation method thereof |
| CN112143168A (en) * | 2020-10-15 | 2020-12-29 | 吴江鼎泰电子材料有限公司 | Preparation method and application of high-strength plastic packaging material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101182382A (en) * | 2006-11-13 | 2008-05-21 | 浙江南方塑胶制造有限公司 | Cashew nut oil modified alkyd resin moulding material and preparation method thereof |
| CN101665613A (en) * | 2009-09-24 | 2010-03-10 | 上海欧亚合成材料有限公司 | High-temperature baking resistant phenolic molding compound and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101182382A (en) * | 2006-11-13 | 2008-05-21 | 浙江南方塑胶制造有限公司 | Cashew nut oil modified alkyd resin moulding material and preparation method thereof |
| CN101665613A (en) * | 2009-09-24 | 2010-03-10 | 上海欧亚合成材料有限公司 | High-temperature baking resistant phenolic molding compound and preparation method thereof |
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Address after: 201512 Shanghai Jinshan District jin'ou Road No. 500 Patentee after: Shanghai Eurasian synthetic materials Co., Ltd Address before: 201102 No. 88 Wanyuan Road, Shanghai, Minhang District Patentee before: Ouya Composite Material Co., Ltd., Shanghai |
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