CN102702749A - Preserving box and preparation method thereof - Google Patents
Preserving box and preparation method thereof Download PDFInfo
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- CN102702749A CN102702749A CN2012101973540A CN201210197354A CN102702749A CN 102702749 A CN102702749 A CN 102702749A CN 2012101973540 A CN2012101973540 A CN 2012101973540A CN 201210197354 A CN201210197354 A CN 201210197354A CN 102702749 A CN102702749 A CN 102702749A
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- crisper
- silica gel
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- adding proportion
- bridging agent
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Abstract
The invention discloses a preserving box and a preparation method thereof. The preserving box is made of silica gel which is subjected to secondary vulcanization, wherein the composition of the silica gel is polydimethyl silicon resin. The preparation method provided by the invention comprises the steps of: smelting the raw material; performing primary vulcanization; performing secondary vulcanization; trimming; and the like. The preserving box has heat resistance temperature of 40 DEG C below zero to 230 DEG C and does not release any harmful substance when used in a baking box and a microwave oven and during high-temperature heating.
Description
Technical field
The present invention relates to a kind of crisper and preparation method thereof, relate in particular to a kind of crisper that is prepared from the silica gel material after the post cure and preparation method thereof.
Background technology
Crisper in the market has the plastics crisper, the glasswork crisper.
The plastics crisper mainly constitutes PC-polycarbonate and PP-Vestolen PP 7052 by following two kinds of materials:
The PC goods have water white transparency, and are heat-resisting, shock resistance, advantage such as fire-retardant.But dihydroxyphenyl propane is the main raw material of PC goods; Can discharge dihydroxyphenyl propane (a kind of can cause children's sexual precocity and the chemical substance of bringing out into human cancer, metabolic disturbance) when in normal temperature, using sodium oxide to clean with alkaline cleansing agent; Wear no resistance on the physical property simultaneously, slightly streak and be prone to cut; The stress cracking degree is big, and is very easy to be cracked under the high-strength impact; The high temperature facile hydrolysis; Not anti-alkali corrosion; On October 18th, 2008, Canada announces that dihydroxyphenyl propane is a toxic chemical substance; In March, 2009 U.S.'s motion forbids in " reusable food product containers " and " other food product containers ", using (BPA); On May 30th, 2011,6 departments such as ministry of Health of China externally issue bulletin and claim, in view of the infant belongs to responsive crowd, for taking precautions against food safety risk, the protection infantile health forbids that dihydroxyphenyl propane is used for infant feeding bottle.
The advantage of PP goods: 100% pure PP goods are nontoxic, tasteless, and density is little, and intensity, rigidity, shock-resistance are all comparatively excellent.Can 100 ℃ with interior temperature under safety use.But the PP goods have following shortcoming: because the physical property of PP goods can become very crisp in the time of 0 ℃, frangible under impacting; The temperature that surpasses 100 ℃ is used yielding, aging; So generally can add a spot of ethene, spun glass, metal fusogen in the process of reproduction to improve the physical property of PP; And ethene is known farm crop ripener at present.Has extremely strong toxicity; Indeterminate behind the use ethene in the PP production process to the harm of human body.At present along with the use of PP is extensive gradually, domestic a large amount of factory uses reclaimed materials (being the PP domestic refuse that waste product has perhaps abandoned) to make crisper, causes a lot of on the market crisper security extreme differences simultaneously; Frangible, serious peculiar smell, indefinite chemicals serious harm human body safety.
The glass crisper comprises three kinds on the market; Simple glass; Toughened glass; High-boron-silicon glass.The glass crisper has transparency height, corrosion-resistant, high temperature resistant, advantage such as work-ing life is lasting.But because the higher characteristics of the coefficient of expansion of glass material own; Situation such as simple glass crisper and toughened glass crisper when heat and extremely cold very hot temperature violent change explosion can take place, splash; Can cause corresponding harm to the safety of human body, glass crisper goods also have shortcomings such as heavier, frangible, not portable simultaneously.Though and high-boron-silicon glass crisper heat resisting temperature is higher, also be difficult to be able to promote because its cost is higher.
