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Sự khác biệt giữa HEMA và di-HEMA là gì?

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Sự khác biệt giữa HEMA và di-HEMA là gì?
Well, their only similarity is that they are both monome, and both are used in acrylate-based lớp phủ móng tay.

They have a very different molecular kết cấu, with di-HEMA being considerably larger than HEMA.

HEMA is hydroxyethyl methacrylate

di- HEMA is Trimethylhexyl Dicarbamate

HEMA is a known high-level chất gây dị ứng.
Tất cả acrylat are allergens, but di-HEMA is considerably less so. This is almost certainly due to its molecular size and less ability to penetrate the skin.

They are both safe to use if used correctly, by a qualified thợ làm móng chuyên nghiệp, and in appropriate percentages.

They have both been banned in the UK and EU for RETAIL products. This is due to the high possibility of HEMA causing an phản ứng dị ứng when used incorrectly. It would appear that di-HEMA has also been banned, purely due to the perceived connection to HEMA.

Any nail product with these ingredients must be “For Professional Use Only”.

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quaMarian Newman, BEM
Bằng cấp chuyên nghiệp NailKnowledge
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\n

Hydroxyethyl methacrylate\u00a0(HEMA) - this is a commonly used monomer in many nail products (and many others). It is a known allergen but relatively safe at or below the recommended percentage (35%). It is mostly concerned with adhesion but products with known allergen ingredients must be used correctly and safely i.e no contact with the skin and properly cured. Developing an allergy to this, as well as to several other monomers, has other implications as they are used in dental and\u00a0orthopaedic procedures.\u00a0Anyone who develops an allergy is strongly\u00a0recommended to have a\u00a0dermatological test to discover which ingredients they are allergic to. Then, this ingredient\/s must be avoided for life, and their dentist and orthopaedic\u00a0consultant should be notified.<\/p>\n<\/div>","cmtt_f00b3885820d8ff0625113ec4f5b0c80":"

Nail professional<\/div>
\n

An individual who is qualified to provide a wide range of nail services.<\/p>\n<\/div>","cmtt_9810530dfe3b860d7dc2956c9d8df50e":"

Allergic reaction<\/div>
\n

This is the reaction of the body to an invasion of a chemical substance or allergen that could be harmful or that the body has developed a sensitivity to. <\/p>\n<\/div>","cmtt_db63a8e31d3136269cc7f9c771785a9b":"

Nail coatings<\/div>
\n

Any product used to coat a finger or toe nail for strength or to add length and\/or colour.<\/p>\n<\/div>","cmtt_7832b6d0cbb314b3fc615320b0c14059":"

Acrylates<\/div>
A family of chemicals that easily form plastic polymers. Commonly used in UV cured nail products.<\/div>","cmtt_df05eb08db9e67ae0ee501e6714c6584":"
Monomers<\/div>
\n

Single units of molecules \u2013 the building blocks of polymers and the polymerisation process. <\/p>\n<\/div>","cmtt_feb4cb65d40ddf76f9b89f3b1d869a93":"

Structure<\/div>
\n

In the context of 'nails', the structure is the creation of an overlay or an enhancement that provides the strongest 'structure' that depends on the length, shape, and aesthetic.<\/p>\n<\/div>","cmtt_bd83f8bc129a83a80cbb2ce4439b3a5d":"

Allergen<\/div>
What is an AllergenA chemical that mobilises the immune system in the human body as it is a threat to the health of the body. Individuals have different levels of when a chemical becomes an allergen.<\/div>"}}; -->