CN109136424A - A kind of no aldehyde leather agent and preparation method - Google Patents
A kind of no aldehyde leather agent and preparation method Download PDFInfo
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- CN109136424A CN109136424A CN201810916169.XA CN201810916169A CN109136424A CN 109136424 A CN109136424 A CN 109136424A CN 201810916169 A CN201810916169 A CN 201810916169A CN 109136424 A CN109136424 A CN 109136424A
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- China
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- dicyandiamide
- melamine
- leather
- methanol
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- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C3/00—Tanning; Compositions for tanning
- C14C3/02—Chemical tanning
- C14C3/08—Chemical tanning by organic agents
- C14C3/22—Chemical tanning by organic agents using polymerisation products
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
A kind of no aldehyde leather agent and preparation method, belong to leather modification technical field.It is characterized in that, parts by weight of raw materials forms are as follows: 20 ~ 40 parts of dicyandiamide, 35 ~ 65 parts of deionized water, 6 ~ 15 parts of melamine, 3 ~ 8 parts of methanol.Include the following steps: after deionized water to be warming up to 75 DEG C ~ 85 DEG C, dicyandiamide, melamine insulated and stirred 1.7 ~ 2.5 hours is added；Methanol is added, is condensed back 5 ~ 7 hours under the conditions of the high-speed stirred of the rpm of 1200rpm ~ 1400 at 75 DEG C ~ 85 DEG C；It is spray-dried after cooling to obtain the final product.The present invention is realized by process modification and prepares leather agent using a certain amount of dicyandiamide, melamine and methanol reaction.Because realizing the addition of zero formaldehyde in raw material, the resulting formaldehydeless release of leather agent.
Description
Technical field
A kind of no aldehyde leather agent and preparation method, belong to leather modification technical field.
Background technique
Melamine resin has different molecular weight distributions, being capable of different depths of infiltration in tanning in fibrinogen
Degree, the small component of molecular weight penetrate into the peptide interchain of collagenous fibres triple-helix structure, and with the variation of pH, autocondensation is certain at having
Sized molecules are condensed by NCH OH in its molecule and the active group on the amino or side chain on collagen peptide chain, are changed
Polypeptide interchain, the interfibrous degree of cross linking, the collagen of fracture is connected, and forms covalent cross-linking system.This crosslink density
It increases, makes leather that there is better toughness, and chromium can be effectively fixed, chrome tanning agent can be made to be difficult to fibrinogen of moving out, to make
Chrome tanning agent utilization rate increases, and guarantees that the humidity resistance of leather increases in post-processing；And resin tanning agent middle-molecular-weihydroxyethyl is larger
Component physical absorption mainly occurs between each secondary fiber more than supramolecular structure of collagen, be filled between fibrinogen.
The formaldehyde condensation products such as dicyandiamide, melamine, the urea of a kind of existing modifier modification.Except main component resins
Outside, also containing more than 10 inorganic components such as sodium, silicon, aluminium, magnesium, calcium.It is mainly used for chrome leather retanning filling, has stronger selection to fill out
Use use as.A kind of existing also technology is using chloroacetic acid, aniline, urea, dicyandiamide, melamine and formaldehyde as raw material system
For the New Amphoteric Amino-resin Retanning Agent suitable for leather retanning.Although these existing auxiliary agent raw materials are cheap and easy to get, system
It is standby at low cost, and finished leather pliability can be made good, grain ramuscule, strong coloring force；But formaldehyde can be released, lead to formaldehyde
The exceeded problem of content.And conventional leather auxiliary agent is liquid condition, due to the storage meeting for a long time of liquid product self reason
Rotten, mildew.
Summary of the invention
The technical problem to be solved by the present invention is overcoming the deficiencies of the prior art and provide a kind of storage of long-time will not become
Matter, formaldehydeless release without aldehyde leather agent and preparation method.
The technical solution adopted by the present invention to solve the technical problems is: this is without aldehyde leather agent, which is characterized in that raw material
Parts by weight composition are as follows: 20 ~ 40 parts of dicyandiamide, 35 ~ 65 parts of deionized water, 6 ~ 15 parts of melamine, 3 ~ 8 parts of methanol.
The addition of zero formaldehyde in raw material of the present invention, the resulting formaldehydeless release of leather agent.
Preferably, parts by weight of raw materials forms are as follows: and 26 ~ 34 parts of dicyandiamide, 45 ~ 55 parts of deionized water, 8 ~ 12 parts of melamine,
4 ~ 6 parts of methanol.Preferred parts by weight can guarantee that the effective component of product is more, more preferable to the treatment effect of leather, after processing
The plentiful resilient flexible of volume leather is good, and grain is careful, and pore is clear, and tinctorial strength is good, and light fastness is good.
It is furthermore preferred that parts by weight of raw materials forms are as follows: 30 parts of dicyandiamide, 50 parts of deionized water, 10 parts of melamine, methanol 5
Part.Preferred parts by weight are to reach the necessary condition of optimal effect of the invention.
