阅读说明：本技术 二维取向连续玻璃纤维增强硬质聚氨酯泡沫塑料及其制备方法 (Two-dimensional orientation continuous glass fiber reinforced hard polyurethane foam plastic and preparation method thereof ) 是由 王利群 王红军 夏森权 夏燕 于 2021-08-20 设计创作，主要内容包括：本发明公开了一种二维取向连续玻璃纤维增强硬质聚氨酯泡沫塑料,所述玻璃纤维增强硬质聚氨酯泡沫塑料中的玻璃纤维在垂直于聚氨酯泡沫发泡上升方向为连续的二维取向均匀分布。其中,玻璃纤维为单层或多层。含单层玻璃纤维的增强聚氨酯泡沫材料中,不含玻璃纤维层的厚度必须小于或等于泡沫材料总厚度的0.25；多层玻璃纤维的增强聚氨酯泡沫材料中,不含玻璃纤维层的总厚度必须小于或等于泡沫材料总厚度的0.25。通过二维取向的连续玻璃纤维的均匀分布,得到增强的硬质聚氨酯泡沫塑料改善了硬质聚氨酯泡沫塑料的各向异性,同时使硬质聚氨酯泡沫塑料具有高压缩强度,尤其是高弯曲和剪切强度。(The invention discloses a two-dimensional orientation continuous glass fiber reinforced rigid polyurethane foam plastic, wherein glass fibers in the glass fiber reinforced rigid polyurethane foam plastic are continuously and uniformly distributed in a two-dimensional orientation mode in a direction perpendicular to a foaming rising direction of polyurethane foam. Wherein, the glass fiber is single-layer or multi-layer. In the reinforced polyurethane foam material containing a single layer of glass fibers, the thickness of the layer containing no glass fibers must be less than or equal to 0.25 of the total thickness of the foam material; in a multiple layer glass fiber reinforced polyurethane foam, the total thickness of the layers without glass fibers must be less than or equal to 0.25 of the total thickness of the foam. The resulting reinforced rigid polyurethane foam improves the anisotropy of the rigid polyurethane foam by the uniform distribution of the two-dimensionally oriented continuous glass fibers, while providing the rigid polyurethane foam with high compressive strength, particularly high flexural and shear strength.)

1. A two-dimensional orientation continuous glass fiber reinforced hard polyurethane foam plastic is characterized in that: the glass fiber in the glass fiber reinforced hard polyurethane foam plastic is continuously and uniformly distributed in two-dimensional orientation in the direction vertical to the foaming rising direction of the polyurethane foam. Wherein, the glass fiber is single-layer or multi-layer.

2. A two-dimensionally oriented continuous glass fiber reinforced rigid polyurethane foam according to claim 1, wherein: in the single-layer glass fiber reinforced polyurethane foam material and the multi-layer glass fiber reinforced polyurethane foam material, the proportion of the polyurethane foam material-containing layer and the glass fiber layer to the polyurethane foam material-containing layer only respectively satisfies the following formula (1) and formula (2):

v_i≤0.25×(m_i+v_i) (1)

Σv_i≤0.25×Σ(m_i+v_i) (2)

in the formula, v_iIs the thickness of the polyurethane foam layer only; m is_iIs the thickness of both the polyurethane foam and the fiberglass layer; i is the ith layer and is 1, 2, 3, … … n respectively, and n is the total number of layers.

3. A two-dimensionally oriented continuous glass fiber reinforced rigid polyurethane foam according to claim 1, wherein: the preparation of the glass fiber reinforced hard polyurethane foam plastic can adopt a mode of die casting for intermittent preparation and also can adopt a continuous production line for continuous preparation.

4. A two-dimensionally oriented continuous glass fiber reinforced rigid polyurethane foam according to claim 1, wherein: the glass fiber used in the glass fiber reinforced hard polyurethane foam plastic is single-layer or multi-layer continuous glass fiber felt, wherein the multi-layer glass fiber is realized by simply superposing single-layer glass fiber.

