Detailed Explanation of The Reaction Mechanism And Production Process of Polyether Polyol3

Polyether polyol production process

Firstly, the polyether polyol and polymer polyol are added into the reactor by hand or by using a dosing pump in proportion to the formulation. Under continuous stirring, then add silicone foam stabilizer, catalyst, foaming agent and other additives after precise measurement according to the design sequence, and then time stirring and mixing (it is better to reflux without interruption during mixing) When the specified time is reached, stop reflux and stirring, and take samples to analyze the relevant indexes. After qualified, the product is divided, printed and marked, and stored in the warehouse.

Cautions

1, the order of adding material is a key step in the combination of material and and production process, the mixing time, mixing uniformity has a greater impact. If you add water first, because of the high surface tension of polyether, and the poor compatibility of water and water and polyether in the active group of hydroxyl groups form a strong hydrogen bond, so it is not easy to mix uniformly, it is recommended to use the following order of addition: foam stabilizer - catalyst - cross-linking agent - blowing agent - porous agent, etc.. Never add blowing agent to polyether under static condition first, otherwise it will form more gel (due to hydrogen bonding), which is not easy to mix evenly.

2、Under certain conditions, the dispersion of additives in polyether is a function of the mixing time. Theoretically, the longer the mixing time, the more uniform the mixture will be and the better the stability. Take 1000L reactor as an example, in the correct way of dosing, the material is mixed for 90min to achieve satisfactory results.

Related calculations

The following formulation is used as an example to introduce the calculation of isocyanate dosage related to HR foam production.

1、The basic formula of foam is as follows:

Highly reactive polyether polyol（M＝5000）：60/Triethanolamine：2

Polymer polyol（M＝6000）：40/A-33：0.4

Foam stabilizer: 1/A/1: 0.15

Water：2.6/TDI/ crude MDI：80/20

Diethanolamine：1/INDEX：103

2, the amount of T / M = the sum of the active hydrogen compound equivalents × mixed isocyanate equivalents × index

Because TD1 equivalent is 87, crude MDI equivalent is 127, then the mixed isocyanate equivalent is 1 ÷ (0.8 / 87 + 0.2 / 127) = 93

The equivalents of each active hydrogen compound are as follows

Highly reactive polyether: 60 ÷ (5000 / 3) = 0.036

Polymer polyether: 40 ÷ (6000 / 3) = 0.02

Water: 2.6÷(18/2)=0.289

Diethanolamine: 1÷(105/3)=0.029

Triethanolamine: 2 ÷ (149 / 3) = 0.040

Then the amount of T / M = 0.414 × 93 × 1.03 = 39.7

3, A material (white material) and B material (black material) ratio:

The total amount of combined polyether polyol components is 107.15, while the mixed isoxylate is 39.7, then A:B = 100:37

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