A kind of preparation method of above-mentioned no aldehyde leather agent, which comprises the steps of:
1) after deionized water being warming up to 75 DEG C ~ 85 DEG C, dicyandiamide, melamine insulated and stirred 1.7 ~ 2.5 hours is added；
2) methanol is added, is condensed back 5 ~ 7 hours under the conditions of the high-speed stirred of the rpm of 1200rpm ~ 140 0 75 DEG C ~ 85；
3) it is spray-dried after cooling down to obtain the final product.
Preparation method of the invention is realized using a certain amount of dicyandiamide, melamine and methanol under given conditions
Reaction prepares leather agent.The addition of zero formaldehyde in raw material, the resulting formaldehydeless release of leather agent, treated, and leather is plentiful
Resilient flexible is good, and grain is careful, and pore is clear, and tinctorial strength is good, and light fastness is good.
Preferably, after deionized water being warming up to 78 DEG C ~ 82 DEG C described in step 1), dicyandiamide, melamine is added
Insulated and stirred 1.8 ~ 2.2 hours.Preferred dicyandiamide, the mixing temperature of melamine and time can make the two with uniformly mixing
It closes and reaches better methanol reactivity.
It is furthermore preferred that dicyandiamide, melamine heat preservation is added after deionized water is warming up to 80 DEG C described in step 1)
Stirring 2 hours.Preferred dicyandiamide, the mixing temperature of melamine and time can reach optimum efficiency of the invention.
Preferably, it is condensed back under the conditions of the high-speed stirred of 1300rpm ~ 1350rpm at 78 DEG C ~ 82 DEG C in step 2
5.7 ~ 6.3 hours.Preferred speed of agitator and reaction condition can guarantee that methanol and dicyandiamide, melamine sufficiently react, and produce
The effective component content of product is higher, and leather treatment effect is more preferable.
Preferably, cooling described in step 3) is to be cooled to 4 DEG C ~ 7 DEG C.It is first cooled to 4 DEG C ~ 7 DEG C before spray drying
Low temperature, can guarantee finished product longer time storage undergo no deterioration.
Compared with prior art, beneficial effect possessed by a kind of no aldehyde leather agent of the invention and preparation method is:
Preparation method of the invention, which is realized, replaces formaldehyde, the formaldehydeless release of product, content of formaldehyde test passes using methanol；Product synthesis
Dry by spray drying tower after complete, finished product can be stored for a long time and be undergone no deterioration.Treated, and the plentiful resilient flexible of leather is good, grain
Face is careful, and pore is clear, and tinctorial strength is good, and light fastness is good.
Specific embodiment
The present invention will be further described combined with specific embodiments below, and wherein embodiment 1 is best implements.Embodiment and
Dicyandiamide used in comparative example is Jinan Fleder Chemical Manufacture content 99%；Melamine used is the safe Chemical Manufacture of resultant force
Content be 99%；Methanol used is that the content of the emerging Shandong Chemical Manufacture in Zibo is 96%.
Embodiment 1
1) it stocks up by parts by weight of raw materials: 30 parts of dicyandiamide, 50 parts of deionized water, 10 parts of melamine, 5 parts of methanol；
2) after deionized water being warming up to 80 DEG C, dicyandiamide, melamine insulated and stirred 2 hours is added；
3) methanol is added, is condensed back 6 hours under the conditions of the high-speed stirred of 1350rpm at 80 DEG C；
4) it is spray-dried after being cooled to 6 DEG C to obtain the final product.
Embodiment 2
1) it stocks up by parts by weight of raw materials: 34 parts of dicyandiamide, 45 parts of deionized water, 8 parts of melamine, 6 parts of methanol；
2) after deionized water being warming up to 82 DEG C, dicyandiamide, melamine insulated and stirred 1.8 hours is added；
3) methanol is added, is condensed back 5.7 hours under the conditions of the high-speed stirred of 1350rpm at 82 DEG C；
4) it is spray-dried after being cooled to 5 DEG C to obtain the final product.
Embodiment 3
1) it stocks up by parts by weight of raw materials: 26 parts of dicyandiamide, 55 parts of deionized water, 12 parts of melamine, 4 parts of methanol；
2) after deionized water being warming up to 78 DEG C, dicyandiamide, melamine insulated and stirred 2.2 hours is added；
3) methanol is added, is condensed back 6.3 hours under the conditions of the high-speed stirred of 1300rpm at 78 DEG C；
4) it is spray-dried after being cooled to 4 DEG C to obtain the final product.
Embodiment 4
1) it stocks up by parts by weight of raw materials: 20 parts of dicyandiamide, 65 parts of deionized water, 15 parts of melamine, 3 parts of methanol；
2) after deionized water being warming up to 75 DEG C, dicyandiamide, melamine insulated and stirred 2.5 hours is added；
3) methanol is added, is condensed back 7 hours under the conditions of the high-speed stirred of 1200rpm at 75 DEG C；
4) it is spray-dried after being cooled to 7 DEG C to obtain the final product.