Silicone resin; Formal name used at school polyorganosiloxane resin (English name: be to have highly cross-linked cancellated organopolysiloxane Silicone resin); Have the dual nature of organic resin and inorganic materials concurrently, silicone resin has unique physical and chemical performance, is the starting material of making Zylox or plastics.
Silica gel (Silica gel; Silica), another name Zylox is a kind of high reactivity sorbing material, belongs to amorphous substance, and water insoluble and any solvent is nonpoisonous and tasteless, and chemical property is stable, except that highly basic, hydrofluoric acid, does not react with any material; The science and technology environmental protection effectively guarantees household's health; Silica gel also has good water-repellancy, and no lipotropy is convenient for cleaning, water-saving and environmental protection, and the silica gel material is pliable and tough flexible, and is anti-aging, durable durable, can reuse.
Though silica gel material has heat-resisting ovenable roasting; Heat resisting temperature-40 ~ 230 ℃ can not discharge advantages such as any objectionable impurities, still when being used in baking box, microwave oven, heat; Because the hardness ratio of silica gel itself is relatively poor, so can not directly it be used for making crisper.
Summary of the invention
The object of the present invention is to provide a kind of crisper that is prepared from silica gel material through post cure; Can not directly it be used for making the problem of splendid attire vessel such as crisper to solve existing silica gel material because hardness ratio is relatively poor, another object of the present invention is to provide a kind of preparation method of silica gel crisper.
For realizing the foregoing invention purpose, the present invention adopts following technical scheme:
A kind of crisper, the material of said crisper are the silica gel after post cure; Said silica gel is food grade silica gel, and composition is a polydimethyl siloxanes;
The absorption peak at the infrared spectrogram absorption spectrum peak of said crisper is: 403.05cm
-1, 667.25cm
-1, 802.24cm
-1, 1025.94cm
-1, 1097.30cm
-1, 1263.15cm
-1, 1384.64cm
-1, 1633.41cm
-1, 2362.37cm
-1, 2927.41cm
-1, 2964.05cm
-1, 3465.46cm
-1
Because existing food grade silica gel material hardness ratio is relatively poor; So general all can not directly it be used for making splendid attire vessel such as crisper; In the present invention through after silica gel material is carried out post cure; Its hardness has obtained very big improvement, and the absorption peak energy at the infrared spectrogram absorption spectrum peak of the silica gel material after the process post cure is measured through Fourier transformation infrared spectrometer and obtained.
Preferably, the shore hardness of said crisper is 85 ~ 93.
Preferably, the elongation at break of said crisper is 40 ~ 45%.
Preferably, the tensile strength of said crisper is 6 ~ 8 MPas.
The preparation method of described crisper may further comprise the steps:
Step 1: raw material silica gel is put into rubber mixing machine, and it is female to add bridging agent and look then, mixing 30 minutes;
Step 2: the material that mixes is put into sulfuration, molding in the vulcanizing press;
Step 3: the crisper model of step 2 gained is put into baking box carry out post cure, can obtain said crisper;
The adding proportion of said bridging agent is 0.3 ~ 3% of a silica gel weight; Look female adding proportion is 0.2 ~ 2% of a silica gel weight.
Preferably, the adding proportion of said bridging agent is 0.3 ~ 2% of a silica gel weight; Look female adding proportion is 0.2 ~ 1.5% of a silica gel weight; Preferred, the adding proportion of said bridging agent is 0.3 ~ 1.5% of a silica gel weight; Look female adding proportion is 0.2 ~ 1% of a silica gel weight.
Preferably, the curing temperature described in the step 2 is 180 ~ 240 ℃, and molding pressure is 150 ~ 200kg/cm
2, curing time is 800 seconds-1500 seconds.
Preferably, the curing temperature described in the step 3 is 200 ℃, and curing time is 3 ~ 4 hours.
Preferably, crisper also comprises the deburring step through after the post cure.