5. A method for preparing a two-dimensionally oriented continuous glass fiber reinforced rigid polyurethane foam according to any one of claims 1 to 4, comprising the following steps:

(1) uniformly mixing polyols with different hydroxyl values; the polyester polyol comprises a mixture of 40-55 parts by weight of polyether polyol and polyester polyol; the mixing proportion is adjusted according to the performance requirements of the materials;

(2) adding a foaming agent, a catalyst, a foam stabilizer and a flame retardant into the mixture obtained in the step 1), and uniformly mixing; wherein, the weight portion of the catalyst is 1 to 3, the weight portion of the foam stabilizer is 1 to 3, the weight portion of the foaming agent is 1 to 15, and the weight portion of the flame retardant is 5 to 15;

(3) adding the mixture obtained in the step 2) into a polyol storage tank of a polyurethane foaming machine, and adding isocyanate into an isocyanate storage tank of the polyurethane foaming machine; 43-50 parts of isocyanate;

(4) uniformly spreading a single-layer or multi-layer continuous glass fiber mat on a lower-layer track of a double-layer track type foaming production line by a mat spreading device;

(5) simultaneously, uniformly mixing the mixture in the polyol storage tank and the isocyanate in the isocyanate storage tank, and continuously pouring the mixture onto the single-layer or multi-layer continuous glass fiber mat obtained in the step 4);

(6) and controlling the advancing speed of the track line to ensure that the speed of the foaming slurry penetrating into the glass fiber layer is balanced with the foaming speed of the foam body. And foaming, growing and curing the polyurethane slurry between the double-layer tracks. And cooling the continuous glass fiber reinforced rigid polyurethane foam leaving the double-layer track line, and cutting the cooled continuous glass fiber reinforced rigid polyurethane foam into required sizes by a cutting machine to obtain the continuous glass fiber reinforced rigid polyurethane foam with two-dimensional orientation.

6. The method for preparing two-dimensionally oriented continuous glass fiber reinforced rigid polyurethane foam according to claim 5, wherein the preparation process can also adopt batch preparation, a metal mold is adopted to replace a double-layer crawler-type foaming production line, a single-layer or multi-layer continuous glass fiber mat is uniformly spread in the metal mold, the mixture in the polyol storage tank and the isocyanate in the isocyanate storage tank are poured and mixed uniformly, and after the foam is reacted, the continuous glass fiber reinforced rigid polyurethane foam with two-dimensional orientation can be obtained by demolding.

Technical Field

The invention relates to the field of polyurethane foam, in particular to two-dimensional oriented continuous glass fiber reinforced rigid polyurethane foam and a preparation method thereof.

Background

Liquefied Natural Gas (LNG) is a liquid fuel obtained by cooling gaseous natural gas under pressure or to-163 ℃. The transportation of large amounts of LNG has to be done by large LNG ships. In order to ensure safe and effective transportation of LNG, large LNG carriers need to use thermal insulation materials to perform thermal insulation of the cargo holds. Among them, the polymer foam is one of important heat insulating materials, and the polyurethane foam is the first choice. To ensure the safety of transportation, glass fiber reinforced polyurethane foams are a common method in this field.

Many documents and patents are available on the method of reinforcing the strength of polyurethane foam using glass fiber. The properties of rigid polyurethane foams reinforced with glass fibers are described in general terms by Zhu Lvmin et al (Vermilion: polyurethane foams, third edition). Chinese patent 200610128243.9 provides a fiber reinforced modification method of polyurethane foam, which is to uniformly mix the components of polyurethane, spray the mixture on the surface of reinforced fiber at a high speed, soak the mixture uniformly, and then foam, cure and mold the mixture in a mold or a mold cavity. Chinese patent 200710144139.3 teaches a method for preparing continuous fiber reinforced polyurethane foam material, which comprises mixing and impregnating fibers with a mixture discharged from a high-speed casting head through an impregnation device, and then foaming and curing the mixture in a foaming mold.

The invention provides a preparation method of a glass fiber reinforced polyurethane foam material with continuous glass fibers in two-dimensional orientation distribution in polyurethane foam plastic, which can further improve the transverse tensile strength and the bending strength of the foam material on the basis of ensuring the longitudinal performance of the material, thereby meeting the performance requirements of large LNG transport ships on heat insulation materials of cargo holds.

Disclosure of Invention

The invention aims to provide a glass fiber reinforced rigid polyurethane foam plastic for a large liquefied natural gas carrier and a preparation method thereof aiming at the defects of the prior art, so that continuous glass fibers are distributed in two-dimensional orientation in the polyurethane foam plastic, the transverse tensile strength and the bending strength of the foam material are further improved on the basis of ensuring the longitudinal performance of the polyurethane foam material, and the performance requirements of the large LNG carrier on the heat insulation material of a cargo hold are met.

