SU950741A1 - Binder and antipyrene for molded wood slabs - Google Patents

Description

(54) CONNECTING-ANTI-TYPE FOR WOOD PLATES

The invention relates to the production of phosphate binders with a multi-purpose purpose - simultaneously playing the role of a binder and a flame retardant, an antiseptic and a hydrophobic additive that can be used in the manufacture of fire-protected wood-based panels.

A binder is known - a fire retardant for wood-based panels, including hydrated oxides, phosphorus, aluminum, and chromium C.

The disadvantages of such a binder are the instability and low viability of the working solutions during storage, as well as low chemical activity at high jean temperatures.

A binder is known - a fire retardant for wood feeds, including stratified oxides of phosphorus, aluminum and chromium 2.

The disadvantages of this binder are also instability and low viability of its working solutions under storage conditions, long periods of curing and low chemical activity with respect to wood during hot pressing.

in the manufacture of plates, leading to a decrease in the productivity of production, physicomechanical and fire-resistant indicators of the plates, as well as to a violation of the technological regime due to the blockage of communication and reinforcement. Such a binder contains a large amount of expensive metal oxides, which increases the cost of the binder; in addition, its high content increases its toxicity.

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The purpose of the invention is to increase the viability and shorten the curing time of the binder, increasing the fire and waterproof properties of the slabs based on it.

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The goal is achieved by the fact that the molar ratio of phosphorus oxide to the sum of aluminum oxides and chromium is taken to be 3.56, 0 in the following ratio of components in the binder, wt.%:

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Phosphorus oxide 34.6-38.2

Alumina 3.25-4.55

Chromium oxide1.5-3.85

Water Else 395 PRI m e p. In the reactor, 87% orthophosphoric acid is heated to 80 ° C. With continuous mixing, 48% aqueous alumina hydrate paste is added to the reactor. Then FOS is introduced and stirring is continued for 30 minutes. After the dissolution is completed, it is reduced to 30% hydrogen peroxide solution. The end of the reaction corresponds to the cessation of foaming. Varying the amount of loaded metal salts, various binder compositions are obtained. The composition of the binders and their characteristics are given in Table. 1. The phosphate binder thus obtained is cooled and a 40% aqueous solution of urea is added with constant stirring. Stirring is carried out for 5 - 101 p / SH. The ground wood particles, such as wood fiber, are treated with a fire retardant binder obtained with a fire retardant, and plate materials are obtained by hot pressing. Characteristics of the binder - antipyre) and plates based on them are given in Table. 2. In this way, the curing time of the bonding SCREAM - flame retardants is significantly reduced, the duration is reduced accordingly.

Binder

Known

2 3-57-8,536-39

Proposed

12,54,55

23,852.25

31,52,5

Table 1

2.5-3.0

2.3-3.0

2.5

58,353,5

0.87

58.095.2

35.81

3.46

57.86.0 pressed plates produced on its basis. The viability of this binder, a flame retardant, is 4 times higher than the known. Physicomechanical and fire-resistant properties of wood-based panels obtained on its basis are higher than For plates produced on the basis of a known binder. In addition, reducing the content of metal oxides in the binder - a flame retardant allows you to reduce the cost of the binder and products based on it by 7-8%. Based on the above binders, plates are obtained without the addition of special reinforcing additives — organic resins, which makes it possible to significantly simplify their production technology. The plates obtained on the basis of the proposed binder are non-toxic, and they are also resistant. In terms of flame retardant properties, such slabs are classified as labor-combustible materials and have been expanded to be used as finishing and construction materials in public and civil construction. Economic effect for a chipboard workshop with a capacity of I million square meters m. 1 million 946 thousand 5 (Yu rub,

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Claims (2)

-fS Claim Binder-Fire retardant for wood-based panels, including hydrated oxides of aluminum and chromium phosphorus ,. I t it is because, in order to increase the viability and shorten the curing time of the binder, The fire and water resistant properties of slabs based on it, the molar ratio of phosphorus oxide to the sum of aluminum oxides and chromium is equal to 3.5-6.0 with the following ratio of components in the binder wt.%; . Phosphorus oxide 34.6-38.2 Alumina 2.25-4.55 Chromium oxide 1.5-3.85 Water Else Sources w {formats | w taken into account during the examination 1. USSR author's certificate If 601179, cl. In 29 J 5/00, 1976. 2. Chrome-aluminum acidic phosphate technical. TU 6-18-166-73, State Committee of Standards of the USSR Council of Ministers, state registration number 109516, 1973.