Beneficial effect of the present invention:
(1), crisper material of the present invention adopts is the food grade silica gel material of safety and environmental protection, heat resisting temperature-40 ~ 230 ℃ can not discharge any objectionable impurities when being used in baking box, microwave oven, heat.
(2), in the making processes of crisper to silica gel material once vulcanize respectively, post cure; Increased the hardness of silica gel; The hardness of general silica gel can only reach 80 (shore hardnesses); And the hardness of the silica gel after post cure can reach 85 ~ 93 (shore hardnesses) among the present invention, the soft shortcoming that can not make the splendid attire vessel before having solved.
Description of drawings
Fig. 1 is the fourier transform infrared spectrogram of crisper of the present invention;
Fig. 2 is the total ion chromatogram of crisper of the present invention;
Fig. 3-6 is the split product figure of crisper of the present invention;
Fig. 7 is the DSC&TAG figure of crisper of the present invention.
Embodiment
The composition of silica gel material is mainly polydimethyl siloxanes among the present invention.
Silica gel crisper of the present invention, the food grade silica gel material of environmental protection safe in utilization.Silica gel shore hardness after handling through post cure in the present invention reaches 85 ~ 93, and silica gel after treatment can be used for making crisper.
So-called post vulcanization is named postcure again.Be usually used in Zylox, viton and trifluoropropyl siloxane sulfuration (like vulcanizing agent BIPB).Post cure can be used for replenishing sulfuration, decides as required, might not be directed against some kind.Only must carry out post cure usually like Zylox.
Because when Zylox adopts peroxide vuleanization, after peroxide breakdown causes polymer reaction, generated low molecular compound (like benzene and phenylformic acid etc.) and be present in the rubber and will influence the rubber manufacturing machinery performance.Moreover Zylox is after the fs hot briquetting, and its cross-linking density is not enough, make its further reaction, and necessary increase time or elevated temperature, influence efficient at the time that this has just taken mould and vulcanizer.In the post vulcanization, superoxide mainly is to lean on oxygen effect increase crosslinked in fact seldom.Post vulcanization can be removed has niff and volatile matter in the rubber; And make product hardness reach required peak value; Make it can reach each item requirement that environmental protection food is used, rubber item more can be useful in any severe environment, prevent to produce DeR.
Bridging agent; Also claim linking agent; Formal name used at school is dead front type waterborne curing agent or non-ionic type linking agent, thereby can make the mutual bonding cross-linking of a plurality of thread-like molecules become the material of network structure at intermolecular bridging action of line style, promote or the telomerized polymer molecular chain between the material that forms of covalent linkage or ionic linkage.Bridging agent also is a kind of vulcanizing agent with the yellow effect of excellent anti in fact, can prevent effectively that secondary from adding sulphur or the long-time xanthochromia problem of bringing that stores, and is applicable to high-quality silica gel product.Its outward appearance is transparent paste, and the composition of the bridging agent among the present invention comprises: (1) 2,5-dimethyl--2,5 di-t-butyl peroxy hexane (2) silicon virgin rubber (3), silica gel is with anti-yellow agent.
Look female full name also is the look kind Masterbatch, and the look mother mainly is used on the plastic cement, to reach in plastics or sizing material goods reaching what color effects.
Employed rubber mixing machine is an opening rubber mixing machine among the present invention.
Dsc (DSC) is one of most widely used thermoanalysis technology.The mechanical property of plastics and elastomeric material and its thermal properties in practical application--second-order transition temperature (Tg), melt temperature (Tm), Tc (Tc), specific heat (Cp) and heat enthalpy value etc. have certain relation.Oxidation induction period test (O.I.T) can provide the information of the oxidation behavior and the additive to affect of material.High Pressure DSC can further provide the influence of pressure to oxidizing reaction, crosslinking reaction and crystallization behavior.The shape of melting peak can provide the information of grain size distribution on the DSC curve; Melting enthalpy has provided the information of percent crystallinity; Many hemicrystalline thermoplastic materials all have the cold crystallization peak of a heat release in temperature limit before melt temperature, the contraction that causes thus can influence the use of material.Can also obtain the influence of impurity and humidity with DSC.In program control cooling, can obtain the influence of material Tc, crystallization rate and nucleator and salvage material.Heating curve can provide the influence of material processing technique and preparation condition for the second time.