The purpose of the invention is realized by the following technical scheme: a two-dimensional orientation continuous glass fiber reinforced rigid polyurethane foam plastic is provided, wherein the glass fiber in the glass fiber reinforced rigid polyurethane foam plastic is continuously and uniformly distributed in two-dimensional orientation in the direction vertical to the foaming rising direction of the polyurethane foam plastic. Wherein, the glass fiber is single-layer or multi-layer.

Further, in the single-layer glass fiber-containing reinforced polyurethane foam material and the multiple-layer glass fiber-containing reinforced polyurethane foam material, the proportions of the polyurethane-containing foam material and the glass fiber layer to the polyurethane-containing foam material layer alone satisfy the following formulas (1) and (2), respectively:

v_i≤0.25×(m_i+v_i) (1)

Σv_i≤0.25×Σ(m_i+v_i) (2)

in the formula, v_iIs the thickness of the polyurethane foam layer only; m is_iIs the thickness of both the polyurethane foam and the fiberglass layer; i is the ith layer and is 1, 2, 3, … … n respectively, and n is the total number of layers.

Further, the preparation of the glass fiber reinforced rigid polyurethane foam plastic can be carried out intermittently by adopting a mode of mould pouring, and can also be carried out continuously by adopting a continuous production line.

Further, the glass fiber used in the glass fiber reinforced rigid polyurethane foam is a single-layer or multi-layer continuous glass fiber mat, wherein the multi-layer glass fiber is realized by simply stacking single-layer glass fibers.

The invention also provides a preparation method of the two-dimensional orientation continuous glass fiber reinforced hard polyurethane foam plastic, which comprises the following steps:

(1) uniformly mixing polyols with different hydroxyl values; the polyester polyol comprises a mixture of 40-55 parts by weight of polyether polyol and polyester polyol; the mixing proportion is adjusted according to the performance requirements of the materials;

(2) adding a foaming agent, a catalyst, a foam stabilizer and a flame retardant into the mixture obtained in the step 1), and uniformly mixing; wherein, the weight portion of the catalyst is 1 to 3, the weight portion of the foam stabilizer is 1 to 3, the weight portion of the foaming agent is 1 to 15, and the weight portion of the flame retardant is 5 to 15;

(3) adding the mixture obtained in the step 2) into a polyol storage tank of a polyurethane foaming machine, and adding isocyanate into an isocyanate storage tank of the polyurethane foaming machine; 43-50 parts of isocyanate;

(4) uniformly spreading a single-layer or multi-layer continuous glass fiber mat on a lower-layer track of a double-layer track type foaming production line by a mat spreading device;

(5) simultaneously, uniformly mixing the mixture in the polyol storage tank and the isocyanate in the isocyanate storage tank, and continuously pouring the mixture onto the single-layer or multi-layer continuous glass fiber mat obtained in the step 4);

(6) and controlling the advancing speed of the track line to ensure that the speed of the foaming slurry penetrating into the glass fiber layer is balanced with the foaming speed of the foam body. And foaming, growing and curing the polyurethane slurry between the double-layer tracks. And cooling the continuous glass fiber reinforced rigid polyurethane foam leaving the double-layer track line, and cutting the cooled continuous glass fiber reinforced rigid polyurethane foam into required sizes by a cutting machine to obtain the continuous glass fiber reinforced rigid polyurethane foam with two-dimensional orientation.

Furthermore, the preparation process can also adopt an intermittent preparation method, a metal mould is adopted to replace a double-layer crawler-type foaming production line, a single-layer or multi-layer continuous glass fiber mat is uniformly spread in the metal mould, the mixture in the polyol storage tank and the isocyanate in the isocyanate storage tank which are uniformly mixed are poured, and after the foaming body is reacted, the continuous glass fiber reinforced rigid polyurethane foaming plastic with two-dimensional orientation can be obtained by demoulding.

The invention has the advantages that the reinforced rigid polyurethane foam obtained through the uniform distribution of the two-dimensional oriented continuous glass fibers improves the anisotropy of the rigid polyurethane foam, and simultaneously enables the rigid polyurethane foam to have high compressive strength, especially high bending and shearing strength. The comprehensive performance of the reinforced rigid polyurethane foam plastic prepared by the invention is obviously improved, so that the use requirements of large liquefied natural gas carrier warehouses on the ultralow temperature heat insulation material can be met. The safety of the liquefied natural gas ship in the transportation process is ensured, and meanwhile, the volatilization loss of the liquefied natural gas in the transportation process is reduced.

