2. Which of the following is not a natural adhesive: (a) soybean (b) shellac (c)asphalt (d) UF resin
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Answer:
asphalt is a mixture of sand, aggregate,and bitumen.in asphalt, bitumen is used as a binder to hold together the asphalt, therefore asphalt is a concrete mixture whereas bitumen is binder or cement for pavement
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Answer:
(c) Asphalt is not a natural adhesive among the given options.
Explanation:
- The adhesives made using organic sources namely, vegetable starch, resins obtained from plants, animal-based proteins are known as 'natural adhesives'.
- Soybean adhesives are made up of soy flour and characteristic crosslinking resin. Therefore, it is considered a natural resource.
- Shellac is obtained from a product termed gum lac which is in turn obtained from the secretions of an insect (Kerria lacca ) female.
- Asphalt often referred to as bitumen, is not a natural adhesive since it is a semi-solid form of petroleum.
- Urea-formaldehyde resin is obtained from any class of synthetic resins, which are built using natural polymers, combined with urea and formaldehyde.
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