Thermogravimetric analyzer (TGA) thermogravimetry: sample is under programme controlled temperature, and the quality of observation sample is with the function of temperature or time.Be widely used in research and development, process optimization and the quality monitoring in each field such as plastics, rubber, coating, medicine, catalyzer, inorganic materials, metallic substance and matrix material.
From DSC&TGA figure of the present invention, can find out that crisper of the present invention does not have Tc.
(the FTIR test: the FTIR technology can be used for detecting various chemical molecular to the fourier transform infrared spectrum, and has quite high resolution for the different sorts chemical substance that occurs simultaneously.
Fourier transformation infrared spectrometer is called as third generation IR, utilizes michelson interferometer that the two-beam path difference is interfered by the secondary color infrared light that certain speed changes each other, forms interference light, again with sample effect.Detector is sent to computingmachine with the interference signal that obtains and carries out the mathematics manipulation that fourier changes, and is reduced into spectrogram to interferogram.Ir spectra can be studied the structure and the chemical bond of molecule, like the mensuration of force constant and molecular syrrmetry etc., utilizes method of infrared spectrophotometry can measure the bond distance and the bond angle of molecule, and infers the steric configuration of molecule thus.Can know the power of chemical bond by inference according to the force constant of gained, calculate thermodynamic(al)function etc. by normal frequency.Some group in the molecule or chemical bond pairing bands of a spectrum wave number in different compounds is fixed basically or only in the small band scope, changes; Therefore for example methyl, methylene radical, carbonyl of many organo-functional groups, cyanic acid, hydroxyl; Amido or the like all has characteristic absorbance in ir spectra; Through infrared measurement, people just can judge there is which organo-functional group in the unknown sample, and this chemical structure for final definite unknown material is laid a good foundation.
Total ion chromatogram, promptly the population of ions of the various mass-to-charge ratioes that record of chromatography mass spectrometry with and time dependent curve.Constantly get into mass spectrum through the effusive component of chromatographic separation, data gathering is carried out in mass spectrum continuous sweep, and scanning each time obtains a mass spectrum, with all ionic strength additions in each mass spectrum, obtains a total ionic current intensity.Be ordinate zou then with the ionic strength, the time is that the figure that X-coordinate is drawn is a total ion chromatogram.
Below in conjunction with embodiment the present invention is done to explain further and explanation that following examples do not constitute any limitation the present invention.
Embodiment 1:
(1), make the silica gel crisper:
Step 1: silica gel is put into opening rubber mixing machine, by adding 0.3-3% bridging agent and 0.2-2% look female then, mixing 30 minutes;
Step 2: the material that mixes is put in the vulcanizing press, at 200 ℃, 180KG/cm
2Under make the crisper model;
Step 3: the crisper model of step 2 gained is put into baking box carry out post cure, 200 ℃ of following postcure 4 hours;
Step 4:, can obtain said crisper to carrying out deburring through the crisper model after the post cure.
(2), measure correlation parameter
Crisper to embodiment 1 preparation gained carries out hardness, elongation at break, stretching strength determination:
Recording the crisper shore hardness through Shore durometer is 89.
Recording the crisper elongation at break through the elongation at break detector is 42%.
Recording the crisper tensile strength through the tensile strength detector is 7 MPas.
According to the announcement and the instruction of above-mentioned specification sheets, those skilled in the art in the invention can also change and revise above-mentioned embodiment.Therefore, the embodiment that discloses and describe above the present invention is not limited to also should fall in the protection domain of claim of the present invention modifications more of the present invention and change.In addition, although used some specific terms in this specification sheets, these terms are explanation for ease just, the present invention is not constituted any restriction.