Drawings

FIG. 1 is a schematic structural view of a two-dimensionally oriented continuous glass fiber reinforced rigid polyurethane foam provided by the present invention;

Detailed Description

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

As shown in figure 1, the invention provides a two-dimensional orientation continuous glass fiber reinforced rigid polyurethane foam plastic, wherein glass fibers in the glass fiber reinforced rigid polyurethane foam plastic are continuously and uniformly distributed in a two-dimensional orientation mode in a direction perpendicular to a foaming rising direction of polyurethane foam. Wherein, the glass fiber is single-layer or multi-layer.

In the single-layer glass fiber reinforced polyurethane foam material and the multi-layer glass fiber reinforced polyurethane foam material, the proportion of the polyurethane foam material-containing layer and the glass fiber layer to the polyurethane foam material-containing layer only respectively satisfies the following formula (1) and formula (2):

v_i≤0.25×(m_i+v_i) (1)

Σv_i≤0.25×Σ(m_i+v_i) (2)

in the formula, v_iIs the thickness of the polyurethane foam layer only; m is_iIs the thickness of both the polyurethane foam and the fiberglass layer; i is the ith layer and is 1, 2, 3, … … n respectively, and n is the total number of layers.

That is, in the reinforced polyurethane foam containing a single layer of glass fibers, the thickness of the layer containing no glass fibers must be less than or equal to 0.25 of the total thickness of the foam; in a multiple layer glass fiber reinforced polyurethane foam, the total thickness of the layers without glass fibers must be less than or equal to 0.25 of the total thickness of the foam.

The preparation of the glass fiber reinforced hard polyurethane foam plastic can adopt a mode of die casting for intermittent preparation and also can adopt a continuous production line for continuous preparation.

The glass fiber used in the glass fiber reinforced hard polyurethane foam plastic is single-layer or multi-layer continuous glass fiber felt, wherein the multi-layer glass fiber is realized by simply superposing single-layer glass fiber.

The glass fiber reinforced hard polyurethane foam plastic comprises the following main raw materials: polyether polyol, polyester polyol and mixtures thereof, diphenylmethane diisocyanate, polymethylene polyphenyl polyisocyanate and mixtures thereof, catalysts, foaming agents, organosilicon surfactants and the like.

The invention proposes that the continuous glass fiber material used is a continuous glass fiber felt as the most suitable material. Continuous glass fiber reinforced rigid polyurethane foam materials with different fiber contents can be obtained through single-layer or multi-layer felting. The rigid polyurethane foam material mainly comprises the following components: polyols, diphenylmethane diisocyanate and polymethylene polyphenyl polyisocyanates and mixtures thereof, catalysts, blowing agents, silicone surfactants, and the like. Wherein the polyol is polyether polyol and/or polyester polyol, the foaming agent is at least one of water, hydrofluorocarbons and hydrocarbons, the water is a preferable foaming agent, the catalyst is an organic metal catalyst or a tertiary amine catalyst, the tertiary amine catalyst is preferable, the foam stabilizer is an organosilicon surfactant, the organosilicon surfactant is polysiloxane-oxyalkylene block copolymer, and the isocyanate is polymethylene polyphenyl polyisocyanate (PAPI). In order to meet the requirements of large LNG ships, flame retardants are added in the preparation of the rigid polyurethane foam materials. The flame retardant is halogenated phosphate flame retardant or phosphate flame retardant.

The invention also provides a preparation method of the continuous glass fiber reinforced rigid polyurethane foam plastic with two-dimensional orientation, which comprises two preparation methods, namely a batch preparation method and a continuous preparation method; the performances of the continuous glass fiber reinforced rigid polyurethane foam plastics with two-dimensional orientation prepared in a batch mode and a continuous mode are the same and consistent, the application conditions of products obtained by the two preparation methods are also the same, and only the preparation process methods are different and the productivity is different. The continuous preparation method has higher productivity.