Embodiment 5
1) it stocks up by parts by weight of raw materials: 40 parts of dicyandiamide, 35 parts of deionized water, 6 parts of melamine, 8 parts of methanol；
2) after deionized water being warming up to 85 DEG C, dicyandiamide, melamine insulated and stirred 1.7 hours is added；
3) methanol is added, is condensed back 5 hours under the conditions of the high-speed stirred of 1400 rpm at 85 DEG C；
4) it is spray-dried after being cooled to 25 DEG C to obtain the final product.
Comparative example 1
The preparation method is the same as that of Example 1, the difference is that parts by weight of raw materials are as follows: and 20 parts of dicyandiamide, 50 parts of deionized water, melamine 20
Part, 5 parts of methanol.
Comparative example 2
Parts by weight of raw materials with embodiment 1, unlike in preparation method after deionized water is warming up to 85 DEG C, dicyandiamide, three
Poly cyanamid and methanol are added simultaneously.
Performance test, 1, content of formaldehyde detection method: ISO14184-1:2011, by embodiment and comparative example with similarly
After method processing is with the leather of batch, detection leather property can.
1 the performance test results of table
。
The above described is only a preferred embodiment of the present invention, being not that the invention has other forms of limitations, appoint
What those skilled in the art changed or be modified as possibly also with the technology contents of the disclosure above equivalent variations etc.
Imitate embodiment.But without departing from the technical solutions of the present invention, according to the technical essence of the invention to above embodiments institute
Any simple modification, equivalent variations and the remodeling made, still fall within the protection scope of technical solution of the present invention.
Claims (8)
1. a kind of no aldehyde leather agent, which is characterized in that parts by weight of raw materials composition are as follows: 20 ~ 40 parts of dicyandiamide, deionized water 35 ~
65 parts, 6 ~ 15 parts of melamine, 3 ~ 8 parts of methanol.
2. a kind of no aldehyde leather agent according to claim 1, it is characterised in that: parts by weight of raw materials composition are as follows: dicyandiamide
26 ~ 34 parts, 45 ~ 55 parts of deionized water, 8 ~ 12 parts of melamine, 4 ~ 6 parts of methanol.
3. a kind of no aldehyde leather agent according to claim 1, it is characterised in that: parts by weight of raw materials composition are as follows: dicyandiamide
30 parts, 50 parts of deionized water, 10 parts of melamine, 5 parts of methanol.
4. a kind of preparation method of the described in any item no aldehyde leather agents of claim 1 ~ 3, which is characterized in that including walking as follows
It is rapid:
1) after deionized water being warming up to 75 DEG C ~ 85 DEG C, dicyandiamide, melamine insulated and stirred 1.7 ~ 2.5 hours is added；
2) methanol is added, is condensed back 5 ~ 7 hours under the conditions of the high-speed stirred of the rpm of 1200rpm ~ 1400 at 75 DEG C ~ 85 DEG C；
3) it is spray-dried after cooling down to obtain the final product.
5. a kind of preparation method of no aldehyde leather agent according to claim 4, it is characterised in that: described in step 1)
After deionized water is warming up to 78 DEG C ~ 82 DEG C, dicyandiamide, melamine insulated and stirred 1.8 ~ 2.2 hours is added.
6. a kind of preparation method of no aldehyde leather agent according to claim 4, it is characterised in that: described in step 1)
After deionized water is warming up to 80 DEG C, dicyandiamide, melamine insulated and stirred 2 hours is added.
7. a kind of preparation method of no aldehyde leather agent according to claim 4, it is characterised in that: in step 2
It is condensed back 5.7 ~ 6.3 hours under the conditions of the high-speed stirred of 1300rpm ~ 1350rpm at 78 DEG C ~ 82 DEG C.
8. a kind of preparation method of no aldehyde leather agent according to claim 4, it is characterised in that: described in step 3)
Cooling is to be cooled to 4 DEG C ~ 7 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810916169.XA CN109136424A (en) | 2018-08-13 | 2018-08-13 | A kind of no aldehyde leather agent and preparation method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810916169.XA CN109136424A (en) | 2018-08-13 | 2018-08-13 | A kind of no aldehyde leather agent and preparation method |
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| Publication Number | Publication Date |
|---|---|
| CN109136424A true CN109136424A (en) | 2019-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201810916169.XA Pending CN109136424A (en) | 2018-08-13 | 2018-08-13 | A kind of no aldehyde leather agent and preparation method |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1687463A (en) * | 2005-06-02 | 2005-10-26 | 四川大学 | Leather tanning agent of modified aminoresin and preparation method thereof |
| CN102797170A (en) * | 2012-09-06 | 2012-11-28 | 苏州联胜化学有限公司 | Formaldehyde-free fixing agent and preparation method thereof |
-
2018
- 2018-08-13 CN CN201810916169.XA patent/CN109136424A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1687463A (en) * | 2005-06-02 | 2005-10-26 | 四川大学 | Leather tanning agent of modified aminoresin and preparation method thereof |
| CN102797170A (en) * | 2012-09-06 | 2012-11-28 | 苏州联胜化学有限公司 | Formaldehyde-free fixing agent and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 李立新: "新型改性氨基树脂鞣剂的合成工艺", 《中国皮革》 * |
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Application publication date: 20190104 |