Claims (10)
1. crisper is characterized in that: the material of said crisper is the silica gel after post cure; Said silica gel is food grade silica gel, and composition is a polydimethyl siloxanes;
The absorption peak at the infrared spectrogram absorption spectrum peak of said crisper is: 403.05cm
-1, 667.25cm
-1, 802.24cm
-1, 1025.94cm
-1, 1097.30cm
-1, 1263.15cm
-1, 1384.64cm
-1, 1633.41cm
-1, 2362.37cm
-1, 2927.41cm
-1, 2964.05cm
-1, 3465.46cm
-1
2. crisper according to claim 1 is characterized in that: the shore hardness of said crisper is 85 ~ 93.
3. crisper according to claim 1 is characterized in that: the elongation at break of said crisper is 40 ~ 45%.
4. crisper according to claim 1 is characterized in that: the tensile strength of said crisper is 6 ~ 8 MPas.
5. the preparation method of the described crisper of claim 1 is characterized in that, said method comprising the steps of:
Step 1: raw material silica gel is put into rubber mixing machine, and it is female to add bridging agent and look then, mixing 30 minutes;
Step 2: the material that mixes is put into sulfuration, molding in the vulcanizing press;
Step 3: the crisper model of step 2 gained is put into baking box carry out post cure, can obtain said crisper;
The adding proportion of said bridging agent is 0.3 ~ 3% of a silica gel weight; Look female adding proportion is 0.2 ~ 2% of a silica gel weight.
6. preparation method according to claim 5 is characterized in that: the adding proportion of said bridging agent is 0.3 ~ 2% of a silica gel weight; Look female adding proportion is 0.2 ~ 1.5% of a silica gel weight.
7. preparation method according to claim 5 is characterized in that: the adding proportion of said bridging agent is 0.3 ~ 1.5% of a silica gel weight; Look female adding proportion is 0.2 ~ 1% of a silica gel weight.
8. according to the arbitrary described preparation method of claim 5 ~ 7, it is characterized in that: the curing temperature described in the step 2 is 180 ~ 240 ℃, and molding pressure is 150 ~ 200kg/cm
2, curing time is 800 seconds-1500 seconds.
9. according to the arbitrary described preparation method of claim 5 ~ 7, it is characterized in that: the curing temperature described in the step 3 is 200 ℃, and curing time is 3 ~ 4 hours.
10. according to the arbitrary described preparation method of claim 5 ~ 7, it is characterized in that: crisper also comprises the deburring step through after the post cure.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101973540A CN102702749A (en) | 2012-06-14 | 2012-06-14 | Preserving box and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012101973540A CN102702749A (en) | 2012-06-14 | 2012-06-14 | Preserving box and preparation method thereof |
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| CN102702749A true CN102702749A (en) | 2012-10-03 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105881890A (en) * | 2015-10-22 | 2016-08-24 | 杭州富利登塑胶制品有限公司 | Method for fusing silica gel and thermoplastic resin |
| CN109096765A (en) * | 2018-07-17 | 2018-12-28 | 合肥东恒锐电子科技有限公司 | A kind of flexible hand casing NEW TYPE OF COMPOSITE silica gel |
| CN113002029A (en) * | 2021-01-29 | 2021-06-22 | 佛山道格科技有限公司 | Self-adhesive tableware and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101416837A (en) * | 2007-10-27 | 2009-04-29 | Sar控股国际有限公司 | Silicone Steamer |
-
2012
- 2012-06-14 CN CN2012101973540A patent/CN102702749A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101416837A (en) * | 2007-10-27 | 2009-04-29 | Sar控股国际有限公司 | Silicone Steamer |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105881890A (en) * | 2015-10-22 | 2016-08-24 | 杭州富利登塑胶制品有限公司 | Method for fusing silica gel and thermoplastic resin |
| CN109096765A (en) * | 2018-07-17 | 2018-12-28 | 合肥东恒锐电子科技有限公司 | A kind of flexible hand casing NEW TYPE OF COMPOSITE silica gel |
| CN113002029A (en) * | 2021-01-29 | 2021-06-22 | 佛山道格科技有限公司 | Self-adhesive tableware and preparation method thereof |
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Application publication date: 20121003 |