The method for batch preparation of continuous glass fiber reinforced rigid polyurethane foam with two-dimensional orientation comprises the following steps:

1) uniformly mixing polyols with different hydroxyl values; the polyester polyol comprises a mixture of 40-55 parts by weight of polyether polyol and polyester polyol; the mixing proportion is adjusted according to the performance requirements of the materials;

2) adding a foaming agent, a catalyst, a foam stabilizer and a flame retardant into the mixture obtained in the step 1), and uniformly mixing; wherein, the weight portion of the catalyst is 1 to 3, the weight portion of the foam stabilizer is 1 to 3, the weight portion of the foaming agent is 1 to 15, and the weight portion of the flame retardant is 5 to 15;

3) adding the mixture obtained in the step 2) into a polyol storage tank of a polyurethane foaming machine, and adding isocyanate into an isocyanate storage tank of the polyurethane foaming machine; 43-50 parts of isocyanate;

4) uniformly spreading a single-layer or multi-layer continuous glass fiber felt with a proper size in a metal die;

5) uniformly mixing the mixture in the polyol storage tank with isocyanate in the isocyanate storage tank at a high speed; then pouring into the metal mold in the step 4);

6) and after the foaming body in the metal mold is reacted, namely the foaming body is solidified and naturally and completely cooled, demolding to obtain the continuous glass fiber reinforced hard polyurethane foaming plastic with two-dimensional orientation.

2. The method for continuously preparing the rigid polyurethane foam with two-dimensional orientation and continuous glass fiber reinforcement comprises the following steps:

1) uniformly mixing polyols with different hydroxyl values; the polyester polyol comprises a mixture of 40-55 parts by weight of polyether polyol and polyester polyol; the mixing proportion is adjusted according to the performance requirements of the materials;

2) adding a foaming agent, a catalyst, a foam stabilizer and a flame retardant into the mixture obtained in the step 1), and uniformly mixing; wherein, the weight portion of the catalyst is 1 to 3, the weight portion of the foam stabilizer is 1 to 3, the weight portion of the foaming agent is 1 to 15, and the weight portion of the flame retardant is 5 to 15;

3) adding the mixture obtained in the step 2) into a polyol storage tank of a polyurethane foaming machine, and adding isocyanate into an isocyanate storage tank of the polyurethane foaming machine; 43-50 parts of isocyanate;

4) uniformly spreading a single-layer or multi-layer continuous glass fiber mat on a lower-layer track of a double-layer track type foaming production line by a mat spreading device;

5) simultaneously uniformly mixing the mixture in the polyol storage tank and isocyanate in the isocyanate storage tank at a high speed, and continuously pouring the mixture onto the single-layer or multi-layer continuous glass fiber mat obtained in the step 4);

6) and controlling the advancing speed of the track line to ensure that the speed of the foaming slurry permeating into the glass fiber layer is balanced with the foaming speed of the foam body. And foaming, growing and curing the polyurethane slurry between the double-layer tracks. And cooling the continuous glass fiber reinforced rigid polyurethane foam leaving the double-layer track line, and cutting the cooled continuous glass fiber reinforced rigid polyurethane foam into required sizes by a cutting machine to obtain the continuous glass fiber reinforced rigid polyurethane foam with two-dimensional orientation.

Example 1: preparation of continuous glass fiber reinforced rigid polyurethane foam with two-dimensional orientation in batch mode

The weight portion ratio of each component is as follows:

the component A comprises: polyether polyol 6305 with a hydroxyl value of 500mgKOH/g, 35 parts; 403, 5 portions of hydroxyl value of 760 mgKOH/g; 1 part of triethylene diamine catalyst; AK8807 organosilicon foam stabilizer 1 part; 4 parts of 1,1,1,3, 3-pentafluorobutane foaming agent (HFC-365), 1 part of water (serving as the foaming agent) and 5 parts of dimethyl methylphosphonate (DMMP) flame retardant.

And B component: 50 parts of polymethylene polyphenyl polyisocyanate.

The preparation method of the batch two-dimensional oriented continuous glass fiber reinforced hard polyurethane foam plastic comprises the following steps:

1) uniformly mixing the components in the A;

2) adding the mixture obtained in the step 1) into a polyol storage tank (A storage tank) of a polyurethane foaming machine, and adding polymethylene polyphenyl polyisocyanate into an isocyanate storage tank (B storage tank) of the polyurethane foaming machine;

3) uniformly spreading 2 layers of continuous glass fiber felt with the unit area weight of 100 grams in an iron mould;

4) uniformly mixing the mixture in the storage tank A with polymethylene polyphenyl polyisocyanate in the storage tank B at a high speed (more than 6000 r/min); then pouring the mixture into the iron mold in the step 3);

5) and after the foaming reaction is finished, solidifying the foaming body in the iron mould, naturally and completely cooling, demoulding, standing at room temperature for 3 days, and cutting off the surface skin on a cutting machine to obtain the two-dimensional oriented continuous glass fiber reinforced hard polyurethane foam plastic.

