Defoaming composition

A defoaming composition, comprising a first composition and a second composition, wherein

• the first composition comprises a first hydrogen bond donor and a first hydrogen bond acceptor, wherein the first hydrogen bond donor is a polyether modified polysiloxane;
• the second composition comprises a second hydrogen bond donor and a second hydrogen bond acceptor, wherein the second hydrogen bond donor is a fatty alcohol polyether;
• the polyether modified polysiloxane comprises a polyorganosiloxane and an allyl polyether;
• a general structural formula of the polyorganosiloxane is:
• R02HSiO(Me2SiO)aSiHR02,
• wherein R0 is alkyl, cycloalkyl or aryl with 1-12 carbon atoms, and a is an integer between 10 and 100;
• a general structural formula of the allyl polyether is:
• CH2═CHCH2(OCH2CH2)b(OCH2CHCH3)cOH,
• wherein b is an integer between 1 and 10, and c is an integer between 10 and 100;
• a general structural formula of the fatty alcohol polyether is:
• R1(OCH2CH2)m(OCH2CHCH3)nOH,
• wherein R1 is linear or branched alkyl, cycloalkyl or aralkyl with 3-20 carbon atoms;
• m is an integer between 1 and 50;
• and n is an integer between 10 and 100;
• the first hydrogen bond acceptor and the second hydrogen bond acceptor are both selected from the group consisting of menthol, menthene, thymol, terpilenol, carveol and perillyl alcohol;
• and wherein
• the polyorganosiloxane accounts for 10-32% of a total mass of the defoaming composition;
• the allyl polyether accounts for 5-18% of the total mass of the defoaming composition;
• the fatty alcohol polyether accounts for 50-83% of the total mass of the defoaming composition;
• the first hydrogen bond acceptor accounts for 0.5-5% of the total mass of the defoaming composition;
• and
• the second hydrogen bond acceptor accounts for 0.5-5% of the total mass of the defoaming composition.