The properties of the continuous glass fiber reinforced rigid polyurethane foam prepared by the example method and having two-dimensional orientation are as follows: the density was 120kg/m³The vertical compression strength is 2.78MPa, the transverse compression strength is 2.72MPa, the room temperature thermal conductivity is 0.0252W/m.K, and the linear dimensional change rate is 42 multiplied by 10 in the vertical direction (25 ℃ to-196 ℃)^-6The transverse direction is (25 ℃ to-196 ℃)25 multiplied by 10^-6The flame retardancy is self-extinguishing from fire.

EXAMPLE 2 continuous preparation of continuous glass fiber reinforced rigid polyurethane foam with two-dimensional orientation

The proportion of each component of the polyurethane slurry is as follows:

the component A comprises: 35 parts of polyether polyol NJ-8243 (with a hydroxyl value of 425 mgKOH/g), 20 parts of polyether polyol NJ-6216 (with a hydroxyl value of 540 mgKOH/g), 3 parts of triethylene diamine catalyst, 3 parts of AK-8803 silicone foam stabilizer, 15 parts of 1,1,1,3, 3-pentafluorobutane foaming agent (HFC-365) and 15 parts of dimethyl methylphosphonate (DMMP) flame retardant;

and B component: 45 parts of polymethylene polyphenyl polyisocyanate;

the preparation method of the continuous glass fiber reinforced hard polyurethane foam plastic with continuous two-dimensional orientation comprises the following steps:

1) uniformly mixing the component A;

2) adding the mixture obtained in the step 1) into a polyol storage tank (A storage tank) of a polyurethane foaming machine, and adding polymethylene polyphenyl polyisocyanate into an isocyanate storage tank (B storage tank) of the polyurethane foaming machine;

3) starting the double-layer track line, and uniformly mixing the mixture in the storage tank A and the polymethylene polyphenyl polyisocyanate in the storage tank B at a high speed (more than 8000 revolutions per minute) when 3 layers of continuous glass fiber mats enter a material injection position of the track line; and then continuously cast onto a continuous glass fiber mat spread on a caterpillar line.

4) And foaming, growing and curing the polyurethane slurry between the double-layer tracks. And cooling the continuous glass fiber reinforced rigid polyurethane foam leaving the double-layer track line, and cutting the cooled continuous glass fiber reinforced rigid polyurethane foam into required sizes by a cutting machine to obtain the continuous glass fiber reinforced rigid polyurethane foam with two-dimensional orientation.

EXAMPLE 3 continuous preparation of continuous glass fiber reinforced rigid polyurethane foam with two-dimensional orientation

The proportion of each component of the polyurethane slurry is as follows:

the component A comprises: 20 parts of polyether polyol NJ-8243 (with the hydroxyl value of 425 mgKOH/g), 10 parts of polyester polyol 3152 (with the hydroxyl value of 315 mgKOH/g), 13 parts of polyether polyol NJ-6216 (with the hydroxyl value of 540 mgKOH/g), 2 parts of triethylene diamine catalyst, 2.5 parts of AK-8803 silicone foam stabilizer, 1 part of water (serving as a foaming agent) and 10 parts of dimethyl methylphosphonate (DMMP) flame retardant;

and B component: 43 parts of polymethylene polyphenyl polyisocyanate;

the preparation method of the continuous glass fiber reinforced hard polyurethane foam plastic with continuous two-dimensional orientation comprises the following steps:

1) uniformly mixing the component A;

2) adding the mixture obtained in the step 1) into a polyol storage tank (A storage tank) of a polyurethane foaming machine, and adding polymethylene polyphenyl polyisocyanate into an isocyanate storage tank (B storage tank) of the polyurethane foaming machine;

3) starting the double-layer track line, and uniformly mixing the mixture in the storage tank A and the polymethylene polyphenyl polyisocyanate in the storage tank B at a high speed (more than 8000 revolutions per minute) when 3 layers of continuous glass fiber mats enter a material injection position of the track line; and then continuously cast onto a continuous glass fiber mat spread on a caterpillar line.

4) And foaming, growing and curing the polyurethane slurry between the double-layer tracks. And cooling the continuous glass fiber reinforced rigid polyurethane foam leaving the double-layer track line, and cutting the cooled continuous glass fiber reinforced rigid polyurethane foam into required sizes by a cutting machine to obtain the continuous glass fiber reinforced rigid polyurethane foam with two-dimensional orientation.

The above-described embodiments are intended to illustrate rather than to limit the invention, and any modifications and variations of the present invention are within the spirit of the invention and the scope of